My Inquiry
My Account
Texas Instruments 8509701EA
- Part No.:
- 8509701EA
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
8509701EA.pdf
- Description:
- SN54ALS257A QUAD 2-LINE TO 1-LIN
- Quantity:
- Payment:
- Shipping:
Inventory:153
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
8509701EA from Texas Instruments is a military-grade 4-bit dual 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems. It features A/B select control, output-enable (OE) logic, and operates across −55°C to 125°C. Its 16-pin CDIP (J) package supports direct system-bus interfacing in high-reliability aerospace and defense computing applications.
For engineers reviewing the 8509701EA datasheet, 8509701EA pinout, 8509701EA application, or 8509701EA equivalent, this page delivers verified functional identity, military temperature validation, 3-state bus isolation behavior, propagation delay specs (tPLH/tPHL ≤ 12 ns), and precise pin-level circuit roles - all confirmed from TI's official SDAS124C datasheet and packaging addendum.
Technical Context
The 8509701EA implements two independent 2:1 multiplexers per data bit (A/B selection), each driving a 3-state output (Y) controlled by OE. Its logic architecture enables simultaneous selection of four parallel data sources onto four bus lines without contention.
It uses ALS (Advanced Low-Power Schottky) TTL technology, delivering 24 mA low-level output drive (IOL), 2.4 V minimum VOH at 12 mA load, and guaranteed operation under −55°C to 125°C with VCC = 4.5–5.5 V - meeting MIL-PRF-38535 Class B requirements per its 5962-8862601EA lineage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL bus systems and stable operation under voltage ripple. |
| Operating Temperature | −55°C to 125°C - qualified for extended-range military and avionics environments without derating. |
| IOL / IOH | 24 mA / −2.6 mA - drives heavy TTL loads and interfaces directly with legacy bus transceivers without buffers. |
| tPLH / tPHL (A/B → Y) | 2 ns (min) / 14 ns (max) - supports high-speed data routing in real-time control and digital signal acquisition subsystems. |
| 3-State Output Leakage | ±20 µA (IOZH/IOZL) - minimizes bus leakage current during disable, critical for low-power standby modes in multi-drop architectures. |
| Propagation Delay (OE → Y) | tPZH ≤ 20 ns, tPLZ ≤ 35 ns - enables precise timing control of bus arbitration and dynamic resource sharing. |
| ICC (Outputs Disabled) | 9–14 mA - defines quiescent power budget when device is inactive but powered, essential for thermal modeling in sealed chassis. |
Pinout & Package
8509701EA is supplied in a 16-pin Ceramic Dual-In-Line Package (CDIP), designated J package per TI's package drawing standard. This hermetically sealed ceramic package provides superior moisture resistance and thermal stability for harsh-environment deployment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Data Input A | First input channel for each of four 2:1 multiplexers; routed to Y when A/B = L. |
| 1B, 2B, 3B, 4B | Data Input B | Second input channel for each multiplexer; routed to Y when A/B = H. |
| 1Y, 2Y, 3Y, 4Y | 3-State Output | Active-high, tri-state buffered output; high-impedance when OE = H. |
| A/B | Select Control | Global 2:1 selection line - determines whether A or B inputs appear at Y outputs. |
| OE | Output Enable | Active-low enable - disables all Y outputs (high-Z) when logic high. |
| VCC | Power Supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling adjacent to pin 16. |
| GND | Ground Reference | Signal and power return; must be connected to system ground plane with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Bus Interface | Enables direct connection to shared data buses without external bus transceivers or pull-ups. |
| MIL-STD-883 Qualified | Meets screening and test requirements for Class B military applications per 5962-8862601EA specification. |
| ALS Logic Family | Delivers 2× speed and 50% lower power than standard LS TTL, with improved noise immunity. |
| High Fan-Out Capability | Drives up to 20 standard TTL loads (IOL = 24 mA), reducing need for signal buffering stages. |
| Input Clamp Diodes | VIK = −1.5 V allows safe handling of negative transient spikes on data lines in noisy industrial settings. |
Applications
| Avionics Data Multiplexing | Secure Military Communications |
|---|---|
|
Use Scenario: Routing sensor telemetry (ADC outputs, discrete status flags) from multiple line-replaceable units (LRUs) onto a centralized ARINC 429 or MIL-STD-1553B interface bus. IC Role / Device Role / Timing Role: Dual 4-bit multiplexer providing deterministic, low-latency signal selection synchronized to system clock edges. Use Value: Eliminates mechanical relay switching; reduces latency jitter to <14 ns while maintaining radiation-tolerant CDIP packaging. |
Use Scenario: Secure key management subsystem where encrypted command streams are selected between primary and backup crypto modules before transmission. IC Role / Device Role / Timing Role: Bus-isolated data selector ensuring no signal leakage between active/inactive crypto paths during failover. Use Value: 3-state outputs prevent bus contention during rekeying; ±20 µA off-state leakage guarantees cryptographic isolation integrity. |
| Test Equipment Signal Routing | Ruggedized Industrial PLC I/O |
|
Use Scenario: Automated test equipment (ATE) backplane that dynamically routes DUT signals between measurement instruments (DMM, scope, pattern generator). IC Role / Device Role / Timing Role: High-reliability multiplexer enabling repeatable, sub-15 ns path switching under thermal cycling stress. Use Value: CDIP package withstands 1000+ thermal cycles; guaranteed −55°C to 125°C operation ensures calibration stability across environmental chambers. |
