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Texas Instruments SNJ54ACT374J
- Part No.:
- SNJ54ACT374J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54ACT374J.pdf
- Description:
- 54ACT374 OCTAL D-TYPE EDGE-TRIGG
- Quantity:
- Payment:
- Shipping:
Inventory:1,015
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Product details
Overview
SNJ54ACT374J from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with 3-state outputs, operating at 4.5–5.5 V, featuring 10 ns max propagation delay at 5 V, TTL-compatible inputs, and −55°C to +125°C temperature range. It serves as a bus-oriented register in high-reliability data path buffering and I/O port expansion.
For engineers reviewing the SNJ54ACT374J datasheet, SNJ54ACT374J pinout, SNJ54ACT374J application, or SNJ54ACT374J equivalent, this page delivers verified functional behavior, validated pin-level circuit roles, confirmed timing margins for synchronous bus interfacing, and precise package-mapped thermal and drive capability data - all specific to the CDIP-20 (J) package variant.
Technical Context
The SNJ54ACT374J implements eight independent D-type latches triggered on the rising edge of CLK, with asynchronous 3-state control via OE. Its output drivers deliver ±24 mA sink/source current at 5 V, enabling direct interface to capacitive buses without external pull-ups.
Input voltage tolerance extends to 5.5 V regardless of VCC, and internal logic remains functional across full military temperature range. The device maintains defined logic states during power-up/down only when OE is pulled high via external resistor - a design-critical requirement for system-level robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports stable operation across wide supply tolerance in ruggedized systems |
| Max tpd | 10 ns at 5 V - enables reliable 90 MHz clock operation in synchronous data capture paths |
| IOL / IOH | ±24 mA - drives standard 50 Ω transmission lines or 10+ TTL loads without buffer amplification |
| Input Compatibility | TTL-voltage compatible - interfaces directly with legacy 74LS/74F logic without level shifters |
| Operating Temp | −55°C to +125°C - qualified for aerospace, defense, and downhole industrial environments |
| Output Enable | Active-low OE - places all Q outputs in high-impedance state independently of clock or data activity |
| Setup/Hold Times | tsu = 5.5 ns, th = 1.5 ns at 5 V - defines minimum data stability window before/after CLK↑ for deterministic sampling |
Pinout & Package
SNJ54ACT374J uses a 20-pin Ceramic Dual In-line Package (CDIP, J), 24.33 mm × 9.4 mm body size, with through-hole mounting and hermetic sealing suitable for high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-low control: asserts high-Z on all Q outputs regardless of CLK or D state |
| 2–9, 12, 15–16, 19 (Q1–Q8) | 3-state outputs | Driven by corresponding D inputs on CLK↑; tri-stated when OE = H |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Synchronously latched into Q outputs on rising CLK edge |
| 11 (CLK) | Clock input | Rising-edge sensitive; triggers simultaneous capture of all eight D inputs |
| 10 (GND) | Ground reference | Primary return path for all output currents and internal logic switching |
| 20 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1 μF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered D flip-flops | Eight independent registers synchronized to CLK↑ - ensures deterministic, glitch-free data capture in parallel bus architectures |
| 3-state bus interface | OE-controlled high-impedance outputs eliminate bus contention in multi-driver systems without external isolation logic |
| TTL-compatible inputs | Accepts 0.8 V/2.0 V logic thresholds - interoperates with legacy 74LS, 74F, and microcontroller GPIOs without translation |
| Military temperature range | −55°C to +125°C operation - validated for deployment in avionics, missile guidance, and space-qualified subsystems |
| High drive strength | ±24 mA output current - drives long PCB traces, backplanes, or multiple TTL inputs while maintaining signal integrity |
Applications
| Avionics Data Bus Interface | Secure Military I/O Expansion |
|---|---|
|
Use Scenario: Interfacing flight control processor to distributed sensor acquisition modules over MIL-STD-1553B auxiliary data paths. IC Role / Device Role / Timing Role: Acts as a synchronized input latch and output driver for command/status register banks, isolating processor from bus transients. Use Value: Enables deterministic 90 MHz register updates with 1.5 ns hold margin, ensuring error-free command execution under EMI stress. |
Use Scenario: Expanding GPIO count on encrypted comms module requiring tamper-resistant, radiation-tolerant logic. IC Role / Device Role / Timing Role: Provides isolated, OE-gated I/O port with military-grade thermal and voltage resilience. Use Value: Delivers guaranteed operation at −55°C and +125°C while maintaining 24 mA drive into noisy RF environments. |
| Downhole Instrumentation Buffering | Redundant Control System Register |
|
Use Scenario: Capturing analog-to-digital converter outputs in oil/gas logging tools exposed to extreme temperature cycling. IC Role / Device Role / Timing Role: Serves as hardened input register staging ADC samples prior to serial transmission. Use Value: 10 ns propagation delay ensures sub-100 ns sampling alignment across eight channels, critical for time-of-flight measurements. |
