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AT25640B-XHL-T

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Microchip Tech EEPROM, TSSOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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AT25640B-XHL-T

Microchip Tech · EEPROM · TSSOP-8

AT25640B-XHL-T 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 CS input Chip Select: the device is selected when CS is low, and SO stays high-impedance while the device is not selected.
2 SO tri_state Serial Data Output: SO remains in a high-impedance state when the device is not selected or after an invalid opcode until the next falling edge of CS.
3 WP input Write Protect: when WP is low and the WPEN bit is one, all writes to the status register are inhibited, and the WP function is blocked when WPEN is zero.
4 GND power_in Ground reference for the device.
5 SI input Serial Data Input: data is not accepted on SI when the device is not selected, and SI inputs are ignored while SO is high-impedance during HOLD.
6 SCK input Serial Data Clock: SCK is always an input, so the device operates as a slave; it must be low when HOLD is asserted or released.
7 HOLD input Suspends serial communication without resetting the sequence: pull low while SCK is low to pause and bring high while SCK is low to resume.
8 VCC power_in Power supply, specified from 1.8 V to 5.5 V over the recommended operating range.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TSSOP-8
Category Memory
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 -55 125 C 2
Storage Temperature -65 150 C 2
Voltage on Any Pin with Respect to Ground -1 7 V 2
Maximum Operating Voltage 6.25 V 2
DC Output Current 5 mA 2
Supply Voltage (1.8V variant, AT25640B-XHL) VCC1 1.8 5.5 V 4
Operating Temperature Range (Industrial) TAI -40 85 C 4
Supply Current (Read) ICC1 7.5 10 mA VCC = 5.0V at 20MHz, SO = Open, Read 4
Supply Current (Read, Write) ICC2 4 10 mA VCC = 5.0V at 20MHz, SO = Open, Read, Write 4
Supply Current (Read, Write, 5MHz) ICC3 4 6 mA VCC = 5.0V at 5MHz, SO = Open, Read, Write 4
Standby Current ISB1 6 μA VCC = 1.8V, CS = VCC 4
Standby Current ISB2 0.3 7 μA VCC = 2.5V, CS = VCC 4
Standby Current ISB3 2 10 μA VCC = 5.0V, CS = VCC 4
Input Leakage IIL -3 3 μA VIN = 0V to VCC 4
Output Leakage IOL -3 3 μA VIN = 0V to VCC, TAC = 0°C to 70°C 4
Input Low-voltage VIL -0.6 V 4
Output Low-voltage VOL1 0.4 V 3.6V <= VCC <= 5.5V, IOL = 3.0mA 4
Output Low-voltage VOL2 0.2 V 1.8V <= VCC <= 3.6V, IOL = 0.15mA 4
Output Capacitance (SO) COUT 8 pF VOUT = 0V 4
Input Capacitance (CS, SCK, SI, WP, HOLD) CIN 6 pF VIN = 0V 4
SCK Clock Frequency fSCK 0 5 MHz VCC = 1.8, 5.5V 5
Input Rise Time tRI 2 μs VCC = 1.8, 5.5V 5
Input Fall Time tFI 2 μs VCC = 1.8, 5.5V 5
SCK High Time tWH 80 ns VCC = 1.8, 5.5V 5
SCK Low Time tWL 80 ns VCC = 1.8, 5.5V 5
CS High Time tCS 100 ns VCC = 1.8, 5.5V 5
CS Setup Time tCSS 100 ns VCC = 1.8, 5.5V 5
CS Hold Time tCSH 100 ns VCC = 1.8, 5.5V 5
Data In Setup Time tSU 20 ns VCC = 1.8, 5.5V 5
Data In Hold Time tH 20 ns VCC = 1.8, 5.5V 5
HOLD Setup Time tHD 20 ns VCC = 1.8, 5.5V 5
HOLD Hold Time tCD 20 ns VCC = 1.8, 5.5V 5
Output Valid tV 0 80 ns VCC = 1.8, 5.5V 5
Output Hold Time tHO 0 ns VCC = 1.8, 5.5V 5
HOLD to Output Low Z tLZ 0 100 ns VCC = 1.8, 5.5V 6
HOLD to Output High Z tHZ 200 ns VCC = 1.8, 5.5V 6
Output Disable Time tDIS 200 ns VCC = 1.8, 5.5V 6
Write Cycle Time tWC 5 ms VCC = 1.8, 5.5V 6

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 U = Green, Matte Sn Lead Finish 14

CAD (KiCad official)

  • Symbol: AT25640B-XHL-T
  • Footprint: Package_SO:TSSOP-8_3x3mm_P0.65mm
  • 3D model: TSSOP-8 (KiCad packages3D, STEP)
  • 3D model files: at25640b-xhl-t-etched.step / at25640b-xhl-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at25640b-xhl-t.step / at25640b-xhl-t.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip Tech datasheet (23 pp, sha256 6eb63f39b2e61b60, retrieved 2026-10-18, tier: lcsc)
  • 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