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Nexperia USA Inc. 74HCT245D,652
- Part No.:
- 74HCT245D,652
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT245D,652.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,158
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Product details
Overview
74HCT245D,652 from Nexperia is an octal 3-state bidirectional bus transceiver with TTL-compatible inputs and non-inverting outputs, operating from 4.5 V to 5.5 V supply, featuring direction control (DIR) and active-low output enable (OE), used for level-shifting and bus isolation in industrial microcontroller peripheral interfaces.
For engineers reviewing the 74HCT245D,652 datasheet, 74HCT245D,652 pinout, 74HCT245D,652 application, or 74HCT245D,652 equivalent, this device supports high-noise-immunity data routing between mismatched logic domains, requires precise OE timing coordination in shared-bus systems, and demands thermal-aware PCB layout due to SO20 package power dissipation limits at +125 °C ambient.
Technical Context
The 74HCT245D,652 implements a dual-rail CMOS/TTL interface architecture: DIR selects signal flow direction (A→B or B→A), while OE independently gates all 16 I/Os into high-impedance state. Its input clamping diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used.
It operates across -40 °C to +125 °C with static VIH/VIL thresholds fixed at 2.0 V/0.8 V (TTL-level), propagation delay of 12–33 ns (VCC = 4.5–5.5 V), and 3-state disable time ≤45 ns - enabling deterministic timing in synchronous bus arbitration schemes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL logic families and stable operation under ±5 % rail tolerance. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable recognition of standard TTL output levels without level translation. |
| Propagation Delay | 12 ns typ @ VCC = 4.5 V, CL = 15 pF - enables ≤41.7 MHz bus clocking in point-to-point configurations. |
| 3-State Enable/Disable | ten = 16 ns typ, tdis = 16 ns typ - supports sub-62.5 MHz bus turnaround in half-duplex protocols. |
| Output Drive | ±6 mA @ VOH/VOL - sufficient to drive 10 LSTTL loads or 15 pF capacitive bus stubs without signal degradation. |
| Power Dissipation | 500 mW max (SO20, Tamb ≤ 109 °C) - requires thermal derating above 109 °C at 12.3 mW/K for continuous operation at +125 °C. |
| ESD Robustness | HBM > 2000 V, CDM > 1000 V - reduces risk of field failure during manual handling and board assembly. |
Pinout & Package
74HCT245D,652 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH routes data from A-side to B-side; LOW routes from B-side to A-side. |
| 2–9 | A0–A7 | Port A bidirectional data terminals - connect to microcontroller or ASIC data bus. |
| 10 | GND | Ground reference for all internal circuitry and I/O voltage levels. |
| 11–18 | B0–B7 | Port B bidirectional data terminals - connect to memory, peripheral, or external bus segment. |
| 19 | OE | Active-low output enable: LOW enables transceiver; HIGH forces all A/B pins into high-impedance state. |
| 20 | VCC | Positive supply rail: must be decoupled locally with ≥100 nF ceramic capacitor near pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts standard 5 V TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) without external biasing or level shifters. |
| Clamped Input Protection | Integrated clamp diodes allow safe connection to signals up to VCC + 0.5 V using series current-limiting resistors. |
| Wide Temperature Range | Specified from -40 °C to +125 °C - suitable for under-hood automotive ECUs and industrial motor drives. |
| Low Static Current | ICC ≤ 8 μA typ @ VCC = 5.5 V - minimizes quiescent power in battery-backed or low-power standby modes. |
| JEDEC Compliance | Fully conforms to JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards - ensures interoperability in mixed-voltage systems. |
Applications
| Industrial PLC Backplane Interface | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating CPU data bus from modular I/O cards in programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional bus buffer managing data flow between ARM Cortex-M7 core and isolated CAN/RS-485 modules via DIR-controlled direction switching and OE-gated bus release. Use Value: Enables deterministic bus arbitration with <45 ns disable time, preventing data contention during card insertion/removal sequences. |
Use Scenario: Extending GPIO count of STM32H743 MCU to drive parallel LCD controller and SDIO interface simultaneously. IC Role / Device Role / Timing Role: Level-translating transceiver bridging 3.3 V MCU I/O and 5 V display data bus, with OE synchronized to display frame start pulse. Use Value: Eliminates need for discrete level shifters; TTL input thresholds ensure robust recognition of 3.3 V logic highs even with 100 mV noise margin. |
| Legacy ISA Bus Signal Conditioning | Test Equipment Digital Pattern Generator |
