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Nexperia USA Inc. 74HCT245BQ,115
- Part No.:
- 74HCT245BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74HCT245BQ,115.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,877
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Product details
Overview
74HCT245BQ,115 from Nexperia is an octal 3-state bidirectional bus transceiver with TTL-compatible input thresholds, 20-terminal DHVQFN package, -40 °C to +125 °C operating range, and propagation delay of 10 ns (typ) at VCC = 5.0 V. It enables data flow control between two 8-bit buses in microcontroller peripheral expansion, memory interface buffering, and industrial I/O subsystems.
For engineers reviewing the 74HCT245BQ,115 datasheet, 74HCT245BQ,115 pinout, 74HCT245BQ,115 application, or 74HCT245BQ,115 equivalent, this device delivers precise bidirectional level translation with active-low output enable (OE), direction control (DIR), and robust ESD protection (HBM >2000 V) for noise-immune digital interconnect design.
Technical Context
The 74HCT245BQ implements non-inverting 3-state logic with separate DIR and OE inputs: DIR selects data path direction (A→B or B→A), while OE (active LOW) places all outputs in high-impedance state. Its TTL-level inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.0 V) ensure compatibility with legacy 5 V logic families.
Dynamic performance is defined by propagation delay (tpd = 10–33 ns), enable/disable times (ten/tdis = 16–45 ns), and transition time (tt = 5–18 ns), all specified across full temperature and voltage ranges. Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in standard 5 V digital systems with ±5% tolerance. |
| Propagation Delay | 10 ns (typ) at VCC = 5.0 V, CL = 15 pF - Enables reliable timing in high-speed 8-bit bus transfers up to ~50 MHz. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees clean recognition of TTL logic levels without external level shifters. |
| Output Drive | ±6 mA at VCC = 4.5 V - Sufficient to drive 10 LSTTL loads or 15 pF capacitive bus loads with controlled edge rates. |
| Operating Temperature | -40 °C to +125 °C - Qualified for industrial and extended-temperature embedded applications including motor control and PLC modules. |
| ESD Protection | HBM >2000 V, CDM >1000 V - Provides robust handling integrity during PCB assembly and field service. |
| Power Dissipation | 500 mW (max) at Tamb ≤ 111 °C - Supports thermal management in dense QFN layouts with derating above junction temperature threshold. |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal leadless construction with exposed thermal pad (GND-connected per layout guidance), no leads, and terminal 1 index area marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | LOW enables A→B data flow; HIGH enables B→A - critical for bidirectional bus arbitration in shared-memory architectures. |
| 2–9 (A0–A7) | Port A Data I/O | 8-bit bidirectional data port connected to master-side bus (e.g., MCU data bus); clamped inputs tolerate overvoltage. |
| 10 (GND) | Ground Reference | Primary 0 V reference for logic and power; thermal pad must be soldered to PCB ground plane for thermal and EMI performance. |
| 11–18 (B0–B7) | Port B Data I/O | 8-bit bidirectional data port connected to slave-side bus (e.g., peripheral or memory); electrically identical to Port A. |
| 19 (OE) | Output Enable (Active LOW) | Drives all 16 outputs into high-Z state when HIGH - essential for bus contention avoidance in multi-master systems. |
| 20 (VCC) | Supply Voltage | +4.5 V to +5.5 V supply rail; requires local 100 nF ceramic decoupling adjacent to terminal 20. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH/VIL thresholds match legacy 5 V TTL families - eliminates need for external level translators in mixed-logic designs. |
| Thermally Enhanced QFN | DHVQFN20 package with exposed thermal pad reduces θJA to ~45 °C/W - enables sustained 8-bit bus throughput in compact industrial controllers. |
| High-Noise Immunity | Typical noise margin >1.2 V at VCC = 5.0 V - maintains signal integrity in electrically noisy environments like factory automation. |
| 3-State Output Control | Independent OE and DIR pins allow simultaneous bus isolation and direction reversal - supports dynamic reconfiguration of data paths. |
| Wide Operating Range | Specified from -40 °C to +125 °C - validated for under-hood automotive ECUs and outdoor telecom equipment without derating. |
Applications
| Microcontroller Peripheral Expansion | Industrial I/O Module Interface |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 16-bit parallel LCD, keypad matrix, and sensor array. IC Role / Device Role / Timing Role: Bidirectional data bridge between MCU's 8-bit data bus and external peripherals, with DIR toggled per transaction and OE asserted during bus arbitration. Use Value: Eliminates need for discrete logic or FPGA glue logic; 10 ns tpd ensures pixel clock alignment in 60 Hz VGA timing-critical displays. |
Use Scenario: Isolating programmable logic controller (PLC) CPU bus from modular analog/digital I/O cards in a DIN-rail mounted chassis. IC Role / Device Role / Timing Role: Bus buffer with OE synchronized to backplane slot enable signals, preventing contention during hot-swap insertion/removal. Use Value: 2000 V HBM ESD rating protects against field-induced discharge during maintenance; -40 °C to +125 °C rating ensures reliability in uncooled enclosures. |
