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Texas Instruments SN74HC245DWRE4
- Part No.:
- SN74HC245DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC245DWRE4.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,457
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Product details
Overview
SN74HC245DWRE4 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 or mixed-voltage digital systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns (VCC = 6 V, CL = 50 pF), and supports isolation via independent DIR and OE controls - used in PC motherboard I/O buffering and server backplane interface circuits.
For engineers reviewing the SN74HC245DWRE4 datasheet, SN74HC245DWRE4 pinout, SN74HC245DWRE4 application, or SN74HC245DWRE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3-state bidirectional bus control logic, wide supply range compatibility, and verified performance under 50-pF load conditions per TI SCLS131F.
Technical Context
The SN74HC245DWRE4 implements dual-control asynchronous bus transceivers using silicon-gate CMOS technology. Its DIR input selects data flow direction (A→B or B→A), while OE independently enables or disables all eight outputs into high-impedance state - enabling bus sharing without contention.
It features balanced output drive, low input current (≤1 µA), and slow edge rates to minimize ringing on PCB traces. Functional modes are strictly defined by OE/DIR logic combinations: OE = L enables bidirectional transfer (DIR determines direction); OE = H forces full isolation regardless of DIR state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports interoperability across 3.3-V and 5-V logic domains without level shifters. |
| Output Drive Capability | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or terminate short PCB traces. |
| Propagation Delay | 12 ns typical (VCC = 6 V, CL = 50 pF) - enables reliable operation in sub-50-MHz synchronous bus environments. |
| Quiescent Supply Current | 80 µA max - ensures minimal standby power impact in always-on embedded control subsystems. |
| Input Leakage Current | 1 µA max - prevents unintended logic transitions when inputs are pulled via high-value resistors. |
| ESD Rating | ±3000 V HBM - meets industrial handling requirements without additional protection circuitry. |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial and industrial-grade system integration. |
Pinout & Package
SN74HC245DWRE4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 1.27-mm pitch and gull-wing leads compatible with automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: L = B→A, H = A→B - defines real-time data path polarity during active transfer. |
| 2–9 | A1–A8 | Bus A port I/O pins - connect to microcontroller/data processor side; tolerate 0–VCC voltage swing. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling into transceiver core. |
| 11–18 | B1–B8 | Bus B port I/O pins - interface to peripheral/memory bus; electrically identical to A-side pins. |
| 19 | OE | Output enable input: L = enabled, H = high-Z - provides hardware-level bus arbitration and hot-swap isolation. |
| 20 | VCC | Power supply pin - requires local 0.1-µF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Enables direct interfacing between 3.3-V controllers and 5-V peripherals without external level translation. |
| Independent DIR and OE controls | Allows simultaneous bus direction setting and dynamic output gating - critical for multi-master arbitration schemes. |
| Low-power CMOS design | 80-µA max ICC enables use in battery-backed or thermally constrained applications like point-of-sale terminals. |
| Controlled edge rates | Reduces signal overshoot/undershoot on stubbed or unterminated traces - improves signal integrity in compact layouts. |
| High-current 3-state outputs | ±6-mA drive capability supports robust fanout to multiple LSTTL inputs while maintaining VOL ≤ 0.33 V at 6 mA. |
Applications
| PC Motherboard I/O Buffering | Server Backplane Interface |
|---|---|
|
Use Scenario: Isolating legacy parallel port or LPC bus signals between chipset and add-in cards in x86 platforms. IC Role / Device Role / Timing Role: Bidirectional data buffer with direction-selectable flow and hardware-controlled tri-state enable for bus sharing. Use Value: Eliminates need for discrete direction logic and pull-up networks; reduces BOM count and layout area versus discrete gate solutions. |
Use Scenario: Interfacing baseboard management controller (BMC) to hot-swap I²C/SMBus sensors across redundant server blades. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation transceiver enabling safe insertion/removal without disrupting shared control bus. Use Value: OE-driven high-Z state prevents bus contention during blade insertion; 2–6 V range accommodates both 3.3-V BMC and 5-V sensor rails. |
| Industrial PLC Communication Module | Wearable Health Data Hub |
|
Use Scenario: Bridging RS-485 transceiver data lines to microcontroller UART in programmable logic controller modules. IC Role / Device Role / Timing Role: Signal-direction arbitrator that routes TX/RX data based on half-duplex protocol state. Use Value: DIR pin synchronized to DE control simplifies firmware timing; ±6 mA drive ensures clean edges over 10-cm PCB traces. |
Use Scenario: Multiplexing sensor data streams (ECG, SpO₂, accelerometer) onto a single SPI bus routed to low-power MCU in fitness tracker. IC Role / Device Role / Timing Role: Low-power bidirectional data concentrator enabling time-division multiplexing of sensor readouts. Use Value: 80-µA max ICC extends battery life; 3-state outputs prevent cross-talk when individual sensors are idle or powered down. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245DWRE4 | CMOS input thresholds referenced to TTL levels (VIH = 2 V min), higher ICC (160 µA max). | Better compatibility with legacy 5-V TTL outputs; less suitable for mixed 3.3/5-V systems requiring strict CMOS thresholds. | Select when interfacing with older 74LS/74ALS logic families where input threshold margin is critical. |
| 74LVC245APW,118 | Lower VCC range (1.65–3.6 V), 32 mA drive, 3.3-V only; TSSOP-20 package (6.5 × 4.4 mm). | Optimized for modern low-voltage portable designs; incompatible with 5-V buses without level shifting. | Prefer for new 3.3-V-only designs where space and power efficiency outweigh 5-V compatibility needs. |
Compared with SN74HC245DWRE4, SN74HCT245DWRE4 offers improved TTL-input compatibility at the cost of higher static current, while 74LVC245APW,118 delivers superior drive and density in 3.3-V systems but lacks 5-V tolerance - making SN74HC245DWRE4 the optimal choice for mixed-voltage or legacy-compatible bus isolation.
