SN74HC112DT Equivalent & Substitute Parts

Part Overview

The SN74HC112DT is a dual JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a Set(Preset) and Reset element with complementary outputs, operating at a maximum clock frequency of 60 MHz with negative edge triggering. The SN74HC112DT is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC112DT
Manufacturer	Texas Instruments
Base Product Number	74HC112
Type	JK Type Flip-Flop, 2 Element, 1 Bit per Element
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	21 ns
Trigger Type	Negative Edge
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	4 µA
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC112DT is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

JK-type flip-flop architecture with 2 elements, 1 bit per element
Negative edge trigger configuration
Complementary output type
Supply voltage range: 2V ~ 6V
Set(Preset) and Reset function capability
16-SOIC package mechanical compatibility

Performance Parameters:

Clock frequency capability (minimum 60 MHz required for direct replacement)
Propagation delay characteristics (21 ns @ 6V, 50pF baseline)
Output current drive (5.2 mA minimum for both high and low states)
Quiescent current (4 µA maximum)

Compliance & Environmental:

ROHS3 compliance
MSL Level 1 rating
Operating temperature range support

Substitute parts are grouped by their ability to meet these criteria while accounting for product status and availability.

Parameter Comparison

Parameter	SN74HC112DT (Main)	SN74HC112DR	MC74HC112ADG	MC74HC112ADR2G	74HC112D,653
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi	Nexperia USA Inc.
Product Status	Discontinued	Active	Obsolete	Active	Active
Packaging	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Type	JK Type, 2 Element, 1 Bit	JK Type, 2 Element, 1 Bit	JK Type, 2 Element, 1 Bit	JK Type, 2 Element, 1 Bit	JK Type, 2 Element, 1 Bit
Clock Frequency	60 MHz	60 MHz	35 MHz	35 MHz	71 MHz
Max Propagation Delay @ 6V, 50pF	21 ns	21 ns	21 ns	21 ns	30 ns
Trigger Type	Negative Edge	Negative Edge	Negative Edge	Negative Edge	Negative Edge
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Output High, Low	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	4 µA	4 µA	4 µA	4 µA	4 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Input Capacitance	3 pF	3 pF	10 pF	10 pF	4.6 pF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: SN74HC112DR

The SN74HC112DR from Texas Instruments is the direct parametric equivalent to the SN74HC112DT. This part maintains identical electrical specifications including 60 MHz clock frequency, 21 ns propagation delay, and -40°C ~ 85°C operating temperature range. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect circuit functionality. Product status is Active, ensuring ongoing availability and supply chain reliability. ROHS3 compliance and MSL Level 1 rating are maintained.

Secondary Substitute: 74HC112D,653

The 74HC112D,653 from Nexperia USA Inc. provides an alternative with enhanced performance characteristics. Clock frequency is rated at 71 MHz, exceeding the original 60 MHz specification. Propagation delay is 30 ns at 6V with 50pF load, which is within acceptable tolerance for most applications. Operating temperature range extends to -40°C ~ 125°C, providing broader environmental coverage. Input capacitance is 4.6 pF, closely matching the original 3 pF specification. Product status is Active with robust inventory availability. ROHS3 compliance and MSL Level 1 rating are maintained. This part is suitable for applications where extended temperature range or higher frequency capability provides design margin.

Not Recommended: MC74HC112ADG and MC74HC112ADR2G

The onsemi variants (MC74HC112ADG and MC74HC112ADR2G) operate at reduced clock frequency (35 MHz) and exhibit higher input capacitance (10 pF). While these parts share the same package and basic JK-type architecture, the performance degradation makes them unsuitable as direct replacements for the SN74HC112DT in timing-critical applications. MC74HC112ADG carries Obsolete product status, limiting supply reliability. MC74HC112ADR2G is Active but the performance limitations outweigh availability advantages.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC112DR be used as a direct replacement for the SN74HC112DT?

A: Yes. The SN74HC112DR is electrically and functionally identical to the SN74HC112DT. Both parts share the same 60 MHz clock frequency, 21 ns propagation delay, and -40°C ~ 85°C operating temperature. The difference in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) does not affect circuit performance or pin compatibility. Both are housed in 16-SOIC packages with identical pinouts.

Q: What is the primary difference between the SN74HC112DT and the 74HC112D,653?

A: The 74HC112D,653 offers higher clock frequency (71 MHz versus 60 MHz) and extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). Propagation delay is slightly longer at 30 ns compared to 21 ns. Input capacitance is marginally higher at 4.6 pF versus 3 pF. These differences are minor and the 74HC112D,653 is suitable for most applications requiring the SN74HC112DT, with the added benefit of broader environmental specifications.

Q: Why are the onsemi parts (MC74HC112ADG and MC74HC112ADR2G) not recommended as substitutes?

A: Both onsemi variants operate at 35 MHz clock frequency, significantly below the 60 MHz specification of the SN74HC112DT. Input capacitance is also elevated at 10 pF. These performance reductions may cause timing violations in circuits designed for the original 60 MHz specification. MC74HC112ADG is Obsolete, creating supply chain risk. While MC74HC112ADR2G is Active, the performance limitations make it unsuitable as a direct replacement.

Q: Are all substitute parts ROHS3 compliant and MSL Level 1 rated?

A: Yes. All substitute parts listed (SN74HC112DR, MC74HC112ADG, MC74HC112ADR2G, and 74HC112D,653) are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original SN74HC112DT specifications.

Q: What is the significance of the 16-SOIC package compatibility?

A: All substitute parts are housed in 16-SOIC (0.154", 3.90mm Width) packages with identical pinouts and mechanical dimensions. This ensures direct PCB footprint compatibility without requiring layout modifications or rework. Pin-for-pin substitution is possible without circuit redesign.

Q: Can the 74HC112D,653 be used in applications where the SN74HC112DT was originally specified?

A: Yes. The 74HC112D,653 meets or exceeds all critical electrical parameters of the SN74HC112DT. Higher clock frequency (71 MHz) and extended temperature range (-40°C ~ 125°C) provide additional design margin. Propagation delay of 30 ns is acceptable for most timing-critical applications. This part is suitable for new designs and replacement applications.

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