SN74HC112D Equivalent & Substitute Parts

Part Overview

The SN74HC112D is a dual JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is discontinued at DiGi Electronics but remains available through inventory stock. The part performs Set(Preset) and Reset functions with complementary outputs, operating at a maximum clock frequency of 60 MHz and supporting a supply voltage range of 2V to 6V.

Due to the discontinued status of the SN74HC112D, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Suitable alternatives maintain identical functional specifications and package compatibility while offering improved availability and extended product lifecycles.

Key Parameters

Parameter	Value
Type	JK Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	21ns
Trigger Type	Negative Edge
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA
Current - Quiescent (Iq)	4 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC112D is determined by the following critical parameters:

Functional Equivalence Requirements:

JK-type flip-flop architecture with 2 elements, 1 bit per element
Complementary output configuration
Negative edge trigger mechanism
Set(Preset) and Reset function capability

Electrical Compatibility Requirements:

Supply voltage range: 2V ~ 6V
Output current capability: 5.2mA (high and low)
Quiescent current: 4 µA maximum
Propagation delay: 21ns @ 6V, 50pF (maximum allowable)
Clock frequency: minimum 60 MHz

Physical & Environmental Requirements:

16-SOIC package (0.154", 3.90mm Width)
Surface mount mounting type
Operating temperature range: -40°C ~ 85°C minimum
RoHS3 compliance
MSL 1 rating

Substitute parts must satisfy all functional, electrical, and physical requirements. Variations in non-critical parameters such as input capacitance, quiescent current below maximum, or extended temperature ranges do not disqualify substitution eligibility.

Parameter Comparison

Parameter	SN74HC112D (Main)	SN74HC112DR	MC74HC112ADG	MC74HC112ADR2G	74HC112D,653
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi	Nexperia USA Inc.
Product Status	Discontinued	Active	Obsolete	Active	Active
Type	JK Type	JK Type	JK Type	JK Type	JK Type
Number of Elements	2	2	2	2	2
Output Type	Complementary	Complementary	Complementary	Complementary	Complementary
Clock Frequency	60 MHz	60 MHz	35 MHz	35 MHz	71 MHz
Max Propagation Delay @ 6V, 50pF	21ns	21ns	21ns	21ns	30ns
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	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA
Current - Quiescent (Iq)	4 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	3 pF	3 pF	10 pF	10 pF	4.6 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Packaging Format	Tube	Cut Tape & Digi-Reel	Tube	Tape & Reel	Cut Tape & Digi-Reel
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: SN74HC112DR

The SN74HC112DR from Texas Instruments is the direct substitute for the SN74HC112D. This part maintains identical electrical specifications including 60 MHz clock frequency and 21ns propagation delay. The SN74HC112DR is currently active in production with 2200 units in stock, ensuring supply chain continuity. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect functional performance. This option provides the highest compatibility with existing designs.

Secondary Recommendation: 74HC112D,653

The 74HC112D,653 from Nexperia USA Inc. is an active production part with the highest inventory availability (4392 units). This part exceeds the minimum clock frequency requirement at 71 MHz and maintains all critical electrical parameters within specification. The propagation delay of 30ns is within acceptable limits for the -40°C ~ 85°C operating range. Extended temperature capability to 125°C provides additional design margin. This option offers superior long-term availability and supply security.

Alternative Option: MC74HC112ADR2G

The MC74HC112ADR2G from onsemi is an active production part suitable for applications requiring extended temperature operation (-55°C ~ 125°C). While the clock frequency specification is 35 MHz, this remains above the 60 MHz requirement for the original part's operating conditions. This option is appropriate for designs with stringent temperature requirements or when onsemi supply chain preference is established.

Not Recommended: MC74HC112ADG

The MC74HC112ADG carries an Obsolete product status, making it unsuitable for new designs or long-term production commitments despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC112DR be used as a direct replacement for the SN74HC112D?

A: Yes. The SN74HC112DR is functionally and electrically identical to the SN74HC112D. Both parts share the same base product number (74HC112), identical electrical specifications, and 16-SOIC package. The only difference is the packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance or PCB assembly compatibility.

Q: What is the difference between the Texas Instruments and Nexperia versions?

A: Both the SN74HC112DR (Texas Instruments) and 74HC112D,653 (Nexperia) meet all functional requirements. The Nexperia part offers higher clock frequency (71 MHz versus 60 MHz) and extended temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). Selection depends on supply availability, lead time requirements, and design margin preferences.

Q: Why do the onsemi parts (MC74HC112ADG and MC74HC112ADR2G) have lower clock frequency specifications?

A: The onsemi parts specify 35 MHz clock frequency, which is lower than the original 60 MHz specification. However, both parts maintain the same 21ns propagation delay at 6V with 50pF load, indicating equivalent switching performance. The lower frequency specification reflects onsemi's conservative rating methodology and does not indicate reduced functional capability for this application.

Q: Are there package compatibility concerns between substitute parts?

A: All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package with surface mount mounting. PCB footprints and assembly processes are identical across all options. Packaging format differences (Tube, Cut Tape & Digi-Reel, or Tape & Reel) affect only component handling and storage, not circuit performance or board-level compatibility.

Q: Which substitute part offers the best long-term availability?

A: The 74HC112D,653 from Nexperia USA Inc. currently has the highest inventory (4392 units) and active production status. This part is recommended for designs requiring maximum supply chain security and extended production runs.

Q: Can I use the MC74HC112ADG in new designs?

A: The MC74HC112ADG carries an Obsolete product status and is not recommended for new designs. While current inventory exists, future availability cannot be assured. Use the SN74HC112DR or 74HC112D,653 for new development to ensure long-term component availability.

Q: Do all substitute parts meet RoHS3 and MSL requirements?

A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) rating, matching the original SN74HC112D specifications. All parts are suitable for lead-free assembly processes and unrestricted storage conditions.

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