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Texas Instruments SN74AHCT245PWR
- Part No.:
- SN74AHCT245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT245PWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,458
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Product details
Overview
SN74AHCT245PWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between 3.3 V and 5 V systems. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), delivers ±8 mA output drive, and features direction control (DIR) and output enable (OE) pins for flexible data routing in industrial control and embedded interface applications.
For engineers reviewing the SN74AHCT245PWR datasheet, SN74AHCT245PWR pinout, SN74AHCT245PWR application, or SN74AHCT245PWR equivalent, key selection criteria include its 20-pin TSSOP package, 3.3 V → 5 V level translation capability, 10 ns typical propagation delay (CL = 15 pF), and guaranteed 250 mA latch-up immunity per JESD17 - critical for robust bus isolation and signal conditioning in mixed-voltage digital systems.
Technical Context
The SN74AHCT245PWR implements dual-bus bidirectional data flow controlled by a single DIR input: logic low enables B→A transmission, logic high enables A→B transmission. Its OE input independently places all eight I/Os into high-impedance state, enabling true bus isolation during reset or power sequencing.
Designed using advanced CMOS technology, it combines TTL-compatible input thresholds with 5 V supply operation and slow edge rates to minimize output ringing and overshoot-making it suitable for driving unterminated or lightly loaded PCB traces without external termination.
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 tolerance to supply ripple. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable recognition of 3.3 V LVTTL outputs as valid logic levels. |
| Output Drive | ±8 mA at VCC = 4.5 V - sufficient to drive multiple CMOS loads while maintaining noise margin. |
| Propagation Delay | tPLH/tPHL = 10 ns max (CL = 15 pF) - supports 50+ MHz bus toggle rates in point-to-point configurations. |
| Latch-up Immunity | >250 mA per JESD17 - prevents destructive latch-up under transient overvoltage or ESD stress. |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - meets industrial handling requirements without special ESD controls. |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, exposed thermal pad (non-electrical), RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Determines data flow direction: low = B→A, high = A→B; must be driven to defined logic level. |
| A1–A8 (Pins 2–9) | Port A I/O | Bidirectional data lines connected to source bus; high-impedance when OE = high. |
| GND (Pin 10) | Ground reference | Primary return path for all signals and supply current; requires low-inductance connection to system ground plane. |
| B8–B1 (Pins 11–18) | Port B I/O | Bidirectional data lines connected to destination bus; isolated when OE = high. |
| OE (Pin 19) | Output enable input | Active-low control: low = enabled transceiver, high = all A/B pins in high-Z state for bus isolation. |
| VCC (Pin 20) | Positive supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 3.3 V logic high (≥2.0 V) and low (≤0.8 V) directly - eliminates need for external level-shifting circuitry. |
| Asymmetric bus isolation | OE pin disables both ports simultaneously while DIR remains functional - enables safe hot-swap and partial system reset. |
| Controlled edge rates | Slow rise/fall times reduce EMI and output ringing on long or unterminated traces - improves signal integrity without series resistors. |
| High noise immunity | VIH(D)/VIL(D) = 2.0 V / 0.8 V dynamic thresholds - maintains reliable switching in electrically noisy industrial environments. |
| Low static power | ICC ≤ 40 µA at VCC = 5.5 V - minimizes quiescent current in always-on interface circuits. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating legacy 5 V I/O modules from a 3.3 V ARM-based controller in programmable logic controller chassis. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver managing data exchange between CPU and peripheral slots during runtime and reset sequences. Use Value: Eliminates need for discrete level shifters while providing simultaneous A↔B direction control and hardware-enforced bus isolation via OE. |
Use Scenario: Expanding GPIO count of an STM32 microcontroller to drive multiple SPI peripherals sharing a common data bus. IC Role / Device Role / Timing Role: Octal 3-state buffer enabling time-multiplexed access to shared SDO/MISO lines across multiple slave devices. Use Value: Reduces PCB layer count by replacing eight discrete buffers with one compact TSSOP-20 device supporting 10 ns timing margins. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing a 5 V CAN transceiver PHY with a 3.3 V microcontroller in a body control unit operating from –40°C to +125°C. IC Role / Device Role / Timing Role: Voltage-level translating bus driver ensuring clean signal transfer between domains while meeting AEC-Q100 temperature requirements. Use Value: Qualified for extended temperature range and provides 250 mA latch-up immunity - critical for reliability in automotive power domain transients. |
Use Scenario: Generating synchronized 8-bit parallel test vectors from a pattern generator FPGA to DUTs with mixed 3.3 V/5 V logic families. IC Role / Device Role / Timing Role: Programmable-direction bus driver allowing dynamic reversal of stimulus/data flow without changing PCB layout. Use Value: DIR-controlled bidirectionality enables single hardware setup to validate both input capture and output drive behavior of DUTs. |
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 | Lower VCC range (1.65–3.6 V), 3.3 V only; higher speed (tPD = 5.3 ns); lower drive (±24 mA) | Not suitable for 5 V systems; requires separate 3.3 V rail; better for high-speed 3.3 V-only buses | Select when interfacing two 3.3 V domains where speed > 50 MHz is required and 5 V compatibility is unnecessary. |
| 74AVCH245TTR | Wider VCC range (1.2–3.6 V), dual-supply capable; supports 1.8 V ↔ 3.3 V translation; smaller 20-pin TSSOP (6.5 × 4.4 mm same footprint) | Cannot operate at 5 V; optimized for ultra-low-voltage mobile interfaces; no 5 V tolerance on inputs | Prefer for battery-powered or low-power portable equipment requiring sub-2 V logic translation with identical board footprint. |
Compared with SN74LVC245APWR and 74AVCH245TTR, the SN74AHCT245PWR uniquely supports 5 V operation and TTL input compatibility - making it the only viable choice for bridging legacy 5 V infrastructure with modern 3.3 V controllers without additional level-shifting components.
