PMR4HD LED Panel Indicator Red 2V Equivalent & Substitute Parts

Part Overview

The PMR4HD is a red LED panel indicator manufactured by Bivar Inc., designed for 2V applications with a 150mA maximum current rating. This component features a diffused lens with 120° viewing angle and is housed in a rectangular PC pin termination package compatible with 0.22" x 0.14" panel cutouts.

The PMR4HD is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this indicator.

Substiute Parts

PMR4HD

Bivar Inc.In Stock: 1146PMR4HD Datasheet

Current PartRFQ

PMR4RD

Bivar Inc.In Stock: 978PMR4RD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the PMR4HD must satisfy the following criteria based on provided parameters:

Mechanical Compatibility:

• Panel cutout dimensions must be 0.22" x 0.14" (5.59mm x 3.56mm)
• Lens size must be 2.10mm x 4.00mm
• Lens style must be Rectangle with Flat Top
• Termination style must be PC Pin

Electrical Compatibility:

• Lamp color must be Red
• Lens transparency must be Diffused
• Viewing angle must be 120°
• Voltage (Vf Typ) must be within acceptable circuit operating range
• Current (If Max) must be compatible with existing power supply design

Operational Compatibility:

• Series designation should remain PMR4 for design consistency

The PMR4RD meets all mechanical and optical requirements. Electrical parameters differ within the PMR4 series specifications, requiring circuit-level evaluation for compatibility.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The PMR4RD is mechanically and optically compatible with the PMR4HD. Both components share identical panel cutout dimensions, lens geometry, and viewing characteristics within the PMR4 series.

Electrical Considerations:

The PMR4RD operates at 2.1V (0.1V higher) with a maximum current of 80mA (70mA lower than the PMR4HD). Circuit designs originally specified for the PMR4HD must be evaluated to confirm that the 2.1V forward voltage and 80mA maximum current rating are acceptable within existing power supply and current-limiting resistor configurations.

Optical Performance:

The PMR4RD produces 0.4mcd compared to the PMR4HD's 8mcd. This represents a significant reduction in brightness. The peak wavelength shifts from 625nm to 700nm, moving toward the red-infrared boundary. Applications requiring the original brightness level or specific wavelength characteristics may not be satisfied by this substitute.

Compliance and Availability:

The PMR4RD is classified as Active product status with ROHS3 compliance, ensuring ongoing availability and adherence to current environmental regulations. The PMR4HD's obsolete status makes the PMR4RD the primary available option within the PMR4 series for new procurement.

Recommendation Basis:

Selection of the PMR4RD as a substitute depends on circuit tolerance for the 0.1V voltage increase and acceptance of the reduced brightness and wavelength shift. Direct electrical and optical validation is required before implementation in production environments.

Frequently Asked Questions (FAQ)

Q: Can the PMR4RD be directly installed in place of the PMR4HD without any modifications?

A: Mechanical installation is direct—the panel cutout dimensions, lens size, and termination style are identical. However, electrical circuit validation is required. The 0.1V voltage difference and 70mA current reduction must be confirmed as acceptable within the existing circuit design before installation.

Q: What is the primary difference between the PMR4HD and PMR4RD?

A: The primary differences are electrical ratings (2V/150mA versus 2.1V/80mA) and optical output (8mcd versus 0.4mcd). Mechanically and optically (lens style, viewing angle, diffusion), both components are identical.

Q: Why is the PMR4RD's brightness significantly lower than the PMR4HD?

A: The PMR4RD is specified at 0.4mcd while the PMR4HD is specified at 8mcd. This is a design characteristic of these two variants within the PMR4 series. The reduced brightness may or may not be acceptable depending on application visibility requirements.

Q: Does the wavelength difference (625nm versus 700nm) affect compatibility?

A: The 75nm shift from 625nm to 700nm moves the PMR4RD's output toward the red-infrared spectrum. Applications with specific wavelength requirements or color-matching needs should evaluate whether this shift is acceptable. For general red indicator applications, the visual difference may be minimal.

Q: Is the PMR4RD RoHS compliant?

A: Yes, the PMR4RD is ROHS3 compliant. The PMR4HD's compliance status is not specified in available documentation.

Q: What is the inventory status of these components?

A: The PMR4HD has 1054 pieces in stock (obsolete status). The PMR4RD has 946 pieces in stock (active status). The PMR4RD's active status indicates ongoing manufacturing availability.

Q: Can I use the PMR4RD in a circuit designed for 150mA operation?

A: The PMR4RD's maximum current rating is 80mA. If the circuit is designed to supply 150mA, the PMR4RD cannot be used without circuit modification to reduce the current-limiting resistor value or power supply output.

Q: Are there any other substitutes available besides the PMR4RD?

A: Based on the provided substitute list, the PMR4RD is the identified equivalent part for the PMR4HD within Bivar Inc.'s product portfolio.