TPS3820-33DBVT Equivalent & Substitute Parts

Part Overview

The TPS3820-33DBVT is a single-channel power management supervisor IC manufactured by Texas Instruments, designed for power-on reset and simple reset applications. This device features push-pull totem pole output configuration with a 2.93V voltage threshold and 15ms minimum reset timeout. The part is currently in Last Time Buy status, indicating end-of-life production. Alternative equivalent and substitute parts are necessary to ensure continued design support and long-term supply chain reliability for new designs and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	TPS3820-33DBVT
Manufacturer	Texas Instruments
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 Low
Reset Timeout	15ms Minimum
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the TPS3820-33DBVT is determined by the following critical parameters:

Primary Substitution Criteria (Must Match):

Single-channel voltage monitoring capability
Voltage threshold of 2.93V
Push-pull or totem pole output configuration
Active low reset logic
Surface mount packaging
RoHS3 compliance

Secondary Compatibility Factors:

Operating temperature range (-40°C to 85°C minimum)
Reset timeout characteristics
Moisture sensitivity level
Package footprint compatibility (SOT-23-5 or equivalent pinout)

The substitute parts listed below are grouped based on their alignment with these parameters. Parametric equivalents maintain identical electrical specifications and package compatibility. Manufacturer-recommended alternatives provide functional equivalence with acceptable variations in secondary parameters such as reset timeout duration or package form factor.

Parameter Comparison

Parameter	TPS3820-33DBVT	TPS3820-33DBVR	APX823-29W5G-7	BD87A34FVM-TR
Manufacturer	Texas Instruments	Texas Instruments	Diodes Incorporated	Rohm Semiconductor
Type	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Watchdog Circuit
Number of Voltages Monitored	1	1	1	1
Voltage - Threshold	2.93V	2.93V	2.93V	3.4V
Output Configuration	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Open Drain or Open Collector
Reset Logic	Active Low	Active Low	Active Low	Active Low
Reset Timeout	15ms Minimum	15ms Minimum	140ms Minimum	Adjustable/Selectable
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	8-VSSOP, 8-MSOP
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-25	8-MSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)
Product Status	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

TPS3820-33DBVR (Parametric Equivalent)

The TPS3820-33DBVR is the direct parametric equivalent from Texas Instruments. This part maintains identical electrical specifications, package configuration, and threshold voltage. The primary advantage is active product status with higher inventory availability (35,100 units in stock versus 1,520 units for the main part). This substitute is recommended for designs requiring exact electrical and mechanical compatibility with minimal redesign effort. Both parts are ROHS3 compliant with MSL 1 rating.

APX823-29W5G-7 (Functional Equivalent)

The APX823-29W5G-7 from Diodes Incorporated provides functional equivalence with identical voltage threshold (2.93V) and output configuration. The reset timeout is extended to 140ms minimum compared to 15ms for the main part. The package footprint remains compatible (SOT-25 versus SOT-23-5), though pin configuration should be verified for board layout compatibility. This part carries MSL 3 rating (168 hours) versus MSL 1 for the main part, requiring appropriate moisture control during storage and assembly. Active product status with 33,888 units in stock provides reliable supply chain support.

BD87A34FVM-TR (Alternative Topology)

The BD87A34FVM-TR from Rohm Semiconductor represents a functional alternative with different output topology (open drain/open collector versus push-pull totem pole) and higher voltage threshold (3.4V versus 2.93V). This part is classified as a watchdog circuit with adjustable/selectable reset timeout, providing greater flexibility for timing-critical applications. The extended operating temperature range (-40°C to 105°C) offers thermal margin beyond the main part specification. The 8-MSOP package requires PCB layout redesign. This substitute is suitable only for applications where the output topology change and voltage threshold difference are acceptable. Active product status with 17,270 units in stock ensures supply availability.

Frequently Asked Questions (FAQ)

Q: Can TPS3820-33DBVR be used as a direct drop-in replacement for TPS3820-33DBVT?

A: Yes. The TPS3820-33DBVR is a parametric equivalent with identical electrical specifications, voltage threshold (2.93V), output configuration (push-pull totem pole), reset logic (active low), and package (SOT-23-5). No circuit redesign is required. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What are the key differences between APX823-29W5G-7 and the main part?

A: The APX823-29W5G-7 maintains the same voltage threshold (2.93V) and output configuration but has a longer reset timeout (140ms versus 15ms). The package is SOT-25 instead of SOT-23-5, requiring verification of pin compatibility with existing board layouts. The MSL rating is 3 (168 hours) versus 1 (unlimited), necessitating controlled moisture storage conditions.

Q: Is BD87A34FVM-TR compatible with designs using TPS3820-33DBVT?

A: The BD87A34FVM-TR provides functional supervision capability but differs in critical parameters. The output is open drain/open collector rather than push-pull totem pole, the voltage threshold is 3.4V instead of 2.93V, and the package is 8-MSOP instead of SOT-23-5. Circuit redesign is required to accommodate these differences. This part is suitable only for applications where these parameter changes are acceptable.

Q: Why is the TPS3820-33DBVT in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer has discontinued production and is accepting final orders before end-of-life. This necessitates transition to active alternative parts for ongoing production and new designs. The TPS3820-33DBVR provides the most direct transition path.

Q: What moisture sensitivity considerations apply to these substitutes?

A: The TPS3820-33DBVT, TPS3820-33DBVR, and BD87A34FVM-TR all carry MSL 1 rating (unlimited moisture sensitivity level), requiring no special storage precautions. The APX823-29W5G-7 carries MSL 3 rating (168 hours), requiring storage in controlled humidity environments and baking before reflow soldering if moisture absorption limits are exceeded.

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

A: The TPS3820-33DBVR is directly interchangeable with no modifications. The APX823-29W5G-7 requires verification of pin compatibility and acceptance of extended reset timeout. The BD87A34FVM-TR requires circuit redesign due to output topology and threshold voltage differences. Qualification testing is recommended before production transition to any substitute part.

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