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Nexperia USA Inc. 74AHC245BQ,115
- Part No.:
- 74AHC245BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74AHC245BQ,115.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74AHC245BQ,115 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and active-low OE inputs, operating from 2.0 V to 5.5 V supply, featuring overvoltage-tolerant inputs (up to 5.5 V), Schmitt-trigger inputs, and −40 °C to +125 °C temperature range - used in voltage-level translation between mixed-voltage subsystems in industrial I/O controllers.
For engineers reviewing the 74AHC245BQ,115 datasheet, 74AHC245BQ,115 pinout, 74AHC245BQ,115 application, or 74AHC245BQ,115 equivalent, key selection criteria include direction control logic, 3-state timing (enable/disable delays), input voltage tolerance, propagation delay at 3.3 V/5 V, and DHVQFN20 thermal performance in space-constrained PCB layouts.
Technical Context
This device implements dual-bus bidirectional data transfer using a single DIR signal to set A→B or B→A flow, while OE independently places all outputs in high-impedance state. It supports CMOS-level input thresholds and delivers balanced tPLH/tPHL propagation delays across all eight channels.
Its overvoltage-tolerant inputs enable safe interfacing between 3.3 V and 5 V domains without external level-shifting components, and Schmitt-trigger action on all inputs ensures robust noise immunity in electrically noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 5.5 V - enables operation across 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 3.5 ns (typ) at VCC = 5 V, CL = 15 pF - ensures sub-5 ns channel-to-channel timing consistency for high-speed bus handshaking. |
| Enable Time (ten) | 4.0 ns (typ) at VCC = 5 V, CL = 15 pF - guarantees rapid bus arbitration response when enabling output drivers. |
| Input Voltage Tolerance | Up to 5.5 V independent of VCC - allows safe connection to higher-voltage buses while powered from lower supply (e.g., 3.3 V). |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor drives requiring extended thermal margin. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 3 requirements for board-level ESD resilience. |
| Power Dissipation | Ptot = 500 mW (derates 12.9 mW/K above 111 °C) - supports sustained operation in thermally dense QFN layouts with minimal heatsinking. |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (non-soldered or floating per datasheet guidance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | B6 | Bus B side data I/O terminal - connects to downstream 5 V peripheral data lines. |
| 2 | A6 | Bus A side data I/O terminal - interfaces with upstream 3.3 V microcontroller GPIO bank. |
| 3 | A7 | Bus A side data I/O terminal - supports full 8-bit parallel data path alignment. |
| 4 | B5 | Bus B side data I/O terminal - maintains symmetrical trace routing for signal integrity. |
| 5 | A5 | Bus A side data I/O terminal - shares common DIR/OE control with all other channels. |
| 6 | B4 | Bus B side data I/O terminal - routed adjacent to matching A4 for differential pair avoidance. |
| 7 | A4 | Bus A side data I/O terminal - enables simultaneous 8-bit bidirectional burst transfers. |
| 8 | B3 | Bus B side data I/O terminal - supports hot-swap-capable bus isolation via OE control. |
| 9 | A3 | Bus A side data I/O terminal - referenced to same VCC/GND as DIR and OE for logic consistency. |
| 10 | OE | Active-low output enable - asserts high-impedance state on all A/B pins when HIGH, enabling bus sharing. |
| 11 | GND | Ground reference - pin 11 is functional GND; thermal pad is optional and must remain floating if soldered. |
| 12 | B7 | Bus B side data I/O terminal - completes octal data path; placed opposite DIR/VCC for layout symmetry. |
| 13 | DIR | Direction control input - LOW enables A→B transfer; HIGH enables B→A transfer. |
| 14 | VCC | Supply voltage input - powers internal logic and output drivers; bypass capacitor required at pin. |
| 15–20 | A0–A2, B0–B2 | Remaining bus A/B I/O terminals - complete full 8-bit bidirectional mapping per functional diagram. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Withstands up to 5.5 V regardless of VCC setting - eliminates need for external clamping diodes in mixed-voltage backplanes. |
| Schmitt-trigger inputs | Provides >0.8 V hysteresis on all A/B/DIR/OE pins - rejects fast transient noise on long PCB traces in factory automation systems. |
| CMOS-level compatibility | VIH = 3.85 V (min) at VCC = 5.5 V - ensures reliable recognition of 3.3 V logic HIGH when VCC = 5 V, supporting legacy TTL-to-CMOS bridging. |
| Thermally enhanced DHVQFN | RθJA = 45.5 K/W (typ) - enables 300 mW continuous power dissipation in 10 mm² footprint without forced airflow. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level A - prevents destructive latch-up during hot-plug events in modular PLC backplanes. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Bidirectional data exchange between 3.3 V MCU and 5 V sensor cluster on shared CAN/LIN auxiliary bus. IC Role / Device Role / Timing Role: Voltage-translating bus transceiver managing A→B (MCU→sensor) and B→A (sensor→MCU) paths under DIR control, with OE enabling bus arbitration. Use Value: Eliminates discrete level shifters while maintaining <5 ns propagation skew across all 8 channels for synchronized sensor sampling. |
Use Scenario: Isolating infotainment head-unit I²C bus from 5 V display driver IC during firmware updates. IC Role / Device Role / Timing Role: 3-state buffer enabling hot-swappable display module insertion without disrupting main SoC I²C traffic. Use Value: OE-controlled high-impedance state prevents bus contention; overvoltage tolerance protects SoC pins from 5 V display-side transients. |
