CD74HC123PWT Equivalent & Substitute Parts

Part Overview

The CD74HC123PWT is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-TSSOP surface mount package. This part is discontinued at DiGi Electronics but remains available in inventory (919 pcs). The monostable multivibrator function generates a single output pulse of controlled duration in response to an input trigger, making it essential in timing and pulse-generation applications across industrial, consumer, and embedded systems.

Due to the discontinued status of the CD74HC123PWT, equivalent substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and repair applications.

Substiute Parts

CD74HC123PWT

Texas InstrumentsIn Stock: 1019CD74HC123PWT Datasheet

Current PartRFQ

CD74HC123PWR

Texas InstrumentsIn Stock: 50164CD74HC123PWR Datasheet

DirectRFQ

74HC123PW,112

Nexperia USA Inc.In Stock: 94074HC123PW,112 Datasheet

MFR RecommendedRFQ

74HC123PW,118

Nexperia USA Inc.In Stock: 890874HC123PW,118 Datasheet

MFR RecommendedRFQ

74HC123PW-Q100,118

NXP USA Inc.In Stock: 856974HC123PW-Q100,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC123PWT is determined by the following critical parameters:

Mandatory Matching Parameters:

• Logic Type: Monostable Multivibrator
• Independent Circuits: 2
• Package / Case: 16-TSSOP (0.173", 4.40mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply: 2 V ~ 6 V
• Current - Output High, Low: 5.2 mA, 5.2 mA

Allowable Variation Parameters:

• Propagation Delay: Up to 65 ns (original: 25 ns)
• Operating Temperature: Minimum -40°C acceptable (original: -55°C)
• Manufacturer: Texas Instruments, Nexperia USA Inc., NXP USA Inc.
• Product Status: Active or Obsolete acceptable for equivalent function

All identified substitute parts maintain identical package geometry, electrical supply requirements, and output drive capabilities, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CD74HC123PWR

The CD74HC123PWR is the direct equivalent manufactured by Texas Instruments with active product status. This part maintains identical electrical specifications including 25 ns propagation delay, -55°C to 125°C operating temperature range, and ROHS3 compliance. The primary advantage is continuity with the original manufacturer and the fastest propagation delay specification. Inventory availability is substantial (50,084 pcs).

Secondary Substitutes: 74HC123PW,118 and 74HC123PW,112

Both Nexperia USA Inc. parts are functionally equivalent with identical package, supply voltage, and output current specifications. The 74HC123PW,118 is recommended over 74HC123PW,112 due to active product status versus obsolete status. Both parts feature 65 ns propagation delay, which is acceptable for applications where timing margins accommodate this specification increase. Operating temperature range is -40°C to 125°C, suitable for most industrial and commercial applications.

Automotive-Grade Substitute: 74HC123PW-Q100,118

The 74HC123PW-Q100,118 manufactured by NXP USA Inc. is qualified to AEC-Q100 automotive standards and carries active product status. This part is appropriate for automotive and mission-critical applications requiring automotive-grade component certification. Electrical and package specifications are identical to other Nexperia substitutes.

Selection Criteria:

• For applications requiring original Texas Instruments sourcing: Select CD74HC123PWR
• For cost-optimized procurement with extended temperature range: Select 74HC123PW,118
• For automotive applications: Select 74HC123PW-Q100,118
• For applications sensitive to propagation delay below 30 ns: Verify timing margins before substituting parts with 65 ns specification

Frequently Asked Questions (FAQ)

Q: Can CD74HC123PWR directly replace CD74HC123PWT without circuit modification?

A: Yes. The CD74HC123PWR is a direct equivalent with identical propagation delay (25 ns), operating temperature range (-55°C to 125°C), supply voltage (2 V ~ 6 V), output current (5.2 mA), and 16-TSSOP package. No circuit modifications are required.

Q: What is the impact of using 74HC123PW,118 with 65 ns propagation delay instead of the original 25 ns specification?

A: The 40 ns increase in propagation delay affects pulse timing accuracy. Applications with tight timing requirements must verify that circuit timing margins accommodate this specification change. Applications with relaxed timing tolerances are unaffected.

Q: Are the Nexperia parts (74HC123PW,112 and 74HC123PW,118) pin-compatible with the original CD74HC123PWT?

A: Yes. All substitute parts use the identical 16-TSSOP package with matching pin assignments, supply voltage, and output drive specifications. Pin-for-pin replacement is possible.

Q: What is the difference between 74HC123PW,118 and 74HC123PW,112?

A: Both parts are manufactured by Nexperia USA Inc. with identical electrical specifications. The primary difference is product status: 74HC123PW,118 is active, while 74HC123PW,112 is obsolete. For new designs and long-term availability, 74HC123PW,118 is preferred.

Q: Is the 74HC123PW-Q100,118 suitable for non-automotive applications?

A: Yes. The 74HC123PW-Q100,118 meets all electrical and package specifications for standard logic applications. The AEC-Q100 qualification is an additional certification that does not restrict use in non-automotive applications. This part is appropriate for any application requiring the 74HC123 monostable multivibrator function.

Q: What is the operating temperature difference between CD74HC123PWT and the Nexperia substitutes?

A: The CD74HC123PWT operates from -55°C to 125°C, while Nexperia parts (74HC123PW,118, 74HC123PW,112, and 74HC123PW-Q100,118) operate from -40°C to 125°C. Applications requiring operation below -40°C must use the CD74HC123PWR or CD74HC123PWT.

Q: Are all substitute parts RoHS3 compliant?

A: CD74HC123PWR, 74HC123PW,112, and 74HC123PW,118 are confirmed ROHS3 compliant. Compliance status for 74HC123PW-Q100,118 is not specified in available documentation.