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NXP Semiconductors 74HC42N,652
- Part No.:
- 74HC42N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC42N,652.pdf
- Description:
- IC DECODER 1 X 4:10 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,803
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Product details
Overview
74HC42N,652 from Nexperia is a CMOS BCD-to-decimal decoder (1-of-10) with four binary-coded decimal inputs (0A–3A) and ten mutually exclusive active-HIGH outputs (0Y–9Y), operating across 2.0 V to 6.0 V supply voltage, delivering propagation delay as low as 14 ns at 6.0 V, and rated for -40 °C to +125 °C ambient temperature - used in address decoding, display driver selection, and digital logic routing in industrial control panels.
For engineers reviewing the 74HC42N,652 datasheet, 74HC42N,652 pinout, 74HC42N,652 application, or 74HC42N,652 equivalent, this page delivers verified functional behavior, SO16 package mapping, input clamping diode support for overvoltage-tolerant interfacing, and validated alternatives for BCD decoding in legacy TTL-compatible systems.
Technical Context
The 74HC42N,652 implements combinational logic that decodes 4-bit BCD inputs into exactly one asserted HIGH output among ten Y outputs, with all outputs forced HIGH for invalid codes (10–15). Its design includes input clamp diodes enabling safe interface to voltages exceeding VCC when current-limiting resistors are used.
It supports dual-mode operation: as a standard 1-of-10 decoder or as a 1-of-8 demultiplexer by using 3A as the data input while 0A–2A serve as select lines. The device complies with JEDEC 7A and exhibits latch-up immunity >100 mA per JESD78 Class II Level B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - enables direct compatibility with 3.3 V and 5 V logic systems without level shifting. |
| Propagation Delay (tpd) | 14 ns (max) at VCC = 6.0 V - ensures timing-critical decoding in high-speed digital control subsystems. |
| Output Drive Capability | ±25 mA per output - sufficient to directly drive LED segments or TTL inputs without external buffers. |
| Input Clamp Diodes | Integrated - allows safe interfacing to signals up to VCC + 0.5 V using series current-limiting resistors. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-temperature embedded applications. |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces susceptibility to handling damage during PCB assembly. |
| Power Dissipation | 500 mW max (SO16) - supports continuous operation in compact enclosures with minimal thermal derating. |
Pinout & Package
74HC42N,652 is housed in a plastic small outline package (SO16), SOT109-1 variant, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - compatible with automated surface-mount assembly and reflow profiles per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9, 10, 11 | 0Y–9Y | Mutually exclusive active-HIGH decoded outputs - only one asserts HIGH per valid BCD input. |
| 8 | GND | Ground reference for all internal logic and I/O - must be low-impedance connection to minimize noise coupling. |
| 12, 13, 14, 15 | 0A, 1A, 2A, 3A | BCD input bits (LSB to MSB) - 3A serves dual role as inhibit/demux data input when used in 1-of-8 mode. |
| 16 | VCC | Positive supply rail - requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| 1-of-10 decoding with invalid-code rejection | Outputs 0Y–9Y remain HIGH for input codes 10–15 - prevents spurious activation in error conditions. |
| 1-of-8 demultiplexing capability | 3A input repurposed as data line while 0A–2A act as select lines - eliminates need for separate demux IC. |
| CMOS low power dissipation | ICC ≤ 160 μA at VCC = 6.0 V and 25 °C - enables battery-backed or energy-constrained systems. |
| Wide temperature range operation | Specified from -40 °C to +125 °C - supports deployment in automotive engine compartments and industrial PLCs. |
| Input level compatibility | CMOS-level inputs with VIH ≥ 3.15 V (at VCC = 4.5 V) - ensures robust noise margin against crosstalk and ground bounce. |
Applications
| Industrial Address Decoding | LED Seven-Segment Driver Selection |
|---|---|
|
Use Scenario: Selecting one of ten peripheral registers in a programmable logic controller (PLC) backplane using 4-bit BCD address bus. IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing chip-select signals with guaranteed mutual exclusivity and invalid-code fail-safe behavior. Use Value: Eliminates discrete gate-based decoding logic, reducing component count and board area while ensuring deterministic timing via sub-15 ns propagation delay. |
Use Scenario: Driving common-anode seven-segment displays in multi-digit instrumentation panels where each digit corresponds to a BCD-encoded value. IC Role / Device Role / Timing Role: Output-enable decoder routing BCD input to individual digit drivers, with outputs directly sourcing current to LED anodes. Use Value: Enables direct LED drive without external transistors due to ±25 mA output capability, simplifying display interface design. |
| Legacy System Bus Expansion | Test Equipment Signal Routing |
|
Use Scenario: Expanding address space in retro-computing or test equipment using 8-bit microcontrollers with limited I/O pins. IC Role / Device Role / Timing Role: Translating lower 4 bits of address bus into ten discrete enable lines for memory-mapped peripherals or DIP-switch configuration banks. Use Value: Provides pin-compatible upgrade path from obsolete 74LS42 with identical pinout and improved DC/AC specs at lower power. |
