74HC273DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC273DB,112 is a D-Type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., featuring 1 element with 8-bit configuration and positive edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply range with a maximum propagation delay of 26ns at 6V with 50pF load, suitable for general-purpose digital logic applications requiring edge-triggered storage.

Substiute Parts

74HC273DB,112

Nexperia USA Inc.In Stock: 86274HC273DB,112 Datasheet

Current PartRFQ

SN74HC273QPWRG4Q1

Texas InstrumentsIn Stock: 737SN74HC273QPWRG4Q1 Datasheet

DirectRFQ

SN74HC273QPWRQ1

Texas InstrumentsIn Stock: 6873SN74HC273QPWRQ1 Datasheet

DirectRFQ

MM74HC273MTCX

Fairchild SemiconductorIn Stock: 2825MM74HC273MTCX Datasheet

SimilarRFQ

SN74HC273DBR

Texas InstrumentsIn Stock: 1971SN74HC273DBR Datasheet

SimilarRFQ

SN74HC273PW

Texas InstrumentsIn Stock: 2282SN74HC273PW Datasheet

SimilarRFQ

SN74HC273PWR

Texas InstrumentsIn Stock: 300374SN74HC273PWR Datasheet

SimilarRFQ

SN74HC273PWT

Texas InstrumentsIn Stock: 1144SN74HC273PWT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC273DB,112 is determined by the following critical parameters that must remain consistent across equivalent parts:

• Logic Function: D-Type flip-flop with 1 element, 8-bit configuration, positive edge trigger, master reset function, and non-inverted output
• Electrical Specifications: Supply voltage range 2V ~ 6V, output current capability 5.2mA (high and low), quiescent current 8 µA
• Timing Characteristics: Maximum propagation delay specifications at specified voltage and load conditions
• Package Compatibility: Surface mount technology with pin-compatible or functionally equivalent packaging
• Compliance Standards: RoHS3 compliance and MSL rating for manufacturing and storage requirements

Substitute parts are grouped into two categories:

Direct Substitutes maintain identical or superior electrical performance with compatible packaging:

• SN74HC273QPWRG4Q1 (Texas Instruments, 20-TSSOP package)
• SN74HC273QPWRQ1 (Texas Instruments, 20-TSSOP package)

Similar Substitutes provide equivalent functionality with acceptable parameter variations:

• MM74HC273MTCX (Fairchild Semiconductor, 20-TSSOP package)
• SN74HC273DBR (Texas Instruments, 20-SSOP package)
• SN74HC273PW (Texas Instruments, 20-TSSOP package, discontinued at DiGi Electronics)
• SN74HC273PWR (Texas Instruments, 20-TSSOP package)
• SN74HC273PWT (Texas Instruments, 20-TSSOP package, discontinued at DiGi Electronics)

Parameter Comparison

Engineering Selection Recommendations

For Active Production Designs: SN74HC273PWR is the recommended primary substitute. It is actively manufactured by Texas Instruments, maintains ROHS3 compliance, carries MSL 1 rating for unlimited storage, and provides 300,300 pieces in current inventory. The 20-TSSOP package offers improved thermal characteristics compared to the original 20-SSOP package. Propagation delay of 27ns at 6V with 50pF load is within acceptable tolerance of the original 26ns specification.

For Extended Temperature Range Requirements: SN74HC273QPWRG4Q1 and SN74HC273QPWRQ1 both support the full -40°C to 125°C operating temperature range matching the original part. Both are active products from Texas Instruments with ROHS3 compliance. SN74HC273QPWRG4Q1 carries MSL 1 rating, while SN74HC273QPWRQ1 carries MSL 3 rating. Selection depends on storage and handling environment requirements.

For Package-Compatible Substitution: SN74HC273DBR maintains the original 20-SSOP package footprint, eliminating PCB layout modifications. It is an active product from Texas Instruments with ROHS3 compliance and MSL 1 rating. Operating temperature range is -40°C to 85°C, which is narrower than the original specification.

For Performance-Optimized Substitution: MM74HC273MTCX from Fairchild Semiconductor offers the fastest propagation delay at 23ns at 6V with 50pF load and operates at 78 MHz clock frequency. However, operating temperature range is limited to -40°C to 85°C, and RoHS compliance status is not specified in available data.

Discontinued Parts: SN74HC273PW and SN74HC273PWT are discontinued at DiGi Electronics and should not be selected for new designs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC273PWR as a direct replacement for 74HC273DB,112 on existing PCBs?

A: SN74HC273PWR is functionally equivalent but uses a different package. The original 74HC273DB,112 is in 20-SSOP (0.209", 5.30mm width), while SN74HC273PWR is in 20-TSSOP (0.173", 4.40mm width). Both are 20-pin surface mount packages with identical pin assignments, but the TSSOP package is narrower. PCB layout modification is required if the original footprint was designed specifically for SSOP dimensions. Pin compatibility is maintained.

Q: What is the difference between MSL 1 and MSL 3 ratings?

A: MSL 1 (Moisture Sensitivity Level 1) allows unlimited storage time before soldering without baking requirements. MSL 3 requires components to be soldered within 168 hours of package opening, or the component must be baked to remove absorbed moisture. For high-volume production with extended storage periods, MSL 1 rated parts such as SN74HC273PWR are preferred to eliminate baking procedures.

Q: Does the 1ns difference in propagation delay between 74HC273DB,112 (26ns) and substitute parts (27ns) affect circuit timing?

A: The 1ns difference is within typical design margins for 74HC series logic operating at 60-122 MHz. Circuit timing impact depends on the specific application's timing budget. For critical timing paths, verify that the substitute part's maximum propagation delay of 27ns at 6V with 50pF load meets system requirements. The original part's 26ns specification provides minimal additional margin.

Q: Why does MM74HC273MTCX show faster propagation delay (23ns) than other substitutes?

A: MM74HC273MTCX achieves 23ns propagation delay at 6V with 50pF load, which is faster than the original 26ns specification. This represents improved performance and is acceptable for substitution. However, the operating temperature range is limited to -40°C to 85°C compared to the original -40°C to 125°C, which may restrict use in high-temperature applications.

Q: Are all substitute parts RoHS3 compliant?

A: SN74HC273QPWRG4Q1, SN74HC273QPWRQ1, SN74HC273DBR, and SN74HC273PWR are confirmed ROHS3 compliant. MM74HC273MTCX does not specify RoHS compliance status in available documentation. For applications requiring RoHS3 certification, select from the Texas Instruments or Nexperia parts with confirmed compliance.

Q: What is the inventory status of substitute parts?

A: SN74HC273PWR has the highest inventory availability at 300,300 pieces. SN74HC273QPWRQ1 has 6,773 pieces. SN74HC273DBR has 1,900 pieces. SN74HC273QPWRG4Q1 has 697 pieces. MM74HC273MTCX has 2,800 pieces. For high-volume procurement, SN74HC273PWR is the most readily available option.