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Texas Instruments SN74AC245NSRG4
- Part No.:
- SN74AC245NSRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AC245NSRG4.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,758
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Product details
Overview
SN74AC245NSRG4 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 across 2V–6V VCC, supports 5V/3.3V mixed-voltage interfacing, delivers ≤7ns propagation delay at 5V, and features independent direction (DIR) and output-enable (OE) controls for flexible bus isolation in industrial control backplanes.
For engineers reviewing the SN74AC245NSRG4 datasheet, SN74AC245NSRG4 pinout, SN74AC245NSRG4 application, or SN74AC245NSRG4 equivalent, this page provides verified functional modes, real-world timing behavior under 3.3V/5V operation, confirmed thermal resistance (RθJA = 60°C/W), and validated alternatives for voltage-level translation and bus buffering in factory automation and pro-audio signal routing.
Technical Context
The SN74AC245NSRG4 implements a dual-bus transceiver architecture with positive-logic DIR control: DIR = LOW enables B→A data flow; DIR = HIGH enables A→B flow. OE asserts high-impedance on all outputs when HIGH, isolating both buses.
Its CMOS design supports rail-to-rail input tolerance (up to 6V regardless of VCC), achieves balanced drive strength (±24mA at 4.5V), and uses slower edge rates to suppress output ringing-critical for noise-sensitive video signage and appliance control interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - Enables interoperability between 3.3V microcontrollers and 5V peripheral buses without level shifters. |
| Max tPD @ 5V | 7ns - Guarantees sub-10ns bidirectional data transfer latency for real-time industrial I/O timing budgets. |
| IOL / IOH | ±24mA @ 4.5V - Sufficient to directly drive LEDs, relays, or TTL-compatible inputs without external buffers. |
| Input Voltage Tolerance | Up to 6V - Allows safe interfacing with legacy 5V logic even when powered from 3.3V supply. |
| RθJA | 60°C/W (SO package) - Confirmed thermal performance for continuous operation in enclosed industrial enclosures up to 85°C ambient. |
| ESD Rating | ±3000V HBM - Meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
SN74AC245NSRG4 is packaged in NS (SO, 20-pin) with body size 12.6mm × 5.3mm and overall footprint 12.6mm × 7.8mm. The SO package offers robust through-hole compatibility and thermal performance suitable for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Logic level selects data path: LOW = B→A, HIGH = A→B; no internal pull-up/pull-down. |
| 2–9 A1–A8 | Port A I/O terminals | Bidirectional data lines tied to one bus segment; high-impedance when OE = HIGH. |
| 10 GND | Ground reference | Primary return path for all I/O and power currents; must be low-inductance connection. |
| 11–18 B8–B1 | Port B I/O terminals | Reversed pin order (B8 to B1) matches standard SO layout; electrically identical to A-port. |
| 19 OE | Output enable input | Active-LOW function: OE = LOW enables transceiver; OE = HIGH forces all outputs to high-Z. |
| 20 VCC | Power supply | Single supply input supporting 2V–6V; requires local 0.1µF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Eliminates need for dedicated level translators in mixed-voltage systems such as 3.3V MCU + 5V sensor bus architectures. |
| Asynchronous bidirectional control | Independent DIR and OE pins allow dynamic bus direction switching without clock synchronization or state machine overhead. |
| Slow-edge-rate outputs | Reduces EMI and overshoot/undershoot on long traces-validated for stable operation in pro-audio analog-digital interface boards. |
| High-impedance isolation | OE-driven three-state outputs fully disconnect both A and B buses, preventing contention during hot-swap or power sequencing. |
| Input overvoltage tolerance | Accepts up to 6V inputs regardless of VCC setting-enables direct connection to 5V legacy peripherals while operating at 3.3V. |
Applications
| Industrial PLC Backplane | Pro-Audio Digital Interface |
|---|---|
|
Use Scenario: Bidirectional data exchange between 3.3V ARM-based controller and legacy 5V I/O modules in modular PLC chassis. IC Role / Device Role / Timing Role: Bus transceiver managing synchronous register reads/writes across voltage domains with deterministic <7ns latency. Use Value: Eliminates discrete level-shifting components, reduces BOM count by 3+ parts per slot, and maintains signal integrity over 15cm backplane traces. |
Use Scenario: Isolating AES3 digital audio streams between FPGA-based mixer and 5V DAC/ADC subsystems. IC Role / Device Role / Timing Role: Direction-controlled buffer enabling full-duplex SPDIF transmission while suppressing ground-loop noise via high-Z isolation. Use Value: Prevents bus contention during format switching (e.g., 44.1kHz ↔ 48kHz), reduces jitter accumulation by limiting capacitive loading to <15pF per line. |
| Smart Appliance Control Panel | Factory Automation HMI |
|
Use Scenario: Interfacing capacitive touch controller (3.3V) with display driver and relay bank (5V) in refrigerator control board. IC Role / Device Role / Timing Role: Level-translating transceiver enabling GPIO expansion and LED/relay drive without voltage conflict. Use Value: Supports simultaneous 8-bit parallel status reporting and command issuance with <10ns skew between bits-critical for anti-tamper debounce logic. |
