component
AT24C128C-XHM-B
Public Made by Adomby adom
Microchip Tech Pre-ordered Chips, TSSOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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AT24C128C-XHM-B
Microchip Tech · Pre-ordered Chips · TSSOP-8
AT24C128C-XHM-B from Microchip Tech, in a TSSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A0 | input | Device address input hard-wired to GND or VCC; if left floating it is internally pulled down, and Microchip recommends connecting it to a known state with any pull-up resistor of 10 kΩ or less. |
| 2 | A1 | input | Device address input hard-wired to GND or VCC for multi-device addressing (up to eight devices on one bus); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less. |
| 3 | A2 | input | Device address input hard-wired to GND or VCC for multi-device addressing (up to eight devices on one bus); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less. |
| 4 | GND | power_in | Ground reference for the power supply, to be connected to the system ground. |
| 5 | SDA | bidirectional | Open-drain bidirectional serial data pin that must be pulled high with an external pull-up resistor not exceeding 10 kΩ and may be wire-ORed with other open-drain devices. |
| 6 | SCL | input | Serial clock input: SDA data is latched on the rising edge of SCL and clocked out on the falling edge, and SCL must be held high when the bus is idle or pulled high with an external resistor. |
| 7 | WP | input | Write-protect input: connecting it to GND allows normal writes, while connecting it to VCC inhibits writes to the protected memory (full array); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less. |
| 8 | VCC | power_in | Device power supply pin; operation at invalid VCC voltages may produce spurious results (Grade 1: 2.5 V to 5.5 V, Grade 3: 1.7 V to 5.5 V per page 1). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TSSOP-8 |
| Category | Interface ICs |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Temperature (Case) | -40 | 125 | °C | Automotive Grade 1 | 9 | ||
| Operating Temperature (Case) | -40 | 85 | °C | Automotive Grade 3 | 9 | ||
| VCC Power Supply | 2.5 | 5.5 | V | Grade 1 | 9 | ||
| VCC Power Supply | 1.7 | 5.5 | V | Grade 3 | 9 | ||
| Temperature under bias | -55 | 125 | °C | 9 | |||
| Storage temperature | -65 | 150 | °C | 9 | |||
| VCC supply voltage (absolute maximum) | VCC | 6.25 | V | 9 | |||
| Voltage on any pin with respect to ground | -1 | 7 | V | 9 | |||
| DC output current | 5 | mA | 9 | ||||
| Time required after VCC is stable before the device can accept commands | tPUP | 100 | µs | 11 | |||
| Minimum time at VCC = 0V between power cycles | tPOFF | 500 | ms | 11 | |||
| Power-on Reset Threshold Voltage | VPOR | 1.5 | V | 11 | |||
| Supply Voltage | VCC1 | 2.5 | 5.5 | V | Grade 1 | 9 | |
| Supply Voltage | VCC2 | 1.7 | 5.5 | V | Grade 3 | 9 | |
| Supply Current (read) | ICC1 | 0.4 | 1 | mA | VCC = 5.0V, Read at 400 kHz | 9 | |
| Supply Current (write) | ICC2 | 2 | 3 | mA | VCC = 5.0V, Write at 400 kHz | 9 | |
| Standby Current | ISB | 0.1 | 3 | μA | VCC = 1.7V, VIN = VCC or GND | 9 | |
| Standby Current | ISB | 1.6 | 4 | μA | VCC = 2.5V, VIN = VCC or GND | 9 | |
| Standby Current | ISB | 4 | 6 | μA | VCC = 5.0V, VIN = VCC or GND | 9 | |
| Input Leakage Current | ILI | 0.1 | 3 | μA | VIN = VCC or GND | 9 | |
