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Texas Instruments SN74AHCT245PWRG4
- Part No.:
- SN74AHCT245PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT245PWRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,796
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Product details
Overview
SN74AHCT245PWRG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 5 V buses. It operates from 4.5 V to 5.5 V, accepts TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), delivers ±8 mA output drive, and supports bus isolation via active-low OE and direction control (DIR). It is used in industrial control backplanes requiring level translation and signal gating.
For engineers reviewing the SN74AHCT245PWRG4 datasheet, SN74AHCT245PWRG4 pinout, SN74AHCT245PWRG4 application, or SN74AHCT245PWRG4 equivalent, this page provides verified package mapping (TSSOP-20), functional mode table, switching timing (tPLH/tPHL ≤ 10 ns @ 15 pF), thermal resistance (RθJA = 122.3 °C/W), and confirmed alternatives for 5 V bus interface designs.
Technical Context
The SN74AHCT245PWRG4 implements dual 8-bit bidirectional I/O paths controlled by DIR (data flow direction) and OE (output enable). Its CMOS design with TTL-compatible input thresholds enables reliable interfacing between legacy 5 V TTL logic and modern 5 V CMOS systems. The device features slow edge rates to suppress output ringing and supports voltage translation from 3.3 V logic driving into 5 V buses.
It operates across –40°C to 125°C, meets JESD 17 latch-up immunity (>250 mA), and exhibits low quiescent current (ICC ≤ 40 µA). All inputs tolerate up to 5.5 V regardless of VCC, and outputs are specified for ±25 mA DC drive per pin with 15 pF/50 pF load timing validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V logic rails and tolerates supply droop during transient loading. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches TTL logic levels, enabling direct connection to legacy 5 V microcontrollers and FPGAs without level shifters. |
| Output Drive | ±8 mA @ VOH/VOL - Sufficient for driving multiple 5 V CMOS loads (fan-out ≥ 10) while maintaining rail-to-rail swing under typical loads. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns @ CL = 15 pF - Enables reliable operation in high-speed digital backplanes up to ~50 MHz clock domains. |
| Operating Temperature | –40°C to +125°C - Qualified for extended industrial environments including motor drives, PLCs, and power supply monitoring circuits. |
| ESD Rating | HBM ±2000 V - Meets IEC 61000-4-2 Level 2 requirements for board-level robustness in assembly and field use. |
| Thermal Resistance | RθJA = 122.3 °C/W (TSSOP-20) - Requires minimal heatsinking; continuous operation at full drive possible with standard PCB copper pour. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A; determines bus orientation during active state. |
| 2–9 (A1–A8) | Port A bidirectional I/O | Connects to source bus; driven high/low or tri-stated based on DIR and OE states. |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance connection. |
| 11–18 (B1–B8) | Port B bidirectional I/O | Connects to destination bus; mirrors A-port behavior with direction reversed per DIR. |
| 19 (OE) | Active-low output enable | Low = transceiver enabled; High = all A/B pins enter high-impedance state for bus isolation. |
| 20 (VCC) | Positive supply | 5 V nominal supply; bypass capacitor (0.1 µF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 0.8 V / 2.0 V thresholds - eliminates need for external level-shifting circuitry when interfacing with legacy 5 V TTL devices. |
| Slow edge rate control | Minimizes overshoot/undershoot and EMI - critical for clean signal integrity on long PCB traces or unterminated stubs. |
| 3-state bus isolation | OE-controlled high-Z mode prevents bus contention - allows safe hot-swapping and multi-master arbitration in shared data paths. |
| Overvoltage-tolerant inputs | Withstands VI up to 5.5 V independent of VCC - supports mixed-voltage system debugging and fault-condition resilience. |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robustness against transient ground bounce or supply coupling events. |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating and translating data between a 5 V FPGA configuration bus and a legacy 5 V peripheral controller. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A→B and B→A data flow under DIR control, with OE enabling dynamic bus partitioning during firmware updates. Use Value: Eliminates need for discrete logic gates or programmable logic; supports deterministic 10 ns propagation delay for synchronous handshaking protocols. |
Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU by connecting parallel peripherals (ADC, DAC, display driver) to a secondary 8-bit data bus. IC Role / Device Role / Timing Role: Direction-controlled data bridge allowing the MCU to read from or write to peripherals without bus contention. Use Value: Enables single-cycle read/write access with guaranteed setup/hold margins due to matched tPLH/tPHL and low skew (<1 ns). |
| Power Supply Monitoring Hub | Test Equipment Signal Gating |
