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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SNJ54AHC273W

Name: SNJ54AHC273W
Brand: Texas Instruments
SKU: SNJ54AHC273W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SNJ54AHC273W

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SNJ54AHC273W.pdf

Description:: 54AHC273 OCTAL D-TYPE FLIP-FLOPS

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Product details

Overview

SNJ54AHC273W from Texas Instruments is a military-grade octal D-type positive-edge-triggered flip-flop with asynchronous clear, operating from 2 V to 5.5 V, supporting −55 °C to +125 °C temperature range, and featuring 5.5-V-tolerant inputs for mixed-voltage down-translation in aerospace and defense systems.

For engineers reviewing the SNJ54AHC273W datasheet, SNJ54AHC273W pinout, SNJ54AHC273W application, or SNJ54AHC273W equivalent, this page delivers verified electrical specs (t_su = 4.5 ns @ 5 V), thermal metrics (R_θJA = 81.1 °C/W), ESD ratings (±2000 V HBM), package dimensions (CFP-20, 12.8 mm × 10.3 mm body), and functional mode truth table per TI SCLS376J Rev J.

Technical Context

This device implements eight independent D-type latches synchronized to the rising edge of CLK, with a dedicated active-low CLR input that overrides clock and data. Each flip-flop has separate D input and Q output, enabling parallel data capture without internal bus contention.

It uses advanced CMOS AHC logic with balanced drive strength (±8 mA @ 5 V), slow edge-rate control to suppress output ringing, and 5.5-V-tolerant inputs-allowing direct interfacing with legacy 5-V logic while powered from 3.3-V or 2.5-V rails in hybrid signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2 V to 5.5 V - supports single-supply operation across 2.5-V, 3.3-V, and 5-V system domains
Operating Temperature	−55 °C to +125 °C - qualified per MIL-PRF-38535 for extended military and space applications
t_su (Setup Time)	4.5 ns @ V_CC = 5 V - defines minimum D-input stability window before CLK rising edge
f_max	165 MHz @ CL = 15 pF, V_CC = 5 V - maximum reliable toggle frequency under light capacitive load
I_OL/I_OH	±8 mA @ V_CC = 5 V - output drive capability sufficient for driving 50-Ω transmission lines or multiple 74-AHC inputs
ESD Rating	±2000 V HBM - meets JEDEC JS-001 for robust handling in controlled manufacturing environments
Input Voltage Tolerance	Up to 5.5 V regardless of V_CC - enables safe 5-V-to-3.3-V level translation without external resistors or translators

Pinout & Package

SNJ54AHC273W is supplied in CFP (W) package: 20-pin ceramic flatpack, 12.80 mm × 10.3 mm body size, with gull-wing leads and metal lid hermetic seal for high-reliability mil-aero use.

Pin/Terminal	Circuit Role	Design Meaning
1	CLR	Asynchronous active-low clear - forces all Q outputs low independently of CLK or D inputs
2	1Q	Output for first flip-flop - reflects stored state of 1D on prior CLK↑
3	1D	Data input for first flip-flop - sampled only on CLK rising edge if t_su/t_h met
4–9	2D–4Q	Paired D/Q terminals for flip-flops 2–4 - fully independent, no shared control beyond CLK/CLR
10	GND	Ground reference - must be low-impedance connection for noise immunity and timing integrity
11	CLK	Positive-edge clock - triggers simultaneous sampling of all eight D inputs
12–19	5Q–8D	Paired D/Q terminals for flip-flops 5–8 - identical timing and drive behavior as pins 2–9
20	V_CC	Power supply - bypass capacitor (0.1 µF) required adjacent to pin for stable switching

Key Features

Feature	Design Value
Wide V_CC range (2–5.5 V)	Enables interoperability across legacy 5-V and modern low-voltage subsystems without level shifters
5.5-V-tolerant inputs	Permits direct connection to 5-V microcontrollers or FPGAs while operating at 3.3 V or lower
Slow edge-rate control	Reduces EMI and output ringing in high-speed digital backplanes and avionics I/O interfaces
MIL-PRF-38535 compliance	Guarantees screening, testing, and traceability for mission-critical defense electronics programs
Low dynamic power (C_pd = 31 pF)	Minimizes switching current and heat generation in thermally constrained embedded modules