| Output Leakage Current | ILO | 0.05 | 3 | μA | VOUT = VCC or GND | 10 | |
| Input Low Level (min as printed) | VIL | -0.6 | V | Note 2 | 10 | ||
| Input Low Level (max as printed: VCC x 0.3; value 0.3 in x VCC) | VIL | 0.3 | x VCC | Note 2 | 10 | ||
| Input High Level (min as printed: VCC x 0.7; value 0.7 in x VCC) | VIH | 0.7 | x VCC | Note 2 | 10 | ||
| Input High Level (max as printed: VCC + 0.5; value 0.5 added to VCC) | VIH | 0.5 | V (added to VCC) | Note 2 | 10 | ||
| Output Low Level | VOL1 | 0.2 | V | VCC = 1.7V, IOL = 0.15 mA | 10 | ||
| Output Low Level | VOL2 | 0.4 | V | VCC = 2.5V, IOL = 2.1 mA | 10 | ||
| Input/Output Capacitance (SDA) | CI/O | 8 | pF | VI/O = 0V | 12 | ||
| Input Capacitance (A0, A1, A2 and SCL) | CIN | 6 | pF | VIN = 0V | 12 | ||
| Write Endurance | 1e+06 | Write Cycles | TA = 25°C, VCC = 5.0V, Page Write mode | 12 | |||
| Data Retention | 100 | Years | TA = 55°C | 12 | |||
| Clock Frequency, SCL | fSCL | 100 | kHz | Column pair 1 (100 kHz column) | 10 | ||
| Clock Frequency, SCL | fSCL | 400 | kHz | Column pair 2 (400 kHz column) | 10 | ||
| Clock Pulse Width Low | tLOW | 4700 | ns | Column pair 1 | 10 | ||
| Clock Pulse Width Low | tLOW | 1200 | ns | Column pair 2 | 10 | ||
| Clock Pulse Width High | tHIGH | 4000 | ns | Column pair 1 | 10 | ||
| Clock Pulse Width High | tHIGH | 600 | ns | Column pair 2 | 10 | ||
| Noise Suppression Time | tI | 100 | ns | Column pair 1 | 10 | ||
| Noise Suppression Time | tI | 50 | ns | Column pair 2 | 10 | ||
| Clock Low to Data Out Valid | tAA | 4500 | ns | Column pair 1 | 10 | ||
| Clock Low to Data Out Valid | tAA | 100 | 900 | ns | Column pair 2 | 10 | |
| Bus Free Time between Stop and Start | tBUF | 4700 | ns | Column pair 1 | 10 | ||
| Bus Free Time between Stop and Start | tBUF | 1200 | ns | Column pair 2 | 10 | ||
| Start Hold Time | tHD.STA | 4000 | ns | Column pair 1 | 10 | ||
| Start Hold Time | tHD.STA | 600 | ns | Column pair 2 | 10 | ||
| Start Set-Up Time | tSU.STA | 4700 | ns | Column pair 1 | 10 | ||
| Start Set-Up Time | tSU.STA | 600 | ns | Column pair 2 | 10 | ||
| Data In Hold Time | tHD.DAT | 0 | ns | Column pair 1 | 10 | ||
| Data In Set-up Time | tSU.DAT | 200 | ns | Column pair 1 | 10 | ||
| Data In Set-up Time | tSU.DAT | 100 | ns | Column pair 2 | 10 | ||
| Inputs Rise Time | tR | 1000 | ns | Column pair 1 | 10 | ||
| Inputs Rise Time | tR | 300 | ns | Column pair 2 | 10 | ||
| Inputs Fall Time | tF | 300 | ns | Column pair 1 | 10 | ||
| Stop Set-Up Time | tSU.STO | 4700 | ns | Column pair 1 | 10 | ||
| Stop Set-Up Time | tSU.STO | 600 | ns | Column pair 2 | 10 | ||
| Data Out Hold Time | tDH | 100 | ns | Column pair 1 | 10 | ||
| Data Out Hold Time | tDH | 50 | ns | Column pair 2 | 10 | ||
| Write Cycle Time | tWR | 5 | ms | Column pair 1 | 10 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | 8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] © 2020 Microchip Technology Inc. | 25 |
CAD (KiCad official)
- Symbol:
AT24C128C-XHM-B - Footprint:
Package_SO:TSSOP-8_4.4x3mm_P0.65mm - 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files:
at24c128c-xhm-b-etched.step/at24c128c-xhm-b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);at24c128c-xhm-b.step/at24c128c-xhm-b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (38 pp, sha256
246bfb745ffa84e6, retrieved 2026-11-05, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).
