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74LCX74M Equivalent & Substitute Parts
Part Overview
The 74LCX74M is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-SOIC package. This device provides two independent D-type flip-flops with Set (Preset) and Reset functions, complementary outputs, and positive edge triggering. The 74LCX74M is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain functional equivalence while offering active product status and extended availability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74LCX74M |
| Manufacturer | onsemi |
| Category | Logic |
| Type | D-Type Flip-Flop |
| Number of Elements | 2 |
| Number of Bits per Element | 1 |
| Output Type | Complementary |
| Clock Frequency | 150 MHz |
| Max Propagation Delay @ 3.3V, 50pF | 7 ns |
| Trigger Type | Positive Edge |
| Current - Output High/Low | 24 mA / 24 mA |
| Voltage - Supply | 2V ~ 3.6V |
| Current - Quiescent (Iq) | 10 µA |
| Input Capacitance | 7 pF |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 14-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
Substitute parts for the 74LCX74M are classified based on the following substitution criteria:
Parametric Equivalence: Parts maintaining identical electrical specifications across all critical parameters including clock frequency (150 MHz), propagation delay (7 ns @ 3.3V, 50pF), output current (24 mA), supply voltage range (2V ~ 3.6V), and package form factor (14-SOIC 0.154" width).
Direct Manufacturer Substitutes: Parts from alternative manufacturers (Texas Instruments, NXP Semiconductors) that meet or exceed the 74LCX74M specifications while maintaining the same functional behavior, package compatibility, and electrical performance envelope.
Similar Variants: Parts with minor parameter variations such as improved propagation delay (5.2 ns), extended supply voltage range (1.2V ~ 3.6V or 1.65V ~ 3.6V), extended operating temperature range (-55°C ~ 125°C or -40°C ~ 125°C), or different packaging formats (Tape & Reel, Cut Tape, Bulk) that remain functionally compatible.
Key Parameters Determining Substitutability:
- D-Type flip-flop architecture with dual elements
- Complementary output configuration
- Positive edge trigger mechanism
- 14-SOIC package footprint compatibility
- Surface mount mounting type
- Supply voltage overlap with 2V ~ 3.6V range
- Propagation delay within acceptable timing margins
- RoHS3 compliance and MSL Level 1 rating
Parameter Comparison
| Parameter | 74LCX74M (onsemi) | MC74LCX74DG (onsemi) | SN74LVC74AD (TI) | 74LVC74AD,118 (NXP) | SN74LVC74ADR (TI) | SN74LVC74ADT (TI) | SN74LVC74AMDREP (TI) |
|---|---|---|---|---|---|---|---|
| Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type | D-Type |
| Number of Elements | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Output Type | Complementary | Complementary | Complementary | Complementary | Complementary | Complementary | Complementary |
| Clock Frequency | 150 MHz | 150 MHz | 150 MHz | 150 MHz | 150 MHz | 150 MHz | 100 MHz |
| Max Propagation Delay @ 3.3V, 50pF | 7 ns | 7 ns | 5.2 ns | 5.2 ns | 5.2 ns | 5.2 ns | 5.2 ns |
| Current - Output High/Low | 24 mA / 24 mA | 24 mA / 24 mA | 24 mA / 24 mA | 24 mA / 24 mA | 24 mA / 24 mA | 24 mA / 24 mA | 24 mA / 24 mA |
| Voltage - Supply | 2V ~ 3.6V | 2V ~ 3.6V | 1.65V ~ 3.6V | 1.2V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V | 2V ~ 3.6V |
| Current - Quiescent (Iq) | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA | 10 µA |
| Input Capacitance | 7 pF | 7 pF | 5 pF | 4 pF | 5 pF | 5 pF | 5 pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -55°C ~ 125°C |
| Package / Case | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Substitute - MC74LCX74DG (onsemi): This parametric equivalent maintains identical specifications to the 74LCX74M while offering active product status. Both parts share the same manufacturer (onsemi), series designation (74LCX), and electrical characteristics. MC74LCX74DG is available in Tube packaging with 2489 units in stock, providing direct functional replacement with improved availability.
