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NXP Semiconductors 74HCT42D,653
- Part No.:
- 74HCT42D,653
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT42D,653.pdf
- Description:
- IC DECODER 1 X 4:10 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,473
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Product details
Overview
74HCT42D,653 from Nexperia is a BCD-to-decimal decoder (1-of-10) IC with four CMOS-compatible inputs (0A–3A) and ten mutually exclusive active-low outputs (0Y–9Y), operating across 4.5 V to 5.5 V supply range, delivering propagation delay as low as 14 ns at VCC = 6.0 V, and rated for -40 °C to +125 °C ambient temperature - used in address decoding for 7-segment displays and industrial control logic panels.
For engineers reviewing the 74HCT42D,653 datasheet, 74HCT42D,653 pinout, 74HCT42D,653 application, or 74HCT42D,653 equivalent, key selection criteria include its TTL-compatible input thresholds, guaranteed output disable for invalid BCD codes (>9), SO16 package footprint compatibility, and demultiplexing capability using 3A as data input.
Technical Context
The 74HCT42D,653 implements combinational logic that decodes binary-coded decimal inputs into one of ten active-low decimal outputs; all outputs go HIGH for input codes 10–15, ensuring fail-safe behavior in invalid-state conditions. Its TTL-compatible input structure accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5 V, enabling direct interfacing with legacy 5 V TTL systems without level-shifting.
Propagation delays are characterized across temperature and voltage: tPD = 14–38 ns (VCC = 6.0 V, -40 °C to +125 °C), with transition times (tt) under 19 ns. The device supports 1-of-8 demultiplexing when 3A is used as data input and 0A–2A as select lines, leveraging inherent inhibit functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-signal systems |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5 V - enables direct connection to 5 V TTL outputs without translation |
| Propagation Delay | 14 ns (typ) at VCC = 6.0 V - supports timing-critical decoding in high-speed control logic |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules and industrial PLC backplanes |
| Output Drive | ±4.0 mA at VCC = 4.5 V - sufficient to directly drive LED segments or interface with subsequent CMOS/TTL stages |
| Invalid Code Response | All outputs HIGH for input codes 10–15 - prevents erroneous activation in BCD overflow or noise-induced glitches |
| Power Dissipation | CPD = 37 pF - enables accurate dynamic power estimation in battery-sensitive applications |
Pinout & Package
74HCT42D,653 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width - compatible with standard SOIC-16 footprints and reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9, 10, 11 | 0Y–9Y | Active-low decimal outputs - each asserts LOW for one valid BCD input (0–9); all HIGH otherwise |
| 12, 13, 14, 15 | 0A, 1A, 2A, 3A | BCD input bits (LSB to MSB) - 3A serves dual role as enable/inhibit or demux data input |
| 8 | GND | Ground reference - must be connected to system 0 V plane with low-inductance path |
| 16 | VCC | Positive supply - requires local 100 nF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels without external biasing or level shifters |
| Mutually exclusive outputs | Only one output active LOW per valid BCD code - eliminates bus contention in decoder trees |
| Invalid-code suppression | Guarantees all outputs HIGH for inputs >9 - critical for fault-tolerant display and safety interlock logic |
| 1-of-8 demultiplexing mode | Uses 0A–2A as address lines and 3A as data input - reduces component count in serial-to-parallel conversion |
| ESD robustness | HBM >2000 V, CDM >1000 V - withstands handling and board-level ESD events in automated assembly |
Applications
| Industrial Control Panel Decoding | 7-Segment Display Driver Interface |
|---|---|
Use Scenario: Mapping microcontroller GPIO outputs to discrete relay or indicator lamp selection in factory HMIs. IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing one-hot enable signals for up to ten independent loads. Use Value: Eliminates software-based lookup tables and reduces MCU I/O usage by offloading combinatorial decoding to hardware with sub-20 ns latency. |
Use Scenario: Driving common-anode 7-segment displays via segment driver transistors in test equipment front panels. IC Role / Device Role / Timing Role: Active-low decimal output generator synchronized to BCD data updates from controller. Use Value: Ensures glitch-free digit selection during BCD transitions due to simultaneous invalid-code blanking (all outputs HIGH). |
| Automotive HVAC Control Logic | Legacy Instrument Cluster Addressing |
Use Scenario: Selecting temperature setpoint indicators or mode actuators in non-safety-critical cabin control modules. IC Role / Device Role / Timing Role: Fault-mitigating decoder interpreting rotary encoder BCD output for display and actuator enable. Use Value: Built-in invalid-code response prevents unintended actuator activation during encoder misalignment or EMI-induced bit errors. |
Use Scenario: Addressing discrete memory-mapped peripherals (e.g., ADCs, DACs) in older automotive ECUs with limited address bus width. IC Role / Device Role / Timing Role: 1-of-10 address decoder enabling peripheral selection within 4-bit address space. Use Value: Supports deterministic, zero-software-latency peripheral access while maintaining compatibility with legacy 5 V TTL bus timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-decimal decoding applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC42D,653 | CMOS inputs, VCC = 2.0–6.0 V, higher noise immunity | Better suited for mixed-voltage systems and low-power standby modes | Select when supply flexibility or ultra-low ICC (<160 μA) is required |
| SN74LS42N | TTL inputs only, VCC = 4.75–5.25 V, higher ICC, slower tPD (~45 ns) | Requires strict 5 V rail; not suitable for wide-temp or low-power designs | Choose only for legacy board replacements where LS logic family matching is mandatory |
Compared with 74HCT42D,653, the 74HC42D,653 offers wider supply range and lower static current but lacks TTL input compatibility, while SN74LS42N provides identical pinout but demands tighter voltage regulation and delivers inferior speed and thermal performance.
