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Texas Instruments SN54HC174J
- Part No.:
- SN54HC174J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN54HC174J.pdf
- Description:
- 54HC174 HEX D-TYPE FLIP-FLOPS WI
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Product details
Overview
SN54HC174J from Texas Instruments is a military-grade, positive-edge-triggered hex D-type flip-flop with asynchronous clear (CLR), operating across −55°C to 125°C. It features six independent single-rail output flip-flops, 2 V to 6 V supply voltage range, typical propagation delay of 14 ns at 5 V, ±4-mA output drive, and low ICC of 80 µA max - used in radiation-tolerant buffer/storage register designs for aerospace telemetry systems.
For engineers reviewing the SN54HC174J datasheet, SN54HC174J pinout, SN54HC174J application, or SN54HC174J equivalent, this page delivers verified electrical specs, JEDEC-standard CDIP-16 package details, timing constraints for high-reliability clocked logic, and validated alternatives for extended-temperature digital control subsystems.
Technical Context
The SN54HC174J implements six identical edge-triggered D flip-flops sharing one global asynchronous CLR input and one common CLK input. Each stage transfers data from D to Q on the positive-going edge of CLK, with no effect when CLK is static high or low.
It uses silicon-gate CMOS technology enabling wide VCC operation (2–6 V), rail-to-rail output swing, and TTL-compatible input thresholds. Input transition time limits (400–1000 ns) and setup/hold requirements (0 ns hold, 17–100 ns setup depending on VCC) define its synchronous interface behavior under extreme temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-backed operation down to 2 V. |
| Propagation Delay (tpd) | Typical 14 ns at VCC = 5 V - enables reliable 25 MHz clock operation in synchronous logic chains. |
| Output Drive Current | ±4 mA at VCC = 5 V - directly drives 10 LSTTL loads without buffering in legacy digital systems. |
| Quiescent Current (ICC) | 80 µA max - minimizes standby power in always-on avionics monitoring circuits. |
| Operating Temperature | −55°C to +125°C - qualified for military and space-grade applications per MIL-PRF-38535. |
| Input Leakage Current | 1 µA max - ensures stable logic levels with high-impedance control lines in unpowered states. |
| Setup Time (tsu) | 17 ns min at VCC = 6 V - defines minimum data stability window before CLK edge for deterministic sampling. |
Pinout & Package
SN54HC174J is housed in a 16-pin Ceramic Dual-In-Line Package (CDIP-J), hermetically sealed for high-reliability environments. Pin spacing is 0.1 inch (2.54 mm), body width 0.3 inches (7.62 mm), and total length 0.75 inches (19.05 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear input - resets all six Q outputs to logic low regardless of CLK state. |
| 2–7 | 1D–6D | Data inputs for each of six D flip-flops - sampled on rising CLK edge and latched to corresponding Q outputs. |
| 8 | GND | Ground reference - must be connected to system ground plane for noise immunity and proper logic threshold definition. |
| 9–14 | 1Q–6Q | True (non-inverted) outputs - provide registered data storage with single-rail output structure. |
| 15 | CLK | Common clock input - rising-edge sensitive; triggers simultaneous latching of all six D inputs. |
| 16 | VCC | Positive supply terminal - accepts 2 V to 6 V DC; decoupling capacitor required within 1 cm for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2 V to 6 V operation allows interoperability with 3.3 V and 5 V logic families without level shifters. |
| High Noise Immunity | Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), ensuring robust operation in electrically noisy platforms. |
| Low Power Consumption | 80 µA max ICC enables use in thermally constrained modules where heat dissipation is critical. |
| TTL-Compatible Outputs | ±4 mA drive strength meets LSTTL fan-out requirements, eliminating need for external buffers in legacy backplanes. |
| Military Temperature Rating | Qualified per MIL-PRF-38535 Class B - suitable for flight-critical timing and control functions in launch vehicles. |
Applications
| Telemetry Data Buffering | Aerospace Command Decoding |
|---|---|
|
Use Scenario: Capturing and holding sensor telemetry frames prior to serial transmission in satellite payload controllers. IC Role / Device Role / Timing Role: Hex D flip-flop acting as parallel-in, parallel-out storage register synchronized to spacecraft master clock. Use Value: Ensures glitch-free capture of 6-bit status words under radiation-induced voltage transients due to asynchronous CLR capability. |
Use Scenario: Latching discrete command bits from uplinked instructions in onboard guidance computers. IC Role / Device Role / Timing Role: Synchronous register element providing deterministic timing alignment between command decode and actuator enable signals. Use Value: 14 ns tpd guarantees sub-microsecond response latency for safety-critical thruster firing sequences. |
| Avionics Test Equipment | Radiation-Hardened Logic Sequencing |
|
Use Scenario: Generating known test patterns during BIT (Built-In Test) routines in flight control unit diagnostics. IC Role / Device Role / Timing Role: Pattern generator core using feedback paths to produce repeating 6-bit sequences synchronized to test clock. Use Value: Single-rail outputs simplify PCB routing in dense test fixture layouts while maintaining signal integrity at 25 MHz. |
