SN74LS109ADRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS109ADRE4 is a dual JK-type flip-flop logic integrated circuit manufactured by Texas Instruments in the 74LS series. This component features two independent 1-bit JK flip-flops with complementary outputs, positive edge triggering, and set/reset functionality. The device is packaged in a 16-SOIC surface mount configuration with a maximum clock frequency of 33 MHz and operates across the standard 4.75V to 5.25V supply voltage range.

The SN74LS109ADRE4 is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

SN74LS109ADRE4

Texas InstrumentsIn Stock: 699SN74LS109ADRE4 Datasheet

Current PartRFQ

SN74LS109ADR

Texas InstrumentsIn Stock: 3365SN74LS109ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS109ADRE4 is determined by strict equivalence across the following critical parameters:

• Logic Function: Dual JK-type flip-flop with complementary outputs and positive edge triggering
• Package Type: 16-SOIC surface mount configuration with identical pin pitch and dimensions (0.154", 3.90mm Width)
• Electrical Specifications: Supply voltage range (4.75V ~ 5.25V), quiescent current (8 mA), and output current ratings (400µA, 8mA)
• Timing Characteristics: Clock frequency capability (33 MHz) and propagation delay performance
• Compliance Standards: RoHS3 compliance, REACH unaffected status, and MSL rating (1 - Unlimited)

The SN74LS109ADR qualifies as a direct substitute based on identical functional specifications, package configuration, and compliance certifications. The primary difference is product status and packaging format (Tape & Reel vs. individual unit packaging).

Parameter Comparison

Engineering Selection Recommendations

The SN74LS109ADR is the direct substitute for the SN74LS109ADRE4. Both components are manufactured by Texas Instruments and share identical functional specifications, electrical characteristics, and package configuration. The SN74LS109ADR maintains active product status, ensuring continued availability and supply chain reliability.

The propagation delay specification of the SN74LS109ADR (40ns @ 5V, 15pF) is slightly higher than the main part (25ns @ 5V, 15pF), but both operate within the same 33 MHz clock frequency specification and are suitable for equivalent timing-critical applications within the 74LS logic family performance envelope.

Both parts maintain full RoHS3 compliance and REACH unaffected status, supporting regulatory requirements for modern electronic equipment manufacturing. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS109ADR be used as a direct replacement for the SN74LS109ADRE4?

A: Yes. Both components are identical in function, electrical specifications, and package configuration. The primary difference is product status (active vs. discontinued) and packaging format (Tape & Reel vs. individual unit). Pin-for-pin compatibility is guaranteed.

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

A: The SN74LS109ADRE4 specifies 25ns maximum propagation delay at 5V with 15pF load, while the SN74LS109ADR specifies 40ns under identical conditions. Both operate within the 33 MHz clock frequency specification. The difference does not affect functional compatibility in standard 74LS logic applications.

Q: Are there any compliance or regulatory differences?

A: No. Both parts maintain identical RoHS3 compliance, REACH unaffected status, and MSL rating (1 - Unlimited). No additional certifications or compliance considerations apply to the substitution.

Q: What packaging formats are available?

A: The SN74LS109ADRE4 is supplied as individual units. The SN74LS109ADR is supplied in Tape & Reel (TR) format. Both use the 16-SOIC surface mount package with identical pin pitch and dimensions (0.154", 3.90mm Width).

Q: Is the SN74LS109ADR currently available?

A: Yes. The SN74LS109ADR maintains active product status with documented inventory availability, unlike the discontinued SN74LS109ADRE4.