74HC193DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC193DB,112 is a 4-bit binary counter IC manufactured by Nexperia USA Inc., designed for synchronous counting applications with both up and down counting capability. This component features positive edge triggering, asynchronous reset, and operates across a wide supply voltage range of 2V to 6V. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

74HC193DB,112

Nexperia USA Inc.In Stock: 113474HC193DB,112 Datasheet

Current PartRFQ

SN74HC193PW

Texas InstrumentsIn Stock: 2236SN74HC193PW Datasheet

SimilarRFQ

SN74HC193PWR

Texas InstrumentsIn Stock: 5465SN74HC193PWR Datasheet

SimilarRFQ

SN74HC193PWT

Texas InstrumentsIn Stock: 723SN74HC193PWT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC193DB,112 is determined by the following critical parameters that must remain consistent across equivalent parts:

• Logic Function: Binary counter with 4-bit capacity, up/down counting direction
• Electrical Interface: Positive edge trigger, asynchronous reset, synchronous timing
• Supply Voltage: 2V to 6V operating range
• Mounting Technology: Surface mount configuration
• Package Compatibility: 16-pin small outline package variants (SSOP or TSSOP)
• Compliance: ROHS3 compliance and EAR99 classification

The substitute parts identified (SN74HC193PW, SN74HC193PWR, SN74HC193PWT) maintain functional equivalence through identical logic specifications and compatible package footprints. Variations in count rate, operating temperature range, and product status reflect manufacturing differences between suppliers but do not affect core counter functionality within standard application parameters.

Parameter Comparison

Engineering Selection Recommendations

SN74HC193PWR (Texas Instruments) is the primary recommended substitute. This part maintains active product status, ensuring long-term availability and supply chain stability. It provides ROHS3 compliance identical to the original specification and carries the same EAR99 classification. The 16-TSSOP package offers improved thermal characteristics and reduced footprint compared to the 16-SSOP variant, with compatible pinout for direct functional replacement.

SN74HC193PW (Texas Instruments) serves as a secondary option with equivalent electrical specifications. This part carries Last Time Buy status, indicating limited future availability. Selection of this variant should be reserved for applications where packaging format (Tube) provides procurement advantages or where existing inventory management systems require this specific packaging configuration.

SN74HC193PWT (Texas Instruments) is not recommended for new designs. This part is discontinued at DiGi Electronics and carries restricted availability status, limiting its viability for sustained production requirements.

All three Texas Instruments substitutes operate within the 2V to 6V supply range and maintain synchronous counter functionality with positive edge triggering and asynchronous reset. The reduced count rate specification (24 MHz versus 49 MHz) does not impact compatibility in standard counter applications operating below this threshold.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC193PWR directly replace the 74HC193DB,112 in existing PCB designs?

A: The SN74HC193PWR provides functional equivalence with compatible pinout. However, the package transition from 16-SSOP to 16-TSSOP requires PCB footprint modification. The 16-TSSOP package has a narrower body width (4.40mm versus 5.30mm), necessitating updated land pattern geometry. Pin pitch and lead count remain identical, ensuring electrical compatibility once footprint adjustment is completed.

Q: What is the significance of the count rate difference between the original part (49 MHz) and the substitute (24 MHz)?

A: The count rate specification defines the maximum frequency at which the counter can reliably transition between states. The 74HC193DB,112 specification of 49 MHz provides higher frequency capability than the 24 MHz Texas Instruments variants. For applications operating below 24 MHz, this difference is not functionally significant. Applications requiring operation above 24 MHz must retain the original Nexperia part or identify alternative counter architectures.

Q: Are there temperature range implications when substituting the 74HC193DB,112?

A: The original part specifies -40°C to 125°C operating range, while all Texas Instruments substitutes specify -40°C to 85°C. Applications requiring operation above 85°C cannot use the Texas Instruments variants. For standard industrial temperature ranges (-40°C to 85°C), the substitutes provide equivalent thermal performance.

Q: What packaging considerations apply to the 16-SSOP to 16-TSSOP transition?

A: Both packages are surface mount small outline variants with 16 pins and identical pin pitch (0.050"). The primary difference is body width: 16-SSOP measures 5.30mm while 16-TSSOP measures 4.40mm. This dimensional change requires PCB land pattern redesign but does not affect electrical performance or pin assignment. Solder reflow parameters remain compatible between package types.

Q: Why is SN74HC193PWR recommended over SN74HC193PW despite identical electrical specifications?

A: SN74HC193PWR maintains active product status with ongoing manufacturing and supply commitment from Texas Instruments. SN74HC193PW carries Last Time Buy designation, indicating the manufacturer has announced end-of-life with limited future availability. For production designs requiring sustained component supply, active status provides superior long-term reliability and procurement certainty.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 74HC193DB,112 and all identified substitutes (SN74HC193PW, SN74HC193PWR, SN74HC193PWT) carry ROHS3 Compliant certification. This compliance status is maintained across all variants, ensuring consistency with environmental and regulatory requirements.