HEMT-3301 Equivalent & Substitute Parts

Part Overview

The HEMT-3301 is an infrared (IR) emitter operating at 940nm wavelength with a maximum forward current of 100mA and typical forward voltage of 1.15V. This component is designed for radial through-hole mounting in a 5mm diameter package (T 1 3/4 form factor). The HEMT-3301 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 940nm wavelength specification, radial package configuration, and through-hole mounting requirements while meeting current electrical specifications.

Substiute Parts

HEMT-3301

Broadcom LimitedIn Stock: 940HEMT-3301 Datasheet

Current PartRFQ

QED234

onsemiIn Stock: 17738QED234 Datasheet

MFR RecommendedRFQ

WP7113F3C

KingbrightIn Stock: 1719WP7113F3C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HEMT-3301 are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Wavelength: 940nm (exact match required)
• Package / Case: Radial, 5mm Dia (T 1 3/4) or compatible radial configuration
• Mounting Type: Through Hole
• Current - DC Forward (If) Max: 100mA or greater
• Operating Temperature Range: Must encompass or match -40°C ~ 100°C

Secondary Electrical Parameters:

• Voltage - Forward (Vf): Acceptable range based on circuit design tolerance
• Radiant Intensity (Ie): Output power specification for application requirements
• Viewing Angle: Beam width specification for optical design

Substitute parts are grouped by their ability to meet these criteria within the constraints of standard component availability and active product status.

Parameter Comparison

Engineering Selection Recommendations

QED234 (onsemi) - Primary Substitute

The QED234 is the recommended substitute for direct replacement applications. It maintains the 940nm wavelength, 100mA maximum forward current rating, and identical package configuration (Radial, 5mm Dia T 1 3/4). The QED234 operates across the same temperature range (-40°C ~ 100°C) and is classified as an active product with ROHS3 compliance. The forward voltage specification of 1.6V (Max) is higher than the HEMT-3301 typical value of 1.15V; circuit designs must accommodate this voltage differential. The radiant intensity of 27mW/sr @ 100mA exceeds the HEMT-3301 specification, providing improved optical output. The viewing angle of 40° is narrower than the original 50°, which may affect beam width in optical designs.

WP7113F3C (Kingbright) - Limited Compatibility Substitute

The WP7113F3C is a secondary substitute option with significant electrical differences. This part maintains the 940nm wavelength and radial through-hole package configuration but has a maximum forward current rating of 50mA, which is 50% lower than the HEMT-3301. The operating temperature range extends only to 85°C, which does not fully cover the original -40°C ~ 100°C specification. The WP7113F3C is suitable only for applications where the 50mA current limitation and reduced temperature range are acceptable. This part is classified as active with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can QED234 be used as a direct replacement for HEMT-3301?

A: The QED234 is mechanically and functionally compatible for most applications. Both parts share the same 940nm wavelength, 100mA maximum current rating, and identical package configuration. However, the forward voltage differs (1.6V Max vs. 1.15V Typ), requiring circuit verification to ensure the higher voltage does not exceed design tolerances. The narrower viewing angle (40° vs. 50°) may affect optical beam width in precision applications.

Q: Is WP7113F3C suitable for all HEMT-3301 applications?

A: No. The WP7113F3C has a maximum forward current of 50mA, which is insufficient for applications requiring the full 100mA capability of the HEMT-3301. Additionally, the operating temperature range (-40°C ~ 85°C) does not extend to the upper limit of the original specification (100°C). Use WP7113F3C only in applications where these reduced specifications are acceptable.

Q: What are the critical parameters for substitution?

A: The critical parameters are wavelength (940nm), package type (radial through-hole, 5mm diameter), and maximum forward current rating. The forward voltage, radiant intensity, and viewing angle are secondary parameters that must be evaluated based on specific circuit and optical design requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both QED234 and WP7113F3C are ROHS3 compliant. The HEMT-3301 RoHS status is not specified in the available documentation.

Q: What is the difference in radiant intensity between the parts?

A: The HEMT-3301 provides 2.5mW/sr @ 20mA, the QED234 provides 27mW/sr @ 100mA, and the WP7113F3C provides 15mW/sr @ 30mA. These measurements are taken at different current levels, making direct comparison necessary only when evaluating specific application requirements for optical output power.