My Inquiry
My Account
Texas Instruments SN74AHC374DBRG4
- Part No.:
- SN74AHC374DBRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHC374DBRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,196
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHC374DBRG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface applications requiring controlled drive strength and high-impedance isolation. It operates from 2 V to 5.5 V, supports 8-bit parallel data latching on CLK rising edge, and delivers ±25 mA output drive per channel with 3.3 V/5 V timing compatibility. It is used in server motherboards for I/O port buffering and bidirectional bus control.
For engineers reviewing the SN74AHC374DBRG4 datasheet, SN74AHC374DBRG4 pinout, SN74AHC374DBRG4 application, or SN74AHC374DBRG4 equivalent, key selection criteria include 3-state enable timing (tPZH/tPLZ ≤ 13.5 ns at 3.3 V), input overvoltage tolerance to 5.5 V, latch-up immunity >250 mA, and SSOP-20 package thermal resistance (RθJA = 97.9°C/W).
Technical Context
The SN74AHC374DBRG4 implements eight independent D-type latches synchronized to the rising edge of CLK, with a shared active-low Output Enable (OE) controlling all eight outputs simultaneously. Its CMOS AHC logic family ensures balanced rise/fall times and low dynamic power consumption (Cpd = 32 pF).
Each channel features rail-to-rail input voltage tolerance (VI = 0 to 5.5 V regardless of VCC), enabling level translation between mixed-voltage domains. The 3-state outputs support high-capacitance bus loading up to 50 pF while maintaining defined propagation delays (tPLH/tPHL ≤ 16.5 ns at 3.3 V, CL = 15 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 3.3 V and 5 V systems without level shifters |
| fMAX (CL = 15 pF) | 70 MHz at 3.3 V - supports high-speed data capture in industrial I/O controllers |
| tPLH / tPHL | ≤16.5 ns at 3.3 V, CL = 15 pF - ensures tight timing margins in synchronous bus architectures |
| IOH / IOL | –4 mA / +4 mA at 3.3 V - provides sufficient drive for TTL-compatible loads without excessive ringing |
| VIH / VIL | 2.1 V / 0.9 V at VCC = 3 V - guarantees noise-immune logic thresholds in noisy embedded environments |
| ESD HBM | 2000 V - meets industrial handling requirements per ANSI/ESDA/JEDEC JS-001 |
| Operating Temp | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood use |
Pinout & Package
SN74AHC374DBRG4 is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.2 mm × 7.8 mm body dimensions, and exposed pad not present. The package is RoHS-compliant, moisture-sensitive level 1, and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low enables all eight Q outputs; high places them in high-impedance state for bus sharing |
| 2–9, 12, 15–16, 19 (Q1–Q8) | 3-state buffered outputs | Reflect D-input states on CLK↑ when OE is low; tri-state otherwise to prevent bus contention |
| 3–4, 7–9, 13–14, 17–18 (D1–D8) | Data inputs | Accept 0–5.5 V logic levels independent of VCC - supports down-translation from 5 V to 3.3 V domains |
| 11 (CLK) | Clock input | Rising-edge triggered; requires monotonic transitions with ∆t/∆v ≤ 100 ns/V at 3.3 V to avoid metastability |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection for signal integrity |
| 20 (VCC) | Power supply | Single supply for core and I/O; requires local 0.1 µF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2 V to 5.5 V operation allows direct integration into mixed-supply systems without external regulators |
| Input overvoltage tolerance | Inputs accept up to 5.5 V regardless of VCC - eliminates need for external clamping diodes in level-shifted interfaces |
| Controlled edge rate | Slow output edges reduce EMI and overshoot on long PCB traces or unterminated buses |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against transient ground bounce or supply glitches |
| Low dynamic power | 32 pF power dissipation capacitance minimizes switching current in high-frequency clocked applications |
Applications
| Server Motherboard I/O Buffering | Industrial Network Switch Interface |
|---|---|
Use Scenario: Isolating CPU-side control signals from peripheral expansion slots while supporting hot-plug detection. IC Role / Device Role / Timing Role: Octal latch synchronizing GPIO configuration writes and enabling/disabling PCIe slot power control lines via OE. Use Value: 3-state outputs prevent back-driving during slot insertion; 125°C rating ensures reliability in thermally dense server chassis. | Use Scenario: Managing bidirectional data flow between MAC controller and PHY transceivers in 10/100 Mbps Ethernet switch fabric. IC Role / Device Role / Timing Role: Bus driver providing direction-controlled data staging between ASIC and magnetics interface. Use Value: Input overvoltage tolerance accommodates 5 V PHY signaling while operating from 3.3 V rail; slow edges suppress crosstalk on dense switch PCBs. |
| Test & Measurement Equipment Data Capture | Motor Control System Register Interface |
