3HD-F Red Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The 3HD-F is a red diffused T-1 through-hole LED manufactured by Bivar Inc., configured for discrete indication applications with a 2V forward voltage and 30mcd luminous intensity at 20mA test current. This is an active product with ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are required when primary availability is limited, specific forward voltage requirements differ for circuit integration, or luminous intensity specifications necessitate alternative optical characteristics.

Key Parameters

Parameter	3HD-F Value
Manufacturer	Bivar Inc.
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Mounting Type	Through Hole
Voltage - Forward (Vf) Typ	2V
Current - Test	20mA
Millicandela Rating	30mcd
Lens Style	Round with Domed Top
Viewing Angle	35°
Wavelength - Peak	625nm
Height (Max)	5.30mm
Package / Case	Radial
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are organized by compatibility with the 3HD-F based on the following critical parameters: color (red), lens transparency (diffused), lens size (3mm T-1), mounting type (through-hole radial), and forward voltage tolerance. Parts are grouped into categories based on forward voltage alignment, as this parameter directly impacts circuit design and current-limiting resistor selection.

Group A - Direct Voltage Match (2V forward voltage): Parts with forward voltage between 1.8V and 2.2V are considered direct substitutes with minor circuit adjustments.

Group B - Lower Voltage Alternatives (1.7V forward voltage): Parts operating at 1.7V require reduced current-limiting resistance but maintain mechanical compatibility.

Group C - Higher Voltage Variants (5V and 12V): Parts with significantly higher forward voltages (5V, 12V) require circuit redesign and are suitable only when output stages support these operating conditions.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating, and through-hole radial package configuration equivalent to the 3HD-F.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status	Packaging
3HD-F	Bivar Inc.	2V	20mA	30mcd	35°	625nm	5.30mm	Active	Bulk
151031SS06000	Würth Elektronik	2.2V	20mA	35mcd	60°	650nm	5.55mm	Active	Bulk
4300F1LC	Visual Communications Company - VCC	1.8V	2mA	1.8mcd	50°	635nm	6.35mm	Not For New Designs	Bulk
HLMP-1600	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	6.35mm	Active	Bulk
HLMP-1601	Broadcom Limited	12V	13mA	2.1mcd	60°	635nm	6.35mm	Active	Bulk
HLMP-1700	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active	Bulk
HLMP-1700-B0002	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active	Cut Tape (CT)
HLMP-K101	Broadcom Limited	1.8V	20mA	45mcd	60°	645nm	6.35mm	Active	Bulk
HLMP-K150	Broadcom Limited	1.7V	1mA	2mcd	60°	660nm	6.35mm	Active	Bulk
HLMP-K150-C0002	Broadcom Limited	1.7V	1mA	2mcd	60°	660nm	6.35mm	Active	Cut Tape (CT)
LTL-1CHE	Lite-On Inc.	2V	20mA	12.6mcd	60°	635nm	5.20mm	Active	Bulk

Engineering Selection Recommendations

Primary Direct Substitutes (Active Product Status, 2V Forward Voltage):

151031SS06000 (Würth Elektronik) is the highest-performance direct substitute, offering 35mcd at identical 20mA test current with 2.2V forward voltage within acceptable circuit tolerance. This part is ROHS3 compliant and active in production with 10,009 units available.

LTL-1CHE (Lite-On Inc.) operates at 2V forward voltage with 20mA test current identical to 3HD-F, providing 12.6mcd luminous intensity. This part is ROHS3 compliant and active in production with 16,940 units available, though lower brightness than 3HD-F.

Secondary Substitutes (Active Product Status, Modified Operating Conditions):

HLMP-K101 (Broadcom Limited) provides 45mcd at 1.8V forward voltage and 20mA test current, offering superior brightness with slightly lower forward voltage. This part is active in production with 37,707 units available and is suitable where higher luminous intensity is beneficial.

HLMP-1700 and HLMP-1700-B0002 (Broadcom Limited) operate at 1.7V forward voltage with 2mA test current. These parts have significantly lower current demand and are active in production (530,300 and 21,034 units respectively), suitable for low-power indication circuits.

HLMP-K150 and HLMP-K150-C0002 (Broadcom Limited) operate at 1.7V forward voltage with 1mA test current, optimized for ultra-low-power applications. Both variants are active in production (34,560 and 3,198 units respectively).

Not Recommended for New Designs:

4300F1LC (Visual Communications Company - VCC) is marked "Not For New Designs" and should not be selected for new circuit development despite electrical compatibility at 1.8V forward voltage.

Higher Voltage Variants (Circuit Redesign Required):

HLMP-1600 and HLMP-1601 (Broadcom Limited) operate at 5V and 12V forward voltage respectively and require complete redesign of current-limiting circuits. These parts are active in production but suitable only for applications with compatible supply voltages.

Frequently Asked Questions (FAQ)

Q: Can I directly substitute 151031SS06000 for 3HD-F without circuit changes?

A: 151031SS06000 operates at 2.2V forward voltage compared to 3HD-F at 2V. This 0.2V difference is within typical LED tolerance ranges and requires only minor current-limiting resistor adjustment. The 20mA test current and similar physical dimensions (5.30mm vs 5.55mm height) ensure mechanical compatibility in through-hole applications.

Q: What is the difference between HLMP-K150 (1mA test current) and HLMP-K101 (20mA test current)?

A: HLMP-K150 is optimized for ultra-low-power indication with 1mA test current and 2mcd brightness, while HLMP-K101 operates at 20mA test current (identical to 3HD-F) and delivers 45mcd brightness. Selection depends on circuit power budget and required luminous intensity for your specific application.

Q: Are HLMP-1700-B0002 and HLMP-1700 electrically identical?

A: Yes. Both parts are electrically and physically identical, operating at 1.7V forward voltage with 2mA test current and 2.1mcd brightness. The difference is packaging: HLMP-1700 is supplied in Bulk packaging while HLMP-1700-B0002 is supplied in Cut Tape (CT) packaging. Select based on your assembly and inventory requirements.

Q: Why do some parts have lower brightness (mcd) than 3HD-F?

A: Lower brightness ratings reflect different optical designs optimized for different power levels and viewing angles. HLMP-1700 series parts, for example, achieve lower brightness at lower current consumption (2mA vs 20mA). Select based on your circuit's current budget and required indication brightness.

Q: Can I use HLMP-1600 (5V) as a substitute for 3HD-F (2V)?

A: No. HLMP-1600 requires 5V forward voltage, necessitating complete redesign of the current-limiting circuit. This part is suitable only if your circuit is designed for 5V operation. Use HLMP-1600 only when application requirements explicitly demand 5V LED operation.

Q: Is 3HD-F still in active production?

A: Yes. 3HD-F is marked as "Active" in product status with 1,103 units currently in stock. All recommended direct substitutes (151031SS06000, LTL-1CHE, HLMP-K101) are also active in production with larger available quantities.

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