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Texas Instruments SN74AC245PWRQ1
- Part No.:
- SN74AC245PWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AC245PWRQ1.pdf
- Description:
- AUTOMOTIVE OCTAL BUS TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:1,865
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Product details
Overview
SN74AC245PWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal bus transceiver with 3-state outputs, operating from 1.5V to 6V supply, supporting bidirectional data flow between two 8-bit buses under DIR/OE control, and delivering ±24mA continuous output drive at 5V for robust signal integrity in vehicle networking and body control modules.
For engineers reviewing the SN74AC245PWRQ1 datasheet, SN74AC245PWRQ1 pinout, SN74AC245PWRQ1 application, or SN74AC245PWRQ1 equivalent, this page delivers verified electrical specs, validated TSSOP-20 pin mapping, automotive thermal and ESD performance data, and real-world functional mode behavior - all confirmed against TI's SCLS971B production datasheet (March 2024 revision).
Technical Context
The SN74AC245PWRQ1 implements dual-directional CMOS transceiver logic per channel, with shared DIR (pin 1) and OE (pin 19) controlling all eight A↔B paths simultaneously. Its balanced 3-state outputs support bidirectional bus isolation and level translation across 1.5V–6V rails without external biasing.
Each channel features independent high-impedance control: when OE = HIGH, all outputs enter high-Z regardless of DIR; when OE = LOW, DIR selects direction (L = B→A, H = A→B), with unused inputs requiring termination to VCC or GND per TI's CMOS input guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 6V - enables interoperability across 1.8V, 2.5V, 3.3V, and 5V logic domains without level shifters |
| Continuous Output Drive | ±24mA at 5V - sustains stable signal integrity into 50Ω transmission lines or moderate capacitive loads |
| Propagation Delay (tpd) | 3.5ns (min) to 6.5ns (typ) at 5V - supports >100MHz data rates in short-bus configurations |
| ESD Rating (HBM) | ±2000V - meets AEC-Q100-002 Level 2 for automotive board-level reliability |
| Operating Temperature | −40°C to +125°C - qualified for engine bay, ADAS sensor hubs, and powertrain control units |
| Input Voltage Tolerance | Up to 6V - allows safe interfacing with higher-voltage peripherals even when VCC = 1.5V |
| Output Leakage (IOZ) | ±10µA max at 5.5V - ensures minimal current draw in 3-state hold during controller reset sequences |
Pinout & Package
TSSOP-20 (PW) package: 6.5mm × 6.4mm body, 20-pin surface-mount with gull-wing leads; thermally optimized for reflow soldering and AOI-compatible inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (1) | Direction control input | L = B→A data flow; H = A→B - single-pin global direction selection for all 8 channels |
| A1–A8 (2–9) | Port A I/O terminals | Bidirectional data pins on A-side bus; high-impedance when OE=H or opposing port active |
| GND (10) | Ground reference | Primary return path for all output currents and internal logic; must be low-impedance |
| VCC (20) | Positive supply | Power rail setting logic thresholds and output drive strength; decoupling required within 5mm |
| B1–B8 (11–18) | Port B I/O terminals | Bidirectional data pins on B-side bus; electrically isolated from A-side when OE=H |
| OE (19) | Active-low output enable | Drives all outputs to high-Z when HIGH - used for bus arbitration, power sequencing, and hot-swap isolation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with full parametric testing - suitable for under-hood ECUs and ADAS domain controllers |
| Wettable flank compatible | Available in RKS (VQFN) variant with side-wettable leads - enables automated optical inspection of solder joints in high-reliability automotive assembly |
| Clamp diode protection | Integrated ±20mA input clamp and ±50mA output clamp - suppresses transient overvoltage events per ISO 7637-2 Pulse 1/2a/3a |
| Low dynamic power | CPD = 50pF typical - minimizes switching noise and heat generation in dense PCB layouts with multiple transceivers |
| Fast enable/disable timing | ten = 5.5ns (min), tdis = 5.5ns (min) at 5V - enables precise bus gating synchronized to microcontroller clock edges |
Applications
| Automotive Body Control Module | Infotainment System Interconnect |
|---|---|
Use Scenario: Isolating CAN/LIN gateway MCU I/O from door module sensors and actuators during firmware updates. IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling safe hot-plug of peripheral nodes while maintaining master control integrity. Use Value: Prevents bus contention during reset via OE-controlled high-Z state, reducing risk of corrupted frame transmission in Class B networks. |
Use Scenario: Level-shifting between 3.3V SoC GPIO and 5V display interface logic in head unit designs. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver translating signals across mixed-supply subsystems without external resistors. Use Value: Eliminates need for discrete level translators; 6V-tolerant inputs accept 5V signals directly while powered from 3.3V rail. |
| ADAS Camera Sensor Hub | Electric Power Steering (EPS) Interface |
Use Scenario: Driving MIPI CSI-2 parallel debug traces from image processor to diagnostic connector over 15cm FR4 traces. IC Role / Device Role / Timing Role: Transmission-line driver with matched 50Ω output impedance and <6.5ns propagation delay. Use Value: Reduces signal ringing and jitter on long traces - preserves eye diagram margin for reliable firmware dump capture. |
Use Scenario: Isolating torque sensor SPI bus from EPS motor driver MCU during fault recovery sequences. IC Role / Device Role / Timing Role: Bus gate enforcing strict directional control (DIR) and synchronous disable (OE) during safety state transitions. Use Value: Guarantees no spurious commands reach motor driver during ASIL-B reset - meets ISO 26262 hardware fault tolerance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWRQ1 | Lower drive (±24mA @ 3.3V only); 1.65V–3.6V range; 3.3V-only compatibility | Not suitable for 5V or mixed-rail systems; limited to LVCMOS domains | Select when system operates exclusively at 3.3V and lower power consumption is prioritized over voltage flexibility |
| MC74VHC245DT | Non-automotive grade; no AEC-Q100 qualification; wider temp range (−55°C to +125°C) but no HBM/CDM certification | Not approved for safety-critical vehicle functions; requires additional board-level ESD hardening | Acceptable for non-safety infotainment accessories where cost is primary constraint and automotive qualification is not mandated |
Compared with SN74AC245PWRQ1, SN74LVC245APWRQ1 trades voltage-range flexibility for lower static current, while MC74VHC245DT sacrifices automotive qualification for broader industrial temperature coverage - neither offers drop-in replacement capability due to differing supply constraints and compliance scope.
