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Texas Instruments 8512401EA
- Part No.:
- 8512401EA
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
8512401EA.pdf
- Description:
- SN54HC257 QUAD 2-LINE TO 1-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:211
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Product details
Overview
8512401EA from Texas Instruments is a high-speed CMOS quad 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus interface in high-performance digital systems. It operates across 2 V to 6 V, delivers ±6-mA output drive at 5 V, exhibits typical propagation delay of 9 ns (VCC = 6 V), and supports −55°C to +125°C industrial/military temperature range in CDIP package.
For engineers reviewing the 8512401EA datasheet, 8512401EA pinout, 8512401EA application, or 8512401EA equivalent, this device serves as a logic-level signal routing solution where low-power, wide-voltage operation and bus-isolation capability are critical - especially in legacy military, avionics, and ruggedized control subsystems requiring through-hole reliability and extended thermal tolerance.
Technical Context
The 8512401EA implements dual 4-bit multiplexing with independent A/B select control per channel and a global 3-state enable (G) input. Its architecture uses standard HC-series CMOS logic with Schmitt-trigger–free inputs and rail-to-rail output swing, enabling direct interfacing with LSTTL loads without level-shifting.
All four Y outputs enter high-impedance state when G is high, decoupling source buses during idle or power-transition periods. Input transition times are specified down to 400 ns (VCC = 6 V), and internal logic ensures glitch-free switching under valid setup/hold timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system integration and battery-backed operation without regulator dependency |
| Propagation Delay (tpd) | 9 ns typical at VCC = 6 V, CL = 50 pF - enables ≤100 MHz clock-domain multiplexing in synchronous logic paths |
| Output Drive Capability | ±6 mA at VCC = 5 V - directly drives up to 15 LSTTL loads without external buffers |
| Quiescent Current (ICC) | 80 µA max - enables ultra-low static power in always-on monitoring or standby subsystems |
| Operating Temperature | −55°C to +125°C - qualified for military-grade environmental stress and extended-life embedded deployments |
| Input Leakage Current | ±1 µA max - ensures stable logic levels with high-impedance pull-ups/pull-downs in noise-prone environments |
| 3-State Enable Threshold | G high = disable (Z-state); G low = active - allows fail-safe bus isolation during power-up/down sequences |
Pinout & Package
8512401EA is housed in a 16-pin Ceramic Dual In-line Package (CDIP-J), hermetically sealed for moisture resistance and thermal stability in harsh environments. Pin layout matches industry-standard 0.3-inch DIP footprint with 0.1-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 12, 13, 15, 16 | Data Inputs (1A/1B, 2A/2B, 3A/3B, 4A/4B) | Eight parallel input lines grouped into four independent 2:1 data sources |
| 3, 6, 10, 14 | Outputs (1Y, 2Y, 3Y, 4Y) | Active-low-enabled 3-state outputs; high-impedance when G = high |
| 7 | GND | Ground reference for all logic and output stages |
| 8 | VCC | Primary supply rail (2–6 V); powers internal logic and output drivers |
| 9 | A/B | Global select line determining whether A-inputs or B-inputs pass to outputs |
| 11 | G | Output-enable control: low = outputs active, high = outputs tri-stated |
Key Features
| Feature | Design Value |
|---|---|
| Wide-Voltage Operation | Functional across 2–6 V supply - eliminates need for separate voltage translators in multi-rail backplanes |
| Bus-Isolation Architecture | True 3-state outputs with guaranteed high-Z on G assertion - prevents bus contention in shared-data-path systems |
| Low-Power CMOS Core | 80 µA max ICC - reduces thermal load and extends battery life in portable test equipment and field-deployed controllers |
| Military Temperature Qualification | −55°C to +125°C operation - validated for use in aerospace telemetry, defense comms, and engine-control ECUs |
| High-Noise Immunity | Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max) - maintains robust logic discrimination under EMI stress |
Applications
| Avionics Data Bus Interface | Industrial PLC I/O Multiplexing |
|---|---|
Use Scenario: Routing sensor data streams from redundant flight control sensors to a central processing unit in real-time. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between primary and backup analog-to-digital converter outputs under fault-tolerant arbitration logic. Use Value: Enables seamless failover without bus interruption, leveraging 3-state outputs to isolate faulty channels while maintaining signal integrity across MIL-STD-1553-compatible timing windows. |
Use Scenario: Consolidating discrete I/O signals from multiple machine-tool modules onto a single controller bus. IC Role / Device Role / Timing Role: Signal-routing hub that dynamically assigns physical inputs to logical addresses based on configuration registers. Use Value: Reduces PCB layer count and connector pin count by 50% versus discrete wiring, while maintaining deterministic <10 ns path skew across all four channels. |
| Ruggedized Test Equipment | Military Radio Baseband Switching |
Use Scenario: Channel selection in handheld field-testers used for verifying continuity and signal integrity in deployed communication harnesses. IC Role / Device Role / Timing Role: Manual or microcontroller-driven multiplexer enabling sequential probing of up to eight test points via four bidirectional ports. Use Value: CDIP packaging withstands repeated thermal cycling and mechanical shock, while wide VCC range accommodates aging battery voltages down to 2.1 V without functional degradation. |
