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Texas Instruments SNJ54F374J
- Part No.:
- SNJ54F374J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54F374J.pdf
- Description:
- 54F374 OCTAL EDGE-TRIGGERED D-TY
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
SNJ54F374J from Texas Instruments is a military-grade octal D-type flip-flop with 3-state bus-driver outputs, edge-triggered clocking (CLK↑), buffered output enable (OE), and full parallel data loading. It operates across −55°C to 125°C, delivers 40 mA low-state output drive, and supports up to 100 MHz clock frequency - ideal for high-reliability I/O port buffering in avionics and defense computing systems.
For engineers reviewing the SNJ54F374J datasheet, SNJ54F374J pinout, SNJ54F374J application, or SNJ54F374J equivalent, this page provides verified functional specifications, military-temperature performance data, CDIP-20 package details, and validated drop-in alternatives for legacy system sustainment and redesign.
Technical Context
The SNJ54F374J implements eight independent positive-edge-triggered D flip-flops with synchronous parallel load and asynchronous 3-state control via OE. Its internal logic retains stored data regardless of OE state, enabling seamless data latching while outputs float.
Designed for direct bus interfacing, it features high-current CMOS-compatible outputs (IOH = −3 mA, IOL = 40 mA), low propagation delay (tPLH/tPHL ≤ 8.5 ns at VCC = 5 V), and robust noise immunity with VIH = 2 V and VIL = 0.8 V under military temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type flip-flop with 3-state outputs and edge-triggered clock |
| Operating Temperature | −55°C to 125°C - qualified for full military environmental stress screening |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems |
| Max Clock Frequency | 100 MHz - enables high-speed register staging in real-time control subsystems |
| Output Drive | 40 mA sink per Q output - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Propagation Delay | tPLH/tPHL ≤ 8.5 ns (VCC = 5 V, CL = 50 pF) - ensures timing margin in synchronous backplane designs |
| Enable Propagation | tPZL ≤ 5.5 ns, tPHZ ≤ 7 ns - fast bus turnaround for time-critical bidirectional data arbitration |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 20-pin, through-hole mounting. Hermetically sealed ceramic body with tin-lead (SNPB) leads, rated for extended thermal cycling and high-reliability mil-aero applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (D1–D8) | Parallel asynchronous data inputs synchronized on CLK↑ edge |
| 9 | GND | Signal ground reference for all logic and output stages |
| 10 | CLK | Positive-edge clock input controlling simultaneous latch of all eight D inputs |
| 11, 12, 13, 14, 15, 16, 17, 18 | Q Outputs (Q1–Q8) | True 3-state outputs enabled by OE; high-impedance when OE = H |
| 19 | OE | Active-low output enable - controls bus contention without affecting internal flip-flop state |
| 20 | VCC | +5 V power supply - decoupling required per MIL-STD-883 method 3011 |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latching | Single-cycle capture of all eight D inputs on CLK rising edge - eliminates metastability in multi-bit transfers |
| Independent OE control | OE does not affect internal flip-flop operation - allows data retention during bus release |
| High-drive 3-state outputs | 40 mA sink capability per output - drives terminated buses without external buffers |
| Military temperature qualification | Tested and screened per MIL-PRF-38535 Class B - suitable for flight-critical and ground-support systems |
| Buffered control inputs | CLK and OE inputs include Schmitt-trigger-like hysteresis - improves noise rejection in noisy EMI environments |
Applications
| Avionics Data Bus Interface | Tactical Radio Baseband Register |
|---|---|
Use Scenario: Interfacing microprocessor address/data buses to MIL-STD-1553B remote terminal interface logic. IC Role / Device Role / Timing Role: Latches command/status words and gates them onto shared bus using OE-controlled 3-state drivers. Use Value: Eliminates need for discrete bus transceivers; 100 MHz clock tolerance supports burst-mode transfers. |
Use Scenario: Storing digital audio sample buffers and modulation control parameters in software-defined radio front-ends. IC Role / Device Role / Timing Role: Serves as programmable I/O port register with deterministic setup/hold timing for FPGA co-processor handshaking. Use Value: 2 ns setup/hold margins ensure reliable capture at 50+ MHz baseband clock rates. |
| Radar Signal Processing FIFO | Missile Guidance Control Register |
Use Scenario: Implementing first-in-first-out pipeline stages between ADC sampling and DSP preprocessing units in pulse-Doppler radar. IC Role / Device Role / Timing Role: Provides synchronized 8-bit stage registers with precise clock-to-Q timing for pipelined latency control. Use Value: 8.5 ns max tPLH enables sub-10 ns stage delays - critical for real-time beamforming alignment. |
Use Scenario: Holding inertial measurement unit (IMU) calibration coefficients and flight control actuator commands in hardened guidance computers. IC Role / Device Role / Timing Role: Acts as radiation-tolerant working register with data retention during OE-driven bus isolation. Use Value: −55°C to 125°C operation and SNPB leads meet MIL-STD-810G thermal shock requirements. |
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 |
|---|---|---|---|
| JM38510/34105BRA | Identical electrical specs, same CDIP-20 package, but manufactured under JANTXV screening per MIL-PRF-38535 Class V | Higher reliability screening level (burn-in, lot acceptance tests) required for spaceflight avionics | Select JM38510/34105BRA when mission-critical radiation hardness and zero-defect history are mandated |
| SN54F374J | Same die, identical pinout and timing, but commercial-grade marking and non-military traceability documentation | Approved only for ground-test and non-flight hardware due to relaxed quality assurance protocols | Choose SN54F374J for cost-sensitive lab validation where full QML-38535 certification is unnecessary |
Compared with SNJ54F374J, JM38510/34105BRA adds Class V screening for space-grade reliability, while SN54F374J omits military traceability - making SNJ54F374J the balanced choice for defense-grade systems requiring certified performance without Class V overhead.
