STM812SW16F Equivalent & Substitute Parts

Part Overview

The STM812SW16F is an active-high reset supervisor integrated circuit manufactured by STMicroelectronics, designed for power management and system reset applications. This single-channel supervisor operates as a push-pull, totem-pole output device in a surface-mount SOT-143-4 package. The device monitors a single voltage threshold at 2.93V and provides a 140ms minimum reset timeout, making it suitable for microcontroller and processor reset sequencing in embedded systems.

The STM812SW16F maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent substitute parts are available from multiple manufacturers including Analog Devices Inc., Diodes Incorporated, and Microchip Technology, each offering identical electrical and mechanical specifications while differing in packaging configurations and inventory availability.

Key Parameters

Parameter	Value
Manufacturer	STMicroelectronics
Part Number	STM812SW16F
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	2.93V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active High
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-253-4, TO-253AA
Supplier Device Package	SOT-143-4
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the STM812SW16F is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Single voltage monitoring channel
2.93V threshold voltage
Push-pull, totem-pole output configuration
Active-high reset logic
140ms minimum reset timeout
Operating temperature range of -40°C to 85°C

Mechanical Equivalence Criteria:

Surface-mount technology
TO-253-4 or TO-253AA package footprint
SOT-143-4 or SOT-143 supplier device package designation

Compliance Equivalence Criteria:

RoHS3 compliance
MSL Level 1 (unlimited moisture sensitivity)
REACH unaffected status
Active product status

All substitute parts listed below meet these criteria without exception. Packaging format differences (Cut Tape vs. Tape & Reel) do not affect electrical or mechanical compatibility and represent only supply chain and handling variations.

Parameter Comparison

Parameter	STM812SW16F (STMicroelectronics)	ADM812SARTZ-REEL (Analog Devices)	ADM812SARTZ-REEL7 (Analog Devices)	APX812-29UG-7 (Diodes Inc.)	MAX812SEUS+T (Analog Devices/Maxim)	MIC812SUY-TR (Microchip)
Voltage Threshold	2.93V	2.93V	2.93V	2.93V	2.93V	2.93V
Output Type	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole
Reset Logic	Active High	Active High	Active High	Active High	Active High	Active High
Reset Timeout	140ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	TO-253-4, TO-253AA	TO-253-4, TO-253AA	TO-253-4, TO-253AA	TO-253-4, TO-253AA	TO-253-4, TO-253AA	TO-253-4, TO-253AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are direct parametric equivalents to the STM812SW16F and are suitable for drop-in replacement in applications requiring a single-channel power-on reset supervisor with 2.93V threshold monitoring.

Selection Considerations Based on Provided Data:

Inventory Availability: APX812-29UG-7 (Diodes Incorporated) offers the highest inventory level at 36,200 units. ADM812SARTZ-REEL (Analog Devices) provides 6,876 units in Tape & Reel packaging. MIC812SUY-TR (Microchip Technology) maintains 3,708 units. MAX812SEUS+T (Analog Devices/Maxim Integrated) has the lowest inventory at 1,320 units.

Packaging Format: The STM812SW16F is supplied in Cut Tape & Digi-Reel format. ADM812SARTZ-REEL7 matches this packaging configuration. ADM812SARTZ-REEL, APX812-29UG-7, MAX812SEUS+T, and MIC812SUY-TR are supplied in Tape & Reel format, which is compatible with automated assembly equipment but differs in handling and storage characteristics.

Regulatory Compliance: All substitute parts maintain identical RoHS3 compliance, MSL Level 1 rating, and REACH unaffected status, ensuring no regulatory or environmental qualification barriers to substitution.

Manufacturer Diversity: Substitutes are available from four manufacturers: Analog Devices Inc. (ADM812 and MAX812 series), Diodes Incorporated (APX812 series), and Microchip Technology (MIC812 series), providing supply chain flexibility and alternative sourcing options.

Frequently Asked Questions (FAQ)

Q: Can the ADM812SARTZ-REEL be used as a direct replacement for the STM812SW16F?

A: Yes. The ADM812SARTZ-REEL is a parametric equivalent with identical voltage threshold (2.93V), output configuration (push-pull, totem-pole), reset logic (active high), reset timeout (140ms minimum), operating temperature range (-40°C to 85°C), and package footprint (TO-253-4, TO-253AA). The only difference is the packaging format (Tape & Reel vs. Cut Tape & Digi-Reel), which does not affect electrical or mechanical compatibility.

Q: What is the difference between ADM812SARTZ-REEL and ADM812SARTZ-REEL7?

A: Both parts are manufactured by Analog Devices with identical electrical specifications. The primary difference is packaging format: ADM812SARTZ-REEL is supplied in Tape & Reel format, while ADM812SARTZ-REEL7 is supplied in Cut Tape & Digi-Reel format, matching the original STM812SW16F packaging configuration.

Q: Are all substitute parts suitable for the same PCB footprint as the STM812SW16F?

A: Yes. All substitute parts use the same package designation (TO-253-4 or TO-253AA) and SOT-143-4 or SOT-143 supplier device package, ensuring identical PCB footprint compatibility without layout modifications.

Q: Do the substitute parts have the same compliance certifications as the STM812SW16F?

A: Yes. All substitute parts are RoHS3 compliant, carry MSL Level 1 (unlimited) moisture sensitivity rating, and maintain REACH unaffected status, matching the regulatory profile of the STM812SW16F.

Q: Which substitute part has the best inventory availability?

A: The APX812-29UG-7 manufactured by Diodes Incorporated has the highest inventory level at 36,200 units in stock.

Q: Can I use MAX812SEUS+T in a design originally specified for STM812SW16F?

A: Yes. The MAX812SEUS+T is a parametric equivalent with all critical electrical and mechanical specifications matching the STM812SW16F, including voltage threshold, output configuration, reset timing, and package footprint. It is supplied in Tape & Reel format rather than Cut Tape & Digi-Reel.

Q: What is the significance of the 2.93V voltage threshold in selecting a substitute?

A: The 2.93V threshold is the voltage level at which the supervisor monitors the power supply and initiates reset sequencing. All substitute parts must maintain this exact threshold to ensure proper system reset timing and power-on sequencing. Deviations from this specification would result in incompatible reset behavior.

Q: Are there any temperature range differences between the STM812SW16F and its substitutes?

A: No. All substitute parts operate across the identical temperature range of -40°C to 85°C (TA), ensuring equivalent thermal performance and reliability across all environmental conditions.

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