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Texas Instruments SN54SC245MPWTSEP
- Part No.:
- SN54SC245MPWTSEP
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN54SC245MPWTSEP.pdf
- Description:
- 1.2-V TO 5.5-V, OCTAL BUS TRANSC
- Quantity:
- Payment:
- Shipping:
Inventory:243
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Product details
Overview
SN54SC245MPWTSEP from Texas Instruments is a radiation-tolerant octal bus transceiver with 3-state outputs, designed for space-grade digital signal routing in harsh environments. It operates across 1.2 V to 5.5 V, supports bidirectional data flow controlled by DIR and OE pins, delivers ±25 mA output drive at 5 V, and is qualified to 30 krad(Si) total ionizing dose with SEL immunity up to 43 MeV·cm²/mg - deployed in satellite command/data handling subsystems.
For engineers reviewing the SN54SC245MPWTSEP datasheet, SN54SC245MPWTSEP pinout, SN54SC245MPWTSEP application, or SN54SC245MPWTSEP equivalent, this page delivers verified radiation-hardened logic specifications, TSSOP-20 pin mapping, space-enhanced plastic (SEP) packaging details, and functional alternatives for high-reliability aerospace bus interface design.
Technical Context
The SN54SC245MPWTSEP implements eight independent bidirectional CMOS transceiver channels sharing two global control signals: DIR determines direction (A→B or B→A), while active-low OE enables/disables all outputs simultaneously into high-impedance state. Its TTL-compatible inputs accept slow-rising signals only when properly terminated, and balanced 3-state outputs support symmetrical sourcing/sinking up to ±25 mA at 5 V.
Radiation hardening is achieved via space-enhanced plastic (SEP) construction - including gold bondwire, NiPdAu lead finish, controlled baseline fabrication, and lot-level TID RLAT testing to 30 krad(Si). Single-event latch-up immunity is confirmed to LET = 43 MeV·cm²/mg, and it meets NASA ASTM E595 outgassing requirements for vacuum operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 5.5 V - enables interoperability across legacy 3.3-V and modern low-voltage 1.2-V/1.8-V logic domains without level shifters. |
| Output Drive Strength | ±25 mA at 5 V - sufficient to drive 50-pF loads with <9.3 ns propagation delay (CL = 50 pF), supporting high-speed bus arbitration. |
| Total Ionizing Dose (TID) | 30 krad(Si) - qualified per radiation lot acceptance testing (RLAT) on every wafer lot for long-duration LEO/GEO missions. |
| SEL Immunity | Immune to LET ≤ 43 MeV·cm²/mg - eliminates latch-up risk under proton/heavy-ion exposure in deep-space trajectories. |
| Operating Temperature | –55°C to +125°C - validated for unheated external payload bays and thermally constrained avionics enclosures. |
| Input Voltage Tolerance | 5.5 V tolerant - allows safe interfacing with mixed-voltage systems where input signals may exceed VCC. |
| Propagation Delay | 4.4 ns min / 9.3 ns max (5 V, CL = 50 pF) - ensures deterministic timing margins in synchronous bus protocols like MIL-STD-1553 auxiliary interfaces. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW) with 0.65-mm pitch, 6.5 mm × 6.4 mm footprint, and 6.5 mm × 4.4 mm body size - optimized for high-density PCB layouts in SWaP-constrained spacecraft modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | L = B→A data flow; H = A→B data flow - single-pin bidirectional bus arbitration without external logic. |
| OE (Pin 19) | Active-low output enable | Drives all eight transceiver outputs into high-Z when high - enables bus sharing among multiple masters/slaves. |
| A1–A8 (Pins 2–9) | Port A I/O channels | Eight bidirectional data lines tied to local controller or FPGA I/O banks - each electrically isolated when OE = high. |
| B1–B8 (Pins 11–18) | Port B I/O channels | Eight bidirectional data lines routed to remote subsystems (e.g., sensors, actuators, memory) - supports hot-swap isolation. |
