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Texas Instruments SN74AHC245QDWRQ1
- Part No.:
- SN74AHC245QDWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC245QDWRQ1.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
SN74AHC245QDWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal bus transceiver with 3-state outputs, supporting bidirectional data flow between two 8-bit buses (A↔B) under 2V–5.5V supply, featuring direction control (DIR) and active-low output enable (OE), used in vehicle body control modules for isolated signal routing during controller reset or bus arbitration.
For engineers reviewing the SN74AHC245QDWRQ1 datasheet, SN74AHC245QDWRQ1 pinout, SN74AHC245QDWRQ1 application, or SN74AHC245QDWRQ1 equivalent, key selection criteria include automotive temperature range (–40°C to +125°C), 3.3 V/5 V switching performance, latch-up immunity (>250 mA), HBM ESD level 2, and TSSOP-20 package compatibility with board-level AOI inspection via wettable flanks.
Technical Context
The SN74AHC245QDWRQ1 implements asynchronous bidirectional bus communication using a single DIR input to select data path direction (A→B or B→A) and an active-low OE input to place all outputs in high-impedance state, enabling bus isolation without external timing constraints. Its CMOS inputs require fast transitions (<100 ns/V at 3.3 V) to prevent oscillation and excessive power draw.
It features balanced 3-state CMOS outputs capable of sourcing/sinking ±4 mA at 3.3 V and ±8 mA at 5 V while maintaining VOL ≤ 0.44 V and VOH ≥ 2.48 V across –40°C to +125°C. Internal clamp diodes protect against transient overvoltage on I/O pins, and thermal design relies on RθJA = 122.3°C/W for the PW (TSSOP-20) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports dual-rail systems and legacy 5 V or modern 3.3 V automotive domains |
| Operating Temp | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for engine bay and chassis-mounted ECUs |
| tPLH/tPHL (CL=15 pF) | 4 ns (5 V), 5.8 ns (3.3 V) - enables reliable 100+ MHz bus toggling in CAN/LIN gateway interfaces |
| IOL/IOH | ±8 mA @ 5 V - drives standard CMOS loads and short PCB traces without external buffers |
| IOZ (High-Z Leakage) | ±2.5 µA max - ensures minimal bus leakage during isolation, critical for low-power sleep modes |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - meets automotive system-level ESD robustness requirements |
| Propagation Delay Skew | ≤1 ns (typ) - maintains channel-to-channel timing integrity across all eight data lines |
Pinout & Package
PW package: 20-pin TSSOP, 6.5 mm × 6.4 mm footprint, wettable flanks for AOI-compatible solder joint inspection. Thermal pad not present - no exposed die attach pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | L = B→A data flow; H = A→B; determines real-time bus arbitration path without clocking |
| 2–9 (A1–A8) | Bus A I/O channels | Configurable as input or output depending on DIR; share same electrical characteristics as B-side |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance for noise immunity |
| 11–18 (B8–B1) | Bus B I/O channels | Reversed pin order (B8 to B1) matches TI's standard TSSOP layout for PCB routing symmetry |
| 19 (OE) | Active-low output enable | Pulling high disables all outputs into high-Z; tie to VCC via pullup resistor for power-up safety |
| 20 (VCC) | Positive supply | Single rail powers all logic and I/O; bypass with 0.1 µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from –40°C to +125°C ambient, meeting automotive ECU placement requirements |
| Wettable flank leads (PW package) | Enables automated optical inspection of side-solder fillets, improving manufacturing yield in automotive SMT lines |
| Balanced 3-state drive strength | Sources and sinks equal current (±8 mA @ 5 V), eliminating need for external pull resistors in push-pull bus designs |
| Input transition rate limit | 100 ns/V at 3.3 V - prevents shoot-through and dynamic power spikes during slow-edge signal routing |
| Clamp diode protection | Integrated negative clamps on all inputs and bidirectional clamps on I/Os - suppresses ESD and inductive kickback in motor-control interfaces |
Applications
| Body Control Module Bus Isolation | Instrument Cluster Signal Multiplexing |
|---|---|
Use Scenario: Isolating LIN or CAN sub-bus segments during microcontroller reset or firmware update to prevent spurious commands. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling controlled A↔B data handoff with <10 ns propagation delay skew across all 8 channels. Use Value: Eliminates need for discrete MOSFET switches or optocouplers, reducing BOM count and PCB area while maintaining AEC-Q100 compliance. | Use Scenario: Routing display refresh signals from MCU to multiple segmented LCD drivers with shared timing constraints. IC Role / Device Role / Timing Role: Octal transceiver synchronizing parallel pixel data streams under DIR-controlled direction, minimizing inter-channel skew. Use Value: Supports simultaneous 8-bit data transfer at >50 MHz with guaranteed VOL ≤ 0.44 V at 125°C, ensuring display stability in hot-cabin environments. |
| Powertrain Sensor Interface Buffering | ADAS Camera Link Signal Conditioning |
Use Scenario: Interfacing analog sensor ADC outputs to a central domain controller across long PCB traces subject to EMI. IC Role / Device Role / Timing Role: Signal repeater with 3-state capability, driven by OE to decouple noisy sensor domains during diagnostic cycles. Use Value: Provides ±250 mA latch-up immunity and ±2000 V HBM ESD protection - exceeds ISO 10605 requirements for under-hood sensors. | Use Scenario: Level-shifting and isolating MIPI CSI-2 D-PHY clock/data lanes between image sensor and SoC in rear-view camera modules. IC Role / Device Role / Timing Role: Low-skew octal buffer managing bidirectional control signals (e.g., I²C configuration) with precise 3.3 V timing margins. Use Value: Delivers tPLH/tPHL ≤ 5.8 ns at 3.3 V with <1 ns channel skew - preserves setup/hold timing for 400 kHz I²C configuration writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245AQPWRQ1 | Lower VCC range (1.65–5.5 V); higher drive (±24 mA @ 3.3 V); faster tPLH (2.5 ns @ 3.3 V) | Better suited for high-speed 3.3 V-only domains; less tolerant of 2 V brownout conditions | Select when system operates strictly at 3.3 V and requires higher sink/source margin for capacitive loads >50 pF |
| MC74VHC245DTG | Non-automotive grade; wider VCC (2–5.5 V); same pinout; no AEC-Q100 qualification | Not suitable for production automotive ECUs; acceptable for lab validation or non-safety prototypes | Choose only for cost-sensitive non-automotive industrial applications where AEC-Q100 is not mandated |
Compared with SN74LVC245AQPWRQ1 and MC74VHC245DTG, the SN74AHC245QDWRQ1 uniquely balances wide supply range (2–5.5 V), Grade 1 thermal compliance, and TSSOP-20 wettable-flank manufacturability - making it optimal for mixed-voltage automotive gateways requiring field-replaceable reliability.