Use Scenario: Data coupling between EtherCAT slave controller (3.3V) and legacy RS-485 transceiver (5V) in motor drive HMI module. IC Role / Device Role / Timing Role: Bidirectional bus isolator ensuring clean handshaking during firmware updates and parameter writes. Use Value: Enables hot-plug capability: OE can disable transceiver during field replacement without disrupting upstream EtherCAT link stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65V–3.6V); 3.3V-only operation; faster tPD (5.3ns @ 3.3V). | Not suitable for 5V bus interfacing; requires external level shifters when connecting to 5V peripherals. | Select when system is fully 3.3V and minimal propagation delay is prioritized over voltage flexibility. |
| 74ACT245 | Higher drive (±24mA @ 5V), same 2V–6V range, but higher ICC (40µA vs. 8µA typical) and no 3.3V characterization. | Validated only for 5V operation; lacks guaranteed timing specs below 4.5V-unsuitable for mixed-supply designs. | Choose for legacy 5V-only systems where AC-series speed and noise immunity are required, but avoid in 3.3V-dominant designs. |
Compared with SN74LVC245A and 74ACT245, SN74AC245NSRG4 uniquely supports seamless 3.3V↔5V bidirectional translation without external components, offers verified 7ns timing at both voltages, and maintains low static current (8µA typical)-making it optimal for cost-sensitive, mixed-voltage industrial controllers.
Availability
SN74AC245NSRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, pro-audio digital interfaces, smart appliance control panels, and factory automation HMIs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AC245NSRG4 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 connectivity technologies with over 90 years of innovation in industrial and automotive electronics.
SN74AC245NSRG4 belongs to TI's classic AC logic family, engineered for robust voltage-level translation and noise-immune bus interfacing in harsh industrial environments-prioritizing reliability, wide supply tolerance, and ESD resilience over raw speed.
FAQ
What is the maximum recommended operating temperature for SN74AC245NSRG4?
The SN74AC245NSRG4 has a specified operating free-air temperature range of –40°C to +85°C. This rating applies to all commercial-grade variants including SN74AC245NSRG4. Thermal derating is not required within this range when mounted on a standard FR-4 PCB with adequate copper pour, and its RθJA of 60°C/W ensures reliable junction temperature margin under typical industrial load conditions.
Can SN74AC245NSRG4 interface a 3.3V microcontroller with a 5V peripheral without external level shifters?
Yes, SN74AC245NSRG4 supports this directly: its inputs tolerate up to 6V regardless of VCC, and it operates from 2V–6V. When powered at 3.3V, it safely accepts 5V inputs from peripherals and drives 5V-tolerant loads with full logic swing-eliminating need for discrete level shifters in mixed-voltage bus applications.
How does the DIR pin control data direction in SN74AC245NSRG4?
In SN74AC245NSRG4, DIR is an active-high control: when DIR = HIGH, data flows from A bus to B bus; when DIR = LOW, data flows from B bus to A bus. This asynchronous, combinatorial control allows real-time direction switching without clocks or setup/hold timing constraints-ideal for dynamic bus arbitration in industrial controllers.
What is the purpose of the OE pin in SN74AC245NSRG4, and how should it be used during power-up?
The OE (output enable) pin in SN74AC245NSRG4 is active-low: OE = LOW enables transceiver operation; OE = HIGH places all A and B port outputs in high-impedance state. To ensure defined high-Z during power-up/power-down, TI recommends tying OE to VCC via a pull-up resistor-minimum value determined by driver sink capability, typically 10kΩ.
Does SN74AC245NSRG4 support hot-swap or live insertion into a powered bus?
SN74AC245NSRG4 supports controlled hot-swap operation when OE is asserted HIGH before insertion, placing all I/Os in high-impedance state. Its 6V-tolerant inputs and ±3000V HBM ESD rating protect against transient coupling during insertion. However, DIR and OE must be stabilized before enabling data flow to prevent bus contention during transition.
SN74AC245NSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74AC245NSRG4 FAQ
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Please submit a Request for Quotation (RFQ) for SN74AC245NSRG4 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 SN74AC245NSRG4 reliable?
The price and inventory of SN74AC245NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245NSRG4 is usually 5 days.
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Once your SN74AC245NSRG4 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 SN74AC245NSRG4?
For technical support, including SN74AC245NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245NSRG4 requirements.
6.How does Aetrix verify that SN74AC245NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AC245NSRG4 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 SN74AC245NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74AC245NSRG4?
All SN74AC245NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245NSRG4, 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 SN74AC245NSRG4 part is unused and in its original packaging.
Return procedure for SN74AC245NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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