Applications

Avionics Data Acquisition	Secure Military Communication
Use Scenario: Capturing synchronized sensor data (e.g., inertial measurement unit outputs) in flight control computers where deterministic timing and radiation tolerance are critical. IC Role / Device Role / Timing Role: Octal register holding parallel analog-to-digital converter outputs until processed by a rad-hard FPGA; CLR used for cold-start reset. Use Value: Guaranteed t_su ≤ 4.5 ns and −55 °C to +125 °C operation ensure timing closure across environmental extremes without derating.	Use Scenario: Buffering encrypted command streams between secure crypto processors and RF modems in tactical radios. IC Role / Device Role / Timing Role: Isolating voltage domains (5-V crypto core ↔ 3.3-V RF front-end) while preserving bit-level synchronization via common CLK/CLR. Use Value: 5.5-V-tolerant inputs eliminate external level-shifting components, reducing BOM count and failure points in SWaP-constrained designs.
Radar Signal Processing	Spacecraft Onboard Computer
Use Scenario: Latching time-of-flight samples from phased-array radar receivers before digitization and beamforming. IC Role / Device Role / Timing Role: High-speed parallel register capturing 8-bit echo return words at up to 165 MHz, with CLR enabling rapid pattern reinitialization. Use Value: f_max = 165 MHz @ 5 V and low propagation skew (<1.5 ns t_sk(o)) preserve pulse fidelity in real-time processing pipelines.	Use Scenario: Storing configuration bits for radiation-hardened SoCs during boot sequence in LEO satellite platforms. IC Role / Device Role / Timing Role: Nonvolatile shadow register holding FPGA configuration status flags, cleared only during power-on reset or watchdog timeout. Use Value: Hermetic CFP-20 package and MIL-PRF-38535 qualification ensure long-term reliability in total ionizing dose (TID) environments >100 krad(Si).

Avionics Data Acquisition

Secure Military Communication

Use Scenario: Capturing synchronized sensor data (e.g., inertial measurement unit outputs) in flight control computers where deterministic timing and radiation tolerance are critical.

IC Role / Device Role / Timing Role: Octal register holding parallel analog-to-digital converter outputs until processed by a rad-hard FPGA; CLR used for cold-start reset.

Use Value: Guaranteed t_su ≤ 4.5 ns and −55 °C to +125 °C operation ensure timing closure across environmental extremes without derating.

Use Scenario: Buffering encrypted command streams between secure crypto processors and RF modems in tactical radios.

IC Role / Device Role / Timing Role: Isolating voltage domains (5-V crypto core ↔ 3.3-V RF front-end) while preserving bit-level synchronization via common CLK/CLR.

Use Value: 5.5-V-tolerant inputs eliminate external level-shifting components, reducing BOM count and failure points in SWaP-constrained designs.

Radar Signal Processing

Spacecraft Onboard Computer

Use Scenario: Latching time-of-flight samples from phased-array radar receivers before digitization and beamforming.

IC Role / Device Role / Timing Role: High-speed parallel register capturing 8-bit echo return words at up to 165 MHz, with CLR enabling rapid pattern reinitialization.

Use Value: f_max = 165 MHz @ 5 V and low propagation skew (<1.5 ns t_sk(o)) preserve pulse fidelity in real-time processing pipelines.

Use Scenario: Storing configuration bits for radiation-hardened SoCs during boot sequence in LEO satellite platforms.

IC Role / Device Role / Timing Role: Nonvolatile shadow register holding FPGA configuration status flags, cleared only during power-on reset or watchdog timeout.

Use Value: Hermetic CFP-20 package and MIL-PRF-38535 qualification ensure long-term reliability in total ionizing dose (TID) environments >100 krad(Si).

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
SN74AHC273DBR	Commercial-grade SSOP-20; R_θJA = 98.7 °C/W; operates −40 °C to +125 °C	Lacks MIL-PRF-38535 screening; not rated for −55 °C or hermetic sealing	Select for cost-sensitive industrial or telecom systems where extended temperature and radiation hardness are unnecessary
SNJ54ACT273W	TTL-compatible input thresholds (V_IH = 2 V min); higher ICC (40 µA vs. 4 µA); same CFP-20 package	Higher power consumption and reduced noise margin vs. AHC family; suited for legacy TTL interface compatibility	Select only when interfacing directly with older 74ACT-based subsystems requiring TTL logic levels

Compared with SNJ54AHC273W, SN74AHC273DBR offers lower cost and RoHS compliance but sacrifices military temperature range and hermeticity, while SNJ54ACT273W maintains pinout compatibility but trades AHC's low-power advantage for TTL-level interoperability-making SNJ54AHC273W optimal for new high-reliability designs demanding both wide V_CC flexibility and radiation tolerance.

