74HC112N Equivalent & Substitute Parts

Part Overview

The 74HC112N is a dual JK-type flip-flop logic integrated circuit manufactured by NXP USA Inc., housed in a 16-DIP package. This component functions as a Set/Preset and Reset element with complementary outputs, operating across a 2V to 6V supply range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

74HC112N,652

NXP USA Inc.In Stock: 106274HC112N,652 Datasheet

Current PartRFQ

SN74HC112N

Texas InstrumentsIn Stock: 2297SN74HC112N Datasheet

DirectRFQ

CD74HC112E

Harris CorporationIn Stock: 56134CD74HC112E Datasheet

UpgradeRFQ

SN74HC112D

Texas InstrumentsIn Stock: 2126SN74HC112D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC112N is determined by the following critical parameters:

Functional Equivalence: All substitute parts must maintain identical JK-type flip-flop architecture with 2 elements, 1 bit per element, complementary outputs, and negative-edge triggering.

Electrical Compatibility: Supply voltage range (2V ~ 6V), output current ratings (5.2 mA), and quiescent current (4 µA) must be maintained or exceeded.

Timing Performance: Propagation delay specifications must not exceed the original 30 ns at 6V with 50 pF load, or be functionally acceptable within system timing constraints.

Package Compatibility: Substitutes are grouped by mounting type—through-hole DIP packages maintain direct pin compatibility, while surface-mount variants (SOIC) require PCB redesign but preserve electrical function.

Compliance & Status: RoHS3 compliance and active product status are preferred for new designs; obsolete parts may be acceptable for legacy system maintenance.

Parameter Comparison

Engineering Selection Recommendations

Direct Pin-Compatible Replacement (Through-Hole DIP):

SN74HC112N (Texas Instruments) is the primary direct substitute for 74HC112N applications. Both parts share identical 16-DIP packaging, through-hole mounting, and electrical specifications. SN74HC112N offers superior propagation delay performance (13 ns versus 30 ns) and maintains active product status with ROHS3 compliance, making it suitable for new designs and legacy system maintenance.

Extended Temperature Range Alternative:

CD74HC112E (Harris Corporation) provides identical 16-DIP packaging and propagation delay matching (30 ns), with extended operating temperature range (-55°C to 125°C versus -40°C to 125°C). However, this part is obsolete and RoHS non-compliant, limiting its use to legacy systems where extended temperature operation is critical and compliance exemptions are available.

Surface-Mount Alternative:

SN74HC112D (Texas Instruments) offers functional equivalence in 16-SOIC surface-mount packaging. This part requires PCB redesign but provides improved propagation delay (21 ns) and maintains ROHS3 compliance and active product status. Selection of this variant is appropriate for new PCB layouts or system redesigns prioritizing surface-mount assembly.

Compliance Considerations:

For applications requiring RoHS3 compliance, SN74HC112N and SN74HC112D are the only compliant options among active or recently discontinued parts. CD74HC112E is non-compliant and should be avoided in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can SN74HC112N directly replace 74HC112N without PCB modification?

A: Yes. SN74HC112N shares identical 16-DIP packaging, pin configuration, and electrical specifications with 74HC112N. Direct socket substitution is possible without PCB changes. The improved propagation delay (13 ns versus 30 ns) provides performance margin in most applications.

Q: What is the difference between the DIP and SOIC package variants?

A: 16-DIP (dual in-line package) is through-hole mounted on PCBs with 0.300" lead spacing. 16-SOIC (small-outline integrated circuit) is surface-mounted with 0.154" width. Functional performance is identical; package selection depends on PCB assembly method and available board space.

Q: Is CD74HC112E suitable for new designs?

A: CD74HC112E is not recommended for new designs. The part is obsolete and RoHS non-compliant. SN74HC112N or SN74HC112D should be selected instead, both offering active product status and full compliance.

Q: What are the temperature operating range differences among substitutes?

A: 74HC112N and CD74HC112E operate from -40°C to 125°C. SN74HC112N and SN74HC112D operate from -40°C to 85°C. For applications requiring operation above 85°C, CD74HC112E is the only option, though compliance and availability constraints apply.

Q: Does propagation delay variation affect circuit functionality?

A: Propagation delay differences (13 ns to 30 ns) are functionally transparent in most logic applications operating at 60-71 MHz clock frequencies. System timing analysis should confirm that faster propagation delays do not introduce setup/hold time violations in specific circuit implementations.

Q: Are all substitutes RoHS compliant?

A: SN74HC112N and SN74HC112D are ROHS3 compliant. CD74HC112E is RoHS non-compliant. For regulated applications requiring RoHS compliance, only SN74HC112N or SN74HC112D are acceptable.