Availability
SN74AHCT245PWR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT245PWR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic IC design.
The SN74AHCT245PWR belongs to TI's industry-standard 74AHCT logic family, engineered specifically for robust 3.3 V ↔ 5 V bidirectional bus interfacing in harsh industrial and automotive environments.
FAQ
What is the maximum operating temperature for the SN74AHCT245PWR?
The SN74AHCT245PWR is rated for operation from –40°C to +125°C ambient temperature, fully qualified across this extended industrial range per its datasheet specifications. This makes the SN74AHCT245PWR suitable for under-hood automotive applications and high-temperature industrial enclosures where thermal derating of standard commercial-grade logic is insufficient.
Can the SN74AHCT245PWR translate signals from 5 V to 3.3 V safely?
Yes - the SN74AHCT245PWR accepts 5 V-tolerant inputs (up to 5.5 V) while operating from a 5 V supply, and its outputs swing rail-to-rail (0 V to VCC). When interfacing with a 3.3 V receiver, the 5 V output may exceed absolute maximum ratings unless the downstream device is 5 V tolerant. For safe 5 V → 3.3 V translation, use external resistive dividers or ensure the 3.3 V device specifies 5 V-tolerant inputs. The SN74AHCT245PWR itself does not regulate or clamp output voltage.
Is the SN74AHCT245PWR pin-compatible with other 74xx245 variants in TSSOP-20?
Yes - the SN74AHCT245PWR shares identical pinout, footprint, and terminal functions with all SN74x245 variants offered in the PW (TSSOP-20) package, including SN74LVC245APWR and SN74LVCH245APWR. However, electrical characteristics such as supply voltage range, input thresholds, and output drive differ significantly; direct substitution requires validation of timing, voltage compatibility, and loading conditions in the target application.
What is the recommended bypass capacitor for the SN74AHCT245PWR VCC pin?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible (<3 mm) to the VCC pin (Pin 20) of the SN74AHCT245PWR, with low-inductance connection to the nearest ground plane. For systems with high-frequency noise or multiple logic devices, paralleling with a 1 µF tantalum or X7R ceramic capacitor further improves high-frequency decoupling. This ensures stable operation and minimizes supply-induced jitter or false switching.
Does the SN74AHCT245PWR require pull-up resistors on OE or DIR pins?
OE and DIR are standard CMOS inputs and must be actively driven to a valid logic level (VCC or GND) at all times - floating inputs are prohibited. While not strictly required, a 10 kΩ pull-up resistor on OE is strongly recommended to ensure automatic high-impedance state during power-up/power-down sequences. DIR may be tied directly to VCC or GND depending on fixed direction needs, or driven by a controller for dynamic reversal. The SN74AHCT245PWR specification mandates defined logic states for reliable operation.
SN74AHCT245PWR 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:
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT245PWR FAQ
1.How can I place an order for SN74AHCT245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT245PWR 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 SN74AHCT245PWR reliable?
The price and inventory of SN74AHCT245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT245PWR is usually 5 days.
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SN74AHCT245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT245PWR 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 SN74AHCT245PWR?
For technical support, including SN74AHCT245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT245PWR requirements.
6.How does Aetrix verify that SN74AHCT245PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT245PWR 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 SN74AHCT245PWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT245PWR?
All SN74AHCT245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT245PWR, 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 SN74AHCT245PWR part is unused and in its original packaging.
Return procedure for SN74AHCT245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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