CD4025B Triple NOR Gate

@@ -0,0 +1,72 @@+# 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++- `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](https://www.ti.com/lit/ds/symlink/cd4025b.pdf) (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](docs/cd4025-datasheet.pdf)

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