品牌是'Atmel' (32)

对比

图片

产品型号

品牌

数据表

库存

价格(含增值税)

数量

Rohs

表面安装

材料

Housing material

终端数量

Body diameter

Characteristics

Clamp type

Colour

Dielectric strength

Gross weight

Head and button shape

Heatsink shape

Heatsinks features

Illuation color

Illumination voltage

Indicator type

LED lifespan

Material finishing

Mounting diameter

Mounting hole size

Mounting method

Noal voltage

Number of switching cycles (electrical)

Plate thickness

Purpose

Relative humidity

Switching scheme

Transport packaging size/quantity

Type of heatsink

JESD-609代码

无铅代码

ECCN 代码

Connector type

类型

端子表面处理

附加功能

HTS代码

端子位置

终端形式

峰值回流焊温度(摄氏度)

功能数量

端子间距

深度

Reach合规守则

时间@峰值回流温度-最大值(s)

引脚数量

JESD-30代码

资历状况

电源电压-最大值(Vsup)

Contact resistance

温度等级

电源电压-最小值(Vsup)

Insulation resistance

操作模式

电源电流-最大值

Switch type

组织结构

输出特性

座位高度-最大

内存宽度

Operating temperature range

待机电流-最大值

Rated current

记忆密度

并行/串行

I/O类型

内存IC类型

编程电压

串行总线类型

耐力

写入周期时间 - 最大值

数据保持时间

写入保护

备用内存宽度

数据轮询

拨动位

命令用户界面

扇区/尺寸数

行业规模

页面尺寸

准备就绪/忙碌

引导模块

第二个连接器加载的位置数

饱和电流

特征

触点

直径

高度

长度

宽度

AT27HC642R-45PC
AT27HC642R-45PC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

NO

24

RECTANGULAR

DIP24,.3

DIP

PLASTIC/EPOXY

70 °C

8000

8192 words

45 ns

DIP, DIP24,.3

DIP

ATMEL CORP

Obsolete

无

5 V

IN-LINE

e0

无

EAR99

锡铅

8542.32.00.71

DUAL

THROUGH-HOLE

1

2.54 mm

compliant

24

R-PDIP-T24

不合格

5.5 V

COMMERCIAL

4.5 V

ASYNCHRONOUS

0.045 mA

8KX8

3-STATE

5.08 mm

8

0.025 A

65536 bit

PARALLEL

COMMON

OTP ROM

32 mm

7.62 mm

AT25F4096Y4-10YH-2.7
AT25F4096Y4-10YH-2.7
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

8

ATMEL CORP

SOIC

VSON, SOLCC8,.25

33 MHz

524288 words

512000

85 °C

-40 °C

PLASTIC/EPOXY

VSON

SOLCC8,.25

RECTANGULAR

SMALL OUTLINE, VERY THIN PROFILE

3 V

有

Obsolete

e4

EAR99

NOR型号

Nickel/Palladium/Gold (Ni/Pd/Au)

8542.32.00.51

DUAL

无铅

未说明

1

1.27 mm

compliant

未说明

8

R-PDSO-N8

不合格

3.6 V

INDUSTRIAL

2.7 V

SYNCHRONOUS

0.045 mA

512KX8

0.9 mm

8

0.00001 A

4194304 bit

SERIAL

FLASH

2.7 V

SPI

10000 Write/Erase Cycles

20

HARDWARE/SOFTWARE

6 mm

4.9 mm

AT45DB321E-MHF-Y
AT45DB321E-MHF-Y
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

steel

8

clamp width H - 270 mm; clamp depth B - 100 mm

screw clamp

2485.00

ATMEL CORP

SON

5 X 6 MM, 0.60 MM HEIGHT, GREEN, PLASTIC, MO-229, UDFN-8

70 MHz

33554432 words

32000000

85 °C

-40 °C

PLASTIC/EPOXY

HVSON

RECTANGULAR

SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE

3 V

G-shaped clamp 270 mm

有

Transferred

for wood and metal

42*28*18.5/10

e4

EAR99

NOR型号

镍钯金

8542.32.00.51

DUAL

无铅

260

1

1.27 mm

compliant

8

R-PDSO-N8

3.6 V

INDUSTRIAL

2.3 V

SYNCHRONOUS

32MX1

0.6 mm

1

33554432 bit

SERIAL

FLASH

2.7 V

1

body with stiffening ribs

6 mm

5 mm

AT49HF010-55TI
AT49HF010-55TI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

