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SN74AC245N

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Texas Instruments Buffers / Drivers, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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SN74AC245N

Texas Instruments · Buffers / Drivers · PDIP-20

SN74AC245N 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 that selects A-to-B (high) or B-to-A (low) data transmission when OE is low.
2 A1 bidirectional A1 bus input/output, outputs data to B1 when DIR is high and receives from B1 when DIR is low.
3 A2 bidirectional A2 bus input/output, port paired with B2.
4 A3 bidirectional A3 bus input/output, port paired with B3.
5 A4 bidirectional A4 bus input/output, port paired with B4.
6 A5 bidirectional A5 bus input/output, port paired with B5.
7 A6 bidirectional A6 bus input/output, port paired with B6.
8 A7 bidirectional A7 bus input/output, port paired with B7.
9 A8 bidirectional A8 bus input/output, port paired with B8.
10 GND power_in Ground pin.
11 B8 bidirectional B8 bus input/output, port paired with A8.
12 B7 bidirectional B7 bus input/output, port paired with A7.
13 B6 bidirectional B6 bus input/output, port paired with A6.
14 B5 bidirectional B5 bus input/output, port paired with A5.
15 B4 bidirectional B4 bus input/output, port paired with A4.
16 B3 bidirectional B3 bus input/output, port paired with A3.
17 B2 bidirectional B2 bus input/output, port paired with A2.
18 B1 bidirectional B1 bus input/output, port paired with A1.
19 OE input Output enable input; high isolates the buses, and it should be tied to VCC through a pullup resistor to ensure high-impedance during power up or power down.
20 VCC power_in Power supply pin, operating range 2 V to 6 V.

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 -0.5 7 V 4
Input clamp current IIK -20 20 mA VI < 0 or VI > VCC 4
Output clamp current IOK -20 20 mA VO < 0 or VO > VCC 4
Continuous output current IO -65 50 mA VO = 0 to VCC 4
Continuous current through VCC or GND -200 200 mA 4
Storage temperature Tstg -65 150 °C 4
ESD HBM V(ESD) -3000 3000 V Human body model, ANSI/ESDA/JEDEC JS-001 4
ESD CDM V(ESD) -1000 1000 V Charged-device model, JESD22-C101 4
Supply voltage VCC 2 6 V 5
High-level input voltage VIH 2.1 V VCC = 3 V 5
High-level input voltage VIH 3.15 V VCC = 4.5 V 5
High-level input voltage VIH 3.85 V VCC = 5.5 V 5
Low-level input voltage VIL 0.9 V VCC = 3 V 5
Low-level input voltage VIL 1.35 V VCC = 4.5 V 5
Low-level input voltage VIL 1.65 V VCC = 5.5 V 5
Input voltage VI 0 6 V 0 to VCC 5
Output voltage VO 0 6 V 0 to VCC 5
High-level output current IOH -12 mA VCC = 3 V 5
High-level output current IOH -24 mA VCC = 4.5 V 5
Low-level output current IOL 12 mA VCC = 3 V 5
Low-level output current IOL 24 mA VCC = 4.5 V 5
Input transition rise or fall rate Δt/Δv 8 ns/V 5
Operating free-air temperature TA -40 85 °C 5
Junction-to-ambient thermal resistance RθJA 69 °C/W N (PDIP) 20 pins 5
High-level output voltage VOH 2.9 V IOH = −50 µA, VCC = 3 V 6
High-level output voltage VOH 4.4 V IOH = −50 µA, VCC = 4.5 V 6
High-level output voltage VOH 5.4 V IOH = −50 µA, VCC = 5.5 V 6
High-level output voltage VOH 2.46 V IOH = −12 mA, VCC = 3 V 6
High-level output voltage VOH 3.76 V IOH = −24 mA, VCC = 4.5 V 6
High-level output voltage VOH 4.76 V IOH = −24 mA, VCC = 5.5 V 6
High-level output voltage VOH 3.85 V IOH = 50 mA, VCC = 5.5 V 6
Low-level output voltage VOL 0.1 V IOL = 50 µA, VCC = 3 V 6
Low-level output voltage VOL 0.44 V IOL = 12 mA, VCC = 3 V 6
Low-level output voltage VOL 1.65 V IOL = 50 mA, VCC = 5.5 V 6
Input current A or B ports II -1 1 µA VI = VCC or 0, VCC = 5.5 V 6
Input current OE or DIR II -1 1 µA VI = VCC or 0, VCC = 5.5 V 6
Off-state output current IOZ -5 5 µA VO = VCC or GND, VI(OE) = VIL or VIH, VCC = 5.5 V 6
Supply current ICC 40 µA VI = VCC or GND, IO = 0, VCC = 5.5 V 6
Input capacitance Ci 4.5 pF VI = VCC or GND, VCC = 5 V 6
Input/output capacitance Cio 15 pF VO = VCC or GND, VCC = 5 V 6
Propagation delay A or B to B or A tPLH 1 9 ns VCC = 3.3 V ± 0.3 V 6
Output enable time OE to A or B tPZH 2 12.5 ns VCC = 3.3 V ± 0.3 V 6
Output enable time OE to A or B tPZL 2 13.5 ns VCC = 3.3 V ± 0.3 V 6
Output disable time OE to A or B tPHZ 1 12.5 ns VCC = 3.3 V ± 0.3 V 6
Output disable time OE to A or B tPLZ 1.5 13 ns VCC = 3.3 V ± 0.3 V 6
Propagation delay A or B to B or A tPLH 1 7 ns VCC = 5 V ± 0.5 V 7
Output enable time OE to A or B tPZH 1 9 ns VCC = 5 V ± 0.5 V 7
Output enable time OE to A or B tPZL 1 9.5 ns VCC = 5 V ± 0.5 V 7
Output disable time OE to A or B tPHZ 1 10 ns VCC = 5 V ± 0.5 V 7
Power dissipation capacitance per transceiver Cpd 45 pF CL = 50 pF, f = 1 MHz, VCC = 5 V, TA = 25°C 7

CAD (KiCad official)

  • Symbol: SN74AC245N
  • Footprint: Package_DIP:DIP-20_W7.62mm
  • 3D model: PDIP-20 (KiCad packages3D, STEP)
  • 3D model files: sn74ac245n-etched.step / sn74ac245n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ac245n.step / sn74ac245n.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (33 pp, sha256 a18293ff3ade9e58, retrieved 2026-10-22, tier: manufacturer)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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