Availability
SN74HC245DWRE4 is available at Aetrix Electronics and suitable for PC motherboards, server backplanes, and industrial PLC communication modules requiring stable component supply across extended production lifecycles.
Supply support for SN74HC245DWRE4 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 logic, power, and signal chain technologies.
SN74HC245DWRE4 belongs to the 74HC logic family - engineered for high noise immunity, low power consumption, and seamless interoperability across voltage domains in computing, communications, and industrial control systems.
FAQ
What is the maximum operating temperature for SN74HC245DWRE4?
The SN74HC245DWRE4 is rated for operation from –40 °C to +85 °C ambient temperature, as specified in TI's SCLS131F datasheet Section 6.3. This range qualifies it for commercial and industrial environments, including server chassis and factory-floor PLC modules where thermal management may be constrained. The SOIC (DW) package's thermal resistance (RθJA = 77.0 °C/W) supports reliable operation within this envelope under typical PCB copper pour conditions.
Does SN74HC245DWRE4 support 3.3-V logic levels?
Yes, SN74HC245DWRE4 fully supports 3.3-V logic operation: its recommended VCC range is 2 V to 6 V, and input thresholds scale with supply voltage (e.g., VIH = 2.0 V min at VCC = 3.3 V). At 3.3 V, it delivers ±4 mA output drive and maintains tpd ≤ 18 ns (CL = 50 pF), making it suitable for interfacing between 3.3-V microcontrollers and 5-V peripherals without external level shifters.
How does the OE pin function on SN74HC245DWRE4?
The OE (output enable) pin on SN74HC245DWRE4 is an active-low control that places all eight A- and B-side outputs into high-impedance state when driven high. When OE = L, outputs are enabled and respond to DIR state; when OE = H, both buses are electrically isolated regardless of DIR or data values. TI recommends tying OE to VCC via a pullup resistor during power-up to ensure default isolation and prevent bus contention.
What is the pin pitch and footprint compatibility of SN74HC245DWRE4?
SN74HC245DWRE4 uses a standard 20-pin SOIC (DW) package with 1.27-mm lead pitch and 12.80 mm × 7.50 mm body size. Its footprint matches JEDEC MS-013AC, ensuring drop-in compatibility with other SOIC-20 logic devices. Pad dimensions and solder mask clearance follow IPC-7351B nominal standards, supporting both reflow and wave soldering processes without modification.
Can SN74HC245DWRE4 drive LSTTL loads directly?
Yes, SN74HC245DWRE4 is explicitly rated to drive up to 15 LSTTL loads directly, as stated in its Features section. At VCC = 5 V, its ±6-mA output drive meets LSTTL input current requirements (IIL ≤ 0.4 mA, IIH ≤ 20 µA), and VOL ≤ 0.33 V at 6 mA ensures valid low-level recognition. No series termination or external buffers are needed for standard LSTTL fanout scenarios.
SN74HC245DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC245DWRE4 FAQ
1.How can I place an order for SN74HC245DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC245DWRE4 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 SN74HC245DWRE4 reliable?
The price and inventory of SN74HC245DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC245DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC245DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC245DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC245DWRE4?
SN74HC245DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC245DWRE4 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 SN74HC245DWRE4?
For technical support, including SN74HC245DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC245DWRE4 requirements.
6.How does Aetrix verify that SN74HC245DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC245DWRE4 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 SN74HC245DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC245DWRE4?
All SN74HC245DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC245DWRE4, 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 SN74HC245DWRE4 part is unused and in its original packaging.
Return procedure for SN74HC245DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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