Availability
SN74AHC245QDWRQ1 is available at Aetrix Electronics and suitable for body control modules, instrument clusters, powertrain sensor interfaces, and ADAS camera link subsystems requiring stable component supply across extended automotive lifecycles.
Supply support for SN74AHC245QDWRQ1 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 U.S.-based semiconductor company specializing in analog and embedded processing solutions, with leadership in automotive-grade logic, power management, and interface ICs.
The SN74AHC245QDWRQ1 belongs to TI's AHC logic family designed specifically for automotive signal integrity and robustness - emphasizing latch-up immunity, extended temperature operation, and manufacturable packaging for Tier 1 ECU suppliers.
FAQ
What is the maximum capacitive load the SN74AHC245QDWRQ1 can drive while meeting all datasheet specifications?
The SN74AHC245QDWRQ1 is characterized and guaranteed to meet all AC and DC specifications with a total load capacitance ≤50 pF. This includes trace capacitance, receiver input capacitance, and probe effects. Driving >50 pF may increase propagation delay beyond spec (e.g., tPLH up to 13.5 ns at 50 pF/5 V), reduce noise margin, or cause ringing - requiring series damping or buffer staging. The SN74AHC245QDWRQ1 datasheet explicitly states this 50 pF limit in Section 8.2.1.1.
How should the OE pin be handled during power-up to ensure safe high-impedance state on the SN74AHC245QDWRQ1?
To guarantee high-impedance outputs during power-up or power-down transients, the OE pin of the SN74AHC245QDWRQ1 must be tied to VCC through an external pullup resistor. TI specifies that the minimum resistor value depends on the current-sinking capability of the driving source - typically 4.7 kΩ to 10 kΩ suffices for most microcontroller GPIOs. Leaving OE floating risks undefined output states, bus contention, or excessive ICC. This requirement is documented in both Section 3 (Description) and Section 7.1 (Overview) of the SN74AHC245QDWRQ1 datasheet.
Does the SN74AHC245QDWRQ1 support mixed-voltage operation between A and B buses?
No, the SN74AHC245QDWRQ1 does not support true mixed-voltage operation: both A and B buses share the same VCC supply rail and operate at identical logic thresholds defined by that single VCC voltage. While the device functions across 2 V–5.5 V, all I/Os (A1–A8 and B1–B8) swing between GND and the common VCC. Level translation between different voltage domains (e.g., 3.3 V ↔ 5 V) requires external circuitry or a dedicated level-shifter IC - the SN74AHC245QDWRQ1 datasheet makes no provision for independent bus voltage domains.
What is the purpose of the wettable flanks on the SN74AHC245QDWRQ1 PW package?
The wettable flanks on the SN74AHC245QDWRQ1 PW (TSSOP-20) package provide enhanced side-solder fillet formation during reflow, enabling reliable automatic optical inspection (AOI) of solder joint quality - a critical requirement for automotive manufacturing process control. Unlike standard TSSOP leads, the flank geometry increases surface area for solder adhesion, improving defect detection rates for head-in-pillow or insufficient wetting failures. This feature is confirmed in Section 7.3.3 and Figure 7-1 of the SN74AHC245QDWRQ1 datasheet.
Can unused input pins on the SN74AHC245QDWRQ1 be left floating?
No, unused input pins (including DIR and OE if not actively driven) on the SN74AHC245QDWRQ1 must never be left floating. TI mandates termination to either VCC or GND - directly or via a pullup/pulldown resistor - to prevent CMOS input instability, excessive current draw, or oscillation. A 10 kΩ resistor is recommended for default-HIGH (pullup) or default-LOW (pulldown) biasing. This requirement is specified in Section 5.3 (Recommended Operating Conditions) footnote and reiterated in Sections 7.3.1 and 8.2.1.2 of the SN74AHC245QDWRQ1 datasheet.
SN74AHC245QDWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC245QDWRQ1 FAQ
1.How can I place an order for SN74AHC245QDWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC245QDWRQ1 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 SN74AHC245QDWRQ1 reliable?
The price and inventory of SN74AHC245QDWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC245QDWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHC245QDWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC245QDWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC245QDWRQ1?
SN74AHC245QDWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC245QDWRQ1 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 SN74AHC245QDWRQ1?
For technical support, including SN74AHC245QDWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC245QDWRQ1 requirements.
6.How does Aetrix verify that SN74AHC245QDWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC245QDWRQ1 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 SN74AHC245QDWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC245QDWRQ1?
All SN74AHC245QDWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC245QDWRQ1, 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 SN74AHC245QDWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC245QDWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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