74VHC165FT - 8-Bit PISO Shift Register, 16-TSSOP | Toshiba
N.º da peça: 74VHC165FT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.4 | $0,40 |
| 10 | $0.32 | $3,20 |
| 100 | $0.22 | $22,00 |
| 500 | $0.17 | $85,00 |
| 1.000 | $0.15 | $150,00 |
74VHC165FT Visão geral
A shift register is a sequential logic block that converts parallel data to a serial stream (PISO) or a serial stream to parallel data (SISO/PIPO). In the broader digital hierarchy it belongs to logic ICs → shift registers → CMOS logic → standard logic ICs. PISO shift registers like the 74VHC165FT are commonly used to expand microcontroller GPIO by reporting eight parallel inputs over a single serial pin, reducing board routing complexity in button/keypad scanning, multi-channel ADC front-ends, and display drivers.
Key features include eight parallel inputs (D0-D7) with parallel load control (SH/LD'), a clock inhibit pin, asynchronous complementary serial outputs (Q7, Q7'), and standard CMOS low-power dissipation. The 74VHC165FT typically exhibits low quiescent current and high noise margin, making it suited for mixed-signal boards where analog and digital sections must coexist on the same supply. The TSSOP-16B footprint (also referred to as 16-TSSOP) is JEDEC-compliant and pin-compatible with industry-standard 74xx165 logic from other vendors.
The architecture uses a master/slave flip-flop chain with asynchronous parallel-load steering logic. When SH/LD' is held LOW, the eight D inputs are asynchronously loaded into the register, overriding any serial activity; when SH/LD' is HIGH, the device shifts on each rising clock edge. The clock-inhibit (CK INH) and serial-data-in (SER) pins allow daisy-chaining multiple 74VHC165 devices for 16-, 24-, or 32-bit input expansion over a single serial line.
Typical applications include industrial PLC digital-input modules, keyboard matrix scanners, multi-channel switch-monitor front-ends, LED driver shift chains (when paired with companion PIPO parts), and automotive body-control modules. The wide operating temperature and CMOS noise immunity make it a strong fit for factory-automation and instrumentation.
When designing with this device, observe the SH/LD' pulse width (tW) and clock-to-Q propagation delay (tpd) in your timing budget; the asynchronous parallel load is the fastest way to capture a snapshot of the eight inputs but must be glitch-free. Add a small RC on SH/LD' if mechanical switches are wired directly to D inputs.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers select and source the 74VHC165FT quickly.
Alternativas drop-in para 74VHC165FT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com 74VHC165FT (mesmo formato e footprint) — diferindo em Function, Logic Family, Number of Bits per Element, Output Type, Package.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TC74VHC165FTELM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
74VHC165FT
✅ Drop-In✓ Em estoque
$0.15 / unidade
Ver ficha técnica →74VHC165FT
✅ Drop-In✓ Em estoque
$0.15 / unidade
Ver ficha técnica →SN74HC165PW
✅ Drop-In✓ Em estoque
$0.22 / unidade
Ver ficha técnica →74HC165PW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
74VHC165FT Classificações máximas e características elétricas
| Função | Parallel-In/Serial-Out (PISO) Shift Register |
| Number of Bits per Element | 8 bit |
| Number of Elements | 1 |
| Logic Family | VHC (High-speed CMOS) |
| Technology | C2MOS (Silicon-gate CMOS) |
| Tipo de saída | Complementary (Q7 and Q7') |
| Supply Voltage (VCC) | 2 V to 5.5 V |
| Input Type | Parallel (D0-D7) + Serial (SER) |
| Trigger Type | Positive Edge (with asynchronous parallel load) |
| Temperatura de operação | -40 C to +125 C (Toshiba VHC logic) |
| Encapsulamento | TSSOP-16B (16-TSSOP) |
| Tipo de montagem | Surface Mount |
| Nível MSL | MSL 1 (Unlimited) |
| Status RoHS | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
Configuração de pinos do 74VHC165FT
| Pino 1 | SH/LD' — Shift/Load (active-LOW parallel load) |
| Pino 2 | D0 — Parallel data input 0 |
| Pino 3 | D1 — Parallel data input 1 |
| Pino 4 | D2 — Parallel data input 2 |
| Pino 5 | D3 — Parallel data input 3 |
| Pino 6 | D4 — Parallel data input 4 |
| Pino 7 | D5 — Parallel data input 5 |
| Pino 8 | D6 — Parallel data input 6 |
| Pino 9 | D7 — Parallel data input 7 |
| Pino 10 | GND — Ground |
| Pino 11 | SER — Serial data input (for cascading) |
| Pino 12 | CLK — Shift clock (rising edge) |
| Pino 13 | CK INH — Clock inhibit (HIGH disables clock) |
| Pino 14 | Q7' — Complementary serial output |
| Pino 15 | Q7 — Serial output (non-inverted) |
| Pino 16 | VCC — Supply voltage (2 V to 5.5 V) |
Aplicações típicas
74VHC165FT é adequado para 6 aplicaçãos: Industrial PLC Digital Input Module, Keyboard / Keypad Matrix Scanner, Multi-Channel Switch & Sensor Monitor Front-End, Automotive Body-Control Switch Reading, Test & Measurement Data Acquisition Front-End, IoT Sensor Hub Edge Aggregation.
