PM3GT LED Panel Indicator - Equivalent & Substitute Parts

Part Overview

The PM3GT is a 3mm LED panel indicator manufactured by Bivar Inc., designed for applications requiring a green light source with clear lens transparency. This component features a 568nm peak wavelength, 40mcd brightness rating, and operates at 2.1V with a maximum current of 30mA. The PM3GT is classified as obsolete, necessitating identification of functionally compatible substitute components for ongoing design support and procurement requirements.

Substiute Parts

PM3GT

Bivar Inc.In Stock: 862PM3GT Datasheet

Current PartRFQ

PM3GD

Bivar Inc.In Stock: 1306PM3GD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PM3GT is determined by strict alignment across critical electrical, optical, and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters (Must Match):

• Forward Voltage (Vf): 2.1V
• Maximum Current (If): 30mA

Optical Parameters (Must Match):

• Lamp Color: Green
• Peak Wavelength: 568nm

Mechanical Parameters (Must Match):

• Lens Size: 3mm, T-1
• Panel Cutout Shape: Round
• Panel Cutout Dimensions: 0.16" (4.06mm)
• Lens Style: Round with Domed Top

Parameters Permitted to Vary:

• Lens Transparency (Clear vs. Diffused)
• Viewing Angle
• Millicandela Rating (within same product family)
• Termination Style
• Packaging configuration

The PM3GD meets all mandatory matching criteria and is classified as a valid substitute despite differences in lens transparency and brightness rating.

Parameter Comparison

Engineering Selection Recommendations

PM3GD as Primary Substitute:

The PM3GD is the designated substitute for the obsolete PM3GT. This substitution is supported by:

1. Electrical Compatibility: Identical forward voltage (2.1V) and maximum current rating (30mA) ensure direct circuit compatibility without modification to current-limiting resistor calculations or power supply specifications.

2. Optical Compatibility: Matching lamp color (Green) and peak wavelength (568nm) maintain color consistency in multi-indicator applications. The PM3GD operates at 25mcd versus the PM3GT's 40mcd; this represents a reduction in brightness output.

3. Mechanical Compatibility: Identical lens size (3mm, T-1), panel cutout shape (Round), and panel cutout dimensions (0.16"/4.06mm) ensure direct mechanical fit in existing panel assemblies without modification to mounting hardware or cutout tooling.

4. Product Status: The PM3GD holds Active product status with current manufacturing support, ensuring long-term availability and supply chain continuity.

5. Regulatory Compliance: Both components share identical ECCN (EAR99), HTSUS classification (8541.41.0000), and MSL rating (1 - Unlimited), maintaining compliance with export control and moisture handling requirements.

Design Consideration - Lens Transparency Difference:

The PM3GD features diffused lens transparency compared to the PM3GT's clear lens. This difference affects light distribution characteristics: the diffused lens provides a wider viewing angle (40° vs. 30°) with more uniform light distribution across the viewing cone, while the clear lens concentrates light output within a narrower angle. Application requirements determine whether this change is acceptable.

Frequently Asked Questions (FAQ)

Q: Can PM3GD directly replace PM3GT in existing designs?

A: The PM3GD meets all mandatory electrical and mechanical compatibility criteria for direct substitution. The primary design consideration is the change from clear to diffused lens transparency, which alters light distribution characteristics. Verify that the wider viewing angle (40° vs. 30°) and diffused light pattern are acceptable for the intended application.

Q: What is the brightness difference between PM3GT and PM3GD?

A: The PM3GT operates at 40mcd while the PM3GD operates at 25mcd. This represents a 37.5% reduction in peak brightness. Applications requiring specific minimum brightness levels must evaluate whether the PM3GD's output is sufficient.

Q: Are there electrical circuit modifications required when substituting PM3GD for PM3GT?

A: No. Both components operate at identical forward voltage (2.1V) and maximum current (30mA). Current-limiting resistor values and power supply specifications remain unchanged.

Q: What is the mechanical fit compatibility?

A: Both components feature identical panel cutout dimensions (0.16"/4.06mm), lens size (3mm, T-1), and lens style (Round with Domed Top). No modifications to panel cutouts, mounting hardware, or mechanical assemblies are required.

Q: Does the PM3GD have the same regulatory compliance as PM3GT?

A: Yes. Both components share identical ECCN (EAR99), HTSUS classification (8541.41.0000), and MSL rating (1 - Unlimited). No changes to compliance documentation or export procedures are necessary.

Q: What is the difference between clear and diffused lens transparency?

A: Clear lens transparency concentrates light output within a narrow viewing angle (30° for PM3GT), producing a focused, bright spot. Diffused lens transparency scatters light across a wider viewing angle (40° for PM3GD), producing more uniform illumination with lower peak intensity at the center. Application visibility requirements determine which is appropriate.

Q: Is PM3GD currently available?

A: Yes. PM3GD holds Active product status with 1274 pieces in current inventory. The PM3GT is classified as Obsolete with no ongoing manufacturing support.

Q: What is the termination difference between PM3GT and PM3GD?

A: PM3GT termination style is not specified in available documentation. PM3GD features PC Pin termination. Verify compatibility with existing solder or connection methods before implementation.