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Texas Instruments SN74AC245NE4
- Part No.:
- SN74AC245NE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AC245NE4.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
SN74AC245NE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B ports. It operates from 2 V to 6 V, supports input voltages up to 6 V, delivers ≤7 ns propagation delay at 5 V, and features independent direction (DIR) and output-enable (OE) controls for flexible bus isolation in industrial control interfaces.
For engineers reviewing the SN74AC245NE4 datasheet, SN74AC245NE4 pinout, SN74AC245NE4 application, or SN74AC245NE4 equivalent, this device is selected for level-translating, noise-sensitive bus interfacing where controlled edge rates, wide supply tolerance, and high-impedance isolation during power sequencing are required.
Technical Context
The SN74AC245NE4 implements a CMOS-based dual-bus transceiver architecture with positive-logic DIR and OE inputs. Its functional modes-A-to-B, B-to-A, and high-Z isolation-are determined solely by DIR and OE logic states, eliminating external timing dependencies.
It uses balanced output drive with intentionally slower edge rates to suppress ringing on unterminated or lightly loaded PCB traces. Input voltage tolerance beyond VCC (up to 6 V) enables safe interfacing with mixed-voltage systems without external clamping diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports direct interface across 3.3 V and 5 V domains without level shifters |
| Max tpd @ 5 V | 7 ns - ensures sub-140 MHz data throughput in synchronous bus applications |
| Input Voltage Tolerance | Up to 6 V - allows safe connection to higher-voltage buses without damage or external protection |
| Output Drive | ±24 mA @ 4.5 V - sufficient for driving multiple TTL loads or moderate capacitive traces |
| ESD Rating (HBM) | ±3000 V - meets industrial IEC 61000-4-2 system-level robustness requirements |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial and industrial ambient environments |
| ICC (Quiescent) | 40 µA max @ 5.5 V - enables low-power standby in battery-backed or energy-conscious designs |
Pinout & Package
SN74AC245NE4 is packaged in a 20-pin plastic dual in-line package (PDIP-N), with 7.62 mm lead pitch, 24.33 mm × 9.4 mm body size, and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Determines data flow direction: DIR = L enables B→A; DIR = H enables A→B |
| 2–9 A1–A8 | Port A bidirectional I/O | Connects to source bus; functions as input or output depending on DIR state |
| 10 GND | Ground reference | Primary return path for all internal logic and output currents |
| 11–18 B8–B1 | Port B bidirectional I/O | Connects to destination bus; complements A-port under DIR control |
| 19 OE | Output enable input | Active-low: OE = L enables transceiver; OE = H forces all A/B pins to high-impedance state |
| 20 VCC | Power supply | Single supply rail supporting full 2–6 V operating range; requires local 0.1 µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Enables interoperability between 3.3 V microcontrollers and 5 V peripheral buses without translation logic |
| Input overvoltage tolerance (to 6 V) | Eliminates need for external clamping diodes when interfacing with legacy 5 V systems |
| Controlled edge rates | Reduces signal overshoot/undershoot on PCB traces, minimizing EMI and improving signal integrity |
| Independent DIR and OE logic | Allows dynamic direction switching while maintaining bus isolation during transitions |
| High-impedance state on power-up/down | Prevents bus contention during supply ramping when OE is tied to VCC via pullup resistor |
Applications
| Factory Automation Interface | Pro Audio Digital Bus |
|---|---|
Use Scenario: Isolating PLC I/O modules from backplane data buses during hot-swap or fault conditions. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling real-time sensor/actuator data exchange between 3.3 V controller and 5 V fieldbus peripherals. Use Value: High-impedance isolation prevents bus lockup; 2–6 V operation simplifies power domain bridging without discrete level shifters. |
Use Scenario: Interfacing digital audio processors (e.g., DSPs) with legacy 5 V AES/EBU or I²S peripheral ICs. IC Role / Device Role / Timing Role: Level-tolerant octal transceiver managing clock-aligned data transfer between mixed-voltage audio subsystems. Use Value: Input tolerance to 6 V avoids signal clipping; slow edge rates suppress jitter-inducing ringing on long audio board traces. |
| Video Signage Controller | Smart Appliance Communication Hub |
Use Scenario: Buffering parallel video timing signals (HSYNC/VSYNC/DATA) between FPGA video generator and LCD driver IC. IC Role / Device Role / Timing Role: Low-propagation-delay transceiver synchronizing pixel data across voltage-domain boundaries in display subsystems. Use Value: 7 ns max tpd preserves timing margins; 3-state control enables dynamic bus sharing among multiple video sources. |
Use Scenario: Connecting MCU-based appliance control boards to 5 V motor drivers, relay arrays, and sensor hubs. IC Role / Device Role / Timing Role: Robust bus interface IC providing galvanically isolated data paths and ESD-hardened I/O for home appliance mainboards. Use Value: ±3000 V HBM rating withstands handling in manufacturing; wide VCC range accommodates brown-out conditions during AC line fluctuations. |
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 | Lower VCC range (1.65–3.6 V); faster tpd (5.2 ns @ 3.3 V); no 6 V input tolerance | Optimized for 3.3 V-only systems; unsuitable for 5 V bus interfacing without external protection | Select when operating exclusively in 3.3 V domains and maximum speed is critical |
| 74ACT245 | Same 2–6 V VCC range; higher drive (±24 mA @ 5 V); identical pinout; slightly higher ICC (80 µA) | Compatible drop-in replacement with identical function and layout; preferred for higher-noise immunity | Choose for enhanced noise margin in electrically noisy factory environments |
Compared with SN74LVC245A and 74ACT245, the SN74AC245NE4 uniquely balances 5 V bus compatibility, 6 V input safety, and controlled edge rates-making it optimal for mixed-voltage industrial interfaces where signal integrity and robustness outweigh raw speed.