Direct Manufacturer Alternative - SN74LVC74ADR (Texas Instruments): This part offers superior propagation delay performance (5.2 ns versus 7 ns), extended operating temperature range (-40°C ~ 125°C), and active product status. The SN74LVC74ADR maintains identical package footprint (14-SOIC 0.154" width), output current capability (24 mA), and quiescent current (10 µA). Available in Cut Tape & Digi-Reel packaging with 2160 units in stock. ROHS3 compliance and MSL Level 1 rating ensure environmental and reliability standards alignment.
Extended Temperature Alternative - SN74LVC74AMDREP (Texas Instruments): This variant provides the widest operating temperature range (-55°C ~ 125°C) among available substitutes, suitable for industrial and automotive applications. Clock frequency specification is 100 MHz (versus 150 MHz), which remains adequate for most legacy 74LCX74M applications. Available in Tape & Reel packaging with 1517 units in stock.
Packaging Variants: SN74LVC74ADT (Tape & Reel, 2662 units) and SN74LVC74AD (Tube, 2212 units) provide identical electrical performance to SN74LVC74ADR with alternative packaging formats for different procurement and assembly requirements.
NXP Alternative - 74LVC74AD,118: This part extends the lower supply voltage limit to 1.2V and reduces input capacitance to 4 pF, offering enhanced low-voltage operation capability. Available in Bulk packaging with 2100 units in stock.
All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and surface mount compatibility with the original 74LCX74M footprint.
Frequently Asked Questions (FAQ)
Q: Can I directly replace 74LCX74M with MC74LCX74DG?
A: Yes. MC74LCX74DG is a parametric equivalent with identical electrical specifications, package footprint, and functional behavior. Both are onsemi products within the 74LCX series. The primary difference is product status: MC74LCX74DG is active with improved inventory availability.
Q: What are the key differences between 74LCX74M and SN74LVC74ADR?
A: Both devices function identically as dual D-type flip-flops in 14-SOIC packages. SN74LVC74ADR offers improved propagation delay (5.2 ns versus 7 ns), extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C), and lower input capacitance (5 pF versus 7 pF). Supply voltage overlap is maintained at 2V ~ 3.6V. SN74LVC74ADR is from Texas Instruments and carries active product status.
Q: Are there package compatibility concerns with these substitutes?
A: Most substitutes use the standard 14-SOIC (0.154", 3.90mm Width) package, ensuring direct PCB footprint compatibility. SN74LVC74ANS and SN74LVC74ANSR use 14-SOIC (0.209", 5.30mm Width) package, which has a different footprint width and is not directly compatible without PCB redesign.
Q: Which substitute offers the best performance?
A: SN74LVC74ADR, SN74LVC74ADT, and SN74LVC74AD all provide the fastest propagation delay (5.2 ns) and widest operating temperature range (-40°C ~ 125°C). Selection between these variants depends on packaging requirements: Cut Tape & Digi-Reel (ADR), Tape & Reel (ADT), or Tube (AD).
Q: Is SN74LVC74AMDREP suitable for high-temperature applications?
A: Yes. SN74LVC74AMDREP supports the extended temperature range of -55°C ~ 125°C, making it suitable for industrial and automotive environments. Clock frequency is specified at 100 MHz, which is lower than other variants but remains adequate for most legacy applications.
Q: What compliance certifications do these substitutes carry?
A: All recommended substitutes are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Texas Instruments parts include ECCN EAR99 and HTSUS 8542.39.0001 classifications. These certifications ensure regulatory compliance and reliability standards alignment with the original 74LCX74M.
Q: Can I use 74LVC74AD,118 (NXP) in place of 74LCX74M?
A: Yes, with consideration for extended low-voltage capability. This part operates at 1.2V ~ 3.6V supply voltage (versus 2V ~ 3.6V), providing enhanced performance in low-voltage applications. Input capacitance is reduced to 4 pF. Packaging is Bulk format rather than standard tube or tape & reel.
Q: What is the inventory status for these substitutes?
A: MC74LCX74DG has the highest inventory (2489 units), followed by SN74LVC74ADT (2662 units) and SN74LVC74ADR (2160 units). All recommended substitutes are available in quantities exceeding 700 units, ensuring production continuity for the obsolete 74LCX74M.
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