My Inquiry
My Account
Nexperia USA Inc. 74AHCT245BQ,115
- Part No.:
- 74AHCT245BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74AHCT245BQ,115.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,438
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74AHCT245BQ,115 from Nexperia is an octal 3-state bus transceiver with TTL-compatible input thresholds, direction control (DIR), and active-low output enable (OE), operating from 4.5 V to 5.5 V supply. It supports bidirectional data flow between two 8-bit buses, features overvoltage-tolerant inputs up to 5.5 V, and is rated for -40 °C to +125 °C operation in the DHVQFN20 package.
For engineers reviewing the 74AHCT245BQ,115 datasheet, 74AHCT245BQ,115 pinout, 74AHCT245BQ,115 application, or 74AHCT245BQ,115 equivalent, key selection criteria include TTL-level input compatibility, 3-state bus isolation timing (tpd ≤ 10.0 ns at 5 V/50 pF), thermal-enhanced QFN packaging, and mixed-voltage translation capability between 3.3 V and 5 V domains.
Technical Context
The 74AHCT245BQ,115 implements a dual-bus bidirectional interface using complementary CMOS logic with Schmitt-trigger inputs for noise immunity. Its DIR pin selects data flow direction (A→B or B→A), while OE controls high-impedance state on all 16 I/O lines simultaneously.
It operates strictly within TTL input voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) and delivers rail-to-rail CMOS outputs capable of driving ±8 mA loads. Propagation delay is tightly specified across temperature (−40 °C to +125 °C) and load (15–50 pF), with disable time tdis ≤ 12.5 ns at 5 V/50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V logic systems and tolerance against supply ripple. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Matches TTL logic families for seamless interfacing with legacy microcontrollers and peripherals. |
| Propagation Delay | tpd ≤ 10.0 ns (VCC = 5 V, CL = 50 pF) - Enables reliable operation in high-speed parallel bus applications up to ~50 MHz. |
| Output Drive | ±8 mA (VOH/VOL @ VCC = 5 V) - Sufficient to drive multiple CMOS/TTL loads without external buffering. |
| Operating Temperature | −40 °C to +125 °C - Qualified for industrial and extended-temperature embedded control environments. |
| Input Overvoltage Tolerance | Up to 5.5 V - Allows safe connection to higher-voltage buses during level translation without clamping diodes or external protection. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Robust handling during PCB assembly and field operation in noisy industrial settings. |
Pinout & Package
DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (non-soldered by default); optimized for high-density PCB layouts and improved thermal dissipation over SO20/TSSOP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables A→B transfer; HIGH enables B→A transfer. |
| 2–9 | A0–A7 | Port A data I/O lines - connect to source bus (e.g., microcontroller data bus). |
| 10 | GND | Ground reference (0 V) - must be connected; thermal pad may remain floating or tied to GND. |
| 11–18 | B0–B7 | Port B data I/O lines - connect to destination bus (e.g., peripheral or memory interface). |
| 19 | OE | Active-low output enable: LOW enables transceiver; HIGH forces all A/B pins into high-impedance state. |
| 20 | VCC | Positive supply (4.5–5.5 V) - decoupling capacitor required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min / VIL = 0.8 V max ensures direct interoperability with 5 V microcontrollers, FPGAs, and legacy logic without level shifters. |
| Overvoltage-tolerant I/O | Withstands up to 5.5 V on any input regardless of VCC - enables safe use in mixed-supply systems (e.g., 3.3 V core ↔ 5 V peripheral). |
| Thermally enhanced QFN | DHVQFN20 package with 0.85 mm profile and exposed pad improves power dissipation efficiency vs. SO20/TSSOP, supporting sustained 5 V operation at full temperature range. |
| High noise immunity | Schmitt-trigger inputs provide hysteresis (typ. 0.5 V), rejecting fast transients and ensuring stable logic sampling in electrically noisy industrial environments. |
| 3-state bus isolation | Simultaneous high-Z control via single OE pin allows clean bus arbitration and prevents contention in multi-master or shared-data-path architectures. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Extension |
|---|---|
|
Use Scenario: Interfacing a modern 3.3 V ARM Cortex-M7 MCU to a legacy 5 V parallel I/O expansion module in programmable logic controller rack systems. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing data flow between mismatched voltage domains while maintaining strict timing integrity under EMI stress. Use Value: Eliminates need for discrete level-shifting circuitry; guarantees <10 ns propagation delay and robust 2 kV HBM ESD tolerance in factory-floor environments. |
Use Scenario: Extending the 8-bit data bus of an aging 8051-based motor control board to add external SRAM and GPIO expanders without redesigning the core PCB. IC Role / Device Role / Timing Role: 3-state bus repeater enabling dynamic bus sharing between CPU, memory, and peripherals via OE-controlled arbitration. Use Value: Provides precise timing control (tdis ≤ 12.5 ns) and TTL-compatible inputs that match original 8051 output specs, preserving system timing margins. |
| Automated Test Equipment (ATE) Signal Routing | Embedded Instrumentation Data Acquisition |
|