Availability
SN74AC245NE4 is available at Aetrix Electronics and suitable for factory automation interfaces, pro audio digital buses, and smart appliance communication hubs requiring stable component supply across extended production lifecycles.
Supply support for SN74AC245NE4 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 over 50 years of innovation in industrial and automotive electronics.
The SN74AC245NE4 belongs to TI's AC-series advanced CMOS logic family, engineered for robust, mixed-voltage bus interfacing in noise-sensitive industrial control and audio/video systems.
FAQ
What is the maximum propagation delay of SN74AC245NE4 at 5 V?
The maximum propagation delay (tpd) of SN74AC245NE4 is 7 ns at VCC = 5 V and TA = 25 °C, measured from input transition to valid output transition under specified load conditions. This value ensures reliable timing in 140 MHz bus applications and is guaranteed across the full operating temperature range (–40 °C to +85 °C) per TI's characterization data.
Can SN74AC245NE4 safely interface a 3.3 V microcontroller with a 5 V peripheral bus?
Yes, SN74AC245NE4 supports this use case directly: its 2–6 V VCC range allows operation at either 3.3 V or 5 V, and its inputs tolerate up to 6 V regardless of VCC. When powered at 3.3 V, it drives 5 V-tolerant peripherals; when powered at 5 V, it accepts 3.3 V logic levels. No external level-shifting components are required for basic interfacing.
How does the OE pin behave during power-up in SN74AC245NE4?
The OE pin of SN74AC245NE4 is active-low and defaults to undefined logic during power ramp-up. To ensure high-impedance isolation at power-on, TI recommends tying OE to VCC via a pullup resistor. The minimum resistance is determined by the driver's current-sinking capability; a 10 kΩ resistor is commonly used and guarantees OE remains high until firmware asserts control.
What is the thermal resistance (RθJA) of SN74AC245NE4 in its PDIP package?
For the SN74AC245NE4 in the 20-pin PDIP (N) package, the junction-to-ambient thermal resistance (RθJA) is 69 °C/W under standard JEDEC test conditions (1-layer board, 1 in² copper). This value assumes proper PCB layout with adequate copper pour and confirms suitability for ambient temperatures up to +85 °C without forced airflow or heatsinking.
Does SN74AC245NE4 support hot-swapping between live buses?
SN74AC245NE4 is not rated for hot-swap operation. While its 3-state outputs and high-impedance isolation mitigate contention risk, the device lacks built-in bus-fault protection, current limiting, or slew-rate control for live insertion. For hot-swap applications, TI recommends pairing SN74AC245NE4 with external series resistors or using purpose-built hot-swap controllers upstream.
SN74AC245NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AC245NE4 FAQ
1.How can I place an order for SN74AC245NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245NE4 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 SN74AC245NE4 reliable?
The price and inventory of SN74AC245NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245NE4 is usually 5 days.
3.What payment methods are accepted for SN74AC245NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC245NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC245NE4?
SN74AC245NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245NE4 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 SN74AC245NE4?
For technical support, including SN74AC245NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245NE4 requirements.
6.How does Aetrix verify that SN74AC245NE4 is sourced from the original manufacturer or authorized distributors?
All SN74AC245NE4 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 SN74AC245NE4 meets industry standards.
7.What is the process for return or replacement of SN74AC245NE4?
All SN74AC245NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245NE4, 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 SN74AC245NE4 part is unused and in its original packaging.
Return procedure for SN74AC245NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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