SN74LVC374A-Q1 - Octal D Flip-Flop, 3-State | Texas Instruments
MPN: SN74LVC374A-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
Drop-in alternatives for SN74LVC374A-Q1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LVC374A
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC374A-EP
β Drop-Inπ Reference alternative (not in catalog)
SN54LVC374A
β Drop-Inπ Reference alternative (not in catalog)
74LVC374AD
β Drop-Inπ Reference alternative (not in catalog)
CD74HC374
β‘ Same Packageβ In Stock
$0.28 / Unit
View Datasheet βSN74LVC374A-Q1 Maximum Ratings & Electrical Characteristics
| Logic Function | Octal edge-triggered D-type flip-flop with 3-state outputs |
| Supply Voltage (VCC) | 1.65 V to 3.6 V |
| Recommended Operating VCC | 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 |
| Max Operating Frequency | Up to 100 MHz (high-speed applications) |
| Output Type | 3-state |
| Clock Trigger | Rising edge (positive edge-triggered) |
| Output Enable | OE active-low, common to all 8 outputs |
| Propagation Delay (tpd) | [DATA_NEEDED: max tpd at 3.3V] |
| VOLP (Ground Bounce) | Typical at VCC = 3.3V, 25C per TI datasheet |
| VOHV (Output VOH Undershoot) | Typical at VCC = 3.3V, 25C per TI datasheet |
| Automotive Qualification | Q1 automotive catalog |
| Operating Temperature | [DATA_NEEDED: range] |
| Package | SOIC-20 (DW), TSSOP-20 (PW), other options per orderable addendum |
| Mounting Type | Surface Mount |
| RoHS Status | [DATA_NEEDED: RoHS status] |
SN74LVC374A-Q1 Pin Configuration
| Pin 1 | OE β Output enable, active-low, controls all 8 outputs |
| Pin 2 | 1D β Data input 1 |
| Pin 3 | 2D β Data input 2 |
| Pin 4 | 3D β Data input 3 |
| Pin 5 | 4D β Data input 4 |
| Pin 6 | 5D β Data input 5 |
| Pin 7 | 6D β Data input 6 |
| Pin 8 | 7D β Data input 7 |
| Pin 9 | 8D β Data input 8 |
| Pin 10 | GND β Ground |
| Pin 11 | CP β Clock pulse input, rising-edge triggered |
| Pin 12 | 1Q β 3-state output 1 |
| Pin 13 | 2Q β 3-state output 2 |
| Pin 14 | 3Q β 3-state output 3 |
| Pin 15 | 4Q β 3-state output 4 |
| Pin 16 | 5Q β 3-state output 5 |
| Pin 17 | 6Q β 3-state output 6 |
| Pin 18 | 7Q β 3-state output 7 |
| Pin 19 | 8Q β 3-state output 8 |
| Pin 20 | VCC β Supply voltage, 1.65V to 3.6V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74LVC374A-Q1 is suitable for 6 applications: Automotive Bus Interface, Data Latching and Retention, Register Banks in Industrial Control, Memory Address and Data Buffering, Automotive Infotainment and Display Control, Test and Measurement Instrumentation.
Automotive Bus Interface
In automotive ECUs and body-control modules, the SN74LVC374A-Q1 latches 8-bit data onto shared 3-state buses. Its Q1 automotive-catalog qualification addresses reliability expectations for vehicle environments, while 5.5V-tolerant inputs safely interface legacy 5V signals on mixed-voltage boards. With 32 mA drive at 3.3V it handles highly capacitive harness-side or transceiver-front-end loads without external buffers, and the active-low OE pin lets the MCU disconnect the register from the bus during startup or fault conditions, preventing bus contention on shared CAN/LIN-adjacent signal lines.
Recommended
Data Latching and Retention
The core use case for the SN74LVC374A-Q1 is retaining 8-bit parallel data: data present on the D inputs is captured on the rising edge of the clock and held at the 3-state outputs until the next edge. According to TI's SNx4LVC374A literature, the device is intended for bus-interface applications where data needs to be retained or latched, operating up to 100 MHz. The low VOLP ground-bounce performance at 3.3V keeps simultaneous-switching noise low when all eight outputs switch together, protecting timing margins on long bus traces.
Recommended
Register Banks in Industrial Control
In PLCs and industrial automation controllers, multiple SN74LVC374A-Q1 devices form status or output register banks. The wide 1.65V to 3.6V supply range supports both 1.8V and 3.3V logic domains, and the 5.5V-tolerant inputs allow direct connection to 5V sensor or legacy-field signals through minimal conditioning. Each octal device's common clock enables synchronized capture of parallel status words, while the 3-state outputs permit multiple registers to time-share a common data bus, reducing interconnect density on crowded industrial control boards.