Use Scenario: Capturing parallel sensor readings (e.g., ADC outputs) into a microcontroller's memory-mapped I/O space. IC Role / Device Role / Timing Role: Edge-triggered register holding sampled analog front-end data until firmware initiates DMA transfer. Use Value: 70 MHz fMAX supports sampling rates up to 10 MSPS per channel; low setup time (tsu = 4 ns at 3.3 V) enables precise timing alignment. | Use Scenario: Interfacing microcontroller PWM registers to isolated gate drivers in three-phase inverter control boards. IC Role / Device Role / Timing Role: Output register latching duty-cycle commands before sending to optocoupled driver stages. Use Value: ±25 mA drive capability directly sources gate driver enable inputs; 125°C rating matches motor drive ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC574PWRE4 | Same AHC family, TSSOP-20 package, identical logic function and timing specs; differs only in marking and tape/reel packaging | No functional difference - pinout, timing, and DC specs fully matched per TI datasheet SCLS240K | Select when TSSOP-20 footprint and 2000-unit reel are preferred over SSOP-20 |
| 74LVC374APW,118 | Lower VCC range (1.65–3.6 V); faster tPLH (2.5 ns typ at 3.3 V); higher drive (±24 mA); different pinout (OE on pin 1 vs pin 1 on SN74AHC374DBRG4) | Not pin-compatible; requires PCB redesign; suited for 3.3 V-only systems needing higher speed and lower power | Choose only if migrating to LVC family and redesigning layout; not drop-in replacement |
Compared with SN74AHC374DBRG4, SN74AHC574PWRE4 offers identical electrical behavior in a different package, while 74LVC374APW,118 trades wider voltage range and pin compatibility for higher speed and lower voltage operation - making it suitable only for new designs targeting 3.3 V domains.
Availability
SN74AHC374DBRG4 is available at Aetrix Electronics and suitable for server motherboard design, industrial network switch development, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC374DBRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience delivering high-reliability components for industrial, automotive, and communications infrastructure.
The SN74AHC374DBRG4 belongs to TI's AHC logic family, engineered for robust mixed-voltage interfacing, low-noise bus driving, and extended-temperature operation in mission-critical embedded control systems.
FAQ
What is the maximum clock frequency supported by SN74AHC374DBRG4 at 3.3 V?
The SN74AHC374DBRG4 supports a maximum clock frequency of 70 MHz when loaded with 15 pF and operated at VCC = 3.3 V ± 0.3 V, as specified in Section 5.8 of the TI datasheet SCLS240K. This value drops to 50 MHz at 50 pF load due to increased propagation delay. The SN74AHC374DBRG4 maintains reliable operation within these limits across its full –40°C to +125°C temperature range.
Does SN74AHC374DBRG4 support 5 V logic inputs while powered from a 3.3 V supply?
Yes, SN74AHC374DBRG4 supports 5 V-tolerant inputs - all D and OE pins accept voltages up to 5.5 V regardless of VCC level. This allows direct interfacing with 5 V microcontrollers or peripherals while SN74AHC374DBRG4 operates from a 3.3 V rail, eliminating external level-shifting circuitry in mixed-voltage systems.
What is the purpose of the OE pin on SN74AHC374DBRG4 and how is it used?
The OE (Output Enable) pin on SN74AHC374DBRG4 is an active-low control that globally enables or disables all eight Q outputs. When OE is low, outputs reflect latched D-input values; when OE is high, all outputs enter high-impedance state. This allows SN74AHC374DBRG4 to share data buses without contention, making it ideal for bidirectional I/O port applications.
Can SN74AHC374DBRG4 be used in automotive under-hood applications?
SN74AHC374DBRG4 is rated for operation from –40°C to +125°C and meets JESD17 latch-up immunity (>250 mA), making it suitable for many automotive under-hood applications. However, it is not AEC-Q100 qualified. For production automotive use, designers should verify system-level qualification testing and consult TI's automotive-grade alternatives if formal qualification is required.
What decoupling capacitance is recommended for SN74AHC374DBRG4?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (pin 20) of SN74AHC374DBRG4 to suppress high-frequency noise. For systems with multiple power domains or stringent EMI requirements, paralleling a 1 µF capacitor is acceptable - but the 0.1 µF unit must remain adjacent to the IC to ensure effective local decoupling of the SN74AHC374DBRG4's switching currents.
SN74AHC374DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 120 MHz
- Max Propagation Delay @ V, Max CL:
- 10.1ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74AHC374DBRG4 FAQ
1.How can I place an order for SN74AHC374DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC374DBRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74AHC374DBRG4 reliable?
The price and inventory of SN74AHC374DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC374DBRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC374DBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC374DBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC374DBRG4?
SN74AHC374DBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC374DBRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74AHC374DBRG4?
For technical support, including SN74AHC374DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC374DBRG4 requirements.
6.How does Aetrix verify that SN74AHC374DBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC374DBRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AHC374DBRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC374DBRG4?
All SN74AHC374DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC374DBRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74AHC374DBRG4 part is unused and in its original packaging.
Return procedure for SN74AHC374DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHC374DBRG4 Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