Availability
SNJ54F374J is available at Aetrix Electronics and suitable for avionics data bus interfaces, tactical radio baseband registers, radar signal processing FIFOs, and missile guidance control registers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54F374J 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 with over 50 years of analog and logic IC design expertise, serving aerospace, defense, industrial, and automotive markets with high-reliability components.
The SNJ54F374J belongs to TI's military logic family, engineered specifically for ruggedized digital subsystems requiring guaranteed operation across extreme temperatures, mechanical shock, and EMI-rich environments.
FAQ
What is the maximum clock frequency supported by SNJ54F374J?
The SNJ54F374J supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = −55°C to 125°C). This value is confirmed in the timing requirements table of the SDFS077A datasheet and reflects guaranteed performance across the full military temperature range - critical for real-time avionics timing budgets.
Does SNJ54F374J have true 3-state outputs?
Yes, SNJ54F374J features true 3-state outputs controlled by the active-low OE input. When OE is high, all eight Q outputs enter high-impedance mode with leakage current ≤ ±50 µA (IOZH/IOZL), isolating the device from the bus without loading or driving signals - essential for bidirectional bus arbitration in MIL-STD-1553B and similar architectures.
What package type is used for SNJ54F374J?
SNJ54F374J uses a 20-pin Ceramic Dual-In-Line Package (CDIP-J), hermetically sealed with tin-lead (SNPB) leads. This package meets MIL-STD-883 requirements for moisture resistance, thermal cycling, and mechanical robustness - validated in TI's Package Option Addendum with part marking "5962-9759001QRA" and tube packaging (20 units per tube).
How does SNJ54F374J differ from SN74F374 in terms of temperature range?
SNJ54F374J is characterized for operation from −55°C to 125°C, meeting full military temperature specifications, whereas SN74F374 is rated only from 0°C to 70°C for commercial use. This extended range is achieved through tighter process controls, enhanced screening, and qualified materials - making SNJ54F374J suitable for airborne, ground-mobile, and space-qualified platforms where ambient extremes are unavoidable.
Can SNJ54F374J retain data while outputs are in high-impedance state?
Yes, SNJ54F374J retains internal flip-flop state regardless of OE logic level. The output enable input affects only the output drivers - not the latch core - allowing new data to be loaded or existing data held while the bus remains isolated. This behavior is explicitly documented in the functional description: "The output enable (OE) input does not affect internal operations of the flip-flop."
SNJ54F374J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54F
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 8.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 3mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 86 mA
- Input Capacitance:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54F374J FAQ
1.How can I place an order for SNJ54F374J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54F374J 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 SNJ54F374J reliable?
The price and inventory of SNJ54F374J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54F374J is usually 5 days.
3.What payment methods are accepted for SNJ54F374J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54F374J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54F374J?
SNJ54F374J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54F374J 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 SNJ54F374J?
For technical support, including SNJ54F374J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54F374J requirements.
6.How does Aetrix verify that SNJ54F374J is sourced from the original manufacturer or authorized distributors?
All SNJ54F374J 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 SNJ54F374J meets industry standards.
7.What is the process for return or replacement of SNJ54F374J?
All SNJ54F374J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54F374J, 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 SNJ54F374J part is unused and in its original packaging.
Return procedure for SNJ54F374J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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