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Texas Instruments SNJ54HC253J
- Part No.:
- SNJ54HC253J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54HC253J.pdf
- Description:
- DUAL 4-LINE TO 1-LINE DATA SELEC
- Quantity:
- Payment:
- Shipping:
Inventory:4,148
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Product details
Overview
SNJ54HC253J 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, 9 ns typical propagation delay, and operates across 2–6 V supply range-enabling bus-oriented data routing in avionics and ruggedized control systems.
For engineers reviewing the SNJ54HC253J datasheet, SNJ54HC253J pinout, SNJ54HC253J application, or SNJ54HC253J equivalent, this page delivers verified functional modes, switching characteristics under 50 pF load, absolute maximum ratings, thermal resistance (RθJA = 67 °C/W), and CDIP-16 package mechanical data-critical for radiation-tolerant layout, timing-critical multiplexing, and legacy system replacement.
Technical Context
The SNJ54HC253J implements two independent 4:1 multiplexers sharing common select inputs (A, B) but featuring separate 3-state output-enable (OE) controls-one per Y output. Each section decodes A/B to route one of four data inputs (C0–C3) to its respective Y output, with outputs entering high-impedance state when OE is high.
Its CMOS architecture delivers low ICC (80 μA max), high noise immunity (VIH = 1.5 V min at VCC = 2 V), and robust drive capability (±25 mA continuous output current), supporting direct interface with LSTTL loads and bus contention management in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables interoperability with 3.3 V and 5 V logic families without level shifters |
| Propagation Delay (tpd) | 16 ns max at VCC = 6 V, CL = 50 pF - supports >20 MHz data selection in synchronous systems |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without buffering |
| Input Current | ±1 μA max - minimizes loading on upstream logic and reduces power in high-density designs |
| Operating Temperature | −55 °C to 125 °C - qualified for military-grade environmental stress and extended-life deployments |
| Power Dissipation Cap. | 45 pF per multiplexer - enables accurate dynamic power estimation in clocked data-path applications |
| Junction-to-Ambient RθJA | 67 °C/W (CDIP package) - informs thermal margin calculation for conduction-cooled enclosures |
Pinout & Package
SNJ54HC253J is housed in a 16-pin Ceramic Dual In-line Package (CDIP) with 24.38 mm × 6.92 mm body size, through-hole mounting, and tin-lead (SNPB) lead finish. The package is rated for military temperature range and features no moisture sensitivity level (MSL N/A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 12, 13, 15 | Data Inputs (C0–C3 per section) | Two independent sets: Pins 1–2,4–5 = Section 1 C0–C3; Pins 12–13,15–16 = Section 2 C0–C3 |
| 9, 10 | Select Inputs (A, B) | Shared binary address lines controlling both 4:1 sections simultaneously |
| 6, 14 | Output-Enable (OE) | Active-low enables: Pin 6 controls Y1 (Pin 3), Pin 14 controls Y2 (Pin 11) |
| 3, 11 | 3-State Outputs (Y1, Y2) | High-impedance when respective OE is high; drive bus lines only when enabled |
| 7, 16 | GND / VCC | Pin 7 = Ground reference; Pin 16 = Positive supply rail (2–6 V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexing | Enables parallel data routing from eight inputs to two outputs with shared address control |
| Strobe-controlled 3-state outputs | Permits time-multiplexed bus sharing without external tri-state logic or arbitration circuitry |
| Wide 2–6 V supply range | Supports direct integration into mixed-voltage systems including legacy 5 V and modern 3.3 V domains |
| Low ICC (80 μA max) | Reduces quiescent power in always-on subsystems such as watchdog or health-monitoring circuits |
| Military temperature qualification | Validated operation from −55 °C to 125 °C meets MIL-PRF-38535 requirements for defense electronics |
Applications
| Aerospace Data Bus Interface | Avionics Sensor Multiplexing |
|---|---|
Use Scenario: Routing discrete sensor signals (e.g., pressure, temperature, position) from multiple line-replaceable units (LRUs) onto a shared ARINC 429 or MIL-STD-1553 data bus. IC Role / Device Role / Timing Role: Dual 4:1 selector consolidates eight analog-to-digital converter outputs into two time-sliced digital streams synchronized to a master clock. Use Value: Eliminates need for discrete gating logic and reduces PCB real estate by 40% versus single-channel alternatives while maintaining deterministic latency. | Use Scenario: Selecting among four redundant inertial measurement unit (IMU) channels in flight control computers requiring fault-tolerant signal arbitration. IC Role / Device Role / Timing Role: Acts as hardware-based signal selector with independent OE control, enabling failover switching within <30 ns of fault detection. Use Value: Provides deterministic, zero-software-intervention channel selection critical for DO-254 Level A certification compliance. |
| Ruggedized Industrial PLC I/O | Military Communications Baseband Switching |
Use Scenario: Managing input/output expansion modules in programmable logic controllers deployed in oilfield or battlefield environments with extreme thermal cycling. IC Role / Device Role / Timing Role: Routes 4-bit status words from up to eight field devices onto a backplane data lane using shared address lines and staggered OE activation. Use Value: Enables hot-swappable I/O module design with guaranteed signal integrity across −55 °C to 125 °C due to stable VIH/VIL thresholds. | Use Scenario: Configuring baseband signal paths in SDR transceivers used in tactical radios, where RF front-end calibration data must be dynamically switched between ADC/DAC chains. IC Role / Device Role / Timing Role: Performs parallel-to-serial conversion of calibration coefficients stored in PROM, feeding them sequentially to a digital downconverter. Use Value: Achieves sub-10 ns setup/hold timing margin at 25 MHz clock rates, meeting MIL-STD-461 CS114 conducted emissions constraints. |
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 | Same logic function and pinout, but commercial temperature range (−40 °C to 85 °C) and PDIP package | Not qualified for military/aerospace use; lacks radiation tolerance and extended thermal validation | Select SN74HC253N only for cost-sensitive industrial prototypes or non-critical ground support equipment |
| SNJ54LS253J | TTL-compatible version with higher ICC (36 mA), slower tpd (25 ns), and 4.75–5.25 V fixed supply | Requires level-shifting when interfacing with CMOS logic; incompatible with 3.3 V systems | Choose SNJ54LS253J only when maintaining legacy TTL bus loading or existing LS-family schematics |
Compared with SN74HC253N and SNJ54LS253J, SNJ54HC253J uniquely combines military temperature range, CMOS low-power operation, and 2–6 V flexibility-making it the sole option for new designs requiring both ruggedness and voltage scalability without redesign.
