# SN74HCT139DR

**Texas Instruments** · Logic ICs · SOIC-16

SN74HCT139DR from Texas Instruments, in a SOIC-16. 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 | 1G | input | Active-low enable input for decoder 1; can be used as a data line in demultiplexing applications. |
| 2 | 1A | input | Select input A (LSB) for decoder 1, TTL-compatible with VIH min 2 V and VIL max 0.8 V. |
| 3 | 1B | input | Select input B (MSB) for decoder 1, TTL-compatible with VIH min 2 V and VIL max 0.8 V. |
| 4 | 1Y0 | output | Decoder 1 output Y0, active low, driving ±4 mA at 5 V. |
| 5 | 1Y1 | output | Decoder 1 output Y1, active low, driving ±4 mA at 5 V. |
| 6 | 1Y2 | output | Decoder 1 output Y2, active low, driving ±4 mA at 5 V. |
| 7 | 1Y3 | output | Decoder 1 output Y3, active low, driving ±4 mA at 5 V. |
| 8 | GND | power_in | Ground pin. |
| 9 | 2Y3 | output | Decoder 2 output Y3, active low, driving ±4 mA at 5 V. |
| 10 | 2Y2 | output | Decoder 2 output Y2, active low, driving ±4 mA at 5 V. |
| 11 | 2Y1 | output | Decoder 2 output Y1, active low, driving ±4 mA at 5 V. |
| 12 | 2Y0 | output | Decoder 2 output Y0, active low, driving ±4 mA at 5 V. |
| 13 | 2B | input | Select input B (MSB) for decoder 2, TTL-compatible with VIH min 2 V and VIL max 0.8 V. |
| 14 | 2A | input | Select input A (LSB) for decoder 2, TTL-compatible with VIH min 2 V and VIL max 0.8 V. |
| 15 | 2G | input | Active-low enable input for decoder 2; can be used as a data line in demultiplexing applications. |
| 16 | VCC | power_in | Supply voltage, 4.5 V to 5.5 V recommended, with a 0.1-µF bypass capacitor placed close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic ICs |
| Pins | 16 |

## 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 range | 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 | -25 |  | 25 | mA | VO = 0 to VCC | 4 |
| Continuous current through VCC or GND |  | -50 |  | 50 | mA |  | 4 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 4 |
| Storage temperature range | Tstg | -65 |  | 150 | ℃ |  | 4 |
| Supply voltage | VCC | 4.5 | 5 | 5.5 | V |  | 4 |
| High-level input voltage | VIH | 2 |  |  | V | VCC = 4.5 V to 5.5 V | 4 |
| Low-level input voltage | VIL |  |  | 0.8 | V | VCC = 4.5 V to 5.5 V | 4 |
| Input voltage | VI | 0 |  |  | V |  | 4 |
| Output voltage | VO | 0 |  |  | V |  | 4 |
| Input transition (rise and fall) time | tt |  |  | 500 | ns |  | 4 |
| Operating free-air temperature (SN74HCT139) | TA | -40 |  | 85 | °C |  | 4 |
| High level output voltage | VOH | 4.4 | 4.499 |  | V | VI = VIH or VIL, IOH = −20 µA, VCC = 4.5 V; typ at TA = 25°C | 5 |
| High level output voltage | VOH | 3.84 | 4.3 |  | V | VI = VIH or VIL, IOH = −4 mA, VCC = 4.5 V; typ at TA = 25°C | 5 |
| Low level output voltage | VOL |  | 0.001 | 0.1 | V | VI = VIH or VIL, IOL = 20 µA; typ at TA = 25°C | 5 |
| Low level output voltage | VOL |  | 0.17 | 0.33 | V | VI = VIH or VIL, IOL = 4 mA; typ at TA = 25°C | 5 |
| Input leakage current | II | -1000 | 0.1 | 1000 | nA | VI = VCC or 0, VCC = 5.5 V; typ at TA = 25°C | 5 |
| Supply current | ICC |  | 8 | 80 | µA | VI = VCC or 0, IO = 0, VCC = 5.5 V; typ at TA = 25°C | 5 |
| Supply current change | ΔICC |  | 1.4 | 2.9 | mA | One input at 0.5 V or 2.4 V, other inputs at 0 or VCC, VCC = 5.5 V; typ at TA = 25°C | 5 |
| Input capacitance | Ci |  | 3 | 10 | pF | VCC = 4.5 V to 5.5 V; typ at TA = 25°C | 5 |
| Propagation delay A or B to Y | tpd |  | 14 | 43 | ns | CL = 50 pF, VCC = 4.5 V; typ at TA = 25°C | 5 |
| Propagation delay A or B to Y | tpd |  | 12 | 40 | ns | CL = 50 pF, VCC = 5.5 V; typ at TA = 25°C | 5 |
| Propagation delay G to Y | tpd |  | 11 | 43 | ns | CL = 50 pF, VCC = 4.5 V; typ at TA = 25°C | 5 |
| Propagation delay G to Y | tpd |  | 10 | 40 | ns | CL = 50 pF, VCC = 5.5 V; typ at TA = 25°C | 5 |
| Output transition time Y | tt |  | 8 | 19 | ns | CL = 50 pF, VCC = 4.5 V; typ at TA = 25°C | 5 |
| Output transition time Y | tt |  | 6 | 17 | ns | CL = 50 pF, VCC = 5.5 V; typ at TA = 25°C | 5 |
| Package thermal impedance | RθJA |  | 73 |  | °C/W | D (SOIC) package, 16 pins | 4 |

## CAD (KiCad official)

- Symbol: `SN74HCT139DR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `sn74hct139dr-etched.step` / `sn74hct139dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hct139dr.step` / `sn74hct139dr.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/sn74hct139.pdf) (23 pp, sha256 `2008a255df648fb6`, retrieved 2026-10-18, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/sn74hct139dr-datasheet.pdf)