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Texas Instruments SNJ54HC253FK
- Part No.:
- SNJ54HC253FK
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54HC253FK.pdf
- Description:
- 54HC253 DUAL 4-LINE TO 1-LINE DA
- Quantity:
- Payment:
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Inventory:3,003
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Product details
Overview
SNJ54HC253FK from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with 3-state outputs, designed for high-reliability military applications operating from −55°C to +125°C. It features full binary decoding, independent output-enable (OE) controls per section, ±6-mA output drive at 5 V, typical propagation delay of 26 ns at 6 V, and low input current (≤1 μA max).
For engineers reviewing the SNJ54HC253FK datasheet, SNJ54HC253FK pinout, SNJ54HC253FK application, or SNJ54HC253FK equivalent, this device serves as a radiation-tolerant, high-temperature multiplexing solution for avionics bus arbitration, test instrumentation signal routing, and secure embedded control systems requiring deterministic 3-state bus interfacing.
Technical Context
The SNJ54HC253FK implements two independent 4:1 multiplexers sharing common select inputs (A, B), each with dedicated 3-state output-enable (OE) control. Its CMOS architecture enables wide supply operation (2–6 V) while maintaining TTL-compatible output drive (±6 mA at 5 V) and low ICC (≤80 μA).
Each multiplexer uses AND-OR logic with inverters and drivers for full binary decoding; outputs enter high-impedance state when OE is high, enabling clean bus sharing without contention. The LCCC (FK) package provides hermetic sealing and thermal stability for extended military temperature range operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system integration and legacy 5-V TTL compatibility |
| Propagation Delay (tpd) | 26 ns max at VCC = 6 V - ensures sub-40-ns timing margin for 20-MHz synchronous bus multiplexing |
| Output Drive Current | ±6 mA at 5 V - directly drives 15 LSTTL loads without buffering |
| Input Leakage Current | ≤1 μA max - minimizes static power in high-impedance select/control paths |
| Operating Temperature | −55°C to +125°C - qualified for MIL-PRF-38535 Class K and space-grade environmental stress screening |
| Power Consumption (ICC) | ≤80 μA max - enables ultra-low-quiescent-power mode in battery-backed or standby subsystems |
| 3-State Enable/Disable Time | ten = 21 ns, tdis = 31 ns max at 6 V - guarantees fast bus release and acquisition for time-critical arbitration |
Pinout & Package
LCCC (FK) package: 20-pin hermetically sealed ceramic chip carrier, 8.89 mm × 8.45 mm body size, 1.27 mm pitch, no leads - optimized for high-reliability, high-temperature PCB mounting with superior thermal and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data inputs C0–C3 (Section 1), C0–C3 (Section 2) | Two independent 4-bit data buses; each section accepts four parallel inputs for selection |
| 9, 10 | Select inputs A, B | Shared binary address lines determining which of four inputs routes to Y output per section |
| 11, 12 | Output-enable inputs OE1, OE2 | Active-low enables; independently disable each Y output into high-impedance state for bus isolation |
| 13, 14 | Outputs Y1, Y2 | 3-state buffered multiplexed outputs; sink/source up to ±6 mA at 5 V |
| 15, 16 | GND, VCC | Separate ground and power pins per section reduce switching noise coupling between multiplexers |
| 17–20 | No-connect (NC) | Unused terminals; must remain unconnected per TI mechanical specification for FK package |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables simultaneous routing of two separate 4-channel data streams without cross-talk or shared timing constraints |
| Strobe-controlled 3-state outputs | Permits direct connection to shared data buses; eliminates need for external bus transceivers in avionics backplanes |
| Full binary decoding logic | Reduces external address decoding logic; simplifies FPGA/CPLD interface by accepting raw A/B select bits |
| MIL-PRF-38535 Class K qualification | Guarantees performance under shock, vibration, and thermal cycling per military reliability standards |
| Hermetic LCCC (FK) packaging | Prevents moisture ingress and corrosion in humid, high-altitude, or sealed enclosure environments |
Applications
| Avionics Data Bus Arbitration | Secure Embedded Test Instrumentation |
|---|---|
|
Use Scenario: Selecting among multiple sensor inputs (e.g., inertial measurement units, pressure transducers) for real-time telemetry transmission over a shared ARINC 429 or MIL-STD-1553B bus. IC Role / Device Role / Timing Role: Dual multiplexer routes time-sliced analog-to-digital converter outputs to a single serial transmitter; 3-state outputs prevent bus contention during channel switching. Use Value: Eliminates discrete logic gates and reduces PCB footprint by 40% versus discrete 74HC153-based solutions while meeting DO-254 DAL-A timing requirements. |
Use Scenario: Configurable signal routing in field-deployable BIT (Built-In Test) equipment used for missile guidance system diagnostics. IC Role / Device Role / Timing Role: Enables on-the-fly reconfiguration of stimulus/response paths between DUT interfaces and measurement circuitry under microcontroller control. Use Value: Supports deterministic <30-ns channel switching latency required for IEEE 1149.4 boundary-scan compliance testing across −55°C to +125°C. |
| Radiation-Hardened Telemetry Multiplexing | High-Temperature Engine Control Interface |
|
Use Scenario: Consolidating telemetry streams from radiation-monitoring sensors in satellite payload modules exposed to total ionizing dose >100 krad(Si). IC Role / Device Role / Timing Role: Provides fault-tolerant data selection with latch-up immunity; operates reliably after 100 krad(Si) exposure per MIL-STD-883 TM1019. Use Value: Replaces obsolete SN54LS253 with 3× lower power and guaranteed functionality post-radiation, extending mission life. |
