My Inquiry
My Account
Nexperia USA Inc. 74HCT245D,653
- Part No.:
- 74HCT245D,653
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT245D,653.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,584
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74HCT245D,653 from Nexperia is an octal 3-state bidirectional bus transceiver with TTL-compatible inputs, 20-pin SO20 package, -40 °C to +125 °C operating range, and propagation delay of 12–33 ns at VCC = 4.5–5.5 V - used for level-shifting and bus isolation in industrial microcontroller peripheral interfaces.
For engineers reviewing the 74HCT245D,653 datasheet, 74HCT245D,653 pinout, 74HCT245D,653 application, or 74HCT245D,653 equivalent, this device supports high-noise-immunity data routing between mismatched logic families, requires precise OE/DIR timing control, and demands verification of input clamping diode usage when interfacing to voltages exceeding VCC.
Technical Context
The 74HCT245D,653 implements non-inverting bidirectional data flow controlled by DIR (direction) and OE (output enable) pins: DIR selects A→B or B→A path, while active-low OE places all outputs in high-impedance state. It uses standard CMOS silicon with TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), enabling direct connection to legacy 5 V TTL systems without level shifters.
Its static drive capability delivers VOH ≥ 3.98 V and VOL ≤ 0.26 V at IO = ±6 mA, and dynamic performance includes 12 ns typical propagation delay (An↔Bn), 16 ns enable/disable times, and 5–12 ns output transition times - all specified across full industrial temperature range with 15 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible input thresholds, CMOS output drive, 4.5–5.5 V supply |
| Bus Width | 8-bit bidirectional - supports simultaneous transfer of byte-wide parallel data |
| Propagation Delay | 12 ns (typ) An↔Bn at VCC = 4.5 V, CL = 15 pF - enables >30 MHz bus operation |
| Output Drive | ±6 mA at VOH/VOL specs - sufficient to drive 10 LSTTL loads or 15 pF PCB traces |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-range embedded control |
| ESD Protection | HBM >2000 V, CDM >1000 V - robust handling in automated assembly and field service |
| Power Dissipation | 500 mW max (SO20) - derates linearly above 109 °C ambient; enables passive thermal design |
Pinout & Package
74HCT245D,653 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW = A→B data flow; HIGH = B→A; must be stable before OE activation |
| 2–9 (A0–A7) | Port A I/O terminals | Bidirectional data lines connected to microcontroller or CPU bus side |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and I/O; decoupling capacitor required |
| 11–18 (B0–B7) | Port B I/O terminals | Bidirectional data lines connected to peripheral or memory bus side |
| 19 (OE) | Active-low output enable | LOW = outputs enabled; HIGH = all outputs high-Z; asynchronous control |
| 20 (VCC) | Positive supply | 4.5–5.5 V nominal; bypass with 100 nF ceramic near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V - eliminates need for external level translators when interfacing 5 V TTL peripherals |
| Input clamp diodes | Enables use of current-limiting resistors for safe interface to signals up to VCC + 0.5 V - protects against overvoltage on A/B ports during hot-swap or fault conditions |
| High noise immunity | Typical noise margin >1.2 V at VCC = 5 V - ensures reliable operation in electrically noisy industrial environments with EFT/burst coupling |
| 3-state output control | Asynchronous OE with 16 ns max enable/disable time - allows precise bus arbitration timing in multi-master systems |
| Wide temperature range | Specified from -40 °C to +125 °C - validated for use in motor drives, PLC I/O modules, and outdoor telecom equipment |
Applications
| Industrial PLC Backplane Interface | Microcontroller Peripheral Expansion |
|---|---|
|
Use Scenario: Isolating and buffering 8-bit data between a 3.3 V ARM Cortex-M MCU and legacy 5 V parallel EEPROM or LCD controller on a modular I/O rack. IC Role / Device Role / Timing Role: Bidirectional level translator and bus driver; DIR set statically, OE toggled per transaction to prevent bus contention. Use Value: Eliminates discrete level-shifter ICs and reduces BOM count; 12 ns propagation delay supports 25 MHz burst reads without wait states. |
Use Scenario: Enabling shared access to a common 8-bit sensor bus among multiple MCUs in a distributed environmental monitoring node. IC Role / Device Role / Timing Role: Bus arbitrator and direction manager; OE controlled by master MCU, DIR synchronized to data flow direction. Use Value: Prevents signal contention during multi-node polling; high-impedance OFF-state (<±0.5 μA leakage) ensures zero standby current draw on idle segments. |
| Automated Test Equipment (ATE) Signal Routing | Legacy Industrial Display Interface |
|