Availability
74HCT42D,653 is available at Aetrix Electronics and suitable for industrial control panel decoding, 7-segment display driver interfaces, and automotive HVAC control logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT42D,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, reliable, and scalable logic, analog, and discrete components for industrial, automotive, and consumer markets.
The 74HCT42D,653 belongs to Nexperia's 74HCT logic family, engineered specifically for seamless interoperability between TTL and CMOS systems in cost-sensitive, thermally demanding applications where input compatibility and robust operation are critical.
FAQ
What is the input voltage compatibility of the 74HCT42D,653?
The 74HCT42D,653 features TTL-compatible inputs: VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5 V. This allows direct interfacing with standard 5 V TTL outputs without level-shifting circuitry. Input clamping diodes permit use with current-limiting resistors for overvoltage protection, and the device operates reliably across its full specified supply range of 4.5 V to 5.5 V.
How does the 74HCT42D,653 handle invalid BCD inputs (10–15)?
The 74HCT42D,653 drives all ten outputs (0Y–9Y) HIGH when input codes exceed decimal 9 - a built-in fail-safe behavior confirmed in its function table. This prevents erroneous activation of downstream loads during BCD overflow, noise injection, or encoder misalignment, making it suitable for safety-conscious industrial and automotive subsystems where undefined states must be actively suppressed.
Can the 74HCT42D,653 be used as a demultiplexer?
Yes, the 74HCT42D,653 supports 1-of-8 demultiplexing: inputs 0A–2A serve as address lines, and input 3A functions as the data input. When used this way, the device routes the 3A signal to one of eight outputs (0Y–7Y), while outputs 8Y and 9Y remain HIGH. This dual-mode capability reduces component count in serial-to-parallel conversion circuits without requiring additional logic gates.
What is the maximum operating temperature rating for the 74HCT42D,653?
The 74HCT42D,653 is qualified for operation from -40 °C to +125 °C, as specified in Nexperia's ordering information for the SO16 package (SOT109-1). This extended temperature range supports deployment in under-hood automotive modules, industrial motor drives, and outdoor-rated control enclosures where ambient thermal stress exceeds commercial-grade limits.
What package type and footprint does the 74HCT42D,653 use?
The 74HCT42D,653 uses the SO16 plastic small outline package (SOT109-1), with 16 leads and 3.9 mm body width. Its pin pitch is 1.27 mm, and it conforms to JEDEC MS-012 standards. This footprint is compatible with standard SOIC-16 land patterns, reflow soldering profiles, and automated optical inspection (AOI) systems used in high-volume PCB assembly.
74HCT42D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HCT42D,653 FAQ
1.How can I place an order for 74HCT42D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT42D,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 74HCT42D,653 reliable?
The price and inventory of 74HCT42D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT42D,653 is usually 5 days.
3.What payment methods are accepted for 74HCT42D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT42D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT42D,653?
74HCT42D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT42D,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 74HCT42D,653?
For technical support, including 74HCT42D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT42D,653 requirements.
6.How does Aetrix verify that 74HCT42D,653 is sourced from the original manufacturer or authorized distributors?
All 74HCT42D,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 74HCT42D,653 meets industry standards.
7.What is the process for return or replacement of 74HCT42D,653?
All 74HCT42D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT42D,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 74HCT42D,653 part is unused and in its original packaging.
Return procedure for 74HCT42D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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