SN74LVC374A-Q1 - Octal D Flip-Flop, 3-State | Texas Instruments
MPN: SN74LVC374A-Q1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.5 | $5.00 |
| 100 | $0.38 | $38.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.26 | $260.00 |
SN74LVC374A-Q1 Overview
An octal D-type flip-flop is a sequential logic IC in the 74-series logic family that captures eight data bits simultaneously on the rising edge of a clock signal and holds them until the next clock edge. Within the logic hierarchy, it belongs to the flip-flop/latch category of CMOS integrated circuits, which sit inside the broader domain of digital logic ICs and semiconductor components. The 3-state outputs allow the device to be electrically disconnected from a shared bus, enabling multi-drop bus architectures.
Key features include 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads, 5.5V-tolerant input pins allowing safe interfacing with 5V logic systems, and typical output ground bounce (VOLP) and VOH undershoot (VOHV) specifications provided at VCC = 3.3V, 25C. As a high-drive CMOS device, it delivers 32 mA of drive current at 3.3V, making it ideal for driving multiple outputs and for high-speed applications up to 100 MHz, according to TI's SNx4LVC374A literature.
The Q1 automotive-catalog variant is qualified for automotive environments and suits AEC-relevant designs. The architecture uses edge-triggered master-slave storage with a common clock (CP) pin and an active-low output-enable (OE) pin that controls all eight 3-state outputs independently of the clock.
Typical applications include automotive body electronics, bus-interface buffering and data retention, register banks in instrumentation, and memory address/data latching where a shared 3-state bus is required.
Design tip: tie the OE pin high through a pull-up resistor at power-up to keep the bus disconnected until the clock and data lines are stable, avoiding bus contention during system initialization.
Drop-in alternatives for SN74LVC374A-Q1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN74LVC374A
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SN54LVC374A
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SN74BCT574
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View Datasheet →74LVC374
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SN74LVC374A-Q1 Maximum Ratings & Electrical Characteristics
| Function | Octal edge-triggered D-type flip-flop with 3-state outputs |
| Supply Voltage Range | 1.65 V to 3.6 V |
| Designed VCC Operation | 2.7 V to 3.6 V |
| Input Tolerance | Inputs accept voltages up to 5.5 V |
| Output Drive Current | 32 mA at 3.3 V |
| Operating Frequency | Up to 100 MHz (high-speed applications) |
| Output Ground Bounce VOLP | Typical, at VCC = 3.3V, 25C |
| Output VOH Undershoot VOHV | Typical, at VCC = 3.3V, 25C |
| Output Type | 3-state |
| Clock Enable | Common clock (CP), active-low output enable (OE) |
| Qualification | Automotive catalog (AEC-Q100 qualified Q1) |
| Packages | SOIC-20 (DW), TSSOP-20 (PW) |
| Mounting Type | Surface Mount |
| Logic Family | LVC (Low-Voltage CMOS) |
| Number of Bits | 8 |
SN74LVC374A-Q1 Pin Configuration
| Pin 1 | OE — Output enable, active low (3-state control) |
| Pin 2 | 1D — Data input, flip-flop 1 |
| Pin 3 | 2D — Data input, flip-flop 2 |
| Pin 4 | 3D — Data input, flip-flop 3 |
| Pin 5 | 4D — Data input, flip-flop 4 |
| Pin 6 | 5D — Data input, flip-flop 5 |
| Pin 7 | 6D — Data input, flip-flop 6 |
| Pin 8 | 7D — Data input, flip-flop 7 |
| Pin 9 | 8D — Data input, flip-flop 8 |
| Pin 10 | GND — Ground |
| Pin 11 | CP — Clock input, positive-edge triggered |
| Pin 12 | 1Q — 3-state output, flip-flop 1 |
| Pin 13 | 2Q — 3-state output, flip-flop 2 |
| Pin 14 | 3Q — 3-state output, flip-flop 3 |
| Pin 15 | 4Q — 3-state output, flip-flop 4 |
| Pin 16 | 5Q — 3-state output, flip-flop 5 |
| Pin 17 | 6Q — 3-state output, flip-flop 6 |
| Pin 18 | 7Q — 3-state output, flip-flop 7 |
| Pin 19 | 8Q — 3-state output, flip-flop 8 |
| Pin 20 | VCC — Power supply, 1.65V to 3.6V |
Typical Applications
SN74LVC374A-Q1 is suitable for 6 applications: Automotive Body Electronics, Bus-Interface Buffering and Data Retention, Register Banks in Instrumentation, Memory Address/Data Latching, Industrial I/O and PLC Modules, Networking and Telecom Line-Card Logic.
