# 74HC164N

**HGSEMI** · Shift Registers · DIP-14

74HC164N from HGSEMI, in a DIP-14. 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 | A | input | Serial data input A; it is ANDed with input B (QA = A·B) to form the data entering the first register stage, and it is sampled on the rising clock edge. |
| 2 | B | input | Serial data input B; it is ANDed with input A (QA = A·B) to form the data entering the first register stage, and it is sampled on the rising clock edge. |
| 3 | Qa | output | Register output Qa, the first bit of the 8-bit shift register, which shifts one position to the right on each rising CLOCK edge. |
| 4 | Qb | output | Register output Qb, which shifts one position to the right on each rising CLOCK edge. |
| 5 | Qc | output | Register output Qc, which shifts one position to the right on each rising CLOCK edge. |
| 6 | Qd | output | Register output Qd, which shifts one position to the right on each rising CLOCK edge. |
| 7 | GND | power_in | Ground reference for the device. |
| 8 | CLOCK | input | Clock input, active on the rising edge, with a minimum clock or clear pulse width of 18 ns (tW). |
| 9 | CLEAR | input | Active-low clear input that resets the register outputs to low; minimum clear pulse width is 18 ns (tW). |
| 10 | Qe | output | Register output Qe, which shifts one position to the right on each rising CLOCK edge. |
| 11 | Qf | output | Register output Qf, which shifts one position to the right on each rising CLOCK edge. |
| 12 | Qg | output | Register output Qg, which shifts one position to the right on each rising CLOCK edge. |
| 13 | Qh | output | Register output Qh, the last bit of the 8-bit shift register, which shifts out on each rising CLOCK edge. |
| 14 | VCC | power_in | Positive supply; the recommended operating range is 2.0 V to 6.0 V, with an absolute maximum of 6.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | DIP-14 |
| Category | Logic |
| Pins | 14 |

## 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 (absolute maximum) | VCC | -0.5 |  | 6.5 | V |  | 3 |
| Input/output voltage (absolute maximum), upper limit is VCC+0.5 | VIN, VOUT | -0.5 |  |  | V | max printed as VCC+0.5 | 3 |
| Input/output clamp current | IIK, IOK | -20 |  | 20 | mA |  | 3 |
| Output current per pin | IOUT | -25 |  | 25 | mA |  | 3 |
| Current per pin into VCC or GND | ICC | -50 |  | 50 | mA |  | 3 |
| Power dissipation | PD |  |  | 500 | mW |  | 3 |
| Storage temperature | TS | -65 |  | 150 | ℃ |  | 3 |
| Lead soldering temperature | TW |  |  | 260 | ℃ | 10s | 3 |
| Operating voltage (recommended) | VCC | 2 | 5 | 6 | V |  | 3 |
| Input/output voltage (recommended), upper limit is VCC | VIN, Vout | 0 |  |  | V | max printed as VCC | 3 |
| Input rise/fall time | tr tf | 0 |  | 1000 | ns | VCC=2.0V | 3 |
| Input rise/fall time | tr tf | 0 |  | 500 | ns | VCC=4.5V | 3 |
| Input rise/fall time | tr tf | 0 |  | 400 | ns | VCC=6.0V | 3 |
| Operating temperature | TA | -40 |  | 85 | ℃ |  | 3 |
| High-level input voltage | VIH | 1.5 |  |  | V | TA=25℃, VCC=2.0V | 4 |
| High-level input voltage | VIH | 3.15 |  |  | V | TA=25℃, VCC=4.5V | 4 |
| High-level input voltage | VIH | 4.2 |  |  | V | TA=25℃, VCC=6.0V | 4 |
| Low-level input voltage | VIL |  |  | 0.5 | V | TA=25℃, VCC=2.0V | 4 |
| Low-level input voltage | VIL |  |  | 1.35 | V | TA=25℃, VCC=4.5V | 4 |
| Low-level input voltage | VIL |  |  | 1.8 | V | TA=25℃, VCC=6.0V | 4 |
| High-level output voltage | VOH | 4.4 |  |  | V | TA=25℃, IOH=20μA, VCC=4.5V | 4 |
| High-level output voltage | VOH | 5.9 |  |  | V | TA=25℃, IOH=20μA, VCC=6.0V | 4 |
| High-level output voltage | VOH | 3.9 | 4.3 |  | V | TA=25℃, IOH=4.0mA, VCC=4.5V | 4 |
| High-level output voltage | VOH | 5.2 | 5.7 |  | V | TA=25℃, IOH=5.2mA, VCC=6.0V | 4 |
| Low-level output voltage (row labelled IOH=20μA as printed) | VOL |  |  | 0.1 | V | TA=25℃, IOH=20μA, VCC=2.0V | 4 |
| Low-level output voltage (row labelled IOH=4.0mA as printed) | VOL |  | 0.2 | 0.5 | V | TA=25℃, IOH=4.0mA, VCC=4.5V | 4 |
| Low-level output voltage (row labelled IOH=5.2mA as printed) | VOL |  | 0.3 | 0.5 | V | TA=25℃, IOH=5.2mA, VCC=6.0V | 4 |
| Input current | IIN |  |  | 1 | uA | TA=25℃, VI=VCC or GND, VCC=6.0V | 4 |
| Operating current (supply current) | ICC |  |  | 5 | uA | TA=25℃, VI=VCC or GND, IOUT=0μA, VCC=6.0V | 4 |
| Operating voltage (DC table) | VCC | 2 |  | 6 | V | TA=25℃ | 4 |

## CAD (KiCad official)

- Symbol: `74HC164N`
- Footprint: `Package_DIP:DIP-14_W7.62mm`
- 3D model: DIP-14 (KiCad packages3D, STEP)
- 3D model files: `74hc164n-etched.step` / `74hc164n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74hc164n.step` / `74hc164n.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8758075291695112192) (8 pp, sha256 `c4cbc1a54be27507`, retrieved 2026-10-19, tier: lcsc)
- **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-haiku-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/74hc164n-datasheet.pdf)