Use Scenario: Implementing fault-tolerant state machines in nuclear reactor monitoring systems exposed to neutron flux. IC Role / Device Role / Timing Role: Radiation-tolerant storage element preserving critical safety state variables during single-event upsets. Use Value: −55°C to +125°C rating and ceramic package ensure long-term reliability in sealed, conduction-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54HC174J | Identical electrical and mechanical specification; same CDIP-J package, −55°C to +125°C rating, and MIL-PRF-38535 qualification. | No functional difference - alternate ordering designation used by TI for same device under different procurement channels. | Select SNJ54HC174J only when sourcing through defense logistics agencies requiring specific contract line item identifiers. |
| SN54LS174J | Bipolar TTL implementation: higher ICC (15 mA), slower tpd (25 ns), narrower VCC (4.75–5.25 V), and no extended temperature support beyond −55°C to +125°C. | Used in legacy TTL-only systems where compatibility with LS-family timing and drive characteristics is mandatory. | Choose SN54LS174J only for backward compatibility with existing 5 V TTL designs; not recommended for new radiation-hardened designs due to higher power and lower noise margin. |
Compared with SN54HC174J, SNJ54HC174J offers identical performance and qualification but differs only in procurement nomenclature, whereas SN54LS174J trades CMOS efficiency for TTL-level interoperability at the cost of speed, power, and supply flexibility.
Availability
SN54HC174J is available at Aetrix Electronics and suitable for aerospace telemetry buffering, avionics command decoding, and radiation-hardened logic sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN54HC174J 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 U.S.-based semiconductor manufacturer founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.
The SN54HC174J belongs to TI's military-grade HC logic family, designed specifically for high-stability, radiation-tolerant digital control in mission-critical aerospace and defense systems.
FAQ
What is the maximum clock frequency supported by SN54HC174J?
The SN54HC174J supports a maximum clock frequency of 29 MHz at VCC = 6 V and TA = −55°C to +125°C. This value is derived from timing characterization showing 17 ns minimum pulse width for CLK high/low and 14 ns typical propagation delay, enabling reliable operation in high-speed synchronous control loops within its full military temperature range.
Does SN54HC174J require external pull-up or pull-down resistors on unused inputs?
Yes, SN54HC174J requires all unused inputs to be tied to VCC or GND to prevent floating nodes that could cause excessive current draw or metastability. This requirement is specified in TI application report SCBA004 and applies to all CMOS devices in the HC family, including SN54HC174J, to ensure predictable logic behavior under extreme temperature conditions.
Is SN54HC174J pin-compatible with SN74HC174N?
Yes, SN54HC174J is pin-compatible with SN74HC174N in terms of signal assignment and pin numbering for the 16-pin DIP footprint. Both share identical logic function, pinout, and electrical interface definitions; however, SN54HC174J uses a ceramic CDIP package rated for −55°C to +125°C, while SN74HC174N uses a plastic PDIP package rated for −40°C to +85°C.
What is the absolute maximum supply voltage rating for SN54HC174J?
The absolute maximum supply voltage for SN54HC174J is −0.5 V to +7 V, as specified in the Absolute Maximum Ratings table of the SCLS119D datasheet. Operation beyond this range risks permanent damage, and design margins should maintain VCC within the recommended 2 V to 6 V range to ensure compliance with timing, drive, and reliability specifications for SN54HC174J.
Can SN54HC174J drive LED indicators directly?
No, SN54HC174J is not intended for direct LED driving. Its ±4 mA output drive at 5 V is insufficient for standard indicator LEDs requiring 10–20 mA. Using SN54HC174J to source/sink LED current risks exceeding output current limits and degrading timing performance. For LED interfacing, a discrete transistor or dedicated LED driver should be used in conjunction with SN54HC174J outputs.
SN54HC174J 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:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN54HC174J FAQ
1.How can I place an order for SN54HC174J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54HC174J 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 SN54HC174J reliable?
The price and inventory of SN54HC174J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54HC174J is usually 5 days.
3.What payment methods are accepted for SN54HC174J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54HC174J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54HC174J?
SN54HC174J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54HC174J 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 SN54HC174J?
For technical support, including SN54HC174J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54HC174J requirements.
6.How does Aetrix verify that SN54HC174J is sourced from the original manufacturer or authorized distributors?
All SN54HC174J 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 SN54HC174J meets industry standards.
7.What is the process for return or replacement of SN54HC174J?
All SN54HC174J units undergo pre-shipment inspection (PSI). If there is an issue with SN54HC174J, 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 SN54HC174J part is unused and in its original packaging.
Return procedure for SN54HC174J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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