Use Scenario: Baseband signal routing between encryption modules, modulators, and antenna interfaces in tactical HF/VHF radios. IC Role / Device Role / Timing Role: Secure path selector ensuring cryptographic key material never shares a physical trace with RF transmit paths. Use Value: Guaranteed 3-state isolation during mode transitions prevents RF leakage into sensitive crypto circuitry, meeting TEMPEST shielding requirements without additional analog switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54HC257J | Identical electrical specs, same CDIP-J package, identical pinout and marking - functionally identical military-grade variant | No difference; fully interchangeable in form, fit, and function | Select SNJ54HC257J only if required by procurement policy mandating QML-38534 certification documentation |
| SN54HC257J | Same die, same package, same temperature range; differs only in screening/test flow - no electrical or timing variation | Same use cases; may lack full QML qualification paperwork but meets identical performance specs | Prefer SN54HC257J for cost-sensitive programs where full QML-38534 compliance is not contractually enforced |
Compared with SNJ54HC257J and SN54HC257J, the 8512401EA is electrically and mechanically identical - all three share the same silicon, CDIP-J package, −55°C to +125°C rating, and 9 ns tpd; differentiation lies solely in TI's internal orderable part numbering and associated certification documentation scope.
Availability
8512401EA is available at Aetrix Electronics and suitable for avionics data bus interface, industrial PLC I/O multiplexing, and ruggedized test equipment requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for 8512401EA 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 logic solutions, with over 50 years of innovation in high-reliability IC design.
The 8512401EA belongs to TI's SN54HC logic family - engineered for military and aerospace applications demanding extended temperature operation, hermetic packaging, and proven radiation-tolerant process technology.
FAQ
What is the maximum operating voltage for the 8512401EA?
The 8512401EA supports a supply voltage range of 2 V to 6 V, with absolute maximum rating at 7 V. Operation above 6 V risks permanent damage, and recommended conditions specify 2–6 V for reliable functionality across its full −55°C to +125°C temperature range. This wide range allows direct integration into legacy 5 V systems and emerging low-voltage architectures without level-shifting.
Does the 8512401EA support true 3-state outputs?
Yes, the 8512401EA provides true 3-state outputs controlled by the G (enable) input. When G is high, all four Y outputs enter high-impedance state with leakage current ≤±0.5 µA, effectively isolating connected buses. This behavior is verified across temperature and voltage extremes and is essential for preventing contention in shared-data-path designs.
What is the propagation delay of the 8512401EA at 5 V supply?
At VCC = 5 V and CL = 50 pF, the 8512401EA exhibits a typical propagation delay (tpd) of 10 ns, with maximum specified at 25 ns over temperature. This value applies to both A/B-to-Y and A/B-select-to-Y paths, ensuring predictable timing margins in synchronous bus-switching applications.
Is the 8512401EA pin-compatible with commercial-grade SN74HC257 variants?
No - the 8512401EA uses the CDIP-J package (16-pin ceramic DIP), whereas commercial SN74HC257 variants use SOIC-D, PDIP-N, TSSOP-PW, or SOP-NS packages. While logic function and pin assignment are identical, physical dimensions, thermal characteristics, and mounting methods differ significantly; PCB layout must be dedicated to CDIP-J footprint.
What is the input leakage current specification for the 8512401EA?
The 8512401EA specifies maximum input leakage current (II) of ±1 µA at VCC = 6 V and TA = 25°C, with worst-case values remaining below ±1000 nA across full temperature range. This low leakage ensures stable logic states even with high-value pull-up resistors (e.g., 100 kΩ) in low-power remote sensor nodes.
8512401EA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 4 x 2:1
- 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:
- Military
- Qualification:
- MIL-PRF-38535
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
8512401EA FAQ
1.How can I place an order for 8512401EA through Aetrix?
Please submit a Request for Quotation (RFQ) for 8512401EA 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 8512401EA reliable?
The price and inventory of 8512401EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8512401EA is usually 5 days.
3.What payment methods are accepted for 8512401EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8512401EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 8512401EA?
8512401EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8512401EA 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 8512401EA?
For technical support, including 8512401EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8512401EA requirements.
6.How does Aetrix verify that 8512401EA is sourced from the original manufacturer or authorized distributors?
All 8512401EA 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 8512401EA meets industry standards.
7.What is the process for return or replacement of 8512401EA?
All 8512401EA units undergo pre-shipment inspection (PSI). If there is an issue with 8512401EA, 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 8512401EA part is unused and in its original packaging.
Return procedure for 8512401EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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