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Nexperia USA Inc. 74HCT245BQ-Q100X
- Part No.:
- 74HCT245BQ-Q100X
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74HCT245BQ-Q100X.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
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Product details
Overview
74HCT245BQ-Q100 from Nexperia is an automotive-grade octal bidirectional bus transceiver with 3-state outputs, DIR and OE control inputs, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), propagation delay of 10 ns typical (VCC = 5.0 V, CL = 15 pF), and AEC-Q100 Grade 1 qualification (-40 °C to +125 °C). It enables level-shifted data routing between microcontroller buses and peripheral modules in engine control units.
For engineers reviewing the 74HCT245BQ-Q100 datasheet, 74HCT245BQ-Q100 pinout, 74HCT245BQ-Q100 application, or 74HCT245BQ-Q100 equivalent, key selection criteria include bidirectional direction control timing, 3-state enable/disable latency (ten = 16 ns typ, tdis = 16 ns typ), output drive strength (±6 mA), thermal-enhanced DHVQFN20 package with side-wettable flanks, and automotive temperature compliance.
Technical Context
This device implements non-inverting bidirectional data transfer using a single DIR pin to select direction (A→B or B→A) and an active-low OE pin to place all outputs in high-impedance state. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
It operates across a 4.5 V to 5.5 V supply range with TTL-level input compatibility, ensuring seamless integration with legacy 5 V logic systems. Static and dynamic parameters-including VIH/VIL thresholds, VOH/VOL levels, propagation delay (tpd), enable/disable times (ten/tdis), and transition time (tt)-are fully specified over the full -40 °C to +125 °C automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in 5 V automotive power domains with ±10 % tolerance. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees reliable recognition of standard TTL logic levels. |
| Propagation Delay | 10 ns typical (VCC = 5.0 V, CL = 15 pF) - Supports 50+ MHz bus data rates with deterministic timing. |
| Enable/Disable Time | ten = 16 ns, tdis = 16 ns typical - Enables fast bus arbitration and multi-master contention management. |
| Output Drive | ±6 mA (VOH/VOL @ VCC = 4.5 V) - Sufficient for driving 15 pF loads across PCB traces without signal degradation. |
| Operating Temperature | -40 °C to +125 °C - Qualified per AEC-Q100 Grade 1 for under-hood and transmission control applications. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Mitigates assembly-line and field handling electrostatic risks. |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, no leads, 20 terminals, side-wettable flanks for AOI-compatible solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW = A→B data flow; HIGH = B→A - Determines real-time bus data path polarity. |
| 2–9 (A0–A7) | Port A I/O | Bidirectional data terminals on side A - Connect to MCU or ASIC bus interface. |
| 10 (GND) | Ground reference | 0 V return path for all signals and supply - Must be low-impedance for noise immunity. |
| 11–18 (B0–B7) | Port B I/O | Bidirectional data terminals on side B - Interface to sensor cluster, display controller, or CAN PHY buffer. |
| 19 (OE) | Output enable (active LOW) | LOW = outputs enabled; HIGH = all outputs in high-Z - Enables bus sharing among multiple devices. |
| 20 (VCC) | Power supply | +4.5 V to +5.5 V supply rail - Requires local 100 nF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40 °C to +125 °C ambient - Eliminates need for additional reliability screening. |
| TTL-compatible inputs | VIH/VIL thresholds match legacy 5 V TTL families - Enables drop-in replacement without level-shifter redesign. |
| DHVQFN20 with side-wettable flanks | Enables automated optical inspection of solder joints - Reduces post-reflow defect escape in high-volume automotive manufacturing. |
| Clamp diode-equipped inputs | Allows safe interface to voltages up to VCC + 0.5 V using series resistors - Prevents latch-up during hot-swap or fault conditions. |
| Low dynamic power dissipation | CPD = 30 pF - Limits switching current and heat generation in dense ECU layouts. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Interface |
|---|---|
Use Scenario: Bidirectional data exchange between 32-bit RISC microcontroller and analog sensor front-end ICs (e.g., pressure, temperature, knock sensors). IC Role / Device Role / Timing Role: Bus transceiver isolating MCU address/data bus from noisy analog subsystems while supporting shared interrupt signaling. Use Value: Enables precise timing alignment (tpd ≤ 10 ns) and glitch-free bus handover during sensor calibration sequences. | Use Scenario: Interfacing MIPI CSI-2 bridge IC to image signal processor in surround-view camera module. IC Role / Device Role / Timing Role: Level-translating and buffering parallel control/status lines (e.g., reset, clock enable, frame sync) between voltage-isolated domains. Use Value: Maintains signal integrity across 10 cm PCB traces with <15 pF load, preventing setup/hold violations at 25 MHz pixel clock edges. |
| Transmission Control Module (TCM) | Automotive Infotainment Head Unit |
