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Texas Instruments SN54ALS874BJT
- Part No.:
- SN54ALS874BJT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN54ALS874BJT.pdf
- Description:
- 54ALS874B OCTAL 4-BIT D-TYPE EDG
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
SN54ALS874BJT from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with 3-state noninverting outputs, designed as a bus driver IC for military-grade applications. It features asynchronous clear (CLR), true logic outputs, bus-structured pinout, and operates across −55°C to 125°C. Used in buffer registers and bidirectional bus interfaces in avionics and ruggedized control systems.
For engineers reviewing the SN54ALS874BJT datasheet, SN54ALS874BJT pinout, SN54ALS874BJT application, or SN54ALS874BJT equivalent, this page delivers verified electrical specs, military-temperature timing behavior, 3-state bus driving capability, and direct package-level compatibility with ceramic DIP (JT) sockets.
Technical Context
This device implements two independent 4-bit D-type flip-flop sections, each with separate clock (CLK), clear (CLR), and output-enable (OE) controls. Data is latched on the low-to-high transition of CLK, and outputs enter high-impedance state when OE is high.
The SN54ALS874BJT uses ALS (Advanced Low-Power Schottky) logic technology, delivering 25 MHz maximum clock frequency, 12 mA low-level output drive, and 24 mA peak sink current at VCC = 5.5 V - optimized for noise-immune, high-drive bus interfacing in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances speed and power for military temperature operation |
| Function | Dual 4-bit edge-triggered D flip-flop with 3-state noninverting outputs - enables bidirectional data routing on shared buses |
| Operating Temperature | −55°C to 125°C - qualified for full military temperature range per MIL-PRF-38535 |
| Max Clock Frequency | 25 MHz - supports synchronous data transfer in real-time embedded control subsystems |
| Output Drive | IOL = 12 mA (min), IOH = −1 mA (min) - sufficient to drive multiple TTL loads or terminated transmission lines |
| Propagation Delay | tPLH/tPHL ≤ 18 ns (max) - ensures deterministic timing in critical timing paths |
| Supply Voltage | VCC = 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of supply ripple |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), JT package, 24-pin, 0.3-inch width, hermetically sealable, MIL-STD-1835 compliant. Pin 1 index marked on cap for terminal identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input | Active-low reset for respective 4-bit section - forces Q outputs low independently of clock |
| 1OE, 2OE | Output enable input | Active-low control for 3-state output drivers - disables outputs to high-Z for bus sharing |
| 1CLK, 2CLK | Clock input | Edge-triggered input - data latched on low-to-high transition for synchronous register behavior |
| 1D1–1D4, 2D1–2D4 | Data inputs | Parallel 4-bit data inputs per section - accepts standard TTL-level signals |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting outputs | True logic outputs with 3-state capability - directly drive bus lines without external buffers |
| VCC (Pin 13), GND (Pin 12) | Power supply | Single 5 V supply interface - decoupling required per MIL-STD-1399 for EMI robustness |
Key Features
| Feature | Design Value |
|---|---|
| 3-State buffer-type outputs | Enables direct connection to shared data/address buses without external bus transceivers |
| Bus-structured pinout | Minimizes PCB trace crosstalk and simplifies layout for high-density backplane designs |
| Asynchronous clear (CLR) | Allows immediate register reset without waiting for clock edge - critical for fault recovery |
| Military temperature qualification | Validated operation from −55°C to 125°C - suitable for aerospace, defense, and downhole electronics |
| ALS logic technology | Delivers 2× speed vs. standard LS with comparable power - ideal for legacy 5 V systems requiring upgrade headroom |
Applications
| Avionics Data Bus Interface | Ground Vehicle Control Module |
|---|---|
Use Scenario: Interfacing microcontroller I/O ports to ARINC 429-compatible parallel bus structures in flight control computers. IC Role / Device Role / Timing Role: Dual 4-bit register buffers with 3-state outputs isolate MCU from bus loading while enabling synchronized data capture on clock edge. Use Value: Eliminates need for discrete bus buffers; maintains signal integrity across −55°C to 125°C thermal cycling during aircraft ascent/descent. | Use Scenario: Real-time sensor data aggregation in armored vehicle engine control units exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Synchronizing analog-to-digital converter outputs into a shared diagnostic bus using edge-triggered latching and bus contention prevention. Use Value: Asynchronous CLR allows immediate fault-state clearing; ALS speed supports 25 MHz sampling coordination without timing margin loss. |
| Tactical Radio Baseband Processing | Missile Guidance Signal Conditioning |
Use Scenario: Buffering and retiming digital audio and telemetry streams between FPGA baseband processors and RF modulator ICs. IC Role / Device Role / Timing Role: Dual-register stage providing setup/hold time margin and bus isolation between clock domains. Use Value: 18 ns max propagation delay ensures sub-cycle alignment; 3-state OE supports dynamic bus arbitration in half-duplex radio links. | Use Scenario: Capturing inertial measurement unit (IMU) outputs in guidance computers where radiation tolerance and thermal stability are mandatory. IC Role / Device Role / Timing Role: High-reliability latch for critical navigation data, with CLR enabling safe reinitialization after power-on reset or fault detection. Use Value: Ceramic JT package provides hermetic sealing and low outgassing; military temp rating guarantees operation during rocket motor burn phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit D flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS874BDW | Same ALS logic, identical function and timing, but SOIC-24 plastic package (0°C to 70°C) | Commercial temperature range only; not qualified for military/aerospace deployment | Select for cost-sensitive industrial control where extended temperature is not required |
| SNJ54ALS874BJT | Identical military-spec CDIP (JT) package and electrical characteristics; same 8401001LA marking | No functional difference - SNJ prefix denotes TI's military screening and traceability level | Preferred for programs requiring QML-38535 Class V or Class Q certification documentation |
Compared with SN54ALS874BJT, SN74ALS874BDW trades military temperature range and hermetic packaging for lower cost and surface-mount compatibility, while SNJ54ALS874BJT offers identical performance with enhanced process control documentation for defense prime integrators.
