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Nexperia USA Inc. 74HC245BQ,115
- Part No.:
- 74HC245BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74HC245BQ,115.pdf
- Description:
- IC TXRX NON-INVERT 6V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
74HC245BQ,115 from Nexperia is an octal 3-state bidirectional bus transceiver with CMOS-level inputs, 2.0 V to 6.0 V supply range, and DHVQFN20 thermal-enhanced package. It enables data flow control between two 8-bit buses using DIR (direction) and active-low OE (output enable), supporting high-noise-immunity digital interfacing in industrial microcontroller peripheral expansion and memory-mapped I/O systems.
For engineers reviewing the 74HC245BQ,115 datasheet, 74HC245BQ,115 pinout, 74HC245BQ,115 application, or 74HC245BQ,115 equivalent, this device serves as a voltage-level-flexible, low-power bus isolation and direction-switching solution for PCB-level signal routing where space-constrained QFN packaging and -40 °C to +125 °C operation are required.
Technical Context
The 74HC245BQ implements non-inverting bidirectional data transfer between two 8-bit parallel buses (A0–A7 and B0–B7) under synchronous control of DIR and OE. Its CMOS input thresholds scale with VCC (VIH = 0.7×VCC min at 2.0 V), enabling robust noise margin across supply voltages.
Direction switching occurs without bus contention: OE must be LOW to enable outputs, and DIR determines whether A drives B (DIR = HIGH) or B drives A (DIR = LOW). The device includes input clamp diodes, permitting safe interface to signals exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral bus) |
| Propagation Delay (VCC = 4.5 V) | 9 ns typical - ensures sub-100 MHz bus timing compatibility with minimal skew |
| Output Drive Strength | ±7.8 mA at VCC = 4.5 V - sufficient to drive 15 pF loads across PCB traces without external buffering |
| Input Leakage Current | ±0.1 μA max at 25 °C - negligible loading on upstream logic, critical for low-power sleep modes |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial and under-hood embedded applications |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - reduces risk of handling damage during SMT assembly and field service |
| Power Dissipation (Tamb = 125 °C) | 500 mW max (SOT764-1) - enabled by DHVQFN20 thermal pad and low ICC (160 μA max) |
Pinout & Package
DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, 20-terminal leadless quad flat design with exposed thermal pad (GND-connected per layout guidance), optimized for thermal performance and PCB area efficiency in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH routes A→B, LOW routes B→A; TTL/CMOS compatible |
| 2–9 | A0–A7 | Bus A side I/O terminals - bidirectional data ports tied to one bus segment |
| 10 | GND | Ground reference and thermal pad connection point - must be soldered for thermal integrity |
| 11–18 | B0–B7 | Bus B side I/O terminals - bidirectional data ports tied to second bus segment |
| 19 | OE | Active-low output enable - HIGH forces all A/B pins into high-impedance state for bus sharing |
| 20 | VCC | Positive supply rail - decoupling capacitor (100 nF) required within 5 mm for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0 V to 6.0 V operation eliminates need for level shifters in multi-rail systems |
| Thermal-Enhanced QFN | DHVQFN20 package delivers 12.9 mW/K derating above 111 °C - sustains full drive strength at 125 °C ambient |
| Clamp Diode Inputs | Integrated input clamps allow safe interface to overvoltage signals (e.g., 12 V sensor lines) with series resistors |
| High Noise Immunity | Typical VIH/VIL margins exceed 40% of VCC - prevents false triggering in electrically noisy industrial environments |
| JEDEC Compliance | Meets JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards - ensures interoperability with certified logic families |
Applications
| Microcontroller Peripheral Expansion | Memory-Mapped I/O Interface |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive multiple SPI peripherals and LED arrays via shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional bus isolator that switches direction under software control to separate read/write cycles on multiplexed bus lines. Use Value: Eliminates need for discrete MOSFET switches or dual-direction level translators while maintaining <10 ns propagation delay for real-time response. | Use Scenario: Interfacing an FPGA's general-purpose I/O bank to legacy 8-bit parallel flash memory with shared data/address lines. IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing FPGA output writes and flash read-backs on same physical pins. Use Value: Enables single-pin reuse for both address latching and data transfer, reducing FPGA pin count by 8 and simplifying PCB routing. |
| Industrial Sensor Data Aggregation | Legacy Bus Signal Conditioning |
