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Texas Instruments SN74ABT245BPWG4
- Part No.:
- SN74ABT245BPWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT245BPWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
SN74ABT245BPWG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V TTL systems. It features high-drive capability (−32 mA IOH, 64 mA IOL), hot-insertion support via Ioff and power-up 3-state, and operates across −40°C to 85°C. Used in industrial backplane interfaces and legacy system upgrades requiring robust level-shifting and bus isolation.
For engineers reviewing the SN74ABT245BPWG4 datasheet, SN74ABT245BPWG4 pinout, SN74ABT245BPWG4 application, or SN74ABT245BPWG4 equivalent, key selection criteria include its 20-pin TSSOP package, direction-control (DIR) and output-enable (OE) logic interface, ground-bounce performance (<1 V VOLP), latch-up immunity (>500 mA), and compatibility with 5-V CMOS/TTL logic families.
Technical Context
This device implements dual 8-bit bidirectional data paths controlled by DIR (data flow direction) and OE (output enable/disable). Its Ioff circuitry actively disables outputs when VCC = 0 V, preventing backflow current during hot insertion or partial power-down. The power-up 3-state feature ensures outputs remain high-impedance until VCC stabilizes, eliminating bus contention at power-on.
Electrical behavior is defined for VCC = 4.5–5.5 V, with guaranteed VOH ≥ 2.0 V at IOH = −32 mA and VOL ≤ 0.55 V at IOL = 64 mA. Switching performance includes tPLH/tPHL ≤ 3.9 ns (A↔B), tPZL/tPHZ ≤ 6.2 ns (OE→output), and tsk(o) ≤ 0.5 ns skew - all measured at CL = 50 pF and TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS supply rails without regulation overhead |
| IOH / IOL | −32 mA / 64 mA - drives heavy capacitive loads (e.g., long traces, multiple inputs) without signal degradation |
| VOLP (Ground Bounce) | <1 V at VCC = 5 V, TA = 25°C - minimizes noise coupling into shared ground planes during switching |
| Latch-Up Immunity | >500 mA per JEDEC JESD17 - withstands transient overcurrent events without destructive failure |
| tPLH / tPHL | ≤3.9 ns (A↔B, CL = 50 pF) - supports >200 MHz data rates in point-to-point or lightly loaded bus topologies |
| ESD Protection | 2000-V HBM, 200-V MM - survives handling and board-level ESD events without external protection diodes |
| Ioff Current | ±100 µA at VCC = 0 V - blocks damaging reverse current during live insertion or mixed-voltage hot-swap |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm pitch, exposed pad not present. RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Port A bidirectional data lines - connect to source bus; direction determined by DIR state |
| 9 | DIR | Direction control: LOW = B→A, HIGH = A→B - synchronous with OE, no internal delay |
| 10 | GND | Power ground reference - must be low-impedance connection to minimize VOLP and noise coupling |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Inputs/Outputs | Port B bidirectional data lines - connect to destination bus; electrically identical to A-side |
| 19 | OE | Output enable: LOW = active transceiver, HIGH = 3-state isolation - overrides DIR when disabled |
| 20 | VCC | Positive supply (4.5–5.5 V) - requires local 0.1 µF ceramic decoupling within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Ioff + power-up 3-state eliminates need for external sequencing or isolation logic during live board replacement |
| High-drive outputs | 64-mA sink capability enables direct drive of 10+ TTL inputs or 50-Ω transmission lines without buffers |
| Low ground bounce | <1 V VOLP reduces simultaneous switching noise (SSN), critical for mixed-signal or precision analog co-location |
| Robust ESD/latch-up | 2000-V HBM and >500-mA latch-up rating allow use in unshielded industrial enclosures without derating |
| Wide temperature range | −40°C to +85°C operation supports deployment in factory automation, transportation, and outdoor infrastructure |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from expansion slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level translator and bus driver enabling hot-swappable I/O modules without system reset. Use Value: Ioff prevents backfeed during module insertion; 64-mA IOL drives long backplane traces with <3.9 ns propagation delay. |
Use Scenario: Extending ISA or VME bus segments between legacy instrumentation and modern controller cards. IC Role / Device Role / Timing Role: Octal transceiver providing direction-controlled data routing and 3-state isolation between bus segments. Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA ensures TTL-compatible logic thresholds across extended trace lengths. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
|
Use Scenario: Dynamically reconfiguring DUT signal paths in ATE systems using FPGA-controlled bus direction. IC Role / Device Role / Timing Role: Low-skew (≤0.5 ns) bidirectional switch enabling precise timing alignment between stimulus and measurement channels. Use Value: tsk(o) ≤ 0.5 ns and matched tPLH/tPHL ensure deterministic setup/hold margins for high-speed digital pattern generation. |
