1PMT33AT1G Equivalent & Substitute Parts

Part Overview

The 1PMT33AT1G is a 33V Transient Voltage Suppressor (TVS) diode manufactured by onsemi in Powermite surface mount packaging. This unidirectional zener diode is designed for general-purpose transient voltage protection with a 53.3V maximum clamping voltage and 1000W peak pulse power rating. The part is currently obsolete, making equivalent substitute components necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	1PMT33AT1G
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V
Power - Peak Pulse	1000W (1kW)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-216AA
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 1PMT33AT1G is constrained by the following critical parameters:

Voltage Rating Compatibility: The 33V reverse standoff voltage and 53.3V clamping voltage define the protection threshold. Substitute parts must operate within the same voltage class to maintain circuit protection integrity.

Package Compatibility: The DO-216AA (Powermite) surface mount package is mandatory for PCB layout compatibility.

Electrical Characteristics: Peak pulse power (1000W), unidirectional operation (single channel), and zener type are fixed requirements.

Temperature Range: Operating temperature range of -55°C to 150°C must be maintained or exceeded.

The substitute parts listed below are Microchip Technology UPT series TVS diodes. These parts share identical packaging (DO-216AA Powermite), equivalent power ratings (1000W), and compatible temperature ranges. However, they operate at different voltage ratings (10V, 15V, and 17V standoff voltages). Selection depends on the specific voltage protection requirement of the target application.

Parameter Comparison

Parameter	1PMT33AT1G (Main)	UPT10 Series	UPT15 Series	UPT17 Series
Manufacturer	onsemi	Microchip Technology	Microchip Technology	Microchip Technology
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
Voltage - Reverse Standoff (Typ)	33V	10V	15V	17V
Voltage - Breakdown (Min)	36.7V	11V	16.7V	19V
Voltage - Clamping (Max) @ Ipp	53.3V	18V	26V	29.2V
Current - Peak Pulse (10/1000µs)	Not specified	8.33A	5.77A	5.14A
Power - Peak Pulse	1000W (1kW)	1000W (1kW)	1000W (1kW)	1000W (1kW)
Operating Temperature	-55°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-216AA	DO-216AA	DO-216AA	DO-216AA
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

For Direct Voltage Class Replacement: No Microchip UPT series part provides a direct 33V standoff voltage equivalent. The available UPT series covers 10V, 15V, and 17V ratings only.

Product Status Consideration: All Microchip UPT substitute options are Active products with ongoing manufacturing support, eliminating obsolescence risk associated with the 1PMT33AT1G.

Compliance Status: UPT10E3/TR13, UPT15E3/TR13, and UPT17E3/TR13 variants are ROHS3 Compliant. Standard UPT10/TR13, UPT10/TR7, UPT15/TR13, UPT15/TR7, UPT17/TR13, and UPT17/TR7 variants are RoHS non-compliant. Selection should align with target product RoHS requirements.

Packaging Variants: Microchip UPT series are available in TR13 (13-inch reel) and TR7 (7-inch reel) tape and reel configurations. Both packaging variants are electrically identical; selection depends on supply chain and inventory management requirements.

Temperature Range: All UPT series parts operate from -65°C to 150°C, exceeding the 1PMT33AT1G range of -55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can UPT10, UPT15, or UPT17 series parts directly replace the 1PMT33AT1G?

A: No. The 1PMT33AT1G operates at 33V standoff voltage, while available UPT series parts are rated at 10V, 15V, or 17V. Direct substitution is not possible due to voltage rating mismatch. Application-specific voltage protection requirements must be evaluated to select the appropriate UPT series rating.

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

A: TR13 and TR7 designations refer to tape and reel configurations with different reel diameters (13-inch and 7-inch respectively). Electrical and mechanical specifications are identical. Selection is based on supply chain logistics and production volume requirements.

Q: Are ROHS3 Compliant variants (E3 suffix) electrically equivalent to non-compliant variants?

A: Yes. The E3 suffix indicates ROHS3 compliance certification only. Electrical performance, voltage ratings, power dissipation, and temperature ranges are identical between compliant and non-compliant variants of the same base part number.

Q: Does the DO-216AA package ensure mechanical compatibility?

A: Yes. All listed substitute parts use the DO-216AA (Powermite) surface mount package, ensuring PCB footprint and reflow soldering compatibility with the original 1PMT33AT1G design.

Q: What is the inventory status of substitute parts?

A: All listed Microchip UPT series parts are in active production with current stock availability ranging from 661 to 1146 pieces, providing supply chain continuity for new designs and production support.

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