Industrial PLC Digital Input Module
The 74VHC165FT's 8-bit parallel-to-serial conversion and 2-5.5V VCC range make it a strong fit for industrial PLC digital-input modules where dozens of field switches, sensors, and contactors must be reported back to a single microcontroller serial port. Its CMOS noise immunity and -40C to +125C tolerance suit electrically noisy factory floors with long cable runs. The asynchronous parallel load captures all eight inputs simultaneously, eliminating skew that would otherwise corrupt encoder or limit-switch state. Pair it with an optocoupler-isolated front end such as the Toshiba TLP281 for 24V field wiring. Compared to a discrete shift-register chain of flip-flops, the 74VHC165FT saves PCB area, simplifies firmware (single SH/LD' pulse plus N clocks), and reduces MCU GPIO consumption from 8 lines down to 3 (SH/LD', CLK, Q7).
Recomendado
Keyboard / Keypad Matrix Scanner
Scanning a 64- or 96-key matrix over a single serial line is the canonical use case for the 74VHC165FT PISO shift register. Eight parallel inputs drive the row (or column) lines while the MCU clocks the Q7 serial output to read key states in one SPI-like transaction, freeing GPIO for LEDs, displays, or other peripherals. The 2-5.5V VCC window matches both 3.3V low-power microcontrollers and legacy 5V scan controllers, allowing the same PCB to drop into different product tiers. Complementary Q7' output simplifies ghosting-detection logic on diode-equipped matrices. For compact keyboards, two 74VHC165FTs can be cascaded for 16-row scanning with no extra MCU pins beyond the three control lines. Compared to a matrix-scanned GPIO approach, the shift-register method dramatically reduces MCU wake time and pin count.
Recomendado
Multi-Channel Switch & Sensor Monitor Front-End
Battery management systems, security panels, and HVAC controllers commonly aggregate many discrete digital inputs (door switches, smoke detectors, fault flags) into one serial-reporting front-end built on the 74VHC165FT. The asynchronous parallel load ensures all eight inputs are sampled at the same instant, which is critical for time-correlated diagnostics like simultaneous fault capture. VHC noise margins reject the ringing and crosstalk typical of long PCB traces in switch panels. The 16-TSSOP footprint occupies minimal board area, leaving room for the isolation barrier and RS-485 transceiver on the same module. Pair the part with an ATMEGA164A-AU MCU for integrated UART reporting or with a TI ISO3086 for isolated industrial networks.
Recomendado
Automotive Body-Control Switch Reading
The 74VHC165FT is widely used in automotive body-control modules to read window, mirror, and seat-position switches over a single LIN or CAN-attached serial line. Its -40C to +125C operating range handles the under-hood thermal environment, and the CMOS input thresholds reject automotive electrical noise. Cascade two 74VHC165FTs to scan 16 switches per module without burdening the main MCU. For AEC-Q100 qualified automotive programs, however, designers should select dedicated automotive-grade 74HC165 or VHC165 equivalents from TI/NXP rather than this industrial-grade Toshiba part.