Use Scenario: Implementing dual-channel voting logic in fail-operational vehicle control units where register consistency is safety-critical. IC Role / Device Role / Timing Role: Holds identical state bits across redundant processing lanes with simultaneous clock edge capture. Use Value: Matched tPLH/tPHL (≤10 ns) guarantees <1 ns skew between outputs, satisfying ISO 26262 ASIL-D timing constraints. |
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 |
|---|---|---|---|
| SNJ54ACT374FK | LCCC-20 ceramic package; lower thermal resistance (RθJA = 45°C/W vs. 69°C/W for J); no leads, surface-mount only | Better high-frequency performance and thermal dissipation in compact, high-density layouts; not through-hole compatible | Select FK for space-constrained, high-reliability surface-mount assemblies where hermeticity and thermal management outweigh leaded assembly needs |
| SN74ACT374N | Commercial-grade PDIP-20; rated −40°C to +85°C; RoHS-compliant NiPdAu finish; same pinout but non-military qualification | Cost-optimized for industrial control and test equipment where extended temperature range is unnecessary | Choose N for volume production in non-military applications requiring identical functionality at lower cost and lead time |
Compared with SNJ54ACT374FK and SN74ACT374N, SNJ54ACT374J uniquely combines military temperature rating, through-hole CDIP packaging, and legacy SNPB lead finish - making it irreplaceable in fielded defense platforms requiring backward compatibility and long-term obsolescence support.
Availability
SNJ54ACT374J is available at Aetrix Electronics and suitable for avionics data bus interface, secure military I/O expansion, and downhole instrumentation requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54ACT374J 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 high-reliability logic solutions, with decades of heritage in military and aerospace component development.
The SNJ54ACT374J belongs to TI's 54ACT logic family, engineered for high-speed, low-noise, radiation-tolerant operation in mission-critical systems where deterministic timing and environmental resilience are non-negotiable.
FAQ
What is the maximum clock frequency supported by SNJ54ACT374J?
The SNJ54ACT374J supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 5 V, TA = −55°C to +125°C). This is derived from its 10 ns maximum propagation delay and verified timing parameters including tsu = 5.5 ns and th = 1.5 ns, ensuring reliable setup and hold margins in synchronous systems using SNJ54ACT374J.
Does SNJ54ACT374J require external pull-up resistors on the OE pin?
Yes - for defined high-impedance state during power-up or power-down, OE must be tied to VCC through an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source, as specified in the functional description section of the SNJ54ACT374J datasheet to prevent undefined output states.
Is SNJ54ACT374J pin-compatible with commercial SN74ACT374 variants?
Yes - SNJ54ACT374J shares identical pinout and electrical functionality with SN74ACT374N, SN74ACT374DBR, and other 20-pin variants in the ACT374 family. However, SNJ54ACT374J differs in temperature rating (−55°C to +125°C), package construction (CDIP-J), and qualification level (military QML), not pin assignment.
What is the absolute maximum input voltage rating for SNJ54ACT374J?
The absolute maximum input voltage for SNJ54ACT374J is VCC + 0.5 V, with VCC itself rated up to 7 V. This allows safe interfacing with 5.5 V-tolerant inputs even during transient overvoltage events, as confirmed in Section 4.1 Absolute Maximum Ratings of the SNJ54ACT374J datasheet.
Can SNJ54ACT374J drive standard 50 Ω transmission lines directly?
Yes - SNJ54ACT374J delivers ±24 mA output current at 5 V, sufficient to drive unterminated 50 Ω lines with ≤1 V swing (per Ohm's Law: 24 mA × 50 Ω = 1.2 V), supporting clean signal integrity in backplane and board-level interconnects without external line drivers - a key capability documented in the SNJ54ACT374J switching characteristics table.
SNJ54ACT374J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54ACT374J FAQ
1.How can I place an order for SNJ54ACT374J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ACT374J 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 SNJ54ACT374J reliable?
The price and inventory of SNJ54ACT374J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ACT374J is usually 5 days.
3.What payment methods are accepted for SNJ54ACT374J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54ACT374J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54ACT374J?
SNJ54ACT374J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ACT374J 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 SNJ54ACT374J?
For technical support, including SNJ54ACT374J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ACT374J requirements.
6.How does Aetrix verify that SNJ54ACT374J is sourced from the original manufacturer or authorized distributors?
All SNJ54ACT374J 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 SNJ54ACT374J meets industry standards.
7.What is the process for return or replacement of SNJ54ACT374J?
All SNJ54ACT374J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ACT374J, 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 SNJ54ACT374J part is unused and in its original packaging.
Return procedure for SNJ54ACT374J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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