DS1231S-20 Equivalent & Substitute Parts

Part Overview

The DS1231S-20 is a supervisor integrated circuit from Analog Devices Inc./Maxim Integrated, classified as a Power Management PMIC. This device functions as a simple reset/power-on reset supervisor with open drain or open collector output, monitoring a single voltage channel. The DS1231S-20 is currently listed as obsolete, making identification of functionally equivalent active alternatives essential for new designs and ongoing production requirements. Substitute parts must maintain identical electrical characteristics, package specifications, and functional behavior to ensure direct compatibility in existing circuit implementations.

Substiute Parts

DS1231S-20

Analog Devices Inc./Maxim IntegratedIn Stock: 2059DS1231S-20 Datasheet

Current PartRFQ

DS1231S-20+

Analog Devices Inc./Maxim IntegratedIn Stock: 1521DS1231S-20+ Datasheet

DirectRFQ

DS1231S-35+

Analog Devices Inc./Maxim IntegratedIn Stock: 1102DS1231S-35+ Datasheet

Parametric EquivalentRFQ

DS1231S-50+

Analog Devices Inc./Maxim IntegratedIn Stock: 1183DS1231S-50+ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1231S-20 is determined by strict equivalence across the following critical parameters:

• Voltage Threshold Specifications: All substitute parts must maintain identical threshold voltages of 4.37V and 4.62V
• Output Configuration: Open drain or open collector output is mandatory
• Reset Characteristics: Active high/active low reset capability with 150ms minimum timeout
• Single Channel Monitoring: Supervisor function limited to one voltage channel
• Package Compatibility: 16-SOIC surface mount package with identical physical dimensions (0.295", 7.50mm width)
• Electrical Performance: Operating temperature range of 0°C ~ 70°C and MSL rating of 1

The substitute parts DS1231S-20+, DS1231S-35+, and DS1231S-50+ meet all these criteria and are functionally interchangeable with the obsolete DS1231S-20. These variants share the same base product number (DS1231) and differ only in product status and compliance certifications, not in electrical or mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete DS1231S-20, direct substitution with DS1231S-20+ is the primary recommendation. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance, eliminating regulatory and supply chain concerns associated with obsolete components.

DS1231S-35+ and DS1231S-50+ are functionally equivalent alternatives that provide identical performance characteristics. Selection between these three active variants should be based on inventory availability and procurement lead times, as all three parts are electrically and mechanically interchangeable.

The transition from the non-compliant DS1231S-20 to any of the ROHS3-compliant active variants (DS1231S-20+, DS1231S-35+, or DS1231S-50+) aligns with current regulatory requirements and ensures long-term component availability for production and field service applications.

Frequently Asked Questions (FAQ)

Q: Can DS1231S-20+ be used as a direct replacement for DS1231S-20?

A: Yes. DS1231S-20+ is electrically and mechanically identical to DS1231S-20. The primary differences are product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). No circuit modifications are required.

Q: What is the difference between DS1231S-20+, DS1231S-35+, and DS1231S-50+?

A: All three parts share identical electrical specifications, voltage thresholds, output configurations, and package dimensions. The designations reflect different product variants within the DS1231 family, but they are functionally equivalent for applications requiring single-channel voltage supervision with 4.37V and 4.62V thresholds.

Q: Are these parts pin-compatible?

A: Yes. All substitute parts use the 16-SOIC package with identical pinout and physical dimensions (0.295", 7.50mm width). Direct PCB substitution is possible without layout modifications.

Q: What packaging options are available for the substitute parts?

A: DS1231S-20+, DS1231S-35+, and DS1231S-50+ are supplied in tube packaging. The original DS1231S-20 packaging format is not specified in the available data.

Q: Are there any compliance differences between the substitute parts?

A: All active substitute parts (DS1231S-20+, DS1231S-35+, DS1231S-50+) are ROHS3 compliant and REACH unaffected. The original DS1231S-20 is RoHS non-compliant. For new designs and regulatory compliance, the active variants are required.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The electrical performance, voltage monitoring thresholds, reset timeout characteristics, and operating temperature range are identical across all variants. Existing circuit designs require no modification for substitution.