| Memory Interface Buffering | Legacy System Bus Interfacing |
Use Scenario: Interfacing an 8-bit microprocessor (e.g., Z80) to external SRAM or EPROM using a shared address/data bus. IC Role / Device Role / Timing Role: Transceiver managing multiplexed AD0–AD7 lines, with DIR set for address latching and OE disabled only during read/write cycles. Use Value: 3-state outputs prevent bus conflicts during WAIT state generation; 0.4 V VOL at 6 mA ensures solid LOW recognition by memory devices. |
Use Scenario: Connecting modern 3.3 V FPGA I/O banks to legacy 5 V ISA bus peripherals in test equipment retrofit. IC Role / Device Role / Timing Role: Level-translating bus driver with TTL input thresholds accepting 5 V signals, while sourcing/sinking 6 mA into 5 V loads. Use Value: No external pull-ups or voltage translators required; VIH = 2.0 V min guarantees reliable detection of 5 V logic HIGH from ISA slots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245PW,118 | TSSOP20 package (4.4 mm width); 100 °C max junction temp before derating; 10 mW/K thermal derating slope. | Better suited for hand-soldered prototyping and low-volume board repair due to gull-wing leads. | Select when manual assembly, optical inspection, or rework capability is prioritized over thermal density. |
| SN74HCT245PWR | Texas Instruments part; identical logic function but different AC specs: tpd = 19 ns (max) vs. Nexperia's 33 ns (max) at same conditions. | Valid for cost-sensitive consumer electronics where 10 ns timing margin is not required. | Choose only if TI's qualification documentation meets your system's timing slack analysis and long-term supply commitments. |
Compared with 74HCT245PW,118, the 74HCT245BQ,115 offers superior thermal performance in space-constrained layouts; versus SN74HCT245PWR, it provides tighter propagation delay distribution and higher ESD robustness-critical for industrial field deployments.
Availability
74HCT245BQ,115 is available at Aetrix Electronics and suitable for industrial I/O modules, microcontroller peripheral expansion, and memory interface buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT245BQ,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, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The 74HCT245BQ belongs to Nexperia's 74HCT logic family-designed specifically for robust 5 V TTL-compatible interfacing in harsh-environment embedded systems where noise immunity and thermal resilience are mandatory.
FAQ
Can the 74HCT245BQ,115 operate at 3.3 V supply?
No. The 74HCT245BQ,115 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. At 3.3 V, VIH minimum (2.0 V) would exceed 60% of VCC, violating TTL input threshold compliance and risking unreliable logic recognition. Use 74LVC245 for 3.3 V systems.
Is the exposed thermal pad on the DHVQFN20 package electrically connected?
Yes. The exposed pad (terminal 1 index area) is internally connected to GND and must be soldered to a PCB copper pour tied to the system ground plane. Per Nexperia's layout guidelines, this connection is mandatory for thermal dissipation and EMI suppression-not optional.
What is the maximum capacitive load the 74HCT245BQ,115 can drive reliably?
The device is characterized up to 50 pF load capacitance (per Table 9 test data), with guaranteed 18 ns max transition time (tt) and 33 ns max propagation delay (tpd) at CL = 50 pF. Driving >50 pF risks timing violations and increased ground bounce; add series termination or buffer stages beyond this limit.
Does OE need to be debounced in mechanical switch applications?
Yes. Mechanical switches asserting OE directly introduce bounce that may cause momentary bus contention or metastable states. A 100 nF capacitor to GND at the OE input, combined with a 10 kΩ pull-up, provides sufficient RC filtering (τ ≈ 1 μs) to suppress bounce while preserving valid enable timing per the 16 ns min ten spec.
74HCT245BQ,115 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74HCT245BQ,115 FAQ
1.How can I place an order for 74HCT245BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245BQ,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 74HCT245BQ,115 reliable?
The price and inventory of 74HCT245BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT245BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245BQ,115?
74HCT245BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245BQ,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 74HCT245BQ,115?
For technical support, including 74HCT245BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245BQ,115 requirements.
6.How does Aetrix verify that 74HCT245BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT245BQ,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 74HCT245BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT245BQ,115?
All 74HCT245BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245BQ,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 74HCT245BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT245BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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