Availability

SNJ54AHC273W is available at Aetrix Electronics and suitable for avionics data acquisition, secure military communication, radar signal processing, and spacecraft onboard computer applications requiring stable component supply across extended temperature and radiation-exposed environments.

Supply support for SNJ54AHC273W 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 ICs for industrial, automotive, aerospace, and defense markets.

The SNJ54AHC273W belongs to TI's military logic portfolio designed specifically for high-integrity digital control, data capture, and interface bridging in safety- and mission-critical systems where extended temperature, radiation tolerance, and long-term supply assurance are mandatory.

FAQ

What is the maximum clock frequency supported by SNJ54AHC273W?

SNJ54AHC273W supports a maximum clock frequency of 165 MHz when operated at V_CC = 5 V ± 0.5 V with a 15-pF load capacitance, as specified in Section 5.9 of the TI SCLS376J datasheet. At 50-pF load, f_max drops to 110 MHz. These values assume proper bypassing, layout, and signal integrity controls-exceeding them may cause metastability or timing violations in the SNJ54AHC273W.

Does SNJ54AHC273W require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs of SNJ54AHC273W must be tied to either V_CC or GND to prevent floating states that could cause excessive current draw or erratic operation. This requirement is explicitly stated in Section 5.3 of the TI datasheet and applies to any unconnected D, CLK, or CLR pins. Leaving inputs floating violates the recommended operating conditions and risks latch-up or increased power dissipation in the SNJ54AHC273W.

Can SNJ54AHC273W safely interface with 5-V logic while powered at 3.3 V?

Yes, SNJ54AHC273W features 5.5-V-tolerant inputs, allowing its D and CLK pins to accept 5-V signals even when V_CC is as low as 2 V. This enables direct down-translation from 5-V microcontrollers or FPGAs into 3.3-V or 2.5-V domains without external level shifters-confirmed in Section 7.1 and 7.3 of the TI SCLS376J datasheet for the SNJ54AHC273W.

What is the thermal resistance (R_θJA) of SNJ54AHC273W in its CFP-20 package?

The junction-to-ambient thermal resistance (R_θJA) of SNJ54AHC273W in the CFP (W) package is 81.1 °C/W, as documented in Table 5.4 of the TI SCLS376J datasheet. This value assumes standard JEDEC test board conditions and is critical for thermal design validation in high-density military PCB layouts where the SNJ54AHC273W may operate continuously at full speed near temperature limits.

Is SNJ54AHC273W compliant with MIL-PRF-38535 requirements?

Yes, SNJ54AHC273W is fully compliant with MIL-PRF-38535, including Class B screening, extended temperature testing (−55 °C to +125 °C), and hermetic packaging in the CFP-20 (W) format. All parameters are production-tested per the specification unless otherwise noted, and the device carries the appropriate QML certification markings-verified in the "Device Information" and "Mechanical, Packaging, and Orderable Information" sections of the TI datasheet for SNJ54AHC273W.

SNJ54AHC273W 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:: -

SNJ54AHC273W FAQ

1.How can I place an order for SNJ54AHC273W through Aetrix?

Please submit a Request for Quotation (RFQ) for SNJ54AHC273W 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 SNJ54AHC273W reliable?

The price and inventory of SNJ54AHC273W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHC273W is usually 5 days.

3.What payment methods are accepted for SNJ54AHC273W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AHC273W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SNJ54AHC273W?

SNJ54AHC273W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SNJ54AHC273W 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 SNJ54AHC273W?

For technical support, including SNJ54AHC273W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHC273W requirements.

6.How does Aetrix verify that SNJ54AHC273W is sourced from the original manufacturer or authorized distributors?

All SNJ54AHC273W 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 SNJ54AHC273W meets industry standards.

7.What is the process for return or replacement of SNJ54AHC273W?

All SNJ54AHC273W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHC273W, 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 SNJ54AHC273W part is unused and in its original packaging.

Return procedure for SNJ54AHC273W:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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