Use Scenario: Replacing obsolete 74LS245 in retro-computing hardware restoration projects requiring 5 V bus integrity. IC Role / Device Role / Timing Role: Pin-compatible upgrade providing identical pinout and function but with lower power, higher noise immunity, and extended temperature range. Use Value: Reduces system power by >80 % vs. LS-TTL while maintaining full backward compatibility with ISA slot timing budgets. |
Use Scenario: Driving multiple DUT inputs from FPGA-based pattern generator with simultaneous enable/disable control per channel group. IC Role / Device Role / Timing Role: Eight-channel bus driver configured as unidirectional repeater (DIR fixed), with OE toggled per test vector to gate stimulus bursts. Use Value: Achieves <16 ns enable skew across all eight outputs, ensuring synchronous edge alignment critical for setup/hold timing validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245PW,118 | TSSOP20 package (4.4 mm width); 10.0 mW/K thermal derating above 100 °C; identical electrical specs. | Better PCB space efficiency and thermal performance in dense layouts; requires finer-pitch reflow profile. | Select for compact designs where SO20 footprint is prohibitive and thermal management allows TSSOP mounting. |
| SN74HCT245PWR | Texas Instruments part; same logic function and pinout; VCC range 4.5–5.5 V; slightly higher ICC (20 μA max). | Validated for TI-specific reference designs; minor differences in transition time (5–12 ns vs. 5–18 ns). | Choose when sourcing from TI distribution channels or integrating with TI MCU ecosystems requiring single-vendor qualification. |
Compared with 74HCT245D,652, the PW variant offers superior thermal density for space-constrained boards, while the SN74HCT245PWR provides alternate supply-chain assurance with minor trade-offs in leakage current and transition consistency - both retain identical functional timing and interface behavior.
Availability
74HCT245D,652 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term obsolescence mitigation, and guaranteed SO20 packaging consistency.
Supply support for 74HCT245D,652 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 specializing in high-performance, energy-efficient logic, analog, and MOSFET solutions, with manufacturing rooted in process innovation and automotive-grade reliability.
The 74HCT245D,652 belongs to Nexperia's industry-standard logic family designed for robust interoperability across mixed-voltage digital systems, emphasizing noise immunity, wide temperature operation, and JEDEC compliance.
FAQ
Can 74HCT245D,652 operate at 3.3 V supply?
No. The 74HCT245D,652 is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible inputs require minimum 2.0 V VIH, which cannot be reliably met below 4.5 V supply due to reduced noise margins and degraded VOL/VOH. For 3.3 V systems, use the 74LVC245 or 74ALVC245 variants instead.
What is the maximum capacitive load the outputs can drive?
The outputs are characterized up to 15 pF load capacitance per pin at 4.5–5.5 V supply, with propagation delay and transition time specifications guaranteed under those conditions. Driving >15 pF increases rise/fall times and may violate setup/hold timing in high-speed buses; add series termination or buffer stages for heavier loads.
Is the GND pad on the SO20 package required to be soldered?
No. The exposed thermal pad (pin 10) is electrically connected to GND internally, but soldering it is optional. If soldered, it must remain floating or be connected to the system ground plane to avoid thermal stress-induced solder joint cracking; unsoldered pads still meet thermal specs up to 109 °C ambient.
How does DIR and OE interact during bus contention scenarios?
When OE is HIGH, all A and B pins enter high-impedance state regardless of DIR value - eliminating contention. DIR only affects signal direction when OE is LOW. This two-level control allows safe bus sharing: OE disables all drivers first, then DIR sets direction before re-enabling, preventing shoot-through or bus conflicts.
74HCT245D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SO
74HCT245D,652 FAQ
1.How can I place an order for 74HCT245D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245D,652 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 74HCT245D,652 reliable?
The price and inventory of 74HCT245D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT245D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245D,652?
74HCT245D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245D,652 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 74HCT245D,652?
For technical support, including 74HCT245D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245D,652 requirements.
6.How does Aetrix verify that 74HCT245D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT245D,652 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 74HCT245D,652 meets industry standards.
7.What is the process for return or replacement of 74HCT245D,652?
All 74HCT245D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245D,652, 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 74HCT245D,652 part is unused and in its original packaging.
Return procedure for 74HCT245D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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