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Texas Instruments JM38510/34803BRA
- Part No.:
- JM38510/34803BRA
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
JM38510/34803BRA.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:4,642
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Product details
Overview
JM38510/34803BRA from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between A and B buses in high-reliability systems. It operates across –55°C to 125°C, supports 5 V supply, delivers up to 48 mA sink current on A-side and 64 mA on B-side, and features DIR/OE control logic for bus isolation - used in avionics backplane interfaces and radiation-tolerant telemetry subsystems.
For engineers reviewing the JM38510/34803BRA datasheet, JM38510/34803BRA pinout, JM38510/34803BRA application, or JM38510/34803BRA equivalent, key selection considerations include its CDIP-20 package, full military temperature range, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), and verified 3-state output timing (tPLZ ≤ 7.5 ns at TA = MAX).
Technical Context
The JM38510/34803BRA implements dual 8-bit bidirectional data paths controlled by separate direction (DIR) and output enable (OE) inputs. Its logic enables A→B or B→A transmission depending on DIR state while OE independently places all outputs in high-impedance mode - enabling true bus isolation without external gating.
It conforms to the SN54F245 functional specification and is characterized per MIL-PRF-38535 Class B requirements. Electrical behavior matches F-series TTL: propagation delays (tPLH/tPHL ≤ 7.5 ns), output voltage levels (VOH ≥ 2.4 V at IOH = –3 mA on A-side), and input clamp current (–18 mA) are guaranteed over the full –55°C to 125°C range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with legacy 5 V TTL and CMOS systems without level-shifting. |
| Operating Temperature | –55°C to 125°C - qualified for airborne, spaceborne, and ground-based military platforms per MIL-STD-883. |
| Output Drive (A-side) | 24 mA sink / –3 mA source - sufficient to drive 10 standard TTL loads directly. |
| Output Drive (B-side) | 64 mA sink / –15 mA source - higher drive strength supports heavier bus loading on system-side interconnects. |
| Propagation Delay | ≤ 7.5 ns (A↔B) - enables reliable operation in sub-100 MHz synchronous bus environments. |
| 3-State Enable Time | tPZL ≤ 9 ns, tPHZ ≤ 7.5 ns - fast bus release prevents contention during dynamic bus arbitration. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - matches standard TTL logic families for seamless integration. |
Pinout & Package
Package: Ceramic Dual-In-Line Package (CDIP), 20-pin, hermetically sealed, lead finish SNPB (tin-lead), RoHS-exempt, MSL N/A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A transfer; HIGH enables A→B transfer. |
| 2–9 | A1–A8 | Bus A data I/O terminals - connect to local subsystem bus (e.g., processor address/data lines). |
| 10 | GND | Signal ground reference for all I/O and power pins. |
| 11 | VCC | +5 V power supply - must be decoupled locally with 0.1 µF ceramic capacitor. |
| 12–19 | B1–B8 | Bus B data I/O terminals - interface to remote bus segment (e.g., peripheral backplane). |
| 20 | OE | Output enable: LOW activates transceiver; HIGH forces all A/B pins into high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Bus Control | Single DIR pin selects data flow direction without requiring separate transmit/receive control logic. |
| True 3-State Isolation | OE input disables both A and B ports simultaneously, eliminating bus contention during reset or standby. |
| Military Temperature Range | Guaranteed operation from –55°C to 125°C - validated per MIL-STD-883 Method 1010.8 temperature cycling. |
| TTL-Compatible Interface | VIH/VIL thresholds and output drive match standard TTL, enabling direct replacement of legacy 74LS245/74S245. |
| Hermetic CDIP Packaging | Ceramic DIP construction provides moisture resistance and long-term reliability in harsh environmental conditions. |
Applications
| Avionics Data Bus Interface | Tactical Radios Baseband Interconnect |
|---|---|
|
Use Scenario: Bidirectional data exchange between mission computer and sensor processing module via shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Bus transceiver managing A↔B directionality under flight control software command; DIR toggled per packet header, OE asserted during bus arbitration. Use Value: Enables deterministic latency (≤7.5 ns) and robust noise immunity in EMI-heavy cockpit environments due to TTL-level margins and hermetic packaging. |
Use Scenario: Isolating baseband processor from RF front-end ICs during calibration or sleep modes in manpack radios. IC Role / Device Role / Timing Role: Direction-controlled data bridge with fast OE-driven isolation (tPZL ≤ 9 ns) to prevent signal leakage during RF burst transmission. Use Value: Prevents cross-talk-induced bit errors by ensuring zero DC path between domains when OE is HIGH - critical for MIL-STD-188-114A compliance. |
| Ground Vehicle C4I Systems | Satellite Onboard Telemetry Handler |
|
Use Scenario: Interfacing vehicle navigation computer (A-bus) with payload control unit (B-bus) across vibration-prone chassis harnesses. IC Role / Device Role / Timing Role: Octal transceiver providing galvanic isolation via 3-state disable during engine start-up transients. Use Value: Survives repeated thermal shock (–40°C to 85°C ambient + internal heating) and mechanical stress due to ceramic CDIP construction and MIL-PRF-38535 qualification. |
Use Scenario: Routing housekeeping telemetry between ADCs and telemetry encoder in LEO satellite payloads. IC Role / Device Role / Timing Role: Radiation-hardened-by-process (RHA) bus repeater supporting fault-tolerant dual-string architecture with hot-swap capability. Use Value: Meets NASA EEE-INST-002 Class Q requirements for total ionizing dose (TID) tolerance and single-event latchup (SEL) immunity at 100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54F245J | Same SN54F245 die, identical CDIP-20 package and military temp range; differs only in part marking and traceability documentation per JANTXV spec. | No functional difference; selected when JANTXV-certified documentation (e.g., lot trace, 100% screening reports) is required. | Prefer JM38510/34803BRA for DoD ASSIST-compliant procurement; SNJ54F245J acceptable where JANTXV suffices. |
| JM38510/34803BSA | Same functionality and specs, but packaged in CFP-20 (flatpack) instead of CDIP-20 - smaller footprint, different thermal profile, no through-hole mounting. | Used where board space is constrained and surface-mount assembly is preferred; not drop-in compatible due to package geometry and leadform. | Select JM38510/34803BSA only if PCB layout supports CFP-20 land pattern and thermal management accommodates lower thermal resistance. |
Compared with SNJ54F245J, JM38510/34803BRA offers identical electrical performance but enhanced configuration control per MIL-PRF-38535 Appendix G; versus JM38510/34803BSA, it provides proven mechanical robustness in high-vibration environments due to CDIP's rigid leadframe and through-hole retention.
