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Texas Instruments SN74AC245N
- Part No.:
- SN74AC245N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AC245N.pdf
- Description:
- IC TXRX NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:695
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Product details
Overview
SN74AC245N from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and consumer systems. It operates from 2 V to 6 V, supports 5-V/3.3-V mixed-voltage interfacing, delivers ≤7 ns propagation delay at 5 V, and features independent direction (DIR) and output-enable (OE) controls for flexible bus isolation - used in factory automation I/O modules and pro-audio digital signal routing.
For engineers reviewing the SN74AC245N datasheet, SN74AC245N pinout, SN74AC245N application, or SN74AC245N equivalent, key selection criteria include its wide VCC range (2–6 V), 3-state bus isolation capability, 20-pin PDIP package compatibility with legacy through-hole designs, and verified 8-bit bidirectional data flow control without external timing circuitry.
Technical Context
The SN74AC245N implements a CMOS-based octal transceiver architecture with dual independent control inputs: DIR selects data direction (A→B or B→A), while OE places all outputs in high-impedance state. Its logic-level agnostic inputs accept voltages up to 6 V regardless of VCC, enabling robust level translation across 3.3 V and 5 V domains.
Propagation delay is tightly specified at ≤7 ns (max) at VCC = 5 V, with guaranteed switching performance down to 2 V supply. The device uses balanced output drive and intentionally slower edge rates to suppress output ringing - critical in noise-sensitive video signage and audio interface applications where signal integrity must be maintained over PCB traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables direct interfacing between 3.3 V microcontrollers and 5 V peripheral buses without external level shifters. |
| Max tpd @ 5 V | 7 ns - ensures sub-14.3 MHz sustained data throughput with timing margin for synchronous handshaking. |
| Input Voltage Tolerance | Up to 6 V - allows safe connection to higher-voltage control signals even when VCC = 3.3 V. |
| Output Drive | ±24 mA @ 4.5 V - sufficient to drive standard TTL loads and moderate-capacitance PCB traces (≤30 pF). |
| Operating Temp | –40 °C to +85 °C - qualified for industrial embedded environments including factory automation controllers. |
| ESD Rating | HBM ±3000 V - meets IEC 61000-4-2 Level 3 for handling robustness in manufacturing and field service. |
Pinout & Package
SN74AC245N is packaged in a 20-pin plastic dual in-line package (PDIP-N), with 24.33 mm × 9.4 mm body size and through-hole mounting compatible with legacy prototyping and industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Logic level determines data flow direction: HIGH = A→B, LOW = B→A; no internal pullup/pulldown. |
| 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 internal logic and output current; requires low-inductance connection. |
| 11–18 (B8–B1) | Port B I/O terminals | Reversed pin order (B8 to B1) matches standard SSOP/SOIC layouts; electrically identical to A-port. |
| 19 (OE) | Output enable input | Active-LOW control: OE = LOW enables transceiver; OE = HIGH forces all A/B pins into 3-state mode. |
| 20 (VCC) | Power supply | Single-supply rail supporting full 2–6 V range; requires local 0.1 µF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2 V to 6 V operation enables interoperability across 3.3 V and 5 V system domains without level-shifting circuitry. |
| Input overvoltage tolerance | Inputs accept up to 6 V regardless of VCC - prevents damage during hot-swap or mixed-rail power sequencing. |
| Controlled edge rate | Slower output transitions minimize overshoot/undershoot on unterminated traces, reducing EMI in audio/video signal paths. |
| High-impedance isolation | OE-controlled 3-state outputs fully disconnect both A and B buses, preventing contention during power-up/down or fault conditions. |
| Industrial temperature grade | Rated for –40 °C to +85 °C ambient - validated for continuous operation in programmable logic controllers and motor drive I/O modules. |
Applications
| Pro Audio Digital Interface | Factory Automation I/O Module |
|---|---|
Use Scenario: Routing digital audio streams between DSPs, ADCs, and DACs in multi-channel mixing consoles. IC Role / Device Role / Timing Role: Bidirectional data bridge between 3.3 V audio processor and 5 V legacy codec peripherals. Use Value: Eliminates need for discrete level shifters while maintaining <7 ns timing skew across all 8 data lanes. | Use Scenario: Isolating PLC backplane communication from field-side sensor/actuator buses in modular I/O racks. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver enabling master-slave handshaking over extended PCB traces. Use Value: OE-driven 3-state isolation prevents bus contention during hot-swap of I/O modules without software intervention. |
| Video Signage Controller | Home Appliance Control Board |
Use Scenario: Interfacing HDMI transmitter logic (3.3 V) with legacy LVDS display drivers (5 V) in digital signage media players. IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver managing parallel pixel/data bus handoff with direction arbitration. Use Value: Input overvoltage rating protects against 5 V driver leakage currents when VCC = 3.3 V, improving long-term reliability. | Use Scenario: Connecting MCU GPIO banks to high-current relay and LED driver arrays in smart refrigerator control boards. IC Role / Device Role / Timing Role: Buffering and isolating low-power MCU outputs from noisy 5 V power-switching circuits. Use Value: Controlled edge rates reduce conducted EMI from relay coil switching, easing EMC compliance testing. |
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 (≤5.3 ns @ 3.3 V); 3.6 V max input tolerance. | Optimized for 3.3 V-only systems; not suitable for 5 V bus interfacing or mixed-voltage translation. | Select when operating exclusively at 3.3 V and requiring tighter timing margins. |
| 74ACT245 | Same 4.5–5.5 V VCC range; higher drive (±24 mA @ 5 V); identical pinout but different AC characteristics. | Requires strict 5 V supply; lacks 2–6 V flexibility and 6 V input tolerance of SN74AC245N. | Choose for legacy 5 V-only designs where TI AC-series availability is constrained. |
Compared with SN74LVC245A and 74ACT245, the SN74AC245N uniquely supports 2–6 V operation with 6 V input tolerance - making it the only option among the three for reliable 3.3 V ↔ 5 V bidirectional translation without external components.
