BD9428 LED Driver IC - Equivalent & Substitute Parts

Part Overview

The BD9428 is a 4-output LED driver IC with integrated DC-DC step-up (boost) regulator topology, designed for backlight applications. This through