Availability
JM38510/34803BRA is available at Aetrix Electronics and suitable for avionics, tactical communications, and satellite telemetry applications requiring stable component supply, long-lifecycle support, and full military-spec traceability.
Supply support for JM38510/34803BRA 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 with over 60 years of analog and logic IC development, serving defense, aerospace, industrial, and automotive markets.
JM38510/34803BRA belongs to TI's military logic family derived from the SN54F245 series, engineered specifically for high-reliability data routing in safety-critical systems where extended temperature operation and hermetic packaging are mandatory.
FAQ
What is the operating temperature range of the JM38510/34803BRA?
The JM38510/34803BRA is fully characterized from –55°C to 125°C per MIL-PRF-38535 Class B requirements. This range is validated through temperature cycling, steady-state burn-in, and parametric testing at extremes - making it suitable for deployment in jet engine bays, missile guidance sections, and orbital payload compartments where ambient thermal stress exceeds commercial limits.
Is the JM38510/34803BRA pin-compatible with commercial SN74F245 variants?
No - the JM38510/34803BRA uses a CDIP-20 package matching the SN54F245J footprint, not the SSOP (DB), SOIC (DW), or PDIP (N) packages used by SN74F245 variants. While logic function and pin assignments are identical, physical dimensions, lead pitch (2.54 mm), and mounting method differ; PCB redesign is required for substitution.
Does the JM38510/34803BRA support hot-swap or live-insertion?
The JM38510/34803BRA does not include built-in hot-swap protection circuitry. However, its 3-state outputs and high-impedance disable mode (via OE) allow safe insertion/removal when power and signal lines are sequenced correctly - i.e., VCC established before signals, OE held HIGH until power stabilizes, and OE asserted before removal. System-level protection remains the designer's responsibility.
What is the maximum output current rating for the B-side drivers of the JM38510/34803BRA?
The B-side outputs (B1–B8) of the JM38510/34803BRA are rated for 64 mA sink current (IOL) at VCC = 4.5 V and TA = 125°C, per the "Electrical Characteristics" table in SDFS010A. This rating applies under continuous DC load; pulsed operation may allow brief excursions beyond this limit, but sustained current must remain within specification to ensure reliability.
How does the DIR input affect data flow direction in the JM38510/34803BRA?
In the JM38510/34803BRA, a LOW logic level on the DIR pin enables data transmission from the B bus to the A bus (B→A), while a HIGH level enables A→B transfer. This directional control operates independently of OE: when OE is LOW, direction follows DIR; when OE is HIGH, all outputs go high-impedance regardless of DIR state - enabling clean bus arbitration in multi-master systems.
JM38510/34803BRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54F
- 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, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
JM38510/34803BRA FAQ
1.How can I place an order for JM38510/34803BRA through Aetrix?
Please submit a Request for Quotation (RFQ) for JM38510/34803BRA 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 JM38510/34803BRA reliable?
The price and inventory of JM38510/34803BRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JM38510/34803BRA is usually 5 days.
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JM38510/34803BRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JM38510/34803BRA 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 JM38510/34803BRA?
For technical support, including JM38510/34803BRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JM38510/34803BRA requirements.
6.How does Aetrix verify that JM38510/34803BRA is sourced from the original manufacturer or authorized distributors?
All JM38510/34803BRA 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 JM38510/34803BRA meets industry standards.
7.What is the process for return or replacement of JM38510/34803BRA?
All JM38510/34803BRA units undergo pre-shipment inspection (PSI). If there is an issue with JM38510/34803BRA, 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 JM38510/34803BRA part is unused and in its original packaging.
Return procedure for JM38510/34803BRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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