# AT24C128C-XHM-B
**Microchip Tech** · Pre-ordered Chips · TSSOP-8
AT24C128C-XHM-B from Microchip Tech, in a TSSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A0 | input | Device address input hard-wired to GND or VCC; if left floating it is internally pulled down, and Microchip recommends connecting it to a known state with any pull-up resistor of 10 kΩ or less. |
| 2 | A1 | input | Device address input hard-wired to GND or VCC for multi-device addressing (up to eight devices on one bus); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less. |
| 3 | A2 | input | Device address input hard-wired to GND or VCC for multi-device addressing (up to eight devices on one bus); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less. |
| 4 | GND | power_in | Ground reference for the power supply, to be connected to the system ground. |
| 5 | SDA | bidirectional | Open-drain bidirectional serial data pin that must be pulled high with an external pull-up resistor not exceeding 10 kΩ and may be wire-ORed with other open-drain devices. |
| 6 | SCL | input | Serial clock input: SDA data is latched on the rising edge of SCL and clocked out on the falling edge, and SCL must be held high when the bus is idle or pulled high with an external resistor. |
| 7 | WP | input | Write-protect input: connecting it to GND allows normal writes, while connecting it to VCC inhibits writes to the protected memory (full array); if left floating it is internally pulled down, and Microchip recommends a known state with any pull-up resistor of 10 kΩ or less. |
| 8 | VCC | power_in | Device power supply pin; operation at invalid VCC voltages may produce spurious results (Grade 1: 2.5 V to 5.5 V, Grade 3: 1.7 V to 5.5 V per page 1). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TSSOP-8 |
| Category | Interface ICs |
| Pins | 8 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Temperature (Case) | | -40 | | 125 | °C | Automotive Grade 1 | 9 |
| Operating Temperature (Case) | | -40 | | 85 | °C | Automotive Grade 3 | 9 |
| VCC Power Supply | | 2.5 | | 5.5 | V | Grade 1 | 9 |
| VCC Power Supply | | 1.7 | | 5.5 | V | Grade 3 | 9 |
| Temperature under bias | | -55 | | 125 | °C | | 9 |
| Storage temperature | | -65 | | 150 | °C | | 9 |
| VCC supply voltage (absolute maximum) | VCC | | | 6.25 | V | | 9 |
| Voltage on any pin with respect to ground | | -1 | | 7 | V | | 9 |
| DC output current | | | | 5 | mA | | 9 |
| Time required after VCC is stable before the device can accept commands | tPUP | 100 | | | µs | | 11 |
| Minimum time at VCC = 0V between power cycles | tPOFF | 500 | | | ms | | 11 |
| Power-on Reset Threshold Voltage | VPOR | | | 1.5 | V | | 11 |
| Supply Voltage | VCC1 | 2.5 | | 5.5 | V | Grade 1 | 9 |
| Supply Voltage | VCC2 | 1.7 | | 5.5 | V | Grade 3 | 9 |
| Supply Current (read) | ICC1 | | 0.4 | 1 | mA | VCC = 5.0V, Read at 400 kHz | 9 |
| Supply Current (write) | ICC2 | | 2 | 3 | mA | VCC = 5.0V, Write at 400 kHz | 9 |
| Standby Current | ISB | | 0.1 | 3 | μA | VCC = 1.7V, VIN = VCC or GND | 9 |
| Standby Current | ISB | | 1.6 | 4 | μA | VCC = 2.5V, VIN = VCC or GND | 9 |
| Standby Current | ISB | | 4 | 6 | μA | VCC = 5.0V, VIN = VCC or GND | 9 |
| Input Leakage Current | ILI | | 0.1 | 3 | μA | VIN = VCC or GND | 9 |
| Output Leakage Current | ILO | | 0.05 | 3 | μA | VOUT = VCC or GND | 10 |
| Input Low Level (min as printed) | VIL | -0.6 | | | V | Note 2 | 10 |
