74HC42N Equivalent & Substitute Parts

Part Overview

The 74HC42N is a 1 x 4:10 decoder logic integrated circuit manufactured by NXP USA Inc. in a 16-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The decoder function remains consistent across qualified substitutes, provided electrical and mechanical parameters remain within specified tolerances.

Substiute Parts

74HC42N,652

NXP USA Inc.In Stock: 101774HC42N,652 Datasheet

Current PartRFQ

CD74HC42E

Texas InstrumentsIn Stock: 2219CD74HC42E Datasheet

UpgradeRFQ

SN74HC42N

Texas InstrumentsIn Stock: 1719SN74HC42N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC42N is determined by strict equivalence in the following parameters:

• Decoder circuit configuration (1 x 4:10)
• Physical package format (16-DIP with 0.300" pitch)
• Output current specifications (5.2mA symmetrical)
• Supply voltage operating range (2V ~ 6V minimum)
• Through-hole mounting compatibility
• RoHS3 compliance status

Substitute parts must maintain identical decoder functionality and pinout compatibility. Operating temperature range and product status variations are noted but do not prevent substitution when other parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both CD74HC42E and SN74HC42N are active-status alternatives to the obsolete 74HC42N. Selection between these substitutes depends on application temperature requirements:

The CD74HC42E provides extended low-temperature operation (-55°C minimum) compared to the original specification (-40°C minimum), offering broader environmental coverage for demanding applications.

The SN74HC42N maintains the original temperature floor (-40°C) but operates to 85°C maximum, which is 40°C below the original specification. This reduced upper temperature limit may restrict use in high-temperature environments.

Both substitutes maintain full electrical equivalence in decoder function, output current, and supply voltage specifications. RoHS3 and REACH compliance are consistent across all three parts.

Frequently Asked Questions (FAQ)

Q: Can CD74HC42E and SN74HC42N be used interchangeably with 74HC42N?

A: Both parts are functionally equivalent for decoder operation within their respective temperature ranges. Direct substitution is valid when application temperature requirements fall within the overlapping range of -40°C to 85°C.

Q: What is the primary difference between the two substitute options?

A: CD74HC42E extends the minimum operating temperature to -55°C, while SN74HC42N reduces the maximum operating temperature to 85°C. The original 74HC42N specification is -40°C to 125°C. Select based on your application's temperature extremes.

Q: Are package dimensions identical across all three parts?

A: Yes. All three parts use 16-DIP packaging with 0.300" (7.62mm) pitch, ensuring identical PCB footprint and through-hole mounting compatibility.

Q: Do compliance certifications differ between the parts?

A: No. All three parts maintain ROHS3 compliance and REACH Unaffected status, meeting equivalent regulatory requirements.

Q: Which substitute is recommended for new designs?

A: Both CD74HC42E and SN74HC42N are active products from Texas Instruments. CD74HC42E is preferred for applications requiring extended temperature range coverage. SN74HC42N is suitable for standard industrial temperature environments.