# SN74ABT245BN

**Texas Instruments** · Latches · PDIP-20

SN74ABT245BN from Texas Instruments, in a PDIP-20. 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 | DIR | input | Direction-control input: high transmits A data to the B bus, low transmits B data to the A bus. |
| 2 | A1 | bidirectional | A-bus I/O channel 1 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 3 | A2 | bidirectional | A-bus I/O channel 2 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 4 | A3 | bidirectional | A-bus I/O channel 3 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 5 | A4 | bidirectional | A-bus I/O channel 4 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 6 | A5 | bidirectional | A-bus I/O channel 5 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 7 | A6 | bidirectional | A-bus I/O channel 6 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 8 | A7 | bidirectional | A-bus I/O channel 7 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 9 | A8 | bidirectional | A-bus I/O channel 8 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 10 | GND | power_in | Ground. |
| 11 | B8 | bidirectional | B-bus I/O channel 8 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 12 | B7 | bidirectional | B-bus I/O channel 7 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 13 | B6 | bidirectional | B-bus I/O channel 6 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 14 | B5 | bidirectional | B-bus I/O channel 5 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 15 | B4 | bidirectional | B-bus I/O channel 4 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 16 | B3 | bidirectional | B-bus I/O channel 3 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 17 | B2 | bidirectional | B-bus I/O channel 2 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 18 | B1 | bidirectional | B-bus I/O channel 1 with 3-state output, high drive of -32 mA IOH and 64 mA IOL. |
| 19 | OE | input | Output-enable input: high disables the outputs and isolates the buses; tie to VCC through a pullup resistor to ensure high-impedance during power up or power down. |
| 20 | VCC | power_in | Supply voltage, 4.5 V to 5.5 V recommended. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-20 |
| Category | Logic ICs |
| Pins | 20 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 4.5 |  | 5.5 | V |  | 3 |
| High-level input voltage | VIH | 2 |  |  | V |  | 3 |
| Low-level input voltage | VIL |  |  | 0.8 | V |  | 3 |
| Input voltage | VI | 0 |  | 5.5 | V | 0 to VCC | 3 |
| High-level output current | IOH |  |  | -32 | mA |  | 3 |
| Low-level output current | IOL |  |  | 64 | mA |  | 3 |
| Input transition rise or fall rate | Δt/Δv |  |  | 5 | ns/V |  | 3 |
| Power-up ramp rate | Δt/ΔVCC | 200 |  |  | μs/V |  | 3 |
| Operating free-air temperature | TA | -40 |  | 85 | °C |  | 3 |
| Supply voltage range | VCC | -0.5 |  | 7 | V |  | 3 |
| Input voltage range (except I/O ports) | VI | -0.5 |  | 7 | V | Note 1 | 3 |
| Voltage applied to any output in high or power-off state | VO | -0.5 |  | 5.5 | V |  | 3 |
| Current into any output in the low state | IO |  |  | 128 | mA | SN74ABT245B | 3 |
| Input clamp current | IIK |  |  | -18 | mA | VI < 0 | 3 |
| Output clamp current | IOK |  |  | -50 | mA | VO < 0 | 3 |
| Package thermal impedance, N package | θJA |  | 69 |  | °C/W | Note 2 | 3 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 3 |
