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Texas Instruments JM38510/32803BRA
- Part No.:
- JM38510/32803BRA
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
JM38510/32803BRA.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
JM38510/32803BRA from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for bidirectional data transfer between A and B buses in harsh-environment systems. It features DIR-controlled direction (A↔B), active-low OE for high-impedance isolation, 8 ns typical propagation delay, ±12 mA output drive, and operates across –55°C to +125°C. Used in avionics backplanes and radiation-tolerant instrumentation where bus isolation and deterministic timing are critical.
For engineers reviewing the JM38510/32803BRA datasheet, JM38510/32803BRA pinout, JM38510/32803BRA application, or JM38510/32803BRA equivalent, this page delivers verified military-spec parameters, CDIP-20 package mapping, functional mode truth table, noise-immune hysteresis inputs, and direct alternatives compliant with MIL-PRF-38535 Class B screening.
Technical Context
The JM38510/32803BRA implements Schottky transistor logic (STTL) with PNP input stages that reduce DC loading on shared bus lines. Its bus-side inputs include built-in hysteresis (0.2–0.4 V) to improve noise margins in electrically noisy platforms such as aircraft control bays and ground vehicle ECUs.
Direction control is implemented via a single DIR pin that selects A→B (DIR = HIGH) or B→A (DIR = LOW); simultaneous bidirectional operation is not supported. Output enable (OE) is active-low and places all eight channels into high-impedance state when asserted, fully isolating A and B buses without leakage path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL (Low-power Schottky), compatible with standard 5-V TTL logic families and interfaces |
| Supply Voltage | 4.5 V to 5.5 V - supports stable operation under MIL-STD-704A power bus ripple and transient conditions |
| Propagation Delay | 8 ns typical (tPLH/tPHL) - enables reliable 10 MHz+ synchronous bus communication with margin |
| Output Drive | ±12 mA (IOL/IOH) - sufficient to drive 50-cm ribbon cables or unterminated backplane stubs |
| Operating Temperature | –55°C to +125°C - qualified per MIL-PRF-38535 Class B for extended life in sealed avionics enclosures |
| Input Hysteresis | 0.2–0.4 V (VT+ − VT−) - rejects common-mode noise up to ±200 mV on A/B bus lines |
| ESD Rating | ±2500 V HBM - meets MIL-STD-883 Method 3015.7 for handling in non-ESD-controlled environments |
Pinout & Package
Package: 20-pin Ceramic Dual In-line Package (CDIP), body size 24.20 mm × 6.92 mm, hermetically sealed, lead finish SNPB (tin-lead), RoHS-exempt, MSL N/A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH enables A→B data flow; LOW enables B→A data flow |
| 2–9 | A1–A8 | Bi-directional I/O pins for A-side bus - function as input or output depending on DIR state |
| 10 | GND | Signal reference ground - must be connected to system chassis ground for EMI suppression |
| 11–18 | B8–B1 | Bi-directional I/O pins for B-side bus - mirrored channel order (B8 to B1) per JEDEC pinout convention |
| 19 | OE | Active-low output enable: LOW enables transceiver; HIGH forces all A/B pins to high-impedance |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic bypass capacitor placed ≤2 mm from pin |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Full bus isolation with <1 µA off-state leakage (IOZL/IOZH) - prevents contention during hot-swap or fault recovery |
| PNP Input Structure | Reduces input DC loading to ≤0.1 mA per pin - preserves signal integrity on long, lightly terminated buses |
| Hysteresis at Bus Inputs | 0.2–0.4 V threshold window - eliminates chatter on slow-rising edges in noisy 28 VDC aircraft power environments |
| MIL-PRF-38535 Compliance | Class B screening including burn-in, temperature cycling, and parametric testing - ensures reliability in safety-critical flight systems |
| Bus Contention Protection | Short-circuit output current limited to –40 to –225 mA - prevents latch-up during momentary A/B bus misalignment |
Applications
| Avionics Data Backplane | Ground Vehicle Control Unit |
|---|---|
|
Use Scenario: Bidirectional data exchange between flight management computer (FMC) and inertial reference unit (IRU) over a 1.2-m shielded ribbon cable in a pressurized avionics bay. IC Role / Device Role / Timing Role: Bus transceiver providing level-shifted, isolated, and noise-hardened interface between two LS-TTL subsystems operating at different ground potentials. Use Value: 8 ns propagation delay ensures deterministic timing for ARINC 429-compatible framing; hysteresis rejects EMI from nearby VHF radios. |
Use Scenario: Interfacing engine control module (ECM) and transmission control module (TCM) across a 0.8-m harness in a diesel-powered armored vehicle with 24 VDC transients. IC Role / Device Role / Timing Role: Direction-controlled buffer enabling synchronized CAN message forwarding while preventing bus contention during reset sequences. Use Value: ±12 mA drive sustains signal integrity over 50 Ω characteristic impedance; –55°C to +125°C rating survives under-hood thermal cycling. |
| Nuclear Instrumentation System | Tactical Radio Baseband Interface |
|
Use Scenario: Isolating analog-to-digital converter (ADC) data bus from FPGA processing unit in a gamma spectrometer deployed in reactor containment. IC Role / Device Role / Timing Role: Radiation-tolerant bus isolator using OE to decouple ADC acquisition phase from FPGA readout phase. Use Value: Hermetic CDIP package resists neutron-induced single-event effects; high-impedance state prevents cross-talk during sampling windows. |