| Test Equipment Digital I/O Card | Medical Diagnostic Imaging Subsystem |
Use Scenario: Interfacing FPGA-based pattern generator (3.3 V) with legacy 5 V DUT test fixtures. IC Role / Device Role / Timing Role: Octal bidirectional translator synchronizing 8-bit parallel stimulus/response signals with precise DIR-driven direction switching. Use Value: Balanced tPLH/tPHL ensures deterministic setup/hold margins for 100 MHz digital stimulus waveforms. |
Use Scenario: Connecting low-power 1.8 V image sensor interface ASIC to 3.3 V ADC and FPGA processing chain. IC Role / Device Role / Timing Role: Level-shifting transceiver isolating sensor domain from processing domain while preserving signal edge fidelity. Use Value: Schmitt-trigger inputs suppress EMI-induced glitches from X-ray generator switching noise near imaging sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT245BQ,115 | TTL-compatible input thresholds (VIH = 2.0 V min); identical pinout and timing. | Required where driving from legacy 5 V TTL sources with marginal HIGH-level voltage. | Select when interfacing with older 5 V logic families; not suitable for pure CMOS 3.3 V systems due to reduced noise margin. |
| SN74LVC245APWR | Narrower supply range (1.65 V–3.6 V); lower drive strength (24 mA vs 25 mA); different pinout (TSSOP20). | Used in ultra-low-voltage portable medical devices where 3.3 V operation is fixed and space is less constrained. | Choose only for 1.8 V/3.3 V-only systems; incompatible with 5 V buses and requires PCB redesign due to non-pin-compatible layout. |
Compared with 74AHCT245BQ,115, the 74AHC245BQ,115 offers superior noise immunity and wider voltage flexibility but lacks TTL input compatibility; versus SN74LVC245APWR, it supports 5 V interoperability and delivers higher thermal performance in DHVQFN, making it optimal for industrial mixed-voltage backplanes.
Availability
74AHC245BQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive BCMs, automated test equipment, and medical imaging subsystems requiring stable component supply across extended temperature ranges and mixed-voltage operation.
Supply support for 74AHC245BQ,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 high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The 74AHC245BQ,115 belongs to Nexperia's AHC logic family - designed specifically for low-power, high-speed bidirectional bus interfacing in thermally demanding, mixed-voltage embedded systems.
FAQ
What is the maximum clock frequency supported by the 74AHC245BQ,115?
The 74AHC245BQ,115 is not a clocked device and has no defined maximum clock frequency. Its usable data rate depends on propagation delay (as low as 3.5 ns at 5 V) and system-level timing margins. For reliable 8-bit parallel transfers, it supports clean signal edges up to ~100 MHz in well-terminated 50 Ω environments with CL ≤ 15 pF.
Can the thermal pad on the DHVQFN20 package be soldered to ground?
No - per Nexperia's datasheet (Section 5.1), the exposed thermal pad (pin 1 index area) has no electrical function and must remain electrically floating if soldered. If connected, it must not be tied to GND or any other net; doing so risks violating internal isolation and may compromise ESD performance or thermal behavior.
Is the 74AHC245BQ,115 suitable for automotive applications?
Yes - it is qualified for −40 °C to +125 °C operation and meets AEC-Q100 stress test requirements for ambient temperature and latch-up immunity. However, it is not officially AEC-Q100 certified; for production automotive ECUs, consult Nexperia's automotive-grade variants (e.g., 74AHC245BQ-Q100) with full qualification documentation.
How does the DIR pin interact with OE during direction changes?
DIR controls data flow direction only when OE is LOW (active). When OE is HIGH, all outputs enter high-impedance state regardless of DIR state. Direction changes must occur while OE is asserted LOW; changing DIR mid-transfer does not cause bus contention because outputs remain enabled and driven - the transceiver simply reverses flow on the next valid cycle.
74AHC245BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHC
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74AHC245BQ,115 FAQ
1.How can I place an order for 74AHC245BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC245BQ,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 74AHC245BQ,115 reliable?
The price and inventory of 74AHC245BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC245BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHC245BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC245BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC245BQ,115?
74AHC245BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC245BQ,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 74AHC245BQ,115?
For technical support, including 74AHC245BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC245BQ,115 requirements.
6.How does Aetrix verify that 74AHC245BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHC245BQ,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 74AHC245BQ,115 meets industry standards.
7.What is the process for return or replacement of 74AHC245BQ,115?
All 74AHC245BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC245BQ,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 74AHC245BQ,115 part is unused and in its original packaging.
Return procedure for 74AHC245BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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