DS1231S-35+ Equivalent & Substitute Parts

Part Overview

The DS1231S-35+ is an active Power Management integrated circuit (PMIC) supervisor manufactured by Analog Devices Inc./Maxim Integrated. This device functions as a simple reset/power-on reset supervisor with open drain or open collector output configuration, designed for single-channel voltage monitoring applications. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling direct replacement in circuit designs without functional compromise.

Key Parameters

Parameter	Value
Manufacturer Part Number	DS1231S-35+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	4.37V, 4.62V
Output Configuration	Open Drain or Open Collector
Reset Type	Active High/Active Low
Reset Timeout	150ms Minimum
Operating Temperature Range	0°C ~ 70°C (TA)
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the DS1231S-35+ are identified based on strict parameter equivalence within the DS1231 product family. All substitute candidates maintain identical electrical specifications across the following critical parameters:

Single-channel voltage monitoring architecture
Voltage threshold levels: 4.37V and 4.62V
Open drain or open collector output configuration
Active high/active low reset capability
150ms minimum reset timeout
Operating temperature range: 0°C to 70°C
16-SOIC surface mount package (0.295", 7.50mm width)
RoHS3 compliance and MSL 1 rating

The DS1231S-35+, DS1231S-20+, and DS1231S-50+ variants represent parametric equivalents within the DS1231 supervisor family. These part numbers differ only in manufacturing date codes or internal lot designations, not in functional or electrical characteristics. All three parts are manufactured by Analog Devices Inc./Maxim Integrated and share identical performance specifications for voltage monitoring, reset timing, and output behavior.

Parameter Comparison

Parameter	DS1231S-35+	DS1231S-20+	DS1231S-50+
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Type	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset
Number of Voltages Monitored	1	1	1
Voltage Threshold	4.37V, 4.62V	4.37V, 4.62V	4.37V, 4.62V
Output Configuration	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector
Reset Type	Active High/Active Low	Active High/Active Low	Active High/Active Low
Reset Timeout	150ms Minimum	150ms Minimum	150ms Minimum
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active
Packaging	Tube	Tube	Tube
Inventory Availability	1053 Pcs New Original In Stock	1420 Pcs New Original In Stock	1140 Pcs New Original In Stock

Engineering Selection Recommendations

All three substitute parts—DS1231S-35+, DS1231S-20+, and DS1231S-50+—are qualified for direct substitution based on identical electrical and mechanical specifications. Selection among these equivalents may be determined by:

Inventory availability and lead time requirements
Manufacturing lot or date code preferences for traceability
Supply chain logistics and packaging quantities

All substitute parts maintain active production status with full RoHS3 compliance and REACH unaffected designation. Moisture sensitivity level (MSL 1) provides unlimited shelf life without special storage requirements. ECCN classification (EAR99) and HTSUS code (8542.39.0001) are consistent across all variants, ensuring regulatory and customs compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can DS1231S-20+ or DS1231S-50+ be used as direct replacements for DS1231S-35+?

A: Yes. All three part numbers are parametric equivalents with identical voltage thresholds (4.37V, 4.62V), reset timeout (150ms minimum), output configuration (open drain or open collector), and 16-SOIC package specifications. No circuit modifications are required.

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

A: These part numbers represent variants within the DS1231 supervisor family with identical electrical and mechanical specifications. Differences relate to manufacturing date codes or internal lot designations, not functional performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. DS1231S-35+, DS1231S-20+, and DS1231S-50+ are all ROHS3 compliant with MSL 1 rating (unlimited moisture sensitivity), REACH unaffected status, and EAR99 ECCN classification.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. All substitute parts use identical 16-SOIC surface mount packaging (0.295", 7.50mm width) with the same pin configuration, footprint, and mounting requirements. No PCB redesign is necessary.

Q: What is the operating temperature range for these supervisors?

A: The operating temperature range is 0°C to 70°C (TA) for all three part variants.

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

A: No. All three parts share identical RoHS3 compliance, REACH unaffected status, ECCN (EAR99), and HTSUS (8542.39.0001) classifications.

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