BD18343FV-ME2 Equivalent & Substitute Parts

Part Overview

The BD18343FV-ME2 is an LED Driver IC manufactured by Rohm Semiconductor, classified as a Power Management (PMIC) device. This single-output DC DC controller features PWM dimming capability and operates across a 4.5V to 19V supply range with a frequency range of 100Hz to 5kHz. The device is packaged in a 16-LSSOP (16-SSOP-B) surface mount configuration and carries automotive-grade qualification (AEC-Q100) with active product status.

Identifying equivalent and substitute parts is necessary when the primary part number becomes unavailable, when supply chain constraints require alternative sourcing, or when design flexibility permits functional equivalents that meet the same electrical and mechanical specifications.

Substiute Parts

BD18343FV-ME2

Rohm SemiconductorIn Stock: 3275BD18343FV-ME2 Datasheet

Current PartRFQ

BD18341FV-ME2

Rohm SemiconductorIn Stock: 1380BD18341FV-ME2 Datasheet

Parametric EquivalentRFQ

BD18342FV-ME2

Rohm SemiconductorIn Stock: 3598BD18342FV-ME2 Datasheet

Parametric EquivalentRFQ

LM3401MM/NOPB

Texas InstrumentsIn Stock: 10377LM3401MM/NOPB Datasheet

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LM3409QMY/NOPB

Texas InstrumentsIn Stock: 17181LM3409QMY/NOPB Datasheet

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LM3421Q1MHX/NOPB

Texas InstrumentsIn Stock: 2111LM3421Q1MHX/NOPB Datasheet

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LT3755EMSE-2#PBF

Analog Devices Inc.In Stock: 4280LT3755EMSE-2#PBF Datasheet

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MIC3203YM

Microchip TechnologyIn Stock: 7806MIC3203YM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BD18343FV-ME2 are classified into two categories based on parametric alignment:

Parametric Equivalents share identical or functionally equivalent electrical and mechanical specifications:

• BD18341FV-ME2 and BD18342FV-ME2 (Rohm Semiconductor) maintain the same supply voltage range (4.5V–19V), frequency range (100Hz–5kHz), PWM dimming capability, package type (16-LSSOP), automotive grade, AEC-Q100 qualification, and operating temperature range (-40°C to 125°C).

Similar Parts provide functional LED driver control with PWM dimming but differ in one or more key parameters:

• LM3401MM/NOPB (Texas Instruments): Smaller package (8-VSSOP), higher maximum supply voltage (35V), higher frequency (1.5MHz), specified output current (1A), but narrower operating temperature specification.
• LM3409QMY/NOPB (Texas Instruments): Larger package (10-HVSSOP), higher supply voltage range (6V–42V), dual dimming modes (Analog and PWM), automotive grade with AEC-Q100, but higher MSL rating (3).
• LM3421Q1MHX/NOPB (Texas Instruments): Larger package (16-HTSSOP), wider supply voltage range (4.5V–75V), multiple topologies (SEPIC, Buck, Boost), higher frequency (2MHz), dual dimming modes, automotive grade with AEC-Q100.
• LT3755EMSE-2#PBF (Analog Devices Inc.): Smaller package (16-MSOP-EP), lower maximum supply voltage (40V), higher frequency range (100kHz–1MHz), multiple topologies (Flyback, SEPIC, Buck, Boost), dual dimming modes, but narrower operating temperature (0°C–125°C).
• MIC3203YM (Microchip Technology): Smaller package (8-SOIC), higher maximum supply voltage (42V), higher frequency (1.5MHz), Step-Down topology only, PWM dimming, automotive-grade compatible operating temperature.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents): BD18341FV-ME2 and BD18342FV-ME2 are the primary substitutes for BD18343FV-ME2. Both maintain identical electrical specifications, package configuration, automotive qualification, and AEC-Q100 compliance. These parts are suitable for direct PCB substitution without design modification.

For Automotive Applications Requiring AEC-Q100: LM3409QMY/NOPB and LM3421Q1MHX/NOPB (Texas Instruments) are qualified alternatives. Both carry automotive grade and AEC-Q100 certification. LM3421Q1MHX/NOPB offers extended supply voltage range (4.5V–75V) and multiple topology support, while LM3409QMY/NOPB provides dual dimming modes (Analog and PWM) within a narrower voltage range (6V–42V).

For Standard-Grade Applications: LM3401MM/NOPB, LT3755EMSE-2#PBF, and MIC3203YM are suitable when automotive qualification is not required. All three maintain RoHS3 compliance and operate within the -40°C to 125°C temperature range. Package size and frequency characteristics differ; selection depends on PCB layout constraints and application frequency requirements.

Compliance Considerations: All listed substitutes maintain ROHS3 compliance and REACH unaffected status. MSL ratings are consistent (Level 1 or Level 3), with no impact on standard handling procedures. ECCN and HTSUS classifications remain unchanged across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can BD18341FV-ME2 or BD18342FV-ME2 be used as direct replacements for BD18343FV-ME2? A: Yes. Both parts share identical supply voltage range (4.5V–19V), frequency range (100Hz–5kHz), PWM dimming capability, 16-LSSOP package, automotive grade, and AEC-Q100 qualification. No design changes are required for direct PCB substitution.

Q: What is the primary difference between the BD18343FV-ME2 and LM3421Q1MHX/NOPB? A: The LM3421Q1MHX/NOPB supports a wider supply voltage range (4.5V–75V) versus 4.5V–19V, operates at higher frequency (2MHz versus 100Hz–5kHz), supports multiple topologies (SEPIC, Buck, Boost versus single topology), and offers dual dimming modes (Analog and PWM versus PWM only). Both maintain automotive grade and AEC-Q100 qualification. Package differs (16-HTSSOP versus 16-LSSOP).

Q: Are LM3401MM/NOPB and MIC3203YM suitable for automotive applications? A: LM3401MM/NOPB and MIC3203YM are standard-grade parts without automotive qualification or AEC-Q100 certification. They are suitable for non-automotive LED driver applications. For automotive requirements, use BD18341FV-ME2, BD18342FV-ME2, LM3409QMY/NOPB, or LM3421Q1MHX/NOPB.

Q: What package considerations apply when selecting a substitute? A: BD18343FV-ME2 uses a 16-LSSOP package. Parametric equivalents (BD18341FV-ME2, BD18342FV-ME2) use the same package. Alternative parts use different packages: LM3401MM/NOPB and MIC3203YM use 8-pin packages (8-VSSOP and 8-SOIC respectively), requiring PCB layout redesign. LM3409QMY/NOPB uses 10-HVSSOP, and LM3421Q1MHX/NOPB uses 16-HTSSOP. LT3755EMSE-2#PBF uses 16-MSOP-EP with exposed pad.

Q: Does operating temperature range affect substitution eligibility? A: BD18343FV-ME2 operates from -40°C to 125°C (TA). All listed substitutes maintain this range or exceed it. LT3755EMSE-2#PBF has a narrower range (0°C to 125°C), which may limit use in applications requiring sub-zero operation.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the primary part.