74HC109D,652 Equivalent & Substitute Parts

Part Overview

The 74HC109D,652 is a dual JK-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SOIC surface mount package. This device functions as a 2-element JK flip-flop with complementary outputs, positive edge triggering, and operates across a 2V to 6V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC109D,652
Manufacturer	Nexperia USA Inc.
Base Product Number	74HC109
Type	JK Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Clock Frequency	81 MHz
Max Propagation Delay @ 6V, 50pF	30 ns
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2 mA, 5.2 mA
Current - Quiescent (Iq)	4 µA
Input Capacitance	4.6 pF
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74HC109D,652 is determined by the following critical parameters:

Base product number (74HC109) ensures functional equivalence
JK-type flip-flop configuration with 2 elements, 1 bit per element
Complementary output type and positive edge triggering
16-SOIC package form factor (mechanical compatibility)
Supply voltage range (2V ~ 6V)
Propagation delay specification (30 ns @ 6V, 50pF)
Surface mount mounting type

Substitute parts are grouped into two categories:

Upgrade Substitutes: Parts with enhanced specifications or improved product status (active vs. obsolete), maintaining full electrical and mechanical compatibility.

Similar Substitutes: Parts with the same base functionality but minor variations in input capacitance, operating temperature range, or package dimensions that may require design verification.

Parameter Comparison

Parameter	74HC109D,652 (Main)	CD74HC109M	CD74HC109M96	CD74HC109MT	SN74HC109D	SN74HC109DR	SN74HC109NSR	SN74HC109NSRE4
Manufacturer	Nexperia USA Inc.	Harris Corporation	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	JK Type	JK Type	JK Type	JK Type	JK Type	JK Type	JK Type	JK Type
Number of Elements	2	2	2	2	2	2	2	2
Output Type	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	81 MHz	60 MHz	60 MHz	60 MHz	60 MHz	60 MHz	60 MHz	60 MHz
Max Propagation Delay @ 6V, 50pF	30 ns	30 ns	30 ns	30 ns	30 ns	30 ns	30 ns	30 ns
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	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	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	4 µA	4 µA	4 µA
Input Capacitance	4.6 pF	10 pF	10 pF	10 pF	3 pF	3 pF	3 pF	3 pF
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.209", 5.30mm)	16-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: SN74HC109DR

The SN74HC109DR is the preferred substitute for the 74HC109D,652. It maintains identical electrical specifications (30 ns propagation delay, 5.2 mA output current, 4 µA quiescent current) and mechanical compatibility (16-SOIC 0.154" package). The part holds Active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant with MSL 1 rating, meeting modern regulatory requirements. The only specification variance is a narrower operating temperature range (-40°C to 85°C versus -40°C to 125°C), which is acceptable for most industrial and commercial applications.

Secondary Recommendation: CD74HC109M96

The CD74HC109M96 offers an alternative with Active product status and ROHS3 compliance. It provides an extended operating temperature range (-55°C to 125°C), making it suitable for applications requiring broader temperature performance. The 10 pF input capacitance is higher than the main part, which may affect high-frequency circuit behavior. This part is available in Tape & Reel packaging, supporting high-volume production requirements.

Alternative for Extended Temperature: CD74HC109MT

The CD74HC109MT is suitable for designs requiring the full -55°C to 125°C operating range. It is ROHS3 compliant with MSL 1 rating. However, it is discontinued at DiGi Electronics, limiting procurement options.

Not Recommended: CD74HC109M

The CD74HC109M, manufactured by Harris Corporation, is RoHS non-compliant and obsolete. It does not meet current regulatory standards and should not be selected for new designs.

Package Consideration: SN74HC109NSR and SN74HC109NSRE4

These parts feature a wider 16-SOIC package (0.209" versus 0.154"), which may require PCB layout modifications. They are suitable only if the wider package footprint is accommodated in the design. Both are ROHS3 compliant; SN74HC109NSR is Active, while SN74HC109NSRE4 is discontinued at DiGi Electronics.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74HC109D,652 with SN74HC109DR without circuit modifications?

A: Yes, for most applications. Both parts share identical electrical specifications (30 ns propagation delay, 5.2 mA output current, 2V to 6V supply) and the same 16-SOIC (0.154") package footprint. The only difference is the operating temperature range: SN74HC109DR operates from -40°C to 85°C, while the original operates to 125°C. If your application operates within -40°C to 85°C, no modifications are required.

Q: What is the difference between the 0.154" and 0.209" package widths?

A: These represent different 16-SOIC package body widths. The 0.154" (3.90mm) width is the standard narrow SOIC package used by the main part and most substitutes. The 0.209" (5.30mm) width is a wider variant used by SN74HC109NSR and SN74HC109NSRE4. PCB footprints are not interchangeable; the wider package requires a different land pattern. Select the 0.154" width variants unless your design specifically accommodates the wider package.

Q: Why does CD74HC109M show RoHS non-compliant status?

A: The CD74HC109M is an older Harris Corporation part that predates RoHS3 compliance requirements. It should not be used in new designs intended for markets requiring RoHS compliance. All Texas Instruments variants (SN74HC109 series) and the CD74HC109M96 are ROHS3 compliant.

Q: What is the significance of the input capacitance differences (3 pF, 4.6 pF, 10 pF)?

A: Input capacitance affects circuit loading and high-frequency performance. The main part specifies 4.6 pF, while Texas Instruments variants specify 3 pF (slightly lower) and Harris/older Texas Instruments variants specify 10 pF (higher). For most logic applications operating at standard clock frequencies, these differences are negligible. High-frequency designs (approaching 60+ MHz) should prioritize parts with lower input capacitance.

Q: Is the 81 MHz clock frequency of the main part critical for substitution?

A: The main part specifies 81 MHz maximum clock frequency, while all substitutes specify 60 MHz. This represents a specification difference, not a functional limitation. If your circuit operates below 60 MHz, all substitutes are fully compatible. If your design requires operation above 60 MHz, the main part or equivalent high-speed variants must be used.

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

A: SN74HC109DR is the recommended choice for long-term availability. It holds Active product status, is manufactured by Texas Instruments (a major supplier), and is ROHS3 compliant. CD74HC109M96 is also Active but has higher input capacitance. Avoid parts marked as Discontinued at DiGi Electronics or Obsolete for new designs.

Q: Can I use CD74HC109M96 if I need the extended -55°C to 125°C temperature range?

A: Yes, CD74HC109M96 is suitable for applications requiring extended low-temperature operation down to -55°C. It is ROHS3 compliant and Active. The trade-off is higher input capacitance (10 pF versus 3-4.6 pF), which may affect high-frequency performance. Verify that your circuit design accommodates this capacitance specification.

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