Availability
SN74AC245PWRQ1 is available at Aetrix Electronics and suitable for automotive body control, ADAS sensor interface, and infotainment interconnect applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.
Supply support for SN74AC245PWRQ1 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 automotive ICs, with decades of experience in high-reliability transportation electronics.
The SN74AC245PWRQ1 belongs to TI's automotive logic portfolio, designed specifically for robust bidirectional data routing in harsh-temperature vehicle networks - emphasizing ESD resilience, wide-VCC operation, and functional safety readiness.
FAQ
What is the maximum continuous output current rating for SN74AC245PWRQ1 at 5V?
The SN74AC245PWRQ1 supports ±24mA continuous output current per channel at 5V supply, as specified in Section 5.3 Recommended Operating Conditions. This rating ensures stable driving of 50Ω transmission lines and standard CMOS loads without thermal derating across the full −40°C to +125°C automotive temperature range. Short-burst capability up to ±75mA is documented but not sustainable continuously.
Does SN74AC245PWRQ1 support level translation between different supply voltages?
Yes, SN74AC245PWRQ1 supports level translation: its inputs tolerate up to 6V regardless of VCC, allowing 5V signals to be safely received while powered from 1.8V or 2.5V. Outputs swing rail-to-rail (VOH ≈ VCC, VOL ≈ 0V), so bidirectional translation requires matching VCC to the destination bus voltage - e.g., VCC = 3.3V for 3.3V-to-5V receive-only paths.
How should unused inputs be handled on SN74AC245PWRQ1?
All unused inputs on SN74AC245PWRQ1 must be terminated to either VCC or GND - floating CMOS inputs cause excessive power consumption and potential oscillation. TI recommends 10kΩ pull-up or pull-down resistors for uncommitted pins like DIR or OE; direct connection is acceptable for permanently fixed control lines. This requirement is explicitly stated in Section 5.3 and Application Note SLLA275.
Is SN74AC245PWRQ1 pin-compatible with standard SN74AC245 variants?
No - SN74AC245PWRQ1 shares identical pinout and function with commercial SN74AC245PW (TSSOP-20), but differs from DGS (VSSOP) and RKS (VQFN) variants in package dimensions and thermal pad configuration. The PWRQ1 suffix denotes automotive qualification and packaging; mechanical compatibility requires verifying footprint alignment, solder mask, and thermal relief per TI's SLMA001 mechanical drawing.
What is the purpose of the thermal pad in the RKS package version of SN74AC245PWRQ1?
The thermal pad in the RKS (VQFN) variant of SN74AC245PWRQ1 is electrically isolated and may be connected to GND or left floating - it must never connect to any signal or supply net. Its primary role is thermal conduction: when soldered to a GND plane, it reduces RθJB from 77.3°C/W to 40.1°C/W (per Section 5.4), improving power dissipation in high-density automotive PCBs without adding electrical functionality.
SN74AC245PWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AC245PWRQ1 FAQ
1.How can I place an order for SN74AC245PWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC245PWRQ1 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 SN74AC245PWRQ1 reliable?
The price and inventory of SN74AC245PWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC245PWRQ1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC245PWRQ1 transactions.
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4.How is shipping managed for SN74AC245PWRQ1?
SN74AC245PWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC245PWRQ1 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 SN74AC245PWRQ1?
For technical support, including SN74AC245PWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC245PWRQ1 requirements.
6.How does Aetrix verify that SN74AC245PWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AC245PWRQ1 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 SN74AC245PWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AC245PWRQ1?
All SN74AC245PWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC245PWRQ1, 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 SN74AC245PWRQ1 part is unused and in its original packaging.
Return procedure for SN74AC245PWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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