Recommended
Memory Address and Data Buffering
When interfacing microcontrollers to external parallel memories or FPGAs, the SN74LVC374A-Q1 pipelines address or data bytes to meet setup-and-hold timing. Its up-to-100 MHz operation covers typical parallel memory clock rates, and the 32 mA drive at 3.3V sustains signal integrity across heavily loaded address lines with several memory devices attached. The 3-state outputs let a single bus serve both read and write phases, with the OE pin gating the register onto the bus only during the appropriate phase, simplifying bus arbitration logic.
Recommended
Automotive Infotainment and Display Control
Automotive display and infotainment backplanes use SN74LVC374A-Q1 registers to latch panel-control and backlight-status words. The Q1 qualification supports the automotive program requirement, and the low output undershoot (VOHV) specification at 3.3V helps protect downstream LED-driver enable inputs from undershoot stress during simultaneous switching. The clocked 8-bit structure provides deterministic single-edge updates of display control lines, avoiding glitches that asynchronous latches can introduce during panel bring-up, while the OE pin safely blanks outputs during power sequencing.
Recommended
Test and Measurement Instrumentation
Bench instruments and automated test equipment use SN74LVC374A-Q1 devices to latch relay-control words, trigger flags, and status readbacks. The 3.3V operation with 5.5V-tolerant inputs simplifies interfacing to heterogeneous subsystems, and the ability to drive relatively low-impedance loads eliminates extra buffering on relay-coil driver inputs. Because all eight outputs update on one clock edge, test sequences remain precisely correlated, which matters for timing-sensitive stimulus generation, while the 3-state feature lets a host controller take over shared control lines during diagnostics.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVC374A-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVC374A | SN74LVC374A-EP | 74LVC374AD | CD74HC374 |
|---|---|---|---|---|---|
| Package | SOIC-20 (DW) / TSSOP-20 (PW) | SOIC-20 (DW) - same | SOIC-20 (DW) - same | SOIC-20 - same pinout | SOIC-20 - same pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia | Texas Instruments |
| Supply Voltage Range | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 2 V to 6 V |
| Automotive Qualification | Yes (Q1) | No | Enhanced product (non-Q1) | [DATA_NEEDED] | No |
| Output Drive | 32 mA at 3.3 V | 32 mA at 3.3 V | 32 mA at 3.3 V | [DATA_NEEDED] | [DATA_NEEDED] |
| Input Tolerance | 5.5 V tolerant inputs | 5.5 V tolerant inputs | 5.5 V tolerant inputs | 5.5 V tolerant inputs | VCC-limited (up to 6V rail) |
| Output Type | 3-state | 3-state | 3-state | 3-state | 3-state |
| Speed Class | Up to 100 MHz | Up to 100 MHz | Up to 100 MHz | LVC speed class (similar) | Slower HC speed class |
Key Differentiators
- Automotive-catalog (Q1) qualification (vs SN74LVC374A)
- 5.5V-tolerant inputs on a 1.65V to 3.6V core (vs CD74HC374)
- High-drive 3-state outputs for capacitive buses (vs 74LVC374AD)
Design Notes
The SN74LVC374A-Q1 drives 32 mA at 3.3V with fast LVC-class edge rates. When all eight outputs switch simultaneously on a shared bus, ground bounce (VOLP) increases; TI datasheet characterization at VCC = 3.3V, 25C quantifies this. Minimize bounce by distributing ground returns across the GND pin, keeping bus trace stubs short, and adding 22-33 ohm series termination resistors at outputs driving heavily capacitive loads.
Decouple VCC with a 100 nF ceramic capacitor placed within 5 mm of pin 20, plus a bulk 4.7-10 uF capacitor per board region. LVC-class devices draw dynamic crowbar current at fast input edges, so a low-inductance ground return at pin 10 is equally important. Because inputs are 5.5V tolerant even at VCC = 1.65V, ensure the input rail never back-powers the device during 3.3V-rail sequencing faults.
Do not leave the OE pin floating. An undriven OE can leave the 3-state outputs in an undefined state, causing bus contention on shared lines. Use a pull-up resistor (10k to VCC) so outputs default to high-impedance at power-up, and release the bus only after the clock is stable. Also confirm clock setup-and-hold timing at your VCC corner from the datasheet timing table, since parameters scale with supply voltage.
For automotive layouts, place the flip-flop close to its bus connector to reduce stub length, route the CP (clock) line away from D inputs to avoid crosstalk-triggered false clocking, and use a solid ground plane. If using the TSSOP-20 (PW) variant, the fine 0.65 mm pitch requires solder-mask-defined pads per IPC-recommended land patterns; verify the TI orderable addendum for the exact mechanical drawing of your package suffix.
Compliance Information
Q1 suffix denotes TI automotive-catalog qualification. RoHS/REACH/lead-free status not stated in the provided verified data - confirm on the TI product page.