Use Scenario: Isolating CAN FD transceiver control lines from main SoC while enabling firmware update command forwarding. IC Role / Device Role / Timing Role: Direction-controlled data conduit for bootloader commands and diagnostic responses over isolated 5 V logic rails. Use Value: Guarantees sub-20 ns enable/disable latency (ten/tdis) to meet ISO 14229 UDS timing requirements for flash programming. | Use Scenario: Managing GPIO expansion between application processor and touch controller, audio codec, and display timing controller. IC Role / Device Role / Timing Role: 3-state bus multiplexer enabling shared access to 8-bit control registers across three peripherals. Use Value: Eliminates need for discrete logic gates or FPGA resources-reducing BOM cost and layout area by 35% versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | CMOS input thresholds (VIH = 0.7×VCC), 1.65–3.6 V supply range - not automotive qualified. | Targeted at consumer/portable electronics; lacks AEC-Q100 validation and extended temperature support. | Select only for non-automotive designs requiring lower voltage operation or higher noise margin at 3.3 V. |
| 74LVCH245AQ20X | 3.3 V only (2.7–3.6 V), dual-supply I/O capability, same DHVQFN20 package - AEC-Q100 Grade 1 qualified. | Optimized for mixed-voltage 3.3 V/5 V interfaces; requires level translation if paired with 5 V MCU. | Prefer when system uses 3.3 V logic domains and demands identical footprint and qualification. |
Compared with SN74LVC245APWR and 74LVCH245AQ20X, the 74HCT245BQ-Q100 uniquely delivers TTL-compatible inputs, 4.5–5.5 V operation, and AEC-Q100 Grade 1 compliance in a thermally enhanced DHVQFN20 package-making it the sole choice for direct replacement of legacy 74LS245 in automotive 5 V bus architectures.
Availability
74HCT245BQ-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and ADAS camera interfaces requiring stable component supply across automotive production lifecycles.
Supply support for 74HCT245BQ-Q100 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
Nexperia is a global semiconductor expert delivering high-performance, reliable components for automotive, industrial, and consumer markets, with leadership in logic, MOSFETs, and ESD protection.
The 74HCT series targets automotive and industrial applications requiring TTL-compatible 5 V logic interoperability, robustness against voltage transients, and guaranteed operation across extreme temperature ranges.
FAQ
What is the maximum recommended operating frequency for data transfer through the 74HCT245BQ-Q100?
The device does not specify a maximum clock frequency, but its 10 ns typical propagation delay (VCC = 5.0 V, CL = 15 pF) supports reliable data transfer up to approximately 50 MHz in point-to-point configurations. System-level timing must account for board trace delays, load capacitance, and setup/hold margins-especially in multi-drop bus topologies where cumulative skew may limit effective rate.
Can the 74HCT245BQ-Q100 safely interface a 3.3 V microcontroller with a 5 V peripheral?
No-it is not a level shifter. Its inputs require TTL-compatible thresholds (VIH ≥ 2.0 V), but outputs swing rail-to-rail (0 V to VCC). Driving a 5 V peripheral from a 3.3 V MCU violates VIH minimum; conversely, connecting its 5 V outputs directly to a 3.3 V MCU input risks overvoltage damage. Use dedicated level translators like TXB0108 for cross-voltage domain interfacing.
Is the exposed thermal pad (pin 10) required to be soldered to ground?
No. Per datasheet note: "This is not a ground pin. There is no electrical or mechanical requirement to solder the pad." If soldered, the land must remain floating or be connected to GND-never left as an unconnected copper island, which can cause solder voiding or thermal stress during reflow.
How does the DIR pin behavior differ from separate transmit/receive enable pins in other transceivers?
The DIR pin selects data direction unidirectionally: LOW enables A→B flow, HIGH enables B→A flow. Unlike transceivers with independent TxEN/RxEN controls, it does not support simultaneous bidirectional operation. This simplifies control logic in master-slave bus architectures but requires coordinated OE assertion to avoid bus contention during direction changes.
74HCT245BQ-Q100X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74HCT245BQ-Q100X FAQ
1.How can I place an order for 74HCT245BQ-Q100X through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245BQ-Q100X 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 74HCT245BQ-Q100X reliable?
The price and inventory of 74HCT245BQ-Q100X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245BQ-Q100X is usually 5 days.
3.What payment methods are accepted for 74HCT245BQ-Q100X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245BQ-Q100X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245BQ-Q100X?
74HCT245BQ-Q100X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245BQ-Q100X 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 74HCT245BQ-Q100X?
For technical support, including 74HCT245BQ-Q100X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245BQ-Q100X requirements.
6.How does Aetrix verify that 74HCT245BQ-Q100X is sourced from the original manufacturer or authorized distributors?
All 74HCT245BQ-Q100X 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 74HCT245BQ-Q100X meets industry standards.
7.What is the process for return or replacement of 74HCT245BQ-Q100X?
All 74HCT245BQ-Q100X units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245BQ-Q100X, 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 74HCT245BQ-Q100X part is unused and in its original packaging.
Return procedure for 74HCT245BQ-Q100X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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