Use Scenario: Connecting baseband processor and RF front-end ASIC in a handheld SINCGARS radio operating in high-EMI battlefield environments. IC Role / Device Role / Timing Role: Synchronized data shuttle between QPSK modulator/demodulator blocks and digital signal processor (DSP) memory interface. Use Value: PNP inputs minimize loading on 50-Ω RF-adjacent traces; DIR pin enables time-division duplexing without external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LS245J | Identical electrical specs and CDIP-20 package; screened to MIL-PRF-38535 Class S (not Class B), with tighter parametric limits and full lot traceability | Required for DoD programs mandating Class S qualification; higher cost and longer lead times | Select SNJ54LS245J only when Class S compliance is contractually required; otherwise JM38510/32803BRA satisfies Class B needs |
| 5962-8002101VSA | CFP-20 package (7.02 mm × 13.72 mm), same –55°C to +125°C range, identical logic function, but different thermal resistance (RθJA = N/A) and mounting footprint | Suitable for space-constrained PCBs where CDIP height exceeds mechanical envelope; requires rework of keep-out and solder stencil | Choose 5962-8002101VSA only when board real estate or thermal path constraints prohibit CDIP use; no electrical redesign needed |
Compared with SNJ54LS245J, JM38510/32803BRA offers Class B qualification at lower cost and shorter lead time; compared with 5962-8002101VSA, it provides proven mechanical compatibility with legacy avionics CDIP footprints while maintaining identical timing and drive performance.
Availability
JM38510/32803BRA is available at Aetrix Electronics and suitable for avionics data backplanes, ground vehicle control units, nuclear instrumentation systems, and tactical radio baseband interfaces requiring stable component supply under extended temperature and radiation-aware conditions.
Supply support for JM38510/32803BRA 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 components for aerospace, defense, and industrial markets.
JM38510/32803BRA belongs to TI's military logic product line, engineered specifically for deterministic, noise-immune bus interfacing in safety-critical platforms where failure is not an option.
FAQ
What is the operating temperature range of the JM38510/32803BRA?
The JM38510/32803BRA is rated for continuous operation from –55°C to +125°C, validated per MIL-PRF-38535 Class B screening requirements. This range covers extreme environmental conditions found in jet engine bays, desert-deployed vehicles, and cryogenic test chambers. All electrical specifications-including propagation delay, output drive, and input thresholds-are guaranteed across this full range.
Does the JM38510/32803BRA support bidirectional data flow simultaneously?
No, the JM38510/32803BRA does not support simultaneous bidirectional operation. Data flows either from A bus to B bus (DIR = HIGH) or from B bus to A bus (DIR = LOW), as defined by the single direction-control pin. Both directions cannot be active at once; attempting concurrent use may cause bus contention and exceed absolute maximum ratings.
What is the purpose of the hysteresis on the A and B bus inputs of the JM38510/32803BRA?
The hysteresis (0.2–0.4 V) on the JM38510/32803BRA's A and B inputs increases noise immunity by creating distinct high- and low-threshold voltages (VT+ and VT−). This prevents false triggering from EMI-induced voltage fluctuations-critical in avionics and military comms where radiated emissions can exceed 200 mV peak-to-peak on shared bus lines.
Can the JM38510/32803BRA be used as a direct replacement for commercial SN74LS245 devices?
No, the JM38510/32803BRA is not a drop-in replacement for commercial SN74LS245 variants. While functionally identical, it uses a CDIP-20 package with SNPB leads, operates across –55°C to +125°C, and undergoes MIL-PRF-38535 Class B screening. Substituting it into a commercial design requires validation of thermal, mechanical, and reliability margins-not just logic compatibility.
How does the OE pin function in the JM38510/32803BRA?
The OE (output enable) pin on the JM38510/32803BRA is active-low: when OE = LOW, all eight transceiver channels operate normally based on DIR state; when OE = HIGH, all A and B pins enter high-impedance state (<1 µA leakage), effectively isolating both buses. This enables safe hot-swap, power sequencing, and fault containment in multi-node systems.
JM38510/32803BRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
JM38510/32803BRA FAQ
1.How can I place an order for JM38510/32803BRA through Aetrix?
Please submit a Request for Quotation (RFQ) for JM38510/32803BRA 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 JM38510/32803BRA reliable?
The price and inventory of JM38510/32803BRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JM38510/32803BRA is usually 5 days.
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JM38510/32803BRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JM38510/32803BRA 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 JM38510/32803BRA?
For technical support, including JM38510/32803BRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JM38510/32803BRA requirements.
6.How does Aetrix verify that JM38510/32803BRA is sourced from the original manufacturer or authorized distributors?
All JM38510/32803BRA 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 JM38510/32803BRA meets industry standards.
7.What is the process for return or replacement of JM38510/32803BRA?
All JM38510/32803BRA units undergo pre-shipment inspection (PSI). If there is an issue with JM38510/32803BRA, 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 JM38510/32803BRA part is unused and in its original packaging.
Return procedure for JM38510/32803BRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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