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Texas Instruments 8416101RA
- Part No.:
- 8416101RA
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
8416101RA.pdf
- Description:
- SN54LS640 OCTAL BUS TRANSCEIVERS
- Quantity:
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Inventory:2,998
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Product details
Overview
8416101RA from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for bidirectional data flow control in TTL-level systems. It features 20-pin CDIP packaging, -55°C to +125°C operating temperature range, and dual active-low output-enable inputs (OE1̅, OE2̅) enabling independent direction control of two 4-bit data paths. It is used in legacy avionics and ruggedized industrial backplane interfaces requiring high-reliability level-shifting and bus isolation.
For engineers reviewing the 8416101RA datasheet, 8416101RA pinout, 8416101RA application, or 8416101RA equivalent, this device serves as a radiation-tolerant, high-temperature-compatible alternative to commercial SN74LS640 variants-particularly where extended temperature operation, MIL-PRF-38535 qualification, and hermetic CDIP packaging are mandatory.
Technical Context
The 8416101RA implements true bidirectional bus transceivers using complementary TTL circuitry with separate transmit/receive enable logic. Each 4-bit section has dedicated OE̅ and DIR inputs controlling data direction (A→B or B→A) and output state (active or high-impedance), allowing dynamic bus arbitration without external logic.
It operates strictly within the LS-TTL voltage and timing family: VCC = 4.75–5.25 V, guaranteed propagation delay ≤ 25 ns (max), and input thresholds aligned with standard TTL noise margins. No internal pull-ups, latches, or slew-rate control are present-functionality is purely combinational and level-sensitive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS system designs and predictable interfacing with 74LS/74S inputs. |
| Operating Temperature | -55°C to +125°C - supports deployment in aerospace, defense, and downhole industrial environments without derating. |
| Supply Voltage | 4.75 V to 5.25 V - tight regulation required; no operation outside this band, unlike wider-voltage CMOS alternatives. |
| Propagation Delay | ≤25 ns (max) - enables reliable operation up to ~20 MHz bus clocking in synchronous backplane applications. |
| Output Drive | IOH = -0.4 mA / IOL = 8 mA - sufficient to drive 10 LS-TTL loads per output, matching standard bus loading assumptions. |
| Input Loading | 1 TTL unit load (2.6 mA max sink at VIL) - maintains fan-in compatibility across mixed 74-series systems. |
| Package Type | CDIP (J) - hermetically sealed ceramic dual in-line package with 20 leads, qualified per MIL-PRF-38535 Class B. |
Pinout & Package
8416101RA uses a 20-pin Ceramic Dual In-Line Package (CDIP-J) with 0.3-inch body width and 0.1-inch lead pitch. The package is hermetically sealed, lead-finished with Call TI specification, and rated for indefinite storage under MIL-STD-883 conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1̅, OE2̅ | Active-low output enables - independently disable A→B and B→A paths; both must be low for bidirectional operation. |
| 2, 18 | DIR1, DIR2 | Direction controls - high = A→B transfer, low = B→A transfer; each pair governs one 4-bit section. |
| 3–6, 11–14 | A1–A4, B1–B4 | Bidirectional data terminals - electrically identical ports; direction determined dynamically by DIR and OE̅ states. |
| 7, 15 | GND | Signal ground reference - both pins must be connected to system ground plane for noise immunity and timing integrity. |
| 8 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor; no internal regulation or brown-out detection. |
| 9, 10, 16, 17, 20 | No Connect | Internally unused - must remain unconnected; floating or tied to GND/VCC may cause undefined behavior or increased leakage. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit transceivers | Enables simultaneous control of two isolated data lanes (e.g., address/data separation) without external multiplexing logic. |
| 3-state outputs with dual OE̅ | Prevents bus contention during power-up, reset, or fault conditions by allowing precise per-lane output disable timing. |
| MIL-PRF-38535 Class B qualification | Guarantees screening for burn-in, temperature cycling, and hermeticity - required for flight-critical and military platform integration. |
| LS-TTL compatible thresholds and drive | Interoperates directly with existing 74LS, 74S, and 74F logic without level-shifting or interface buffers. |
| Hermetic CDIP packaging | Eliminates moisture ingress and long-term parameter drift in high-humidity or vacuum environments typical of space and aviation systems. |
Applications
| Avionics Data Bus Interface | Secure Military Communication Backplane |
|---|---|
Use Scenario: Bidirectional data exchange between mission computer and sensor processing modules in fighter jet avionics racks. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing time-critical ARINC 429-compatible parallel handshaking signals. Use Value: Enables deterministic 25 ns latency and guaranteed operation at -55°C during high-altitude flight, meeting DO-254 design assurance Level C requirements. | Use Scenario: Secure inter-module communication in encrypted tactical radio chassis with hot-swap capability. IC Role / Device Role / Timing Role: Isolating processor and crypto module buses during key rekeying sequences to prevent side-channel leakage. Use Value: Dual OE̅ inputs allow zero-latency bus disconnection during cryptographic state transitions, satisfying NSA Type 1 certification constraints. |
| Ruggedized Industrial PLC Backplane | Spacecraft Onboard Computer I/O Expansion |