Use Scenario: Interfacing microcontroller GPIOs to high-current solenoid drivers and sensor arrays in production test fixtures. IC Role / Device Role / Timing Role: Logic-level translator and current booster isolating MCU pins from noisy actuator loads. Use Value: −32 mA IOH drives LED status indicators directly; Ioff protects MCU during fixture power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | 3.3-V only (1.65–3.6 V), lower drive (−24/24 mA), no Ioff, higher speed (tPD ≈ 2.8 ns) | Suitable for 3.3-V-only systems; lacks hot-insertion capability and 5-V tolerance | Select when operating exclusively at 3.3 V and prioritizing speed over robustness or mixed-voltage compatibility |
| SN74AHCT245PW | 5-V tolerant inputs, same 5-V VCC range, lower drive (−8/8 mA), no Ioff, higher VOL (≤0.8 V) | Compatible with 5-V logic but cannot drive heavy loads or survive hot-insertion events | Select for cost-sensitive 5-V designs where load capacitance is <20 pF and hot-swap is not required |
Compared with SN74LVC245APWR and SN74AHCT245PW, the SN74ABT245BPWG4 uniquely delivers 5-V operation with hot-insertion safety, 64-mA sink strength, and sub-1-V ground bounce - making it irreplaceable in industrial backplanes and legacy upgrade paths demanding reliability under dynamic power conditions.
Availability
SN74ABT245BPWG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and automated test fixture control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT245BPWG4 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 logic solutions, with decades of experience in high-reliability interface ICs.
The SN74ABT245B product line delivers robust 5-V octal transceivers optimized for industrial, automotive, and communications infrastructure where hot-swap resilience, noise immunity, and bus integrity are critical.
FAQ
What is the maximum recommended operating temperature for SN74ABT245BPWG4?
The SN74ABT245BPWG4 is rated for continuous operation from −40°C to +85°C ambient temperature. This range is validated per JEDEC JESD78 and applies to all electrical specifications in the datasheet. Operation beyond +85°C may cause parametric shift or accelerated wear; thermal derating is not supported.
Does SN74ABT245BPWG4 support hot insertion, and how is it implemented?
Yes, SN74ABT245BPWG4 supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V (blocking reverse current), and power-up 3-state holds outputs high-impedance until VCC reaches valid logic levels. Both functions are inherent to the silicon design and require no external components.
What is the purpose of the DIR and OE pins on SN74ABT245BPWG4?
DIR controls data direction: LOW enables B→A transfer, HIGH enables A→B transfer. OE enables/disables all outputs: LOW activates the transceiver, HIGH forces all A/B pins into high-impedance state regardless of DIR. OE has priority over DIR and is essential for bus isolation.
Can SN74ABT245BPWG4 interface between 3.3-V and 5-V logic domains?
No, SN74ABT245BPWG4 is a 5-V-only device (VCC = 4.5–5.5 V) with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). It accepts 3.3-V logic-high signals but cannot safely drive 3.3-V inputs due to VOH ≥ 2.0 V (exceeding 3.3-V VIH max); level-shifting circuitry is required for bidirectional 3.3/5-V interfacing.
What PCB layout considerations are critical for SN74ABT245BPWG4 stability?
Place a 0.1 µF ceramic capacitor between VCC and GND within 5 mm of pins 20 and 10. Use short, low-inductance traces for DIR and OE to minimize noise-induced glitches. Route A/B bus lines differentially where possible, and avoid routing sensitive analog traces parallel to the transceiver's GND path to limit VOLP coupling.
SN74ABT245BPWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ABT245BPWG4 FAQ
1.How can I place an order for SN74ABT245BPWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BPWG4 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 SN74ABT245BPWG4 reliable?
The price and inventory of SN74ABT245BPWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BPWG4 is usually 5 days.
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SN74ABT245BPWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT245BPWG4 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 SN74ABT245BPWG4?
For technical support, including SN74ABT245BPWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BPWG4 requirements.
6.How does Aetrix verify that SN74ABT245BPWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BPWG4 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 SN74ABT245BPWG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT245BPWG4?
All SN74ABT245BPWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BPWG4, 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 SN74ABT245BPWG4 part is unused and in its original packaging.
Return procedure for SN74ABT245BPWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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