1PMT40AT1 Equivalent & Substitute Parts

Part Overview

The 1PMT40AT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component features a 40V reverse standoff voltage with a 64.5V maximum clamping voltage and 1000W peak pulse power rating in a surface-mount Powermite package. The part is currently classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	1PMT40AT1
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Power - Peak Pulse	1000W (1kW)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-216AA
Supplier Device Package	Powermite
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

The 1PMT40AT1 operates at a 40V reverse standoff voltage with 64.5V clamping characteristics. Direct substitutes from the Microchip Technology UPT series are not available at the 40V rating level. The substitute parts listed operate at lower voltage ratings (10V, 12V, and 15V standoff voltages) and are therefore not electrically equivalent for the same protection threshold application.

Substitution logic is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must match application requirements
Voltage - Clamping (Max) @ Ipp: Determines maximum transient suppression level
Power - Peak Pulse: Must support the same energy dissipation capability
Package / Case: DO-216AA compatibility for mechanical fit
Unidirectional Channels: Single channel configuration

The listed Microchip Technology parts (UPT10, UPT12, UPT15 series) share identical packaging (DO-216AA Powermite), mounting type (surface mount), and power rating (1000W), but operate at significantly lower voltage ratings and are suitable only for applications requiring lower voltage protection thresholds.

Parameter Comparison

Parameter	1PMT40AT1	UPT10/TR13	UPT10/TR7	UPT10E3/TR13	UPT10RE3/TR7	UPT12/TR13	UPT12/TR7	UPT12E3/TR13	UPT12RE3/TR7	UPT15/TR13	UPT15/TR7
Manufacturer	onsemi	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip
Voltage - Reverse Standoff (Typ)	40V	10V	10V	10V	10V	12V	12V	12V	12V	15V	15V
Voltage - Breakdown (Min)	44.4V	11V	11V	11V	11V	13.8V	13.8V	13.8V	13.8V	16.7V	16.7V
Voltage - Clamping (Max) @ Ipp	64.5V	18V	18V	18V	18V	21.6V	21.6V	21.6V	21.6V	26V	26V
Power - Peak Pulse	1000W	1000W	1000W	1000W	1000W	1000W	1000W	1000W	150W	1000W	1000W
Operating Temperature	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA	DO-216AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1	1	1	1	1	1	1
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

The 1PMT40AT1 is an obsolete component with no direct electrical equivalent in the active Microchip Technology UPT series. The substitute parts listed operate at lower voltage ratings and cannot provide equivalent protection for 40V standoff applications.

For applications currently using the 1PMT40AT1, component selection must be based on actual circuit voltage requirements:

If the application requires 40V standoff voltage protection, alternative sources outside the provided substitute list must be evaluated, as no active equivalent exists in the UPT series at this voltage rating.

If the application can operate with lower voltage protection thresholds, the UPT series parts offer active product status and improved compliance options. Among the listed substitutes, parts with ROHS3 Compliant designation (UPT10E3/TR13, UPT10RE3/TR7, UPT12E3/TR13, UPT12RE3/TR7) provide enhanced regulatory compliance compared to the original obsolete part.

The UPT12RE3/TR7 variant shows reduced peak pulse power (150W versus 1000W) and should not be selected for applications requiring full 1000W dissipation capability.

Frequently Asked Questions (FAQ)

Q: Can UPT10, UPT12, or UPT15 series parts directly replace the 1PMT40AT1?

A: No. The 1PMT40AT1 operates at 40V reverse standoff voltage, while the UPT series substitutes operate at 10V, 12V, and 15V respectively. These parts are not electrically equivalent and will not provide the same overvoltage protection threshold. Substitution is only valid if the application circuit voltage requirements are lower than the original design specification.

Q: What is the difference between UPT10/TR13 and UPT10E3/TR13?

A: Both parts share identical electrical specifications (10V standoff, 18V clamping, 1000W power rating) and packaging. The primary difference is RoHS compliance status: UPT10E3/TR13 is ROHS3 Compliant, while UPT10/TR13 is RoHS non-compliant. The E3 designation indicates enhanced environmental compliance.

Q: Why is UPT12RE3/TR7 listed if it has reduced power rating?

A: UPT12RE3/TR7 is included in the substitute list but operates at 150W peak pulse power versus the 1000W rating of the 1PMT40AT1 and other UPT variants. This part is suitable only for applications with lower energy transient requirements and should not be selected for designs requiring full 1000W dissipation.

Q: Are all substitute parts available in the same DO-216AA package?

A: Yes. All listed substitute parts use the DO-216AA Powermite package, ensuring mechanical compatibility with the original 1PMT40AT1 footprint. Surface-mount assembly processes remain unchanged.

Q: What is the difference between TR7 and TR13 packaging designations?

A: TR7 and TR13 refer to different tape and reel configurations for surface-mount component delivery. Both designations indicate Tape & Reel packaging but with different reel specifications. The electrical performance of the TVS diode itself is identical; the difference is in supply format and quantity per reel.

Q: Should I select a ROHS3 Compliant part if my application does not require it?

A: ROHS3 Compliant parts (E3 and RE3 variants) offer improved environmental compliance and are recommended for new designs and long-term production support. However, selection should be based on application requirements and regulatory obligations. Both compliant and non-compliant variants maintain identical electrical performance.

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