74F74SC Equivalent & Substitute Parts

Part Overview

The 74F74SC is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74F74 series provides two independent D-type flip-flops with complementary outputs, set/preset and reset functions, and positive edge triggering suitable for digital logic applications requiring state storage and synchronization.

Key Parameters

Parameter	Value
Manufacturer Part Number	74F74SC
Manufacturer	onsemi
Category	Logic
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Clock Frequency	125 MHz
Max Propagation Delay @ 5V, 50pF	6.8 ns
Trigger Type	Positive Edge
Voltage Supply Range	4.5V ~ 5.5V
Current - Output High, Low	1 mA, 20 mA
Current - Quiescent (Iq)	16 mA
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74F74SC is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Type: D-Type flip-flop with dual elements
Number of Elements: 2
Number of Bits per Element: 1
Output Type: Complementary
Trigger Type: Positive Edge
Function: Set(Preset) and Reset capability
Voltage Supply Range: 4.5V ~ 5.5V
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount
Package Family: 14-SOIC

Direct Substitutes (SN74F74D, SN74F74DR) maintain identical electrical specifications and package dimensions (0.154", 3.90mm Width), ensuring pin-for-pin compatibility and functional equivalence.

Similar Substitute (SN74F74NSR) differs in package width (0.209", 5.30mm) and propagation delay (8ns vs. 6.8ns), requiring PCB layout verification and timing analysis before implementation.

Parameter Comparison

Parameter	74F74SC (onsemi)	SN74F74D (TI)	SN74F74DR (TI)	SN74F74NSR (TI)
Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	2	2	2	2
Number of Bits per Element	1	1	1	1
Output Type	Complementary	Complementary	Complementary	Complementary
Clock Frequency	125 MHz	145 MHz	145 MHz	145 MHz
Max Propagation Delay @ 5V, 50pF	6.8 ns	5.8 ns	5.8 ns	8 ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Current - Output High, Low	1 mA, 20 mA	1 mA, 20 mA	1 mA, 20 mA	1 mA, 20 mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	16 mA	16 mA	16 mA	16 mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74F74DR (Texas Instruments) is the primary substitute for the 74F74SC. This part is currently in active production status, ROHS3 compliant, and maintains identical package dimensions (14-SOIC, 0.154", 3.90mm Width). The improved propagation delay (5.8ns vs. 6.8ns) provides performance margin without requiring circuit redesign. Inventory availability is substantial at 8047 pieces.

SN74F74D (Texas Instruments) serves as a secondary substitute with equivalent electrical and mechanical specifications. This part carries Last Time Buy status, indicating limited future availability. Selection should prioritize SN74F74DR for new designs and ongoing production.

SN74F74NSR (Texas Instruments) is classified as a similar substitute due to package width variance (0.209", 5.30mm vs. 0.154", 3.90mm) and increased propagation delay (8ns vs. 6.8ns). This part is suitable only when PCB layout accommodates the wider package footprint and timing margins permit the additional delay. Active production status and ROHS3 compliance are confirmed.

All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original 74F74SC.

Frequently Asked Questions (FAQ)

Q: Can SN74F74DR be used as a direct replacement for 74F74SC without PCB modification?

A: Yes. SN74F74DR maintains identical package dimensions (14-SOIC, 0.154", 3.90mm Width), pin configuration, and electrical specifications. No PCB layout changes are required for pin-for-pin substitution.

Q: What is the difference between SN74F74D and SN74F74DR?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: SN74F74D is supplied in Tube packaging, while SN74F74DR is supplied in Cut Tape (CT) & Digi-Reel format. SN74F74DR is in active production; SN74F74D is Last Time Buy status.

Q: Why is SN74F74NSR listed as a similar substitute rather than a direct substitute?

A: SN74F74NSR differs in two critical parameters: package width (0.209", 5.30mm vs. 0.154", 3.90mm) and propagation delay (8ns vs. 6.8ns). These differences require PCB layout verification and timing analysis before implementation. The wider package may not fit existing PCB footprints designed for the narrower 0.154" width.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74F74D, SN74F74DR, and SN74F74NSR are all ROHS3 compliant. The original 74F74SC RoHS status was not specified in available documentation.

Q: What is the inventory status for substitute parts?

A: SN74F74DR has the highest availability at 8047 pieces in active production. SN74F74D has 5700 pieces available but is Last Time Buy status. SN74F74NSR has 4000 pieces available in active production.

Q: Do all parts operate within the same voltage and temperature ranges?

A: Yes. All parts operate at 4.5V ~ 5.5V supply voltage and 0°C ~ 70°C operating temperature range, ensuring functional compatibility in existing circuit designs.

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