Use Scenario: Aggregating voltage/current status signals from multiple isolated DC-DC modules into a centralized monitoring MCU over a shared 5 V data bus. IC Role / Device Role / Timing Role: Bus isolator activated only during polling cycles via OE, preventing noise injection from inactive modules. Use Value: Reduces system-wide EMI by >15 dB through controlled 3-state activation and slow-edge outputs. |
Use Scenario: Enabling/disabling digital stimulus signals to DUTs in automated test equipment during calibration sequences. IC Role / Device Role / Timing Role: Precision signal gate with sub-10 ns enable/disable latency (tPZH/tPHZ), synchronized to test pattern generator clocks. Use Value: Guarantees <1 ns inter-channel skew across all 8 lines, critical for timing-sensitive parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Wider VCC range (1.65–3.6 V); lower drive (±24 mA); 3.3 V native logic; no TTL input compatibility. | Targeted for 3.3 V systems only; unsuitable for 5 V TTL interfacing without external biasing. | Select when operating exclusively at 3.3 V and requiring lower power or higher speed (tPD ≈ 5.5 ns). |
| 74ACT245 | Higher drive (±24 mA); faster propagation (tPD ≈ 6 ns); same 4.5–5.5 V range; identical pinout and function. | Used where higher fan-out or tighter timing margins are needed; less tolerant of undershoot/ringing. | Prefer for high-noise environments requiring stronger drive, but verify layout for signal integrity due to faster edges. |
Compared with SN74LVC245A and 74ACT245, the SN74AHCT245PWRG4 uniquely balances TTL compatibility, 5 V operation, and controlled edge rates-making it optimal for retrofitting legacy 5 V systems where signal integrity and interoperability outweigh raw speed.
Availability
SN74AHCT245PWRG4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and power supply monitoring systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74AHCT245PWRG4 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 heritage in industry-standard logic families.
The SN74AHCT245PWRG4 belongs to TI's AHCT logic series-designed specifically for robust 5 V TTL-to-CMOS interfacing in industrial and automotive-qualified systems requiring latch-up immunity and wide temperature operation.
FAQ
What is the maximum continuous output current per pin for SN74AHCT245PWRG4?
The SN74AHCT245PWRG4 supports ±25 mA continuous output current per pin, as specified in Absolute Maximum Ratings. However, for reliable operation within recommended conditions, the device is characterized for ±8 mA output drive (IOH/IOL) while maintaining VOH ≥ 3.7 V and VOL ≤ 0.44 V at VCC = 4.5 V. Exceeding ±8 mA may degrade timing or increase junction temperature.
Does SN74AHCT245PWRG4 support 3.3 V input logic levels?
Yes, SN74AHCT245PWRG4 accepts 3.3 V logic inputs reliably: its VIH threshold is 2.0 V (min), and inputs tolerate up to 5.5 V regardless of VCC. When driven by a 3.3 V microcontroller, the 2.0 V VIH ensures solid high-level recognition, making SN74AHCT245PWRG4 ideal for 3.3 V → 5 V unidirectional or bidirectional translation.
What is the recommended bypass capacitor for SN74AHCT245PWRG4?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) is recommended for SN74AHCT245PWRG4. For systems with multiple power domains or high-frequency noise, paralleling with a 1 µF capacitor improves low-frequency decoupling. This ensures stable operation during output switching and prevents supply rail collapse.
Can SN74AHCT245PWRG4 be used in hot-swap applications?
Yes, SN74AHCT245PWRG4 supports hot-swap operation when OE is held high (disabled) during insertion. Its 3-state outputs prevent bus contention, and overvoltage-tolerant inputs (up to 5.5 V) withstand floating conditions pre-power-up. TI recommends tying OE to VCC via a pullup resistor to ensure defined high-Z state during power sequencing.
Is SN74AHCT245PWRG4 pin-compatible with other 20-pin octal transceivers?
SN74AHCT245PWRG4 uses the industry-standard 20-pin TSSOP (PW) footprint and shares identical pinout with SN74LVC245A, 74ACT245, and SN74ALS245 - including DIR, OE, A/B ports, VCC, and GND locations. Mechanical compatibility is confirmed; however, electrical differences (e.g., voltage range, drive strength) require verification before substitution.
SN74AHCT245PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT245PWRG4 FAQ
1.How can I place an order for SN74AHCT245PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT245PWRG4 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 SN74AHCT245PWRG4 reliable?
The price and inventory of SN74AHCT245PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT245PWRG4 is usually 5 days.
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Once your SN74AHCT245PWRG4 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 SN74AHCT245PWRG4?
For technical support, including SN74AHCT245PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT245PWRG4 requirements.
6.How does Aetrix verify that SN74AHCT245PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT245PWRG4 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 SN74AHCT245PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT245PWRG4?
All SN74AHCT245PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT245PWRG4, 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 SN74AHCT245PWRG4 part is unused and in its original packaging.
Return procedure for SN74AHCT245PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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