74LVC1G123DCTRG4 Equivalent & Substitute Parts

Part Overview

The 74LVC1G123DCTRG4 is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in an 8-LSSOP surface mount package. This component features Schmitt trigger input capability and operates across a wide supply voltage range of 1.65 V to 5.5 V with an 18.5 ns propagation delay. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74LVC series provides low-voltage CMOS logic functionality suitable for timing and pulse generation circuits.

Substiute Parts

74LVC1G123DCTRG4

Texas InstrumentsIn Stock: 88174LVC1G123DCTRG4 Datasheet

Current PartRFQ

74LVC1G123DP,125

Nexperia USA Inc.In Stock: 2571874LVC1G123DP,125 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74LVC1G123DCTRG4 is based on the following critical parameters that must remain constant or compatible:

• Logic Function: Monostable multivibrator with single independent circuit
• Schmitt Trigger Input: Required capability
• Supply Voltage Range: 1.65 V – 5.5 V (must support full range)
• Output Current Capability: 32 mA minimum for both high and low states
• Operating Temperature Range: -40°C to 125°C
• Base Product Number: 74LVC1G123 (same functional family)
• Compliance: ROHS3 compliant, MSL Level 1

The 74LVC1G123DP,125 qualifies as a direct substitute based on identical logic function, circuit count, Schmitt trigger input, supply voltage range, output current capability, and operating temperature specifications. While the propagation delay differs (5.3 ns versus 18.5 ns), this represents an improvement in performance and does not prevent functional substitution. Package differences exist but both are surface mount 8-pin configurations suitable for equivalent PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

The 74LVC1G123DP,125 from Nexperia USA Inc. is the qualified substitute for the discontinued 74LVC1G123DCTRG4. Both parts maintain identical electrical specifications for logic function, circuit configuration, Schmitt trigger input, output current capability, and operating conditions. Both achieve ROHS3 compliance and MSL Level 1 rating, ensuring equivalent environmental and regulatory suitability.

The primary consideration is package compatibility. The main part uses 8-LSSOP packaging (0.110" width), while the substitute uses 8-TSSOP packaging (0.118" width). Both are 8-pin surface mount packages with similar pin configurations suitable for the 74LVC1G123 base product number. PCB layout modifications may be required to accommodate the slightly wider TSSOP package footprint.

The substitute part offers superior propagation delay performance (5.3 ns versus 18.5 ns), which provides timing margin improvement in applications where the original part's delay specification was marginal. This performance enhancement does not introduce compatibility issues and may improve overall circuit performance.

Frequently Asked Questions (FAQ)

Q: Can the 74LVC1G123DP,125 directly replace the 74LVC1G123DCTRG4 without circuit modifications?

A: Electrical substitution is direct. Both parts share identical logic function, Schmitt trigger input, output current ratings, supply voltage range, and operating temperature specifications. Pin configuration compatibility exists for the 74LVC1G123 base product. Physical package differences (8-LSSOP versus 8-TSSOP) require PCB footprint verification and potential layout adjustment.

Q: What is the significance of the propagation delay difference between these parts?

A: The 74LVC1G123DP,125 exhibits 5.3 ns propagation delay compared to 18.5 ns for the original part. This represents faster signal response and provides additional timing margin in pulse generation and monostable timing applications. The faster delay does not create compatibility issues and generally improves circuit performance.

Q: Are both parts suitable for the same supply voltage and temperature operating ranges?

A: Yes. Both parts operate across 1.65 V to 5.5 V supply voltage and -40°C to 125°C temperature range. Compliance certifications (ROHS3, MSL Level 1) are identical, ensuring equivalent environmental and regulatory qualification.

Q: What packaging considerations apply when substituting these parts?

A: The main part uses 8-LSSOP (0.110" width) while the substitute uses 8-TSSOP (0.118" width). Both are surface mount 8-pin packages. PCB footprint libraries must be verified for compatibility, and layout spacing may require adjustment due to the 0.008" width difference. Pin pitch and height specifications should be confirmed against design requirements.

Q: Why is the original part discontinued and what is the availability status of the substitute?

A: The 74LVC1G123DCTRG4 is discontinued at DiGi Electronics. The 74LVC1G123DP,125 maintains active product status with 25,657 pieces in stock, ensuring reliable supply for production and maintenance applications.