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NXP Semiconductors 74HCT42D,652
- Part No.:
- 74HCT42D,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT42D,652.pdf
- Description:
- IC DECODER 1 X 4:10 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
74HCT42D,652 from Nexperia is a BCD-to-decimal decoder (1-of-10) IC with four CMOS-compatible inputs (0A–3A), ten mutually exclusive active-low outputs (0Y–9Y), 2.0 V to 6.0 V supply range, propagation delay of 14 ns (typ.) at VCC = 6.0 V, and operation over -40 °C to +125 °C. It serves as a logic-level address decoder in industrial control panels requiring discrete output selection.
For engineers reviewing the 74HCT42D,652 datasheet, 74HCT42D,652 pinout, 74HCT42D,652 application, or 74HCT42D,652 equivalent, this page delivers verified functional behavior, SO16 package mapping, static/dynamic electrical specs, real-world demultiplexing use cases, and two validated alternative parts for BCD decoding tasks.
Technical Context
The 74HCT42D,652 implements combinational logic that decodes binary-coded decimal inputs into one-of-ten active-low outputs; all outputs go HIGH for invalid BCD codes (10–15). Its 3A input doubles as an inhibit control for 1-of-8 operation or data input in 8-output demultiplexer mode.
Input clamp diodes enable interface to voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC standard no. 7A and meets JESD 78 Class II Level B latch-up immunity (>100 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.0 V to 6.0 V - supports mixed-voltage system interfacing with TTL/CMOS logic families |
| Propagation delay | 14 ns (typ.) at VCC = 6.0 V - enables reliable timing in 35 MHz+ address decode paths |
| Output drive | ±4.0 mA at VCC = 4.5 V - sufficient to directly drive LED indicators or small-signal logic loads |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-temperature embedded systems |
| Input threshold | VIL ≤ 1.8 V, VIH ≥ 4.2 V at VCC = 6.0 V - ensures robust noise margin against TTL-level signals |
| Power dissipation | CPD = 37 pF - allows accurate dynamic power estimation in clocked applications |
Pinout & Package
74HCT42D,652 is housed in a plastic small outline package (SO16), SOT109-1 variant, with 16 leads, 3.9 mm body width, and gull-wing surface-mount terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 7, 9–11 | 0Y–9Y | Active-low decoded outputs; each asserts LOW for its corresponding BCD input (0–9) |
| 12–15 | 0A–3A | BCD data inputs; 3A serves dual role as inhibit/data select in demux mode |
| 8 | GND | Ground reference for all internal logic and I/O; must be low-impedance connection |
| 16 | VCC | Positive supply rail; decoupling capacitor required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Mutually exclusive outputs | Only one Y output is LOW per valid BCD input; prevents bus contention in discrete load switching |
| Invalid code handling | All outputs HIGH for input codes >9 - eliminates false activation in noisy or misaligned BCD streams |
| Clamp diode protection | Enables safe interface to 5 V or 12 V control signals using external series resistors without level shifters |
| 1-of-8 demux capability | 3A input repurposed as data line while 0A–2A act as address lines - reduces component count in simple routing designs |
Applications
| Industrial Control Panel | LED Segment Driver Interface |
|---|---|
Use Scenario: Selecting individual indicator lamps on a factory HMI panel based on 4-bit status register output. IC Role / Device Role / Timing Role: BCD decoder translating microcontroller GPIO outputs into discrete lamp-enable signals. Use Value: Eliminates need for software-based bit-banging or additional logic gates; provides deterministic, glitch-free output activation. |
Use Scenario: Driving common-cathode 7-segment display digits where only one digit is lit at a time via multiplexing. IC Role / Device Role / Timing Role: Output selector enabling one digit position per BCD cycle in time-multiplexed displays. Use Value: Provides precise, low-propagation-delay output enable with built-in invalid-code suppression to prevent ghosting. |
| Test Equipment Address Decoder | Legacy System Bus Expansion |
Use Scenario: Decoding front-panel rotary switch positions (0–9) into dedicated test signal path enables in bench instrumentation. IC Role / Device Role / Timing Role: Hardware-based address resolution for analog switch matrix control lines. Use Value: Delivers sub-20 ns response to mechanical switch bounce, ensuring clean path selection without firmware latency. |
Use Scenario: Adding peripheral slots to vintage 8-bit microprocessor systems using parallel address bus bits A0–A3. IC Role / Device Role / Timing Role: Legacy bus decoder generating chip-select signals for up to ten expansion modules. Use Value: Maintains compatibility with TTL-level buses while offering CMOS power efficiency and thermal stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD decoding applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC42D,653 | Same pinout and function but rated for -40 °C to +85 °C only; lower max operating temperature | Suitable for commercial-grade equipment without extended thermal requirements | Select when cost sensitivity outweighs industrial temperature needs and board space permits same SO16 footprint |
| SN74LS42N | Bipolar TTL technology; 4.75 V to 5.25 V supply only; higher ICC (8 mA typical); slower propagation (45 ns typ.) | Compatible with legacy 5 V TTL systems but incompatible with mixed-voltage or low-power designs | Choose only for direct replacement in existing LS-based boards where power budget and voltage rails are fixed |
Compared with 74HCT42D,652, the 74HC42D,653 trades extended temperature support for lower cost in commercial environments, while SN74LS42N offers TTL compatibility at the expense of speed, power, and supply flexibility - making 74HCT42D,652 the optimal choice for new industrial designs needing robustness and voltage agility.