Use Scenario: Routing parallel digital test patterns between FPGA pattern generators and DUT interface boards in modular ATE platforms with mixed 3.3 V/5 V subsystems. IC Role / Device Role / Timing Role: Directionally configurable bus switch enabling flexible signal path reconfiguration under software control (DIR/OE). Use Value: Supports sub-10 ns edge alignment across 16 lines, critical for synchronized stimulus/response capture in high-speed digital test vectors. |
Use Scenario: Isolating sensor ADC output buses from host processor buses in compact environmental monitoring nodes where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Low-power 3-state buffer providing galvanic separation and bus contention prevention during sleep/wake transitions. Use Value: Delivers <4 μA ICC standby current at 5 V and DHVQFN20's 0.85 mm height - essential for ultra-thin, fanless enclosure designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT245PW,118 | TSSOP20 package (4.4 mm width); slightly higher thermal resistance (10.0 mW/K derating above 100 °C) vs. DHVQFN20's 12.9 mW/K above 111 °C. | Preferred for hand-soldering or prototyping due to gull-wing leads; less suitable for high-power density or thermally constrained layouts. | Select when leaded package simplifies assembly or rework is anticipated; verify thermal margin in continuous 5 V operation. |
| SN74AHCT245PWR | Texas Instruments variant; identical electrical specs but different pinout (OE on pin 1, DIR on pin 19) and JEDEC-compliant TSSOP20 footprint. | Drop-in replacement only if board layout accommodates TI's pin assignment; not mechanically interchangeable with Nexperia DHVQFN20. | Choose only if sourcing flexibility across vendors is required and PCB layout supports TI's pin mapping - not a physical substitute for 74AHCT245BQ,115. |
Compared with 74AHCT245PW,118 and SN74AHCT245PWR, the 74AHCT245BQ,115 offers superior thermal performance in space-constrained industrial modules, native pin compatibility with Nexperia's QFN ecosystem, and guaranteed overvoltage tolerance without requiring layout changes for mixed-voltage routing.
Availability
74AHCT245BQ,115 is available at Aetrix Electronics and suitable for industrial automation backplanes, embedded instrumentation data paths, automated test equipment signal routing, and legacy microcontroller bus extension requiring stable component supply across extended temperature ranges.
Supply support for 74AHCT245BQ,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 for automotive, industrial, and consumer markets.
The 74AHCT245BQ,115 belongs to Nexperia's AHC/AHCT logic family, engineered specifically for robust, low-power, mixed-voltage bus interfacing in harsh industrial environments with extended temperature and ESD requirements.
FAQ
What is the maximum clock/data rate supported by the 74AHCT245BQ,115?
The 74AHCT245BQ,115 does not operate on a clock; it is an asynchronous transceiver. Its usable data rate depends on propagation delay (≤10.0 ns at 5 V/50 pF) and system setup/hold timing. For clean 50% duty-cycle signals, this supports reliable parallel bus operation up to approximately 50 MHz in well-terminated, low-noise layouts.
Can the 74AHCT245BQ,115 safely interface a 3.3 V microcontroller with a 5 V peripheral?
Yes - its inputs tolerate up to 5.5 V regardless of VCC, and its TTL-compatible thresholds (VIH = 2.0 V min) accept 3.3 V logic HIGH levels directly. When powered at 5 V, it drives 5 V outputs compatible with standard 5 V peripherals, enabling true bidirectional level translation without external components.
Is the exposed thermal pad on the DHVQFN20 package required to be soldered to ground?
No - per Nexperia's datasheet (SOT764-1), the thermal pad has no electrical requirement. It may remain unsoldered, float electrically, or be connected to GND. If soldered, the land must be isolated from other nets unless explicitly tied to GND; no thermal or electrical penalty occurs if left unconnected.
How does the 74AHCT245BQ,115 differ from the 74AHC245BQ variant?
The 74AHCT245BQ uses TTL input thresholds (VIH = 2.0 V, VIL = 0.8 V), making it compatible with 5 V microcontrollers and legacy logic. The 74AHC245BQ uses CMOS thresholds (VIH ≈ 0.7×VCC), requiring ≥3.15 V for reliable HIGH detection at 5 V - limiting interoperability with marginal or noisy 5 V sources.
74AHCT245BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74AHCT245BQ,115 FAQ
1.How can I place an order for 74AHCT245BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT245BQ,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 74AHCT245BQ,115 reliable?
The price and inventory of 74AHCT245BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT245BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHCT245BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT245BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT245BQ,115?
74AHCT245BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT245BQ,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 74AHCT245BQ,115?
For technical support, including 74AHCT245BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT245BQ,115 requirements.
6.How does Aetrix verify that 74AHCT245BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHCT245BQ,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 74AHCT245BQ,115 meets industry standards.
7.What is the process for return or replacement of 74AHCT245BQ,115?
All 74AHCT245BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT245BQ,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 74AHCT245BQ,115 part is unused and in its original packaging.
Return procedure for 74AHCT245BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AHCT245BQ,115 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