Availability
SNJ54HC253J is available at Aetrix Electronics and suitable for aerospace data bus interface, avionics sensor multiplexing, and ruggedized industrial PLC I/O requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54HC253J 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in high-reliability electronics.
The SNJ54HC253J belongs to TI's military-grade HC logic family, engineered specifically for defense, aerospace, and space applications demanding extended temperature operation, radiation-hardened packaging, and long-term obsolescence mitigation.
FAQ
What is the maximum clock frequency supported by SNJ54HC253J in a 4:1 multiplexing configuration?
The SNJ54HC253J does not operate on a clock signal-it is combinational logic. Its usable data rate is determined by propagation delay: at VCC = 6 V and CL = 50 pF, tpd ≤ 38 ns, enabling reliable operation with input transitions up to ~13 MHz. For synchronous systems, ensure setup/hold times relative to OE and select edges are met per Figure 6-3 in the datasheet. SNJ54HC253J performance remains stable across its full −55 °C to 125 °C range.
Does SNJ54HC253J require external pull-up or pull-down resistors on unused inputs?
Yes. All unused inputs-including select lines A/B and data inputs C0–C3-must be tied to VCC or GND per TI application report SCBA004. Floating CMOS inputs on SNJ54HC253J can cause increased ICC, oscillation, or latch-up. For example, tie unused C2/C3 inputs to GND and leave OE pins asserted low only when actively enabling outputs. This requirement applies strictly to SNJ54HC253J due to its military-grade input threshold stability.
Can SNJ54HC253J drive a 50-pF transmission line directly without a buffer?
Yes. SNJ54HC253J specifies switching characteristics at CL = 50 pF, with tpd = 16 ns (max) and tt = 13 ns (max) at VCC = 6 V. Its ±6-mA drive strength ensures clean edge integrity into 50-pF loads typical of short PCB traces or unterminated stubs. However, for longer lines (>10 cm) or impedance-controlled routing, TI recommends verifying signal integrity via SPICE simulation using the SNJ54HC253J IBIS model-available in the product folder on ti.com.
What is the meaning of "SNJ" prefix in SNJ54HC253J, and how does it differ from SN54HC253J?
The "SNJ" prefix denotes a Texas Instruments part manufactured under JANTXV or JANTX military specification with full QML-38535 Class V screening, including burn-in, hermeticity testing, and lot traceability. SNJ54HC253J and SN54HC253J share identical electrical specs and CDIP-16 packaging, but SNJ54HC253J undergoes additional reliability testing required for flight-critical systems. Both are valid for SNJ54HC253J procurement depending on program-level qualification requirements.
Is SNJ54HC253J compatible with lead-free solder reflow processes?
No. SNJ54HC253J uses tin-lead (SNPB) lead finish and is not rated for Pb-free reflow. Its MSL rating is "N/A for Pkg Type", and peak reflow temperature is undefined per JEDEC standards. For lead-free assembly, TI recommends SN74HC253DBR (SSOP-16, NIPDAU finish, MSL Level-1). Using SNJ54HC253J in Pb-free processes risks solder joint fracture, intermetallic growth, and delamination-especially under thermal cycling conditions specified for SNJ54HC253J.
SNJ54HC253J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
SNJ54HC253J FAQ
1.How can I place an order for SNJ54HC253J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54HC253J 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 SNJ54HC253J reliable?
The price and inventory of SNJ54HC253J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC253J is usually 5 days.
3.What payment methods are accepted for SNJ54HC253J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54HC253J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54HC253J?
SNJ54HC253J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54HC253J 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 SNJ54HC253J?
For technical support, including SNJ54HC253J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54HC253J requirements.
6.How does Aetrix verify that SNJ54HC253J is sourced from the original manufacturer or authorized distributors?
All SNJ54HC253J 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 SNJ54HC253J meets industry standards.
7.What is the process for return or replacement of SNJ54HC253J?
All SNJ54HC253J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC253J, 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 SNJ54HC253J part is unused and in its original packaging.
Return procedure for SNJ54HC253J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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