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CD4025B Triple NOR Gate

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by Ray

Triple NOR Gate in the 4000B CMOS family, 3 V to 18 V.

logicgate4000-seriescmostisoic-14
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CD4025B

Texas Instruments · Logic Gate · SOIC-14

The CD4025B contains three independent 3-input NOR gates; each output is high only when all three inputs are low. It runs from 3 V to 18 V, part of the 4000B CMOS logic family.

Pinout

Pin Name Type Function
1 1A input Gate 1 input A. High-impedance CMOS input with internal protection diodes. Input high level VIH = 3.5 V (at VDD=5 V) / 11 V (at VDD=15 V).
2 1B input Gate 1 input B. High-impedance CMOS input; all three gate-1 inputs are ORed then inverted to produce output Y1 on pin 9.
3 2A input Gate 2 input A. High-impedance CMOS input; contributes to NOR output Y2 on pin 6.
4 2B input Gate 2 input B. High-impedance CMOS input; contributes to NOR output Y2 on pin 6.
5 2C input Gate 2 input C. High-impedance CMOS input; contributes to NOR output Y2 on pin 6.
6 2Y output Gate 2 output = NOR(2A, 2B, 2C). Buffered CMOS push-pull output; IOL/IOH ≈ 1 mA typical at VDD=10 V.
7 VSS power_in Negative supply / ground reference. Normally tied to 0 V; all input and output voltages are referenced to VSS.
8 1C input Gate 1 input C. High-impedance CMOS input; contributes to NOR output Y1 on pin 9.
9 1Y output Gate 1 output = NOR(1A, 1B, 1C). Buffered CMOS push-pull output; symmetrical source/sink drive.
10 3Y output Gate 3 output = NOR(3A, 3B, 3C). Buffered CMOS push-pull output.
11 3A input Gate 3 input A. High-impedance CMOS input; contributes to NOR output Y3 on pin 10.
12 3B input Gate 3 input B. High-impedance CMOS input; contributes to NOR output Y3 on pin 10.
13 3C input Gate 3 input C. High-impedance CMOS input; contributes to NOR output Y3 on pin 10.
14 VDD power_in Positive supply. Recommended operating range 3 V to 18 V (absolute max 20 V). All inputs are protected by CMOS input protection network referenced between VDD and VSS.

Key specifications

Parameter Value
Type Triple NOR Gate
Logic family 4000B (CMOS)
Supply voltage 3 V to 18 V
Propagation delay 45 ns typ at 10 V
Operating temperature -55 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • CD4025BE
  • CD4025BBE
  • CD4025BBE.A
  • CD4025BBEE4
  • CD4025BF
  • CD4025BBF
  • CD4025BBF3A
  • CD4025BF3A
  • CD4025BM
  • CD4025BBM
  • CD4025BBM96
  • CD4025BBMT
  • CD4025BNSR
  • CD4025BBNSR
  • CD4025BPW
  • CD4025BPWR
  • CD4025BPWE4
  • CD4025BBPW
  • CD4025BBPWR

CAD (KiCad official)

  • Symbol: cd4025.kicad_sym
  • Footprint: cd4025.kicad_mod
  • 3D model: SOIC-14 body from KiCad Package_SO/SOIC-14_3.9x8.7mm_P1.27mm.

Provenance

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

  • Datasheet: Texas Instruments datasheet (23 pp, sha256 d33d12a8e68dd293, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF