LDD-300L Equivalent & Substitute Parts Reference

Part Overview

The LDD-300L is a 300mA constant current LED driver manufactured by MEAN WELL USA Inc., utilizing buck topology for single-output applications. This device operates across an input voltage range of 9V to 36V and delivers regulated output voltage from 2V to 32V at 300mA maximum current. The LDD-300L features PWM dimming capability, remote on/off control, over-temperature protection (OTP), and short-circuit protection (SCP).

The LDD-300L carries a "Not For New Designs" product status, indicating that MEAN WELL has discontinued active development for this model line. This status necessitates identification of equivalent substitute components for ongoing production requirements, maintenance applications, and design updates. Substitute parts must maintain functional compatibility while meeting current compliance and availability standards.

Substiute Parts

LDD-300L

MEAN WELL USA Inc.In Stock: 1877LDD-300L Datasheet

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NLDD-350H

MEAN WELL USA Inc.In Stock: 1501NLDD-350H Datasheet

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RCD-24-0.30

Recom PowerIn Stock: 50185RCD-24-0.30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LDD-300L are identified based on strict alignment with the following critical parameters:

Primary Substitution Criteria:

• Constant current topology with buck converter architecture
• Single output configuration
• Output current capability of 300mA or greater
• Output voltage range encompassing or exceeding 2V to 32V
• Input voltage compatibility within or overlapping the 9V to 36V range
• PWM dimming capability
• Remote on/off control functionality
• Short-circuit protection (SCP)
• Through-hole mounting configuration
• ROHS3 compliance and CE certification

Identified Substitute Parts:

1. NLDD-350H (MEAN WELL USA Inc.) – Active product status with enhanced specifications including 350mA output current, extended input voltage range (10V to 59V), and expanded output voltage range (6V to 52V). Larger 24-DIP package footprint.

2. RCD-24-0.30 (Recom Power) – Active product status with matched 300mA output current, compatible input voltage range (4.5V to 36V), and extended output voltage range (2V to 35V). Maintains 6-DIP package form factor. Supports both analog and PWM dimming.

Parameter Comparison

Engineering Selection Recommendations

For Direct Form-Factor Replacement (PCB Layout Compatibility):

The RCD-24-0.30 from Recom Power is the preferred substitute when PCB layout constraints require maintaining the original 6-DIP package footprint. This part delivers identical 300mA output current, maintains the same operating temperature range (-40°C to 85°C), and provides equivalent efficiency (96%). The RCD-24-0.30 extends output voltage capability to 35V and reduces minimum input voltage to 4.5V, offering enhanced flexibility. Active product status ensures long-term availability and supply chain stability. Compliance certifications include cULus approval, meeting North American and international safety standards.

For Enhanced Performance and Extended Operating Range:

The NLDD-350H from MEAN WELL USA Inc. provides increased output current capacity (350mA) and extended input voltage range (10V to 59V), accommodating higher-power LED applications and broader input supply scenarios. This part maintains manufacturer continuity within the MEAN WELL product ecosystem. Active product status guarantees ongoing support. However, the 24-DIP package footprint requires PCB redesign and occupies significantly larger board space (32.1mm x 20.5mm versus 22.6mm x 9.9mm). Operating temperature maximum is reduced to 50°C, which may limit applications in high-ambient-temperature environments. Dual certification (CE and EAC) extends regulatory coverage to Eurasian markets.

Compliance and Certification Considerations:

All three parts maintain ROHS3 compliance and REACH unaffected status. The LDD-300L and RCD-24-0.30 both support the full -40°C to 85°C operating range, critical for industrial and automotive applications. The NLDD-350H's reduced upper temperature limit (50°C) restricts deployment in high-temperature environments. Regulatory approval varies: LDD-300L carries CE certification; NLDD-350H adds EAC certification; RCD-24-0.30 holds cULus certification, providing broader North American acceptance.

Frequently Asked Questions (FAQ)

Q: Can the NLDD-350H directly replace the LDD-300L on existing PCBs?

A: No. The NLDD-350H uses a 24-DIP package with 9 leads, while the LDD-300L employs a 6-DIP package with 5 leads. Direct PCB substitution is not possible without circuit board redesign and layout modification. The RCD-24-0.30 maintains the 6-DIP package form factor and enables direct replacement.

Q: What is the minimum input voltage requirement for each part?

A: LDD-300L requires minimum 9V input. NLDD-350H requires minimum 10V input. RCD-24-0.30 operates at minimum 4.5V input, providing the lowest threshold and greatest flexibility for low-voltage supply applications.

Q: Are all substitute parts suitable for high-temperature applications?

A: The LDD-300L and RCD-24-0.30 both support -40°C to 85°C operating range, suitable for high-temperature environments. The NLDD-350H is limited to -40°C to 50°C maximum, restricting use in applications exceeding 50°C ambient temperature.

Q: Which substitute part offers the highest output current capacity?

A: The NLDD-350H delivers 350mA maximum output current, compared to 300mA for both the LDD-300L and RCD-24-0.30. This 50mA additional capacity accommodates higher-power LED strings or multiple parallel LED chains.

Q: Do all parts support PWM dimming?

A: Yes. All three parts support PWM dimming. The RCD-24-0.30 additionally supports analog dimming, providing dual dimming methodology flexibility.

Q: What are the key differences in output voltage range?

A: LDD-300L provides 2V to 32V output range. RCD-24-0.30 extends to 2V to 35V. NLDD-350H offers the widest range at 6V to 52V, accommodating higher-voltage LED string configurations but with 6V minimum output floor.

Q: Which part has the longest supply chain availability?

A: RCD-24-0.30 shows highest inventory (50,100 pieces) and active product status with Recom Power. NLDD-350H maintains active status with MEAN WELL (1,459 pieces in stock). LDD-300L is discontinued (1,801 pieces remaining inventory only).

Q: Are all parts ROHS3 compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations.

Q: What certifications does each part carry?

A: LDD-300L carries CE certification. NLDD-350H holds CE and EAC certifications. RCD-24-0.30 carries cULus certification, providing North American and international safety approval.