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Texas Instruments SN74AHC245PWR
- Part No.:
- SN74AHC245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC245PWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:17,446
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Product details
Overview
SN74AHC245PWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses. It operates from 2 V to 5.5 V, supports 5-V-to-3.3-V voltage translation, delivers ±8 mA output drive at 5 V, and features direction (DIR) and output-enable (OE) control pins for flexible bus isolation in PC and server memory interfaces.
For engineers reviewing the SN74AHC245PWR datasheet, SN74AHC245PWR pinout, SN74AHC245PWR application, or SN74AHC245PWR equivalent, key selection criteria include its TSSOP-20 package, 3.3 V/5 V dual-supply compatibility, 6.5 ns typical propagation delay at 5 V, 3-state output isolation timing, and I/O overvoltage tolerance up to 5.5 V independent of VCC.
Technical Context
The SN74AHC245PWR implements a CMOS-based octal transceiver architecture with separate DIR and OE control logic. Its bidirectional data paths (A1–A8 ↔ B1–B8) switch direction based on DIR level, while OE independently places all outputs in high-impedance state - enabling true bus isolation without contention.
It supports mixed-voltage system interfacing: inputs tolerate up to 5.5 V regardless of VCC (2–5.5 V), allowing safe down-translation from 5 V logic to 3.3 V microcontrollers. Slow edge rates minimize output ringing, and balanced drive ensures clean signal integrity under light capacitive loads (≤50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables operation across 3.3 V and 5 V systems, including mixed-voltage board designs |
| Output Drive | ±8 mA at 5 V - sufficient to drive standard TTL/CMOS loads without external buffers |
| tPLH / tPHL | 4 ns min / 6.5 ns max at 5 V, CL = 15 pF - ensures sub-7 ns per-channel latency in high-speed bus arbitration |
| Input Voltage Tolerance | Up to 5.5 V on all I/O pins - allows direct connection to 5 V buses while powered from 3.3 V |
| IOZ (Off-State Leakage) | ±2.5 µA max - maintains bus integrity during 3-state isolation with negligible leakage current |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 0.65 mm lead pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1 (MSL-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A data flow - determines real-time bus directionality |
| OE (Pin 19) | Output enable input | Low = active transceiver; High = all A/B outputs enter high-impedance - enables dynamic bus isolation |
| A1–A8 (Pins 2–9) | Port A I/O terminals | Bidirectional data lines tied to one bus segment; internally connected to transceiver core |
| B1–B8 (Pins 11–18) | Port B I/O terminals | Bidirectional data lines tied to second bus segment; electrically isolated from Port A when OE = high |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and internal logic - must be low-impedance for noise immunity |
| VCC (Pin 20) | Power supply | Single-supply rail powering all logic and output stages - requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation support | Enables 5 V → 3.3 V interface without level shifters - inputs accept 5.5 V while VCC = 3.3 V |
| Controlled edge rates | Slower rise/fall times reduce EMI and output ringing on PCB traces and connectors |
| Bus contention prevention | Independent DIR and OE logic prevents simultaneous A→B and B→A drive - eliminates shoot-through risk |
| Power-up/down high-Z safety | OE tied to VCC via pullup ensures outputs remain high-impedance during power sequencing |
| Low static current | ICC ≤ 40 µA max - minimizes quiescent power in always-on system management functions |
Applications
| Server Memory Interconnect | Industrial PLC Backplane |
|---|---|
Use Scenario: Bidirectional data exchange between CPU memory controller and DDR SDRAM modules in 1U rack servers. IC Role / Device Role / Timing Role: Octal transceiver managing address/control bus handshaking and direction switching during read/write cycles. Use Value: 6.5 ns propagation delay and 5.5 V-tolerant inputs allow direct integration with legacy 5 V register banks while operating at 3.3 V core logic. | Use Scenario: Isolating field I/O modules from central processor backplane in modular automation controllers. IC Role / Device Role / Timing Role: Bus buffer providing hot-swap-safe isolation between distributed I/O cards and main controller bus. Use Value: OE-controlled 3-state operation prevents bus contention during card insertion/removal; –40 °C to +125 °C rating supports harsh cabinet environments. |
| PC Chipset Interface | Wearable Health Hub |