| VCC (Pin 20) | Positive supply | Accepts 1.2–5.5 V; powers internal logic and output drivers - decoupling required per TI layout guidelines for noise suppression. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and supply currents - must be low-inductance plane connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Space Enhanced Plastic (SEP) | Gold bondwire, NiPdAu lead finish, single fab/assembly site, full traceability - eliminates counterfeit risk and ensures consistent radiation response. |
| TTL-Compatible CMOS Inputs | VIH/VIL thresholds scaled for 1.2–5.5 V operation - enables direct interface with legacy TTL peripherals without level translation. |
| Balanced 3-State Outputs | Matched sourcing/sinking capability (±25 mA @ 5 V) - prevents bus contention skew and supports robust wired-OR configurations. |
| 5.5-V Tolerant Inputs | Accepts input voltages up to 5.5 V regardless of VCC - simplifies integration in mixed-supply systems with legacy 5-V sensor interfaces. |
| High-Z Power-Up Safety | OE tied to VCC via 10-kΩ pull-up ensures outputs remain disabled until system firmware asserts valid DIR/OE states - prevents spurious bus writes. |
Applications
| Onboard Data Bus Isolation | Satellite Payload Interface |
|---|---|
Use Scenario: Isolating processor memory bus from radiation-sensitive peripheral modules during fault recovery. IC Role / Device Role / Timing Role: Bidirectional octal transceiver enabling controlled data exchange between flight computer and star tracker, with OE-gated high-Z during reset sequences. Use Value: Prevents bus contention during power cycling; DIR-controlled directionality eliminates need for separate transmit/receive buffers. |
Use Scenario: Interfacing a radiation-hardened FPGA to analog-to-digital converters in Earth observation payloads. IC Role / Device Role / Timing Role: Level-shifting and bus-driving transceiver connecting 1.8-V FPGA I/O to 3.3-V ADC parallel interface with sub-10 ns timing margins. Use Value: 5.5-V tolerant inputs tolerate ADC output overshoot; ±25 mA drive sustains signal integrity over 12-cm PCB traces. |
| Command & Telemetry Multiplexing | Redundant Avionics Cross-Tie |
Use Scenario: Time-shared telemetry downlink between dual-redundant command processors and S-band transceiver. IC Role / Device Role / Timing Role: Octal bus switch enabling one processor to drive telemetry data onto shared serial bus while other remains isolated. Use Value: OE-controlled high-Z state guarantees no leakage current or signal corruption when inactive processor is powered down. |
Use Scenario: Enabling cross-strapping between primary and backup attitude control computers during failover. IC Role / Device Role / Timing Role: Bidirectional data bridge allowing synchronized state transfer between redundant flight controllers using common memory-mapped registers. Use Value: SEL immunity ensures uninterrupted cross-tie operation during solar particle events; –55°C to +125°C range covers orbital thermal extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54AC245FK | Non-SEP ceramic package; rated to 100 krad(Si) but lacks per-lot TID RLAT; SEL tested to 37 MeV·cm²/mg only. | Approved for Class S space programs with lower TID requirements; not qualified for extended GEO missions. | Choose when cost sensitivity outweighs per-lot radiation verification needs and mission duration is <5 years. |
| SN54LVC245A-SP | LVCMOS logic family; 1.65–3.6 V supply range only; higher ICC (1.1 mA max vs. 750 µA at 1.2 V); identical TSSOP-20 pinout. | Optimized for low-power, mid-voltage spacecraft subsystems; unsuitable for 5-V legacy interfaces or 1.2-V ultra-low-power domains. | Prefer for new designs targeting 3.3-V FPGA-based avionics where radiation tolerance matches SN54SC245MPWTSEP but voltage range is constrained. |
Compared with SNJ54AC245FK and SN54LVC245A-SP, SN54SC245MPWTSEP uniquely combines 30 krad(Si) per-lot qualification, 1.2–5.5 V flexibility, and 5.5-V input tolerance - making it the only option for mixed-voltage, long-duration missions requiring guaranteed radiation lot acceptance testing.