32

128000

85 °C

-40 °C

PLASTIC/EPOXY

TSOP1

TSSOP32,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

3

55 ns

PLASTIC, MO-142BD, TSOP-32

TSOP1

ATMEL CORP

Obsolete

无

131072 words

e0

EAR99

NOR型号

锡铅

HARDWARE DATA PROTECTION; BYTE PROGRAMMABLE

8542.32.00.51

DUAL

鸥翼

240

1

0.5 mm

compliant

32

R-PDSO-G32

不合格

5.5 V

INDUSTRIAL

4.5 V

ASYNCHRONOUS

0.09 mA

128KX8

1.2 mm

8

0.0003 A

1048576 bit

PARALLEL

FLASH

5 V

YES

YES

YES

1,1

8K,120K

BOTTOM

18.4 mm

8 mm

AT49BV8192-12TC
AT49BV8192-12TC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

48

ATMEL CORP

TSOP

TSOP1, TSSOP48,.8,20

120 ns

524288 words

512000

70 °C

PLASTIC/EPOXY

TSOP1

TSSOP48,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

3 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

HARDWARE DATA PROTECTION; 10000 WRITE CYCLES

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

compliant

48

R-PDSO-G48

不合格

3.6 V

COMMERCIAL

2.7 V

ASYNCHRONOUS

0.05 mA

512KX16

1.2 mm

16

0.00005 A

8388608 bit

PARALLEL

FLASH

3 V

YES

YES

YES

3,1

8K,488K

BOTTOM

18.4 mm

12 mm

AT49F080-12TI
AT49F080-12TI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

40

Obsolete

ATMEL CORP

TSOP

PLASTIC, TSOP-40

120 ns

3

1048576 words

1000000

85 °C

-40 °C

PLASTIC/EPOXY

TSOP1

TSSOP40,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

无

e0

EAR99

NOR型号

锡铅

HARDWARE DATA PROTECTION; BYTE PROGRAMMABLE

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

compliant

40

R-PDSO-G40

不合格

5.5 V

INDUSTRIAL

4.5 V

ASYNCHRONOUS

0.09 mA

1MX8

1.2 mm

8

0.0003 A

8388608 bit

PARALLEL

FLASH

5 V

YES

YES

YES

1,1

16K,1008K

YES

BOTTOM

18.4 mm

10 mm

AT49F8192T-90TC
AT49F8192T-90TC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

48

ATMEL CORP

TSOP1

TSOP1, TSSOP48,.8,20

90 ns

3

524288 words

512000

70 °C

PLASTIC/EPOXY

TSOP1

TSSOP48,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

compliant

48

R-PDSO-G48

不合格

5.5 V

COMMERCIAL

4.5 V

ASYNCHRONOUS

0.09 mA

512KX16

1.2 mm

16

0.0003 A

8388608 bit

PARALLEL

FLASH

5 V

YES

YES

YES

3,1

8K,488K

TOP

18.4 mm

12 mm

AT49LV8192AT-70TC
AT49LV8192AT-70TC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

48

ATMEL CORP

TSOP1

12 X 20 MM, PLASTIC, TSOP1-48

70 ns

524288 words

512000

70 °C

PLASTIC/EPOXY

TSOP1

TSSOP48,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

3.3 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

unknown

48

R-PDSO-G48

不合格

3.6 V

COMMERCIAL

3 V

ASYNCHRONOUS

0.025 mA

512KX16

1.2 mm

16

0.00005 A

8388608 bit

PARALLEL

FLASH

3 V

8

YES

YES

YES

1,2,1

16K,8K,992K

TOP

18.4 mm

12 mm

AT45D041-TI
AT45D041-TI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

28

Obsolete

ATMEL CORP

TSOP

TSOP1, TSSOP28,.53,22

10 MHz

3

540672 words

528000

85 °C

-40 °C

PLASTIC/EPOXY

TSOP1

TSSOP28,.53,22

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

无

e0

EAR99

NOR型号

锡铅

8542.32.00.51

DUAL

鸥翼

240

1

0.55 mm

unknown

28

R-PDSO-G28

不合格

5.5 V

INDUSTRIAL

4.5 V

SYNCHRONOUS

0.05 mA

528KX8

1.2 mm

8

0.00004 A

4325376 bit

SERIAL

FLASH

5 V

SPI

HARDWARE

11.8 mm

8 mm

AT49F8192T-12TC
AT49F8192T-12TC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