Recomendado
Test & Measurement Data Acquisition Front-End
In bench-top instruments and rack-mount data acquisition systems, the 74VHC165FT serves as a parallel-input multiplexer for digital status lines (over-range flags, fault indicators, calibration switches) that must be sampled synchronously with the analog-to-digital converter. The asynchronous parallel-load path lets the instrument capture all status bits on a single trigger event, eliminating the need for the FPGA or MCU to dedicate 8 GPIO to status monitoring. VHC 5V compatibility aligns with traditional instrument logic rails. Compared to discrete TTL buffers, the 74VHC165FT provides both serialization and storage in one chip.
Recomendado
IoT Sensor Hub Edge Aggregation
Low-power IoT sensor hubs and edge nodes often aggregate many digital sensors (PIR, reed, door, vibration) and report them to a host MCU, BLE module, or LoRa transmitter over a single serial line. The 74VHC165FT's low quiescent current and 2-5.5V operation make it suitable for battery-powered sensor nodes that need to wake briefly, snapshot eight sensors, and return to sleep. Daisy-chain Q7→SER for 16+ sensor channels with no additional MCU pins. Pair with an ultra-low-power MSP430 host and a low-cost LCSC-sourced 74VHC165FT for cost-sensitive consumer IoT.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para 74VHC165FT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TC74VHC165FTELM | 74VHC165FT(BE) | 74VHC165FT(BJ) | SN74HC165PW | 74HC165PW |
|---|---|---|---|---|---|---|
| Package | TSSOP-16 (16-TSSOP) | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same |
| Brand | Toshiba | Toshiba | Toshiba | Toshiba | Texas Instruments | NXP Semiconductors |
| Logic Family | VHC (2-5.5 V) | VHC (2-5.5 V) | VHC (2-5.5 V) | VHC (2-5.5 V) | HC (2-6 V) | HC (2-6 V) |
| Bits per Element | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Elements | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Type | Q7 and Q7' (complementary) | Q7 and Q7' | Q7 and Q7' | Q7 and Q7' | Q7 and Q7' | Q7 and Q7' |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| RoHS / REACH | ROHS3 Compliant / REACH Unaffected | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS Compliant | ROHS Compliant |
| Approx. Unit Price @ 100 pcs (as of 2026-10-06) | $0.22 | $0.22 | $0.23 | $0.22 | $0.30 | $0.28 |
Principais diferenciais
- Toshiba VHC 2-5.5 V wide-VCC characterization (vs SN74HC165PW (Texas Instruments HC family))
- Same-brand same-die cross-reference for supply continuity (vs TC74VHC165FTELM (Toshiba))
- Pin-compatible across 74xx165 logic family (vs 74HC165PW (NXP Semiconductors))
Notas de projeto
Estimated: at 5 V VCC and 50 pF load, the 74VHC165FT clock-to-Q propagation delay is on the order of 10-15 ns, allowing shift clocks above 30 MHz in short-trace designs. For cascaded 16+ bit chains, add a 100 ohm series resistor near the Q7 driver to dampen reflections on the SER trace, and keep the SER routing under 50 mm to preserve edge integrity.
Do not leave SH/LD' floating; tie it to VCC through a 10 kohm pull-up if it is not actively driven, otherwise the part may inadvertently load parallel data on power-up glitches. CK INH must also be tied LOW (enabled) if unused; a floating CK INH pin can mask clock edges and freeze the shift register.
Place a 100 nF ceramic bypass capacitor within 5 mm of the VCC pin (pin 16) and a 1 uF bulk cap on the same supply rail. The TSSOP-16B thermal pad is not present on this part, but keep the GND pin (pin 10) flooded with a low-impedance ground pour to support the high-speed switching transients of Q7/Q7'. For multi-register boards, route CLK and SH/LD' as a star from the MCU to avoid skew between cascaded 74VHC165FTs.
Informações de conformidade
ROHS3 Compliant and REACH Unaffected per Toshiba product page; MSL 1 unlimited floor life. Not AEC-Q100 qualified - select automotive-grade variants for vehicle programs.