Availability
74HCT42D,652 is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, LED multiplexing systems, and legacy bus expansion requiring stable component supply across extended temperature ranges.
Supply support for 74HCT42D,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 delivering high-performance logic, analog, and MOSFET solutions with emphasis on reliability, efficiency, and automotive-grade quality.
The 74HCT42D,652 belongs to Nexperia's 74HCT logic family, engineered for TTL-compatible input thresholds and CMOS power efficiency in industrial and embedded control applications.
FAQ
What is the logic polarity of the outputs on the 74HCT42D,652?
The 74HCT42D,652 features active-low outputs (0Y–9Y): each output goes LOW when its corresponding BCD input (0–9) is present, and all outputs are HIGH for invalid codes (10–15). This polarity simplifies direct connection to common-cathode LEDs or N-channel load switches without inversion logic.
Does the 74HCT42D,652 support 3.3 V operation?
Yes, the 74HCT42D,652 operates across 2.0 V to 6.0 V, including 3.3 V nominal supplies. At VCC = 3.3 V, VIH is guaranteed ≥ 2.0 V and VIL ≤ 1.0 V, providing solid noise margins when interfacing with 3.3 V microcontrollers or FPGAs.
Can the 74HCT42D,652 be used as a 1-of-8 demultiplexer?
Yes - by holding input 3A constant (e.g., HIGH), the 74HCT42D,652 functions as a 1-of-8 decoder with inputs 0A–2A selecting outputs 0Y–7Y. Alternatively, applying data to 3A while using 0A–2A as address lines configures it as an 8-output demultiplexer.
What is the maximum output sink current for the 74HCT42D,652?
The 74HCT42D,652 guarantees ±4.0 mA output drive at VCC = 4.5 V and ±5.2 mA at VCC = 6.0 V. For continuous operation, limit steady-state sink current per output to ≤4 mA to maintain VOL ≤ 0.26 V and avoid thermal derating above 110 °C.
Is the 74HCT42D,652 pin-compatible with the 74HC42D?
No - while both share identical pinout (SOT109-1, SO16), the 74HCT42D,652 uses TTL-compatible input thresholds (VIH ≈ 2.0 V min), whereas the 74HC42D requires CMOS thresholds (VIH ≈ 0.7×VCC). Swapping them may cause logic misreads unless supply voltage and driving source are strictly matched.
74HCT42D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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,652 FAQ
1.How can I place an order for 74HCT42D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT42D,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 74HCT42D,652 reliable?
The price and inventory of 74HCT42D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT42D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT42D,652?
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4.How is shipping managed for 74HCT42D,652?
74HCT42D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT42D,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 74HCT42D,652?
For technical support, including 74HCT42D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT42D,652 requirements.
6.How does Aetrix verify that 74HCT42D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT42D,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 74HCT42D,652 meets industry standards.
7.What is the process for return or replacement of 74HCT42D,652?
All 74HCT42D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT42D,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 74HCT42D,652 part is unused and in its original packaging.
Return procedure for 74HCT42D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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