48

ATMEL CORP

TSOP1

PLASTIC, MO-142DD, TSOP1-48

120 ns

524288 words

512000

70 °C

PLASTIC/EPOXY

TSOP1

TSSOP48,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

compliant

48

R-PDSO-G48

不合格

5.5 V

COMMERCIAL

4.5 V

ASYNCHRONOUS

0.09 mA

512KX16

1.2 mm

16

0.0003 A

8388608 bit

PARALLEL

FLASH

5 V

YES

YES

YES

3,1

8K,488K

TOP

18.4 mm

12 mm

AT25F512Y4-10YI-2.7
AT25F512Y4-10YI-2.7
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

8

ATMEL CORP

HVSON, SOLCC8,.25

20 MHz

3

65536 words

64000

85 °C

-40 °C

PLASTIC/EPOXY

HVSON

SOLCC8,.25

RECTANGULAR

SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE

3 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

8542.32.00.51

DUAL

无铅

240

1

1.27 mm

unknown

R-PDSO-N8

不合格

3.6 V

INDUSTRIAL

2.7 V

SYNCHRONOUS

0.03 mA

64KX8

0.9 mm

8

0.00001 A

524288 bit

SERIAL

FLASH

2.7 V

SPI

10000 Write/Erase Cycles

HARDWARE/SOFTWARE

6 mm

4.9 mm

AT29C512-12TU
AT29C512-12TU
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

32

ATMEL CORP

TSOP1

8 X 20 MM, PLASTIC, MO-142BD, TSOP1-32

120 ns

3

65536 words

64000

85 °C

-40 °C

PLASTIC/EPOXY

TSOP1

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

有

Obsolete

e3

EAR99

NOR型号

哑光锡

AUTOMATIC WRITE; HARDWARE & SOFTWARE DATA PROTECTION

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

compliant

32

R-PDSO-G32

不合格

5.5 V

INDUSTRIAL

4.5 V

ASYNCHRONOUS

64KX8

3-STATE

1.2 mm

8

524288 bit

PARALLEL

FLASH

5 V

10 ms

18.4 mm

8 mm

AT49F8011-90TI
AT49F8011-90TI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

48

ATMEL CORP

TSOP1

TSOP1, TSSOP48,.8,20

90 ns

524288 words

512000

85 °C

-40 °C

PLASTIC/EPOXY

TSOP1

TSSOP48,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

CONFIGURABLE AS 512K X 16

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

unknown

48

R-PDSO-G48

不合格

5.5 V

INDUSTRIAL

4.5 V

ASYNCHRONOUS

0.06 mA

512KX16

1.2 mm

16

0.00001 A

8388608 bit

PARALLEL

FLASH

5 V

8

YES

YES

YES

2,4,2,14

16K,8K,32K,64K

YES

BOTTOM

18.4 mm

12 mm

AT29C010A-15TU
AT29C010A-15TU
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