Use Scenario: Consolidating analog-to-digital converter outputs from eight temperature sensors onto a central CAN controller's parallel diagnostic bus. IC Role / Device Role / Timing Role: Isolating sensor-side logic from controller-side noise while allowing bidirectional calibration command flow. Use Value: Input clamp diodes protect against ESD events from field wiring; ±7.8 mA drive ensures reliable signaling across 15 cm PCB traces. | Use Scenario: Adapting RS-232 level-shifted signals to a 3.3 V microcontroller's parallel debug port without introducing ground loops. IC Role / Device Role / Timing Role: Level-tolerant buffer providing galvanic isolation between legacy serial interface and modern low-voltage logic. Use Value: 2.0 V minimum VCC allows direct use with 2.5 V LDO rails; 0.1 μA leakage prevents battery drain in always-on monitoring nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245BQ,115 | TTL-compatible inputs (VIH = 2.0 V min), identical pinout and timing | Better suited for interfacing with legacy 5 V TTL logic; slightly higher ICC at 125 °C | Select when mixing with 74LS/74F families or driving older peripheral ICs requiring TTL thresholds |
| SN74LVC245APWR | 3.3 V only (1.65–3.6 V), lower propagation delay (5.3 ns @ 3.3 V), different pinout (TSSOP24) | Requires level translation for 5 V systems; not drop-in replaceable due to package and pin count mismatch | Choose for high-speed 3.3 V-only designs where board space permits TSSOP24 and faster timing is critical |
Compared with 74HCT245BQ,115, the HC version offers wider voltage flexibility but lacks TTL input compatibility; versus SN74LVC245APWR, it trades speed and 3.3 V optimization for universal 2–6 V operation and direct DHVQFN20 footprint compatibility.
Availability
74HC245BQ,115 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC245BQ,115 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 focused on essential efficiency technologies, delivering high-performance logic, power, analog, and RF components for automotive, industrial, and consumer markets.
The 74HC245BQ belongs to Nexperia's standard logic portfolio designed for robust, pin-compatible replacement of legacy 74-series devices in space- and thermal-constrained applications demanding wide supply range and high reliability.
FAQ
What is the maximum clock frequency supported by the 74HC245BQ,115?
The 74HC245BQ,115 does not operate on a clock signal-it is an asynchronous transceiver. Its usable data rate depends on propagation delay (7 ns min at VCC = 6.0 V) and bus capacitance. With 15 pF load and 4.5 V supply, tpd = 9 ns supports reliable 50 MHz bus toggling (20 ns period), assuming proper termination and layout.
Can the 74HC245BQ,115 be used to interface 3.3 V and 5 V logic domains?
No-74HC245BQ,115 is not a level shifter. It operates from a single VCC rail (2.0–6.0 V) and translates no voltage. To interface 3.3 V and 5 V domains, VCC must be set to the higher voltage (e.g., 5 V), and 3.3 V inputs must remain within VIH/VIL specs (VIH ≥ 3.5 V at VCC = 5 V). For true bidirectional level shifting, use dedicated translators like TXB0108.
Is the thermal pad on the DHVQFN20 package electrically connected?
Yes-the exposed thermal pad (terminal 10) is internally connected to GND. Per Nexperia's layout guidelines, it must be soldered to a PCB GND plane using ≥4 thermal vias (0.3 mm diameter) to ensure thermal performance and mechanical reliability. Floating the pad degrades Ptot derating and risks solder joint fatigue.
How does the 74HC245BQ,115 handle bus contention during direction switching?
Bus contention is prevented by design: outputs enter high-impedance state whenever OE is HIGH, regardless of DIR state. To safely switch direction, assert OE HIGH first, wait ≥tdis (38 ns max at 125 °C), change DIR, then assert OE LOW. This three-step sequence ensures no overlap between opposing drivers on the same net.
74HC245BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74HC245BQ,115 FAQ
1.How can I place an order for 74HC245BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC245BQ,115 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 74HC245BQ,115 reliable?
The price and inventory of 74HC245BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HC245BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC245BQ,115?
74HC245BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC245BQ,115 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 74HC245BQ,115?
For technical support, including 74HC245BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245BQ,115 requirements.
6.How does Aetrix verify that 74HC245BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HC245BQ,115 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 74HC245BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HC245BQ,115?
All 74HC245BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245BQ,115, 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 74HC245BQ,115 part is unused and in its original packaging.
Return procedure for 74HC245BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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