| Input clamp voltage | VIK |  |  | -1.2 | V | VCC = 4.5 V, II = −18 mA | 4 |
| High-level output voltage | VOH | 2.5 |  |  | V | VCC = 4.5 V, IOH = −3 mA | 4 |
| High-level output voltage | VOH | 3 |  |  | V | VCC = 5 V, IOH = −3 mA | 4 |
| High-level output voltage | VOH | 2 |  |  | V | VCC = 4.5 V, IOH = −24 mA | 4 |
| Low-level output voltage | VOL |  |  | 0.55 | V | VCC = 4.5 V, IOL = 48 mA | 4 |
| Input hysteresis | Vhys |  | 100 |  | mV |  | 4 |
| Input current, control inputs | II | -1 |  | 1 | μA | VCC = 0 to 5.5 V, VI = VCC or GND | 4 |
| Input current, A or B ports | II | -20 |  | 20 | μA | VCC = 2.1 V to 5.5 V, VI = VCC or GND | 4 |
| Power-up 3-state output current | IOZPU | -50 |  | 50 | μA | VCC = 0 to 2.1 V, VO = 0.5 V to 2.7 V, OE = X | 4 |
| Power-down 3-state output current | IOZPD | -50 |  | 50 | μA | VCC = 2.1 V to 0, VO = 0.5 V to 2.7 V, OE = X | 4 |
| Off-state output current high | IOZH |  |  | 10 | μA | VCC = 2.1 V to 5.5 V, VO = 2.7 V, OE ≥ 2 V | 4 |
| Off-state output current low | IOZL | -10 |  |  | μA | VCC = 2.1 V to 5.5 V, VO = 0.5 V, OE ≥ 2 V | 4 |
| Power-off leakage current | Ioff | -100 |  | 100 | μA | VCC = 0, VI or VO ≤ 5.5 V | 4 |
| Output high leakage current | ICEX |  |  | 50 | μA | VCC = 5.5 V, VO = 5.5 V, outputs high | 4 |
| Output short-circuit current | IO | -50 |  | -180 | mA | VCC = 5.5 V, VO = 2.5 V | 4 |
| Supply current, outputs high | ICC |  |  | 250 | μA | VCC = 5.5 V, IO = 0, VI = VCC or GND, outputs high | 4 |
| Supply current, outputs low | ICC |  |  | 30 | mA | VCC = 5.5 V, IO = 0, VI = VCC or GND, outputs low | 4 |
| Supply current, outputs disabled | ICC |  |  | 250 | μA | VCC = 5.5 V, IO = 0, VI = VCC or GND, outputs disabled | 4 |
| Supply current change, data inputs, outputs enabled | ΔICC |  |  | 1.5 | mA | VCC = 5.5 V, one input at 3.4 V, other inputs at VCC or GND, outputs enabled | 4 |
| Supply current change, data inputs, outputs disabled | ΔICC |  |  | 50 | μA | VCC = 5.5 V, one input at 3.4 V, other inputs at VCC or GND, outputs disabled | 4 |
| Supply current change, control inputs | ΔICC |  |  | 1.5 | mA | VCC = 5.5 V, one input at 3.4 V, other inputs at VCC or GND | 4 |
| Input capacitance, control inputs | Ci |  | 4 |  | pF | VI = 2.5 V or 0.5 V | 4 |
| Input/output capacitance, A or B ports | Cio |  | 8 |  | pF | VO = 2.5 V or 0.5 V | 4 |
| Propagation delay, low-to-high, A or B to B or A | tPLH | 1 |  | 3.6 | ns | CL = 50 pF | 5 |
| Propagation delay, high-to-low, A or B to B or A | tPHL | 1 |  | 3.9 | ns | CL = 50 pF | 5 |
| Output enable time to high level, OE to A or B | tPZH | 2 |  | 5.6 | ns | CL = 50 pF | 5 |
| Output enable time to low level, OE to A or B | tPZL | 1.9 |  | 6.2 | ns | CL = 50 pF | 5 |
| Output disable time from high level, OE to A or B | tPHZ | 2.2 |  | 5.9 | ns | CL = 50 pF | 5 |
| Output disable time from low level, OE to A or B | tPLZ | 1.5 |  | 4.5 | ns | CL = 50 pF | 5 |
| Skew, output to output | tsk(o) |  |  | 0.5 | ns | CL = 50 pF | 5 |

## CAD (KiCad official)

- Symbol: `SN74ABT245BN`
- Footprint: `Package_DIP:DIP-20_W7.62mm`
- 3D model: PDIP-20 (KiCad packages3D, STEP)
- 3D model files: `sn74abt245bn-etched.step` / `sn74abt245bn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74abt245bn.step` / `sn74abt245bn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74abt245bn.pdf) (32 pp, sha256 `1dc8a3424d8a829f`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/sn74abt245bn-datasheet.pdf)