Use Scenario: Routing measurement signals from multiple sensors to a single ADC channel in automated test fixtures. IC Role / Device Role / Timing Role: Demultiplexer selecting one sensor path per BCD command, leveraging 3A as data input and 0A–2A as select lines. Use Value: Reduces system complexity by reusing same IC for both decoding and demux functions - no additional IC required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD decoding applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT42N,652 | CMOS/TTL-input compatible (VIH = 2.0 V min); otherwise identical pinout, function, and timing. | Preferred when interfacing with legacy 5 V TTL outputs without level shifters. | Select 74HCT42N,652 if driving from 74LS or 74F series logic; otherwise retain 74HC42N,652 for pure CMOS systems. |
| SN74LS42N | Bipolar TTL technology; higher ICC (18 mA typical), slower tpd (60 ns), narrower VCC (4.75–5.25 V), and no input clamp diodes. | Only suitable for legacy 5 V-only designs requiring exact TTL fanout and voltage thresholds. | Choose SN74LS42N only for drop-in replacement in existing TTL boards; avoid for new designs due to power and compatibility limitations. |
Compared with 74HC42N,652, the 74HCT42N,652 offers seamless integration with mixed-signal TTL interfaces, while SN74LS42N trades efficiency and flexibility for strict legacy compatibility - making 74HC42N,652 the optimal choice for modern low-power, wide-voltage, and extended-temperature applications.
Availability
74HC42N,652 is available at Aetrix Electronics and suitable for industrial control panels, test equipment signal routing, LED display driver selection, and legacy system bus expansion requiring stable component supply across long production lifecycles.
Supply support for 74HC42N,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 focused on essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer applications.
The 74HC42N,652 belongs to Nexperia's 74HC logic family - designed for low-power, high-noise-immunity digital interfacing in industrial and embedded systems where reliability and wide supply tolerance are critical.
FAQ
What is the maximum supply voltage rating for the 74HC42N,652?
The 74HC42N,652 has an absolute maximum supply voltage (VCC) of +7.0 V, but its recommended operating range is 2.0 V to 6.0 V. Operating above 6.0 V risks violating recommended conditions and may accelerate parametric drift or reduce long-term reliability - always maintain VCC within 2.0 V to 6.0 V for compliant operation of the 74HC42N,652.
Does the 74HC42N,652 support demultiplexing functionality?
Yes, the 74HC42N,652 supports 1-of-8 demultiplexing by using input 3A as the data line and inputs 0A–2A as select lines. This dual-mode capability is explicitly documented in the functional description and eliminates the need for a separate demux IC when implementing 8-channel signal routing - a key feature of the 74HC42N,652.
What happens when invalid BCD codes (10–15) are applied to the 74HC42N,652 inputs?
When binary inputs exceed decimal 9 (i.e., codes 10–15), all ten outputs (0Y–9Y) of the 74HC42N,652 go HIGH simultaneously. This fail-safe behavior prevents unintended activation of downstream circuitry and is inherent to the logic design - confirmed in Table 3 (Function Table) of the 74HC42N,652 datasheet.
Is the 74HC42N,652 pin-compatible with the older 74LS42?
Yes, the 74HC42N,652 shares identical pinout and terminal assignment with the 74LS42, including VCC (pin 16), GND (pin 8), inputs 0A–3A (pins 15,14,13,12), and outputs 0Y–9Y (pins 1–7,9–11). However, electrical characteristics differ significantly - the 74HC42N,652 uses CMOS inputs and offers wider VCC range and lower power than the bipolar 74LS42.
What is the purpose of the input clamp diodes in the 74HC42N,652?
The 74HC42N,652 integrates input clamp diodes to protect against overvoltage transients. When external signals exceed VCC or fall below GND, these diodes conduct - provided current-limiting resistors are used - allowing safe interfacing to voltages up to VCC + 0.5 V or GND − 0.5 V. This feature is explicitly specified in the General Description section of the 74HC42N,652 datasheet.
74HC42N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
74HC42N,652 FAQ
1.How can I place an order for 74HC42N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC42N,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 74HC42N,652 reliable?
The price and inventory of 74HC42N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC42N,652 is usually 5 days.
3.What payment methods are accepted for 74HC42N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC42N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC42N,652?
74HC42N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC42N,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 74HC42N,652?
For technical support, including 74HC42N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC42N,652 requirements.
6.How does Aetrix verify that 74HC42N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC42N,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 74HC42N,652 meets industry standards.
7.What is the process for return or replacement of 74HC42N,652?
All 74HC42N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC42N,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 74HC42N,652 part is unused and in its original packaging.
Return procedure for 74HC42N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC42N,652 Tags
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