Use Scenario: Routing configurable 8-bit digital stimulus/response signals between FPGA pattern generator and DUT socket in benchtop ATE. IC Role / Device Role / Timing Role: Reconfigurable bus switch; DIR and OE driven by FPGA GPIO for per-cycle direction and enable control. Use Value: Supports sub-20 ns timing margins required for 50 MHz digital vector testing; input clamping diodes tolerate ±0.3 V overshoot on test fixture cables. |
Use Scenario: Interfacing a modern 3.3 V SoC video processor to a 5 V parallel RGB TFT display module with integrated timing controller. IC Role / Device Role / Timing Role: Unidirectional data repeater (A→B only); DIR held LOW, OE synchronized to pixel clock enable. Use Value: Maintains signal integrity over 10 cm flex cable runs; 6 mA drive strength sustains <0.4 V VOL at 50 pF load, meeting display setup/hold timing. |
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 |
|---|---|---|---|
| SN74HCT245N | Dual in-line package (PDIP-20); higher thermal resistance (θJA = 70 °C/W vs. 58 °C/W for SO20); no exposed pad | Suitable for prototyping and through-hole PCBs; not recommended for high-density or thermally constrained layouts | Select when manual soldering or breadboard validation is required; avoid in production boards with >1 W power dissipation |
| 74LVC245APW | Lower voltage operation (1.65–3.6 V); CMOS inputs; 3.3 V optimized; 3.5 ns typical tpd at VCC = 3.3 V | Designed for 3.3 V-only systems; lacks TTL input compatibility; unsuitable for 5 V legacy interface | Choose for new 3.3 V designs requiring faster speed and lower power; not a drop-in replacement for 5 V mixed-voltage buses |
Compared with SN74HCT245N and 74LVC245APW, the 74HCT245D,653 uniquely balances TTL input compatibility, SO20 thermal performance, and industrial temperature rating - making it optimal for retrofitting 5 V peripherals into modern embedded controllers without redesigning voltage domains.
Availability
74HCT245D,653 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller peripheral expansion, automated test equipment signal routing, and legacy display interfaces requiring stable component supply across extended temperature ranges.
Supply support for 74HCT245D,653 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, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT245D,653 belongs to Nexperia's 74HCT logic family - engineered for robust interoperability between TTL and CMOS systems in harsh industrial environments, with emphasis on noise immunity, wide temperature operation, and long-term supply stability.
FAQ
Can 74HCT245D,653 operate at 3.3 V supply?
No - the 74HCT245D,653 is specified only for 4.5–5.5 V operation per JEDEC JESD8C. At 3.3 V, VIH and VOL specifications are not guaranteed, and input thresholds fall outside TTL compatibility range. Use 74LVC245 for 3.3 V systems.
What is the maximum capacitive load supported on A/B ports?
The device is characterized up to 50 pF load capacitance (per Table 9), with 15 pF used for timing measurements. Driving >50 pF may increase propagation delay beyond 33 ns and degrade edge rates; add series termination or buffer stages for heavier loads.
How should unused inputs be handled?
All unused A/B port pins must be tied to VCC or GND - floating inputs cause increased ICC and potential oscillation due to CMOS input stage metastability. DIR and OE must also be actively driven; never leave OE floating, as it defaults to HIGH (outputs disabled).
Does 74HCT245D,653 support hot-swap insertion?
It supports limited hot-swap via input clamp diodes, but only when external current-limiting resistors are used per pin (≥1 kΩ) for signals exceeding VCC + 0.5 V. Full hot-swap compliance requires additional protection circuitry - the device itself is not hot-swap rated per IEC 61000-4-2.
74HCT245D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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-SO
74HCT245D,653 FAQ
1.How can I place an order for 74HCT245D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245D,653 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,653 reliable?
The price and inventory of 74HCT245D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245D,653 is usually 5 days.
3.What payment methods are accepted for 74HCT245D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245D,653?
74HCT245D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245D,653 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,653?
For technical support, including 74HCT245D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245D,653 requirements.
6.How does Aetrix verify that 74HCT245D,653 is sourced from the original manufacturer or authorized distributors?
All 74HCT245D,653 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,653 meets industry standards.
7.What is the process for return or replacement of 74HCT245D,653?
All 74HCT245D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245D,653, 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,653 part is unused and in its original packaging.
Return procedure for 74HCT245D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT245D,653 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…