| Input Low Level (max as printed: VCC x 0.3; value 0.3 in x VCC) | VIL | | | 0.3 | x VCC | Note 2 | 10 |
| Input High Level (min as printed: VCC x 0.7; value 0.7 in x VCC) | VIH | 0.7 | | | x VCC | Note 2 | 10 |
| Input High Level (max as printed: VCC + 0.5; value 0.5 added to VCC) | VIH | | | 0.5 | V (added to VCC) | Note 2 | 10 |
| Output Low Level | VOL1 | | | 0.2 | V | VCC = 1.7V, IOL = 0.15 mA | 10 |
| Output Low Level | VOL2 | | | 0.4 | V | VCC = 2.5V, IOL = 2.1 mA | 10 |
| Input/Output Capacitance (SDA) | CI/O | | | 8 | pF | VI/O = 0V | 12 |
| Input Capacitance (A0, A1, A2 and SCL) | CIN | | | 6 | pF | VIN = 0V | 12 |
| Write Endurance | | 1e+06 | | | Write Cycles | TA = 25°C, VCC = 5.0V, Page Write mode | 12 |
| Data Retention | | 100 | | | Years | TA = 55°C | 12 |
| Clock Frequency, SCL | fSCL | | | 100 | kHz | Column pair 1 (100 kHz column) | 10 |
| Clock Frequency, SCL | fSCL | | | 400 | kHz | Column pair 2 (400 kHz column) | 10 |
| Clock Pulse Width Low | tLOW | 4700 | | | ns | Column pair 1 | 10 |
| Clock Pulse Width Low | tLOW | 1200 | | | ns | Column pair 2 | 10 |
| Clock Pulse Width High | tHIGH | 4000 | | | ns | Column pair 1 | 10 |
| Clock Pulse Width High | tHIGH | 600 | | | ns | Column pair 2 | 10 |
| Noise Suppression Time | tI | | | 100 | ns | Column pair 1 | 10 |
| Noise Suppression Time | tI | | | 50 | ns | Column pair 2 | 10 |
| Clock Low to Data Out Valid | tAA | | | 4500 | ns | Column pair 1 | 10 |
| Clock Low to Data Out Valid | tAA | 100 | | 900 | ns | Column pair 2 | 10 |
| Bus Free Time between Stop and Start | tBUF | 4700 | | | ns | Column pair 1 | 10 |
| Bus Free Time between Stop and Start | tBUF | 1200 | | | ns | Column pair 2 | 10 |
| Start Hold Time | tHD.STA | 4000 | | | ns | Column pair 1 | 10 |
| Start Hold Time | tHD.STA | 600 | | | ns | Column pair 2 | 10 |
| Start Set-Up Time | tSU.STA | 4700 | | | ns | Column pair 1 | 10 |
| Start Set-Up Time | tSU.STA | 600 | | | ns | Column pair 2 | 10 |
| Data In Hold Time | tHD.DAT | 0 | | | ns | Column pair 1 | 10 |
| Data In Set-up Time | tSU.DAT | 200 | | | ns | Column pair 1 | 10 |
| Data In Set-up Time | tSU.DAT | 100 | | | ns | Column pair 2 | 10 |
| Inputs Rise Time | tR | | | 1000 | ns | Column pair 1 | 10 |
| Inputs Rise Time | tR | | | 300 | ns | Column pair 2 | 10 |
| Inputs Fall Time | tF | | | 300 | ns | Column pair 1 | 10 |
| Stop Set-Up Time | tSU.STO | 4700 | | | ns | Column pair 1 | 10 |
| Stop Set-Up Time | tSU.STO | 600 | | | ns | Column pair 2 | 10 |
| Data Out Hold Time | tDH | 100 | | | ns | Column pair 1 | 10 |
| Data Out Hold Time | tDH | 50 | | | ns | Column pair 2 | 10 |
| Write Cycle Time | tWR | | | 5 | ms | Column pair 1 | 10 |
## Materials and finish
As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | | tin | 8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] © 2020 Microchip Technology Inc. | 25 |
## CAD (KiCad official)
- Symbol: `AT24C128C-XHM-B`
- Footprint: `Package_SO:TSSOP-8_4.4x3mm_P0.65mm`
- 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `at24c128c-xhm-b-etched.step` / `at24c128c-xhm-b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at24c128c-xhm-b.step` / `at24c128c-xhm-b.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Microchip Tech datasheet](docs/at24c128c-xhm-b-datasheet.pdf) (38 pp, sha256 `246bfb745ffa84e6`, retrieved 2026-11-05, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/at24c128c-xhm-b-datasheet.pdf)