74HC123DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC123DB,112 is a monostable multivibrator logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This device features dual independent circuits with 65 ns propagation delay and operates across a 2 V to 6 V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74HC123DB,112

Nexperia USA Inc.In Stock: 82274HC123DB,112 Datasheet

Current PartRFQ

74HC123PW,118

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

SimilarRFQ

CD74HC123PWR

Texas InstrumentsIn Stock: 50164CD74HC123PWR Datasheet

SimilarRFQ

CD74HC123PWT

Texas InstrumentsIn Stock: 1019CD74HC123PWT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HC123DB,112 is determined by the following critical parameters:

• Base product number (74HC123) ensures functional equivalence as a monostable multivibrator
• Dual independent circuits (2) must be maintained
• Output current capability (5.2 mA / 5.2 mA) must be equal or greater
• Supply voltage range (2 V ~ 6 V) must be compatible or broader
• Operating temperature range must support the application requirements
• Package type compatibility depends on PCB layout constraints and reflow process capability

Substitute parts are grouped into two categories based on propagation delay performance and package configuration:

Category 1: Same Propagation Delay (65 ns), Different Package

• 74HC123PW,118: Nexperia USA Inc., 16-TSSOP package, active product status

Category 2: Improved Propagation Delay (25 ns), Different Package

• CD74HC123PWR: Texas Instruments, 16-TSSOP package, active product status
• CD74HC123PWT: Texas Instruments, 16-TSSOP package, discontinued at DiGi Electronics

Parameter Comparison

Engineering Selection Recommendations

74HC123PW,118 (Nexperia USA Inc.)

This substitute maintains identical electrical performance with 65 ns propagation delay and equivalent output current specifications. The primary difference is the package transition from 16-SSOP to 16-TSSOP, which reduces the package width from 5.30 mm to 4.40 mm. This part carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Selection of this part requires PCB layout modification to accommodate the narrower TSSOP package footprint.

CD74HC123PWR (Texas Instruments)

This substitute offers improved propagation delay performance at 25 ns, representing a 62% reduction compared to the original 65 ns specification. The part maintains all electrical parameters including output current and supply voltage range. Operating temperature range extends to -55°C, providing broader environmental coverage. The 16-TSSOP package requires PCB layout modification. Active product status ensures continued availability. This selection is appropriate when timing margin improvement is beneficial to system performance.

CD74HC123PWT (Texas Instruments)

This substitute provides identical electrical performance to CD74HC123PWR with 25 ns propagation delay and extended temperature range to -55°C. Product status is discontinued at DiGi Electronics, limiting future procurement options. This part should be selected only when existing inventory is available and long-term supply is not a requirement.

Frequently Asked Questions (FAQ)

Q: Can 74HC123PW,118 be used as a direct replacement for 74HC123DB,112?

A: Electrical substitution is valid. Both parts share identical logic type, circuit count, propagation delay, output current, and supply voltage specifications. The primary consideration is package compatibility. The 74HC123PW,118 uses a 16-TSSOP package (4.40 mm width) versus the original 16-SSOP package (5.30 mm width), requiring PCB footprint modification.

Q: What is the advantage of CD74HC123PWR over the original part?

A: CD74HC123PWR reduces propagation delay from 65 ns to 25 ns, improving timing performance by 62%. Operating temperature range extends from -40°C to -55°C minimum, supporting broader environmental applications. All other electrical parameters remain equivalent.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The main part 74HC123DB,112 and all substitute parts (74HC123PW,118, CD74HC123PWR, CD74HC123PWT) carry ROHS3 compliance certification.

Q: What is the MSL rating for these parts?

A: All parts in this comparison carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Why is CD74HC123PWT listed if it is discontinued?

A: CD74HC123PWT is included for reference purposes as it appears in the substitute list for the main part. Current inventory exists, but future procurement may be limited. CD74HC123PWR is the recommended active alternative from Texas Instruments.

Q: Can I use these parts interchangeably on the same PCB?

A: Electrical interchangeability is confirmed across all parts. Physical interchangeability depends on package type. The 16-SSOP package (original) and 16-TSSOP packages (substitutes) have different footprints and cannot be used interchangeably without PCB redesign.

Q: What compliance certifications apply to all parts?

A: All parts are ROHS3 compliant, REACH unaffected, and carry ECCN classification EAR99 with HTSUS code 8542.39.0001.