32

ATMEL CORP

TSOP1

8 X 20 MM, PLASTIC, MO-142BD, TSOP1-32

150 ns

3

131072 words

128000

85 °C

-40 °C

PLASTIC/EPOXY

TSOP1

RECTANGULAR

SMALL OUTLINE, THIN PROFILE

5 V

有

Obsolete

e3

EAR99

NOR型号

哑光锡

8542.32.00.51

DUAL

鸥翼

1

0.5 mm

compliant

32

R-PDSO-G32

不合格

5.5 V

INDUSTRIAL

4.5 V

ASYNCHRONOUS

128KX8

3-STATE

1.2 mm

8

1048576 bit

PARALLEL

FLASH

5 V

10 ms

18.4 mm

8 mm

AT27C800-15JC
AT27C800-15JC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

44

ATMEL CORP

LCC

QCCJ, LDCC44,.7SQ

150 ns

2

524288 words

512000

70 °C

PLASTIC/EPOXY

QCCJ

LDCC44,.7SQ

SQUARE

CHIP CARRIER

5 V

无

Obsolete

e0

EAR99

锡铅

CONFIGURABLE AS 512K X 16; TTL COMPATIBLE I/O

8542.32.00.71

QUAD

J BEND

225

1

1.27 mm

compliant

44

S-PQCC-J44

不合格

5.5 V

COMMERCIAL

4.5 V

ASYNCHRONOUS

0.05 mA

512KX16

3-STATE

4.57 mm

16

0.0001 A

8388608 bit

PARALLEL

COMMON

OTP ROM

8

16.5862 mm

16.5862 mm

AT29C010-90PI
AT29C010-90PI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

NO

32

ATMEL CORP

DIP

0.600 INCH, PLASTIC, DIP-32

128000

85 °C

-40 °C

PLASTIC/EPOXY

DIP

DIP32,.6

RECTANGULAR

IN-LINE

5 V

131072 words

90 ns

无

Obsolete

e0

无

EAR99

NOR型号

锡铅

AUTOMATIC WRITE; HARDWARE & SOFTWARE DATA PROTECTION

8542.32.00.51

DUAL

THROUGH-HOLE

1

2.54 mm

compliant

32

R-PDIP-T32

不合格

5.5 V

INDUSTRIAL

4.5 V

ASYNCHRONOUS

0.05 mA

128KX8

3-STATE

5.59 mm

8

0.0003 A

1048576 bit

PARALLEL

FLASH

5 V

YES

YES

NO

1K

128

42.05 mm

15.24 mm

AT27LV512R-20RC
AT27LV512R-20RC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

28

ATMEL CORP

SOIC

SOP, SOP28,.5

200 ns

2

65536 words

64000

70 °C

PLASTIC/EPOXY

SOP

SOP28,.5

RECTANGULAR

小概要

5 V

无

Obsolete

e0

无

EAR99

锡铅

8542.32.00.71

DUAL

鸥翼

225

1

1.27 mm

compliant

28

R-PDSO-G28

不合格

5.5 V

COMMERCIAL

3 V

ASYNCHRONOUS

0.02 mA

64KX8

3-STATE

2.79 mm

8

0.00002 A

524288 bit

PARALLEL

COMMON

OTP ROM

18.25 mm

8.74 mm

AT45DB021E-SHN2B-T
AT45DB021E-SHN2B-T
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

aluminium

8

8 mm

black

700 g

grilled

hollow fin geometry

ATMEL CORP

anodized

SOIC

0.208 INCH, GREEN, PLASTIC, SOIC-8

70 MHz

Ф6 mm

panel mount/ solder

2097152 words

30 (AC/ DC) Vmin

2000000

85 °C

-40 °C

PLASTIC/EPOXY

SOP

RECTANGULAR

小概要

1.8 V

for back plate

10 A

20mm

Transferred

28.5*21*19/1000

extruded

e4

EAR99

socket (F) Ф2 mm, isolator color - red

镍钯金

8542.32.00.51

DUAL

鸥翼

1

1.27 mm

24.5 mm

compliant

8

R-PDSO-G8

3.6 V

INDUSTRIAL

1.65 V

SYNCHRONOUS

2MX1

2.16 mm

1

2097152 bit

SERIAL

FLASH

2.7 V

for fan motors

23mm

0.3m

112mm

AT45DB021E-SSHN-T
AT45DB021E-SSHN-T
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

8

SOIC

0.150 INCH, GREEN, PLASTIC, MS-012AA, SOIC-8

70 MHz

2097152 words

2000000

85 °C

-40 °C

PLASTIC/EPOXY

SOP

RECTANGULAR

小概要

1.8 V

Transferred

ATMEL CORP

e4

EAR99

NOR型号

镍钯金

8542.32.00.51

DUAL

鸥翼

1

1.27 mm

compliant

8

R-PDSO-G8

3.6 V

INDUSTRIAL

1.65 V

SYNCHRONOUS

2MX1

1.75 mm

1

2097152 bit

SERIAL

FLASH

2.7 V

4.925 mm

3.9 mm

AT45DB041E-SSHN-T
AT45DB041E-SSHN-T
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