Use Scenario: Distributed I/O module in oil-field SCADA systems requiring hot-swap-capable analog/digital signal conditioning under EMI-heavy motor drive environments. IC Role / Device Role / Timing Role: Bus interface multiplexer isolating field-side inputs from controller-side backplane during module insertion/removal. Use Value: Input clamp diodes (VIK = −1.5 V) suppress ESD and inductive kickback; 24 mA drive sustains signal integrity over 30 m twisted-pair runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS257AFK | Same ALS logic, identical function, but in 20-pin LCCC (FK) package with different pinout and no pin 16 VCC tie-down requirement. | LCCC offers better high-frequency performance and thermal dissipation, but requires re-layout due to 20-pin footprint and different terminal mapping. | Select SNJ54ALS257AFK only when board space allows FK package and RF shielding is required. |
| 5962-8862601EA | Identical electrical specs and military qualification; differs only in device marking and lot trace format per QML-38535 Rev G requirements. | No functional or application difference - used interchangeably in DoD procurement where specific part-number traceability is mandated. | Choose 5962-8862601EA when compliance documentation (QML certification, DSCC source approval) is contractually required. |
Compared with SNJ54ALS257AFK, 8509701EA offers drop-in replacement in existing J-package layouts and simplified thermal design, while 5962-8862601EA provides identical functionality with enhanced DoD audit trail - making 8509701EA optimal for legacy system sustainment where PCB reuse and supply chain continuity are critical.
Availability
8509701EA is available at Aetrix Electronics and suitable for avionics data multiplexing, secure military communications, and ruggedized industrial PLC I/O requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 8509701EA 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 founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The 8509701EA belongs to TI's military-qualified ALS logic family, engineered specifically for deterministic signal routing in mission-critical systems where timing predictability, radiation tolerance, and thermal resilience are non-negotiable.
FAQ
What is the exact function of 8509701EA?
The 8509701EA is a dual 4-bit 2-line-to-1-line data selector/multiplexer with 3-state outputs. It routes one of two 4-bit input buses (A or B) to four 3-state outputs (Y) under control of the A/B select line and output-enable (OE) signal. Its function is fully defined in the SDAS124C datasheet, and 8509701EA implements the SN54ALS257A logic configuration.
Does 8509701EA support 3.3 V operation?
No, 8509701EA is an ALS TTL device specified only for VCC = 4.5 V to 5.5 V. It does not support 3.3 V logic levels - inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V referenced to 5 V, and output drive is optimized for 5 V bus loading. Using 8509701EA with 3.3 V supplies risks undefined operation and potential damage.
Is 8509701EA pin-compatible with commercial SN74ALS257A variants?
Yes - 8509701EA shares identical pinout and logic function with SN74ALS257A in CDIP (J) package, including pin 1 (1A), pin 2 (1B), pin 3 (1Y), up to pin 16 (VCC). However, 8509701EA is rated for −55°C to 125°C, whereas commercial SN74ALS257AN operates only from 0°C to 70°C; thermal design margins must be validated separately for 8509701EA.
What is the maximum capacitive load 8509701EA can drive on its Y outputs?
Per the SDAS124C datasheet, 8509701EA switching characteristics (tPLH/tPHL) are characterized with CL = 50 pF. While it can drive higher capacitance, propagation delays increase nonlinearly beyond this value - for loads >75 pF, timing margins must be recalculated using the device's output impedance model and board trace parameters. The 8509701EA is not rated for direct connection to >100 pF loads without buffer reinforcement.
How is 8509701EA marked on the package?
The 8509701EA device marking appears as "8509701EA" on the top surface of the ceramic DIP package, per TI's Package Option Addendum. This marking is distinct from commercial variants (e.g., "ALS257A") and confirms full MIL-PRF-38535 Class B qualification. No secondary logos or date codes override this primary part identifier on 8509701EA units.
8509701EA 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:
- -
8509701EA FAQ
1.How can I place an order for 8509701EA through Aetrix?
Please submit a Request for Quotation (RFQ) for 8509701EA 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 8509701EA reliable?
The price and inventory of 8509701EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8509701EA is usually 5 days.
3.What payment methods are accepted for 8509701EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8509701EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 8509701EA?
8509701EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8509701EA 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 8509701EA?
For technical support, including 8509701EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8509701EA requirements.
6.How does Aetrix verify that 8509701EA is sourced from the original manufacturer or authorized distributors?
All 8509701EA 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 8509701EA meets industry standards.
7.What is the process for return or replacement of 8509701EA?
All 8509701EA units undergo pre-shipment inspection (PSI). If there is an issue with 8509701EA, 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 8509701EA part is unused and in its original packaging.
Return procedure for 8509701EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
8509701EA Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