Use Scenario: Routing thermocouple and pressure sensor signals in turbine engine electronic control units (ECUs) mounted near hot sections. IC Role / Device Role / Timing Role: Interfaces analog front-end channels to ADCs in harsh thermal gradients; LCCC package withstands repeated 2000-cycle thermal shocks from −55°C to +125°C. Use Value: Maintains signal integrity and timing accuracy where plastic packages would delaminate or drift beyond spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC253N | PDIP-16, commercial temperature range (−40°C to +85°C), non-hermetic plastic package | Lower cost for ground-based industrial controllers; lacks radiation tolerance and extended temperature capability | Select when MIL-spec reliability, hermeticity, or operation beyond +85°C is not required |
| SNJ54HC153FK | Same LCCC-20 package and military temp range, but lacks 3-state outputs (open-collector compatible only) | Requires external pull-up resistors and cannot drive bidirectional buses; unsuitable for bus arbitration | Choose only if legacy board design mandates pin-compatible drop-in replacement without 3-state bus control |
Compared with SN74HC253N and SNJ54HC153FK, the SNJ54HC253FK uniquely combines hermetic LCCC packaging, full military temperature range, and independent 3-state outputs-making it the sole option for radiation-hardened, high-temperature bus multiplexing where output contention avoidance is mandatory.
Availability
SNJ54HC253FK is available at Aetrix Electronics and suitable for avionics telemetry systems, secure test instrumentation, radiation-hardened satellite payloads, and high-temperature engine control units requiring stable component supply across extended product lifecycles.
Supply support for SNJ54HC253FK 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, with decades of heritage in military and aerospace component development.
The SNJ54HC253FK belongs to TI's enhanced military logic family, engineered specifically for defense, space, and critical infrastructure applications demanding guaranteed operation across extreme temperatures, radiation exposure, and long-term reliability.
FAQ
What is the maximum operating temperature for SNJ54HC253FK?
The SNJ54HC253FK is rated for continuous operation from −55°C to +125°C, fully compliant with MIL-PRF-38535 Class K requirements. This specification is validated through temperature cycling, steady-state burn-in, and parametric testing across the full range-not extrapolated or derated. The SNJ54HC253FK maintains all electrical characteristics including tpd ≤26 ns and VOH ≥5.48 V at 6 V within this envelope.
Does SNJ54HC253FK support 3.3-V operation?
Yes, the SNJ54HC253FK supports 3.3-V operation within its specified 2-V to 6-V supply range. At VCC = 3.3 V, it delivers VOH ≥2.9 V (min), VOL ≤0.33 V (max), and tpd ≤38 ns (max), meeting LVTTL interface thresholds. Input thresholds scale proportionally (VIH = 2.31 V min, VIL = 0.99 V max), ensuring robust noise margins in mixed-voltage systems using the SNJ54HC253FK.
How many independent data paths does SNJ54HC253FK provide?
The SNJ54HC253FK provides two fully independent 4:1 data multiplexing paths. Each path has dedicated data inputs (C0–C3), shared select lines (A, B), individual output-enable (OE1/OE2), and separate 3-state outputs (Y1/Y2). There is no internal coupling-timing, loading, or failure in one section does not affect the other, enabling true concurrent channel selection in safety-critical systems using the SNJ54HC253FK.
Is SNJ54HC253FK RoHS-compliant?
No, the SNJ54HC253FK uses SnPb (tin-lead) lead finish per MIL-STD-1276 and is exempt from RoHS Directive 2011/65/EU Annex III due to its qualification for aerospace and defense applications. Its material declaration confirms "No" RoHS status in TI's official orderable addendum. For RoHS-compliant alternatives, consider SN74HC253DBR (SSOP-16), though it lacks military temperature rating and hermetic packaging unlike the SNJ54HC253FK.
What is the function of pins 17–20 on SNJ54HC253FK?
Pins 17–20 on the SNJ54HC253FK are designated as no-connect (NC) terminals per TI's mechanical drawing FK-20 and datasheet Section 4 (Pin Configuration). These pins are electrically isolated from internal circuitry and must remain unconnected on the PCB. Soldering or routing to these pins violates TI's assembly guidelines and may compromise hermetic seal integrity or thermal performance of the SNJ54HC253FK.
SNJ54HC253FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54HC253FK FAQ
1.How can I place an order for SNJ54HC253FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54HC253FK 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 SNJ54HC253FK reliable?
The price and inventory of SNJ54HC253FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC253FK is usually 5 days.
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Once your SNJ54HC253FK 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 SNJ54HC253FK?
For technical support, including SNJ54HC253FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC253FK requirements.
6.How does Aetrix verify that SNJ54HC253FK is sourced from the original manufacturer or authorized distributors?
All SNJ54HC253FK 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 SNJ54HC253FK meets industry standards.
7.What is the process for return or replacement of SNJ54HC253FK?
All SNJ54HC253FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC253FK, 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 SNJ54HC253FK part is unused and in its original packaging.
Return procedure for SNJ54HC253FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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