Availability
SN54SC245MPWTSEP is available at Aetrix Electronics and suitable for satellite command/data handling, onboard telemetry multiplexing, and radiation-hardened FPGA interface applications requiring stable component supply across extended production lifecycles.
Supply support for SN54SC245MPWTSEP 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 specializing in analog, embedded processing, and space-grade logic solutions with over 50 years of aerospace heritage.
The SN54SC245MPWTSEP belongs to TI's Space Enhanced Plastic (SEP) logic portfolio, engineered specifically for radiation-tolerant digital interfacing in satellites, launch vehicles, and deep-space probes where reliability under ionizing radiation is non-negotiable.
FAQ
What is the radiation qualification basis for SN54SC245MPWTSEP?
SN54SC245MPWTSEP is characterized to 30 krad(Si) total ionizing dose with per-wafer-lot radiation lot acceptance testing (TID RLAT), and single-event latch-up immune up to LET = 43 MeV·cm²/mg. It also meets NASA ASTM E595 outgassing requirements for vacuum compatibility - all verified per VID V62/23616 vendor item drawing.
Does SN54SC245MPWTSEP support 1.2-V operation with full timing performance?
Yes, SN54SC245MPWTSEP is fully specified down to 1.2 V: propagation delay is 32.2–68.4 ns (CL = 15 pF), supply current is 2–750 µA, and VIH/VIL thresholds scale with VCC. This enables direct integration with ultra-low-power 1.2-V FPGAs and microcontrollers in battery-constrained CubeSat platforms.
Can SN54SC245MPWTSEP interface directly with 5-V TTL devices?
Yes, SN54SC245MPWTSEP features 5.5-V tolerant inputs and TTL-compatible VIH/VIL thresholds - allowing safe, level-shift-free connection to legacy 5-V TTL peripherals. Its outputs swing rail-to-rail (VOL ≤ 0.35 V, VOH ≥ VCC – 0.1 V at 5 V), ensuring compatible logic levels.
What is the recommended power-up sequencing for SN54SC245MPWTSEP?
TI recommends tying OE to VCC via a 10-kΩ pull-up resistor to ensure all outputs remain in high-impedance state until firmware initializes DIR and OE. VCC should be applied before any input signals; no strict sequencing is required between DIR and OE, but both must be stable before enabling outputs.
Is SN54SC245MPWTSEP pin-compatible with commercial SC245 variants?
SN54SC245MPWTSEP shares identical TSSOP-20 pinout and function mapping with SN74SC245 and SNJ54SC245, including DIR, OE, A1–A8, B1–B8, VCC, and GND placements. However, SEP-specific construction (gold bondwire, NiPdAu finish) and radiation screening preclude substitution without requalification in flight hardware.
SN54SC245MPWTSEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54SC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 1.2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN54SC245MPWTSEP FAQ
1.How can I place an order for SN54SC245MPWTSEP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54SC245MPWTSEP 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 SN54SC245MPWTSEP reliable?
The price and inventory of SN54SC245MPWTSEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54SC245MPWTSEP is usually 5 days.
3.What payment methods are accepted for SN54SC245MPWTSEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54SC245MPWTSEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54SC245MPWTSEP?
SN54SC245MPWTSEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54SC245MPWTSEP 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 SN54SC245MPWTSEP?
For technical support, including SN54SC245MPWTSEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54SC245MPWTSEP requirements.
6.How does Aetrix verify that SN54SC245MPWTSEP is sourced from the original manufacturer or authorized distributors?
All SN54SC245MPWTSEP 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 SN54SC245MPWTSEP meets industry standards.
7.What is the process for return or replacement of SN54SC245MPWTSEP?
All SN54SC245MPWTSEP units undergo pre-shipment inspection (PSI). If there is an issue with SN54SC245MPWTSEP, 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 SN54SC245MPWTSEP part is unused and in its original packaging.
Return procedure for SN54SC245MPWTSEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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