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74HC74D/AUJ Equivalent & Substitute Parts
Part Overview
The 74HC74D/AUJ is a dual D-type flip-flop logic integrated circuit manufactured by NXP USA Inc. in 14-SOIC surface mount packaging. This device functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The part is currently active in production with 1108 units in stock.
Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for specific manufacturing processes, or when design requirements demand different performance characteristics within the 74HC logic family specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | 74HC74D/AUJ | — |
| Manufacturer | NXP USA Inc. | — |
| Base Product Number | 74HC74 | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Type | D-Type Flip-Flop | — |
| Number of Elements | 2 | — |
| Number of Bits per Element | 1 | — |
| Output Type | Complementary | — |
| Trigger Type | Positive Edge | — |
| Clock Frequency | 82 | MHz |
| Max Propagation Delay @ 6V, 50pF | 37 | ns |
| Voltage - Supply | 2 to 6 | V |
| Current - Output High, Low | 5.2, 5.2 | mA |
| Current - Quiescent (Iq) | 40 | µA |
| Input Capacitance | 3.5 | pF |
| Operating Temperature Range | -40 to 125 | °C |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution within the 74HC74 logic family is determined by the following critical parameters:
Mandatory Compatibility Parameters:
- Base product number: 74HC74
- Package type: 14-SOIC (0.154", 3.90mm Width)
- Function: D-Type flip-flop with 2 elements, 1 bit per element
- Output type: Complementary
- Trigger type: Positive edge
- Voltage supply range: 2V to 6V minimum
- Mounting type: Surface mount
Performance Parameters (Allowable Variation):
- Clock frequency: 50 MHz to 94 MHz
- Propagation delay: 15ns to 37ns @ 6V, 50pF
- Quiescent current: 4 µA to 40 µA
- Input capacitance: 3 pF to 10 pF
- Operating temperature range: -55°C to 125°C (minimum -40°C required)
Packaging Format Variations: Substitutes are available in Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR) formats. These represent different supply methods for the same 14-SOIC package and do not affect electrical compatibility.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Clock Frequency (MHz) | Propagation Delay @ 6V, 50pF (ns) | Quiescent Current (µA) | Input Capacitance (pF) | Operating Temperature (°C) | Product Status | Packaging Format |
|---|---|---|---|---|---|---|---|---|
| 74HC74D/AUJ | NXP USA Inc. | 82 | 37 | 40 | 3.5 | -40 to 125 | Active | — |
| CD74HC74M | Texas Instruments | 50 | 30 | 4 | 10 | -55 to 125 | Discontinued at DiGi Electronics | Tube |
| CD74HC74M96 | Texas Instruments | 50 | 30 | 4 | 10 | -55 to 125 | Active | Cut Tape (CT) & Digi-Reel® |
| MM74HC74AM | Fairchild Semiconductor | 94 | 19 | 4 | 5 | -40 to 85 | Active | — |
| SN74HC74DR | Texas Instruments | 60 | 15 | 4 | 3 | -40 to 85 | Active | Cut Tape (CT) & Digi-Reel® |
| SN74HC74DT | Texas Instruments | 60 | 30 | 4 | 3 | -40 to 85 | Obsolete | Tape & Reel (TR) |
| 74HC74D,653 | NXP Semiconductors | 82 | 37 | 40 | 3.5 | -40 to 125 | Active | — |
| 74HC74D-Q100,118 | Nexperia USA Inc. | 82 | 37 | 40 | 3.5 | -40 to 125 | Active | Tape & Reel (TR) |
| 74HC74D-Q100HL | Nexperia USA Inc. | 82 | 37 | 40 | 3.5 | -40 to 125 | Not For New Designs | Cut Tape (CT) |
Engineering Selection Recommendations
Direct Parametric Equivalents (Identical Electrical Performance):
74HC74D,653 and 74HC74D-Q100,118 are parametric equivalents to the 74HC74D/AUJ. These parts share identical clock frequency (82 MHz), propagation delay (37ns), quiescent current (40 µA), and input capacitance (3.5 pF). The 74HC74D-Q100,118 variant includes AEC-Q100 automotive qualification and is suitable for automotive-grade applications. Both maintain the full -40°C to 125°C operating temperature range.
Active Production Alternatives with Performance Trade-offs:
CD74HC74M96 (Texas Instruments, Active) offers reduced propagation delay (30ns) and lower quiescent current (4 µA) compared to the main part, with extended temperature range (-55°C to 125°C). This part is available in Cut Tape & Digi-Reel® format.
SN74HC74DR (Texas Instruments, Active) provides the fastest propagation delay (15ns) among all substitutes with the lowest input capacitance (3 pF). Operating temperature range is -40°C to 85°C. This part is available in Cut Tape & Digi-Reel® format.
MM74HC74AM (Fairchild Semiconductor, Active) offers high clock frequency (94 MHz) and fast propagation delay (19ns) with reduced input capacitance (5 pF). Operating temperature range is -40°C to 85°C.
Parts Not Recommended for New Designs:
SN74HC74DT is marked Obsolete and should not be selected for new designs. CD74HC74M is discontinued at DiGi Electronics. 74HC74D-Q100HL is marked Not For New Designs.
Compliance and Certifications:
All listed parts maintain ROHS3 compliance and REACH unaffected status. The 74HC74D-Q100,118 and 74HC74D-Q100HL variants include AEC-Q100 automotive qualification for applications requiring automotive-grade components.
Frequently Asked Questions (FAQ)
Q: Can I substitute 74HC74D/AUJ with CD74HC74M96?
A: Yes. Both parts share the same 14-SOIC package, D-type flip-flop function with 2 elements, complementary outputs, and positive edge triggering. CD74HC74M96 operates within the required 2V to 6V supply range and maintains the same RoHS3 compliance. The propagation delay is faster (30ns vs. 37ns), and quiescent current is lower (4 µA vs. 40 µA), making it electrically compatible. The extended temperature range (-55°C to 125°C) provides additional margin.
Q: What is the difference between 74HC74D,653 and 74HC74D-Q100,118?
A: Both parts are parametric equivalents with identical electrical specifications (82 MHz clock frequency, 37ns propagation delay, 40 µA quiescent current, 3.5 pF input capacitance). The 74HC74D-Q100,118 includes AEC-Q100 automotive qualification and is supplied in Tape & Reel format, while 74HC74D,653 is supplied in standard format. Select 74HC74D-Q100,118 for automotive applications requiring AEC-Q100 certification.
Q: Why does SN74HC74DR have a lower propagation delay than the main part?
A: SN74HC74DR achieves 15ns propagation delay (vs. 37ns for 74HC74D/AUJ) through different semiconductor process technology and design optimization. Both parts meet the 74HC74 functional specification and are electrically compatible within the 2V to 6V supply range. The faster propagation delay may provide timing margin in high-speed applications but does not affect functional compatibility.
Q: Can I use 74HC74D-Q100HL as a substitute?
A: 74HC74D-Q100HL is marked Not For New Designs and should not be selected for new applications. While it is parametrically equivalent to 74HC74D/AUJ, its discontinued design status makes it unsuitable for long-term production use.
Q: What packaging formats are available for 74HC74 substitutes?
A: Substitutes are available in three packaging formats: Tube (CD74HC74M), Cut Tape & Digi-Reel® (CD74HC74M96, SN74HC74DR), and Tape & Reel (SN74HC74DT, 74HC74D-Q100,118). These formats represent different supply methods for the same 14-SOIC package and do not affect electrical compatibility. Select based on your manufacturing process requirements.
Q: Are all 74HC74 substitutes RoHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance of the main part 74HC74D/AUJ.
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