8

ATMEL CORP

SOIC

0.150 INCH, GREEN, PLASTIC, MS-012AA, SOIC-8

70 MHz

4194304 words

4000000

85 °C

-40 °C

PLASTIC/EPOXY

SOP

SOP8,.25

RECTANGULAR

小概要

3 V

有

Transferred

e4

EAR99

NOR型号

镍钯金

8542.32.00.51

DUAL

鸥翼

1

1.27 mm

compliant

8

R-PDSO-G8

不合格

3.6 V

INDUSTRIAL

1.65 V

SYNCHRONOUS

0.026 mA

4MX1

1.75 mm

1

0.00001 A

4194304 bit

SERIAL

FLASH

2.7 V

SPI

100000 Write/Erase Cycles

20

HARDWARE/SOFTWARE

4.925 mm

3.9 mm

AT45DB021E-SHN-T
AT45DB021E-SHN-T
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

nickel-plated brass

8

2000 (50 Hz / 5 s) V

21.20

ring - cone; flat button

Transferred

greemin

12 V

"ON" pictogram

≥40000 hours

ATMEL CORP

SOIC

0.208 INCH, GREEN, PLASTIC, EIAJ, SOIC-8

19 mm

70 MHz

2097152 words

≥50000

2000000

85 °C

-40 °C

PLASTIC/EPOXY

SOP

RECTANGULAR

小概要

1.8 V

IP65

250 V

45...85 %

有

ON-(ON) without locking

27.5*27*19/100

e4

EAR99

NOR型号

镍钯金

8542.32.00.51

DUAL

鸥翼

1

1.27 mm

compliant

8

R-PDSO-G8

3.6 V

≤50 mΩ

INDUSTRIAL

1.65 V

≥1000 MΩ

SYNCHRONOUS

Vandal resistant pushbutton switch LAS1-AGQ series with illumination

2MX1

2.16 mm

1

-25…+55 °C

5 A

2097152 bit

SERIAL

FLASH

2.7 V

3Pin+2Pin

22 mm

5.29 mm

5.24 mm

AT49LV2048A-90TI
AT49LV2048A-90TI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

,

无

Obsolete

ATMEL CORP

EAR99

8542.32.00.51

unknown

AT27LV512R-25RI
AT27LV512R-25RI
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

28

Obsolete

ATMEL CORP

SOIC

SOP, SOP28,.5

250 ns

2

65536 words

64000

85 °C

-40 °C

PLASTIC/EPOXY

SOP

SOP28,.5

RECTANGULAR

小概要

5 V

无

e0

无

EAR99

锡铅

8542.32.00.71

DUAL

鸥翼

225

1

1.27 mm

compliant

28

R-PDSO-G28

不合格

5.5 V

INDUSTRIAL

3 V

ASYNCHRONOUS

0.025 mA

64KX8

3-STATE

2.79 mm

8

0.00002 A

524288 bit

PARALLEL

COMMON

OTP ROM

18.25 mm

8.74 mm

AT27C256-25JC
AT27C256-25JC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

32

ATMEL CORP

QCCJ, LDCC32,.5X.6

250 ns

2

32768 words

32000

70 °C

PLASTIC/EPOXY

QCCJ

LDCC32,.5X.6

RECTANGULAR

CHIP CARRIER

5 V

无

Transferred

e0

EAR99

锡铅

8542.32.00.71

QUAD

J BEND

225

1

1.27 mm

compliant

R-PQCC-J32

不合格

5.5 V

COMMERCIAL

4.5 V

ASYNCHRONOUS

0.03 mA

32KX8

3-STATE

8

0.0001 A

262144 bit

PARALLEL

COMMON

12.5 V

AT29BV040A-20TC
AT29BV040A-20TC
Atmel Corporation 数据表

N/A

-

最小起订量: 1

最小包装量: 1

YES

32

ATMEL CORP

TSOP1

8 X 20 MM, PLASTIC, MO-142BD, TSOP1-32

200 ns

3

524288 words

512000

70 °C

PLASTIC/EPOXY

TSSOP

TSSOP32,.8,20

RECTANGULAR

SMALL OUTLINE, THIN PROFILE, SHRINK PITCH

3 V

无

Obsolete

e0

EAR99

NOR型号

锡铅

8542.32.00.51

DUAL

鸥翼

240

1

0.5 mm

compliant

32

R-PDSO-G32

不合格

3.6 V

COMMERCIAL

2.7 V

ASYNCHRONOUS

0.015 mA

512KX8

1.2 mm

8

0.00004 A

4194304 bit

PARALLEL

FLASH

2.7 V

10000 Write/Erase Cycles

20 ms

YES

YES

NO

2K

256

256 words

BOTTOM/TOP

18.4 mm

8 mm