Use Scenario: Level-shifting and buffering between 5 V legacy peripherals (e.g., Super I/O) and 3.3 V southbridge in desktop motherboards. IC Role / Device Role / Timing Role: Voltage-translating bus transceiver synchronizing LPC or SMbus signals across voltage domains. Use Value: Input overvoltage tolerance eliminates need for discrete clamping diodes; TSSOP-20 footprint saves space versus SOIC-20 alternatives. | Use Scenario: Interfacing a 3.3 V ARM Cortex-M4 sensor hub with 5 V display driver and battery fuel gauge ICs in compact wearable devices. IC Role / Device Role / Timing Role: Compact bidirectional bridge enabling shared data bus between heterogeneous voltage-domain subsystems. Use Value: 6.5 mm × 6.4 mm TSSOP package fits tight layout constraints; low ICC supports multi-day battery life in always-on monitoring mode. |
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 - no 5 V tolerance on I/O | Restricted to 3.3 V-only systems; cannot replace SN74AHC245PWR in mixed-voltage designs | Select when full 3.3 V compatibility and lower power are prioritized over 5 V interface capability |
| 74ALVC245PW,118 | Same 1.65–3.6 V range; higher speed (tPD = 2.5 ns @ 3.3 V) but no 5.5 V input tolerance | Suitable for high-speed 3.3 V FPGA-to-FPGA interconnects, not for 5 V legacy peripheral bridging | Choose for maximum throughput in pure 3.3 V domains where SN74AHC245PWR's voltage flexibility is unnecessary |
Compared with SN74LVC245APWR and 74ALVC245PW,118, the SN74AHC245PWR uniquely supports 5 V-tolerant I/O at 3.3 V VCC - making it irreplaceable in legacy peripheral bridging, whereas the alternatives are optimized strictly for modern low-voltage, high-speed point-to-point links.
Availability
SN74AHC245PWR is available at Aetrix Electronics and suitable for server memory interconnects, industrial PLC backplanes, and PC chipset interfaces requiring stable component supply across long production lifecycles.
Supply support for SN74AHC245PWR 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SNx4AHC245 product line targets robust, voltage-flexible bus interfacing in computing and industrial control systems - emphasizing reliability, mixed-voltage interoperability, and ease of integration into legacy and next-generation platforms.
FAQ
What is the maximum input voltage the SN74AHC245PWR can tolerate on its I/O pins?
The SN74AHC245PWR accepts input voltages up to 5.5 V on all A/B port pins and control inputs (DIR, OE), regardless of VCC value (2–5.5 V). This overvoltage tolerance enables safe 5 V-to-3.3 V down-translation without external protection circuitry - a key feature confirmed in Section 5.3 of the TI datasheet SCLS230N.
Does the SN74AHC245PWR support bidirectional data flow on each individual pin pair?
Yes, the SN74AHC245PWR provides true per-channel bidirectional operation: each of the eight A/B pairs (A1↔B1 through A8↔B8) transfers data in either direction depending on the DIR pin state. When DIR = high, data flows A→B; when DIR = low, data flows B→A - all under independent OE control.
What is the recommended power supply decoupling for the SN74AHC245PWR?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) of the SN74AHC245PWR. For optimal noise suppression across frequency bands, pairing this with a 1 µF bulk capacitor nearby is acceptable - both must connect directly to low-inductance ground planes per Section 8.3 of the official datasheet.
Can the SN74AHC245PWR be used in hot-swap applications?
Yes, the SN74AHC245PWR supports hot-swap operation when OE is held high (disabled) during insertion. Its 3-state outputs ensure no bus contention, and the device's specified operating temperature range (–40 °C to +125 °C) and robust ESD ratings (1500 V HBM) meet industrial hot-plug requirements - validated in TI Application Report SCBA004.
What is the thermal resistance (RθJA) of the SN74AHC245PWR in its TSSOP-20 package?
The junction-to-ambient thermal resistance (RθJA) for the SN74AHC245PWR in the PW (TSSOP-20) package is 122.3 °C/W, as specified in Table 5.4 of the TI datasheet SCLS230N. This value assumes standard JEDEC test conditions (1s2p board) and informs thermal design for continuous operation at rated load.
SN74AHC245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC245PWR FAQ
1.How can I place an order for SN74AHC245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC245PWR 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 SN74AHC245PWR reliable?
The price and inventory of SN74AHC245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC245PWR is usually 5 days.
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SN74AHC245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC245PWR 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 SN74AHC245PWR?
For technical support, including SN74AHC245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC245PWR requirements.
6.How does Aetrix verify that SN74AHC245PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC245PWR 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 SN74AHC245PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC245PWR?
All SN74AHC245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC245PWR, 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 SN74AHC245PWR part is unused and in its original packaging.
Return procedure for SN74AHC245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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