Automotive Body Electronics
In automotive body control modules, door zones, and lighting controllers, the SN74LVC374A-Q1 provides Q1-qualified latching of status and control signals on 3.3V or 5V-tolerant buses. Its 32 mA drive at 3.3V directly drives wiring-harness loads and indicator inputs, while 3-state outputs let multiple registers share a single microcontroller read-back bus. The automotive catalog qualification and robust VOLP/VOHV ground-bounce performance suit the noisy 12V electrical environment.
Recommended
Bus-Interface Buffering and Data Retention
The SN74LVC374A-Q1 is explicitly designed for bus-interface applications where data must be retained or latched, per TI's SNx4LVC374A literature. Eight bits are captured on one rising clock edge, holding a full byte stable while the upstream bus moves on. The 5.5V-tolerant inputs allow direct connection to legacy 5V buses, and the active-low OE lets the register release the bus instantly for multi-master arbitration. Operating up to 100 MHz covers high-speed backplane timing budgets.
Recommended
Register Banks in Instrumentation
Test and measurement instruments use cascaded SN74LVC374A-Q1 registers to build parallel register banks for control-word storage and status capture. The edge-triggered architecture guarantees glitch-free parallel output updates on a single clock edge, and the 3-state outputs allow multiple registers to time-share a processor data bus. At 3.3V, 32 mA drive supports long backplane traces and multiple fan-out loads without external buffering.
Recommended
Memory Address/Data Latching
In microprocessor and FPGA systems, the SN74LVC374A-Q1 latches multiplexed address or data bytes so a single bus can serve memory and peripherals. The 100 MHz capability keeps pace with fast bus cycles, while typical VOLP ground-bounce control at VCC = 3.3V protects signal integrity when eight outputs switch simultaneously. The OE pin provides the bus-release function required for DMA and shared-memory arbitration schemes.
Recommended
Industrial I/O and PLC Modules
Industrial PLC I/O cards use the SN74LVC374A-Q1 to latch output states and snapshot input banks on demand. Its 1.65V to 3.6V supply fits modern 3.3V controllers, while 5.5V-tolerant inputs survive legacy 5V field-logic interfaces. The 3-state outputs let several cards share a common backplane data bus, and the robust CMOS input structure tolerates slow-rising, noise-prone industrial signals without oscillation.
Recommended
Networking and Telecom Line-Card Logic
Line cards and control planes in networking equipment use the SN74LVC374A-Q1 for status register capture and LED/configuration latching. The 32 mA output drive at 3.3V directly sources LED indicators, and the 3-state bus output simplifies hot-adjacent-card isolation. Typical VOH undershoot (VOHV) and VOLP ground-bounce control at 25C help meet the tight noise margins of dense multi-layer line-card PCBs.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVC374A-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVC374A | SN54LVC374A | SN74LVC374A-EP |
|---|---|---|---|---|
| Package | SOIC-20 (DW) / TSSOP-20 (PW) | SOIC-20 (DW) / TSSOP-20 (PW) - same | SOIC-20 / CDIP-20 | SOIC-20 (DW) / TSSOP-20 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V |
| Output Drive | 32 mA at 3.3V | 32 mA at 3.3V | 32 mA at 3.3V | 32 mA at 3.3V |
| Qualification | Automotive catalog (Q1) | Standard commercial/industrial | Military temperature | Enhanced product (EP) |
| Input Tolerance | 5.5V max | 5.5V max | 5.5V max | 5.5V max |
| Lifecycle Status | Active | Active | Active | Active |
Key Differentiators
- Automotive-catalog qualification (vs SN74LVC374A)
- 5.5V-tolerant inputs with 3.3V core (vs SN74BCT574)
- 32 mA high drive at 3.3V for capacitive buses (vs CD74HC374)
Design Notes
Tie the active-low OE pin to VCC through a 10k pull-up resistor so the 3-state outputs remain high-impedance during power-up. This prevents bus contention while clocks and data lines settle. Assert OE only after the system bus is initialized. All eight outputs share one OE pin, so plan bus release timing accordingly.
With eight outputs switching simultaneously into capacitive bus loads, ground bounce (VOLP) and VOH undershoot (VOHV) become the dominant signal-integrity risks. Place at least one 0.1uF ceramic decoupling capacitor within 5 mm of the VCC/GND pin pair, plus a 2.2-4.7uF bulk cap per register bank. TI provides typical VOLP/VOHV data at VCC = 3.3V, 25C in the SNx4LVC374A datasheet for budgeting.
The device operates from 1.65V to 3.6V but is specified for 2.7V to 3.6V operation; do not rely on performance below 2.7V in timing-critical paths. Inputs tolerate up to 5.5V regardless of VCC, so 5V legacy signals can be captured directly - but verify setup/hold timing at the actual VCC used, since propagation delay increases at lower supply voltage.
Compliance Information
Q1 suffix denotes TI automotive-catalog qualification (AEC-relevant). RoHS/lead-free status per standard TI active-product policy; verify REACH and halogen-free status on the TI product page.