Availability
SN54ALS874BJT is available at Aetrix Electronics and suitable for avionics data bus interfaces, ground vehicle control modules, tactical radio baseband processing, and missile guidance signal conditioning requiring stable component supply under extended temperature and long lifecycle commitments.
Supply support for SN54ALS874BJT 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-reliability logic solutions since 1930.
The SN54ALS874BJT belongs to TI's military-grade ALS logic family, engineered for high-speed, low-power bus interfacing in defense, aerospace, and industrial systems demanding guaranteed operation across extreme temperatures.
FAQ
What is the maximum clock frequency supported by the SN54ALS874BJT?
The SN54ALS874BJT supports a maximum clock frequency of 25 MHz over its full operating temperature range of −55°C to 125°C. This value is validated per the recommended operating conditions and switching characteristics table in the SDAS061C datasheet, measured with CL = 50 pF and R1/R2 = 500 Ω. The SN54ALS874BJT achieves this speed using Advanced Low-Power Schottky (ALS) technology while maintaining military-grade reliability.
Does the SN54ALS874BJT have inverting or noninverting outputs?
The SN54ALS874BJT has noninverting (true) Q outputs. This is explicitly confirmed in the device description: "SN54ALS874B, SN74ALS874B, and SN74AS874 have clear (CLR) inputs and noninverting Q outputs." The SN54ALS874BJT is part of the true-output variant group, distinct from the inverting-output SN74ALS876A series.
What package type is used for the SN54ALS874BJT?
The SN54ALS874BJT uses a ceramic dual-in-line package (CDIP) designated JT - a 24-pin, 0.3-inch wide, hermetically sealable package compliant with MIL-STD-1835 and JEDEC MO-058. Mechanical drawings confirm pin spacing of 0.100 inch, body dimensions of 1.440 × 0.285 inches, and index mark on the ceramic cap for orientation.
Can the SN54ALS874BJT be used in place of the SN74ALS874B in commercial designs?
The SN54ALS874BJT is functionally identical to the SN74ALS874B but rated for −55°C to 125°C versus 0°C to 70°C. Electrically, both share the same pinout, timing, and logic behavior. However, substituting SN54ALS874BJT into a commercial design requires verifying mechanical compatibility (JT vs. DW/NT packages) and assessing whether military-grade cost and screening add value for the application.
What is the purpose of the OE (output enable) pins on the SN54ALS874BJT?
The OE (output enable) pins - 1OE and 2OE - control the 3-state output drivers of each 4-bit section. When OE is low, outputs are active and follow registered Q values; when OE is high, outputs enter high-impedance (Z) state. This enables bus sharing, prevents contention, and supports bidirectional data flow - a core requirement in systems like I/O port expansion and buffer register applications using the SN54ALS874BJT.
SN54ALS874BJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ALS
- Package/Case:
- 24-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Clock Frequency:
- 25 MHz
- Max Propagation Delay @ V, Max CL:
- 18ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 1mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 32 mA
- Input Capacitance:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-CDIP
SN54ALS874BJT FAQ
1.How can I place an order for SN54ALS874BJT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54ALS874BJT 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 SN54ALS874BJT reliable?
The price and inventory of SN54ALS874BJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54ALS874BJT is usually 5 days.
3.What payment methods are accepted for SN54ALS874BJT?
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4.How is shipping managed for SN54ALS874BJT?
SN54ALS874BJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54ALS874BJT 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 SN54ALS874BJT?
For technical support, including SN54ALS874BJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54ALS874BJT requirements.
6.How does Aetrix verify that SN54ALS874BJT is sourced from the original manufacturer or authorized distributors?
All SN54ALS874BJT 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 SN54ALS874BJT meets industry standards.
7.What is the process for return or replacement of SN54ALS874BJT?
All SN54ALS874BJT units undergo pre-shipment inspection (PSI). If there is an issue with SN54ALS874BJT, 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 SN54ALS874BJT part is unused and in its original packaging.
Return procedure for SN54ALS874BJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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