Availability
SN74AC245N is available at Aetrix Electronics and suitable for factory automation I/O modules, pro-audio digital interfaces, and home appliance control boards requiring stable component supply across extended product lifecycles.
Supply support for SN74AC245N 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 for industrial, automotive, and consumer markets.
The SN74AC245N belongs to TI's AC-family of advanced CMOS logic devices, engineered for robust mixed-voltage bus interfacing in industrial control and audio/video equipment where reliability and wide supply range are critical.
FAQ
What is the maximum supply voltage for SN74AC245N?
The SN74AC245N supports a maximum supply voltage of 6 V. Absolute maximum ratings specify VCC up to 7 V, but recommended operation is limited to 2 V–6 V per TI's datasheet Section 5.3. Operating beyond 6 V risks exceeding electrical specifications and may compromise long-term reliability - always maintain VCC within this range for compliant SN74AC245N functionality.
Does SN74AC245N support 3.3 V to 5 V level translation?
Yes, the SN74AC245N supports bidirectional level translation between 3.3 V and 5 V buses. Its inputs tolerate up to 6 V regardless of VCC, and outputs swing rail-to-rail. When VCC = 3.3 V, it safely accepts 5 V inputs; when VCC = 5 V, it drives 5 V logic levels - making SN74AC245N ideal for mixed-voltage interconnects without external translators.
What is the function of the DIR and OE pins on SN74AC245N?
The DIR (pin 1) controls data direction: logic HIGH enables A→B transfer, LOW enables B→A. The OE (pin 19) is active-LOW output enable: when LOW, transceiver operates normally; when HIGH, all A and B pins enter high-impedance 3-state mode. Both controls operate independently - SN74AC245N requires no external timing, and OE assertion fully isolates both buses.
Is SN74AC245N RoHS compliant?
Yes, SN74AC245N is RoHS compliant, as confirmed in TI's Package Option Addendum (status "NRND", lead finish NIPDAU). It meets EU Directive 2011/65/EU requirements with lead-free terminations and compliant packaging materials - verified for use in commercial and industrial products sold in regulated markets.
What is the thermal resistance (RθJA) of SN74AC245N in its PDIP package?
The SN74AC245N in PDIP (N) package has a junction-to-ambient thermal resistance (RθJA) of 69 °C/W, per TI's datasheet Section 5.4. This value assumes standard JEDEC 2-layer board conditions. For sustained operation near maximum ratings, ensure adequate airflow or heatsinking - especially when driving multiple outputs at ≥20 mA each under 85 °C ambient conditions.
SN74AC245N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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
SN74AC245N FAQ
1.How can I place an order for SN74AC245N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245N 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 SN74AC245N reliable?
The price and inventory of SN74AC245N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245N is usually 5 days.
3.What payment methods are accepted for SN74AC245N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC245N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC245N?
SN74AC245N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245N 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 SN74AC245N?
For technical support, including SN74AC245N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245N requirements.
6.How does Aetrix verify that SN74AC245N is sourced from the original manufacturer or authorized distributors?
All SN74AC245N 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 SN74AC245N meets industry standards.
7.What is the process for return or replacement of SN74AC245N?
All SN74AC245N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245N, 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 SN74AC245N part is unused and in its original packaging.
Return procedure for SN74AC245N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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