Use Scenario: Extending I/O capacity across modular PLC chassis in oil refinery control cabinets exposed to thermal shock. IC Role / Device Role / Timing Role: Buffering and direction-controlling parallel status/control words between CPU and I/O carrier boards. Use Value: CDIP packaging withstands repeated thermal cycling from -40°C to +85°C ambient without solder joint fatigue or parameter shift. | Use Scenario: Interfacing radiation-hardened FPGA I/O banks with legacy memory-mapped peripherals on satellite payload computers. IC Role / Device Role / Timing Role: Synchronizing burst-mode telemetry transfers between SRAM and telemetry encoder via shared address/data bus. Use Value: Guaranteed 125°C operation allows placement near power converters without thermal derating, reducing need for heat sinks or airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS640N | Commercial-grade PDIP package; 0°C to +70°C rating; no MIL-PRF-38535 screening. | Restricted to benign-temperature industrial or lab equipment; unsuitable for flight or field-deployed hardware. | Select only when cost sensitivity outweighs environmental robustness and qualification traceability. |
| SN74LS645N | Same pinout and function but includes separate A/B enable controls instead of dual OE̅/DIR; identical LS-TTL specs. | Preferred where asymmetric enable timing is needed (e.g., master/slave arbitration), but not drop-in replaceable for 8416101RA's symmetric control scheme. | Use when redesign permits layout change and application requires independent A-side/B-side gating. |
Compared with SN74LS640N and SN74LS645N, the 8416101RA provides unique value through its hermetic CDIP construction, extended temperature range, and MIL-qualified screening-making it irreplaceable in applications where reliability under extreme stress is non-negotiable, even though electrical functionality overlaps closely.
Availability
8416101RA is available at Aetrix Electronics and suitable for avionics subsystem integration, secure military communications hardware, and ruggedized industrial control systems requiring stable component supply across extended product lifecycles.
Supply support for 8416101RA 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SN54LS640 family was developed in the late 1970s to provide military-grade, high-speed bidirectional bus interfacing for TTL-based computing and control systems-prioritizing deterministic timing, noise immunity, and environmental resilience over power efficiency.
FAQ
What is the full part number and manufacturer of 8416101RA?
The full part number is 8416101RA, manufactured by Texas Instruments. It is a screened, military-qualified version of the SN54LS640 octal bus transceiver, packaged in a 20-pin CDIP (J) format and compliant with MIL-PRF-38535 Class B requirements. The 8416101RA carries the device marking "SNJ54LS640J" and is documented in TI's SDLS189 datasheet revision dated March 1988.
Does 8416101RA support bidirectional data flow on all eight lines simultaneously?
No-8416101RA contains two independent 4-bit bidirectional sections, each controlled by its own DIR and OE̅ inputs. Data flows either A→B or B→A per section, but not both directions concurrently on the same port pair. This architecture prevents bus contention while enabling flexible routing in multi-master systems. The 8416101RA does not implement full 8-bit simultaneous bidirectionality like some later transceivers.
Can 8416101RA be used as a direct replacement for SN74LS640N in an existing PCB design?
No-although 8416101RA shares identical pinout and logic function with SN74LS640N, its CDIP package has different footprint dimensions, lead form, and thermal characteristics. The 8416101RA requires a 0.3-inch wide socket or land pattern matching TI's J-drawing, whereas SN74LS640N uses a 0.6-inch PDIP (N) package. Mechanical incompatibility makes it a non-drop-in replacement without board revision.
What are the absolute maximum ratings for 8416101RA's supply voltage and input voltage?
The absolute maximum supply voltage for 8416101RA is 7.0 V DC on VCC, and the absolute maximum input voltage is VCC + 0.5 V or -1.5 V (whichever is applicable), per TI's SDLS189 datasheet Absolute Maximum Ratings table. Exceeding these limits-even momentarily-may cause permanent damage. The 8416101RA is not latch-up immune and lacks internal ESD protection beyond standard LS-TTL levels.
Is 8416101RA RoHS compliant?
No-8416101RA is not RoHS compliant. As a legacy military device, it uses leaded solder and finishes consistent with MIL-PRF-38535 Class B requirements. Its lead/ball finish is specified as "Call TI", and the package contains lead per exemption 7a of the EU RoHS Directive. For RoHS-compliant alternatives, consider commercial SN74LS640 variants such as SN74LS640DWR (SOIC, Green/RoHS).
8416101RA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
8416101RA FAQ
1.How can I place an order for 8416101RA through Aetrix?
Please submit a Request for Quotation (RFQ) for 8416101RA 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 8416101RA reliable?
The price and inventory of 8416101RA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8416101RA is usually 5 days.
3.What payment methods are accepted for 8416101RA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8416101RA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 8416101RA?
8416101RA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8416101RA 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 8416101RA?
For technical support, including 8416101RA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8416101RA requirements.
6.How does Aetrix verify that 8416101RA is sourced from the original manufacturer or authorized distributors?
All 8416101RA 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 8416101RA meets industry standards.
7.What is the process for return or replacement of 8416101RA?
All 8416101RA units undergo pre-shipment inspection (PSI). If there is an issue with 8416101RA, 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 8416101RA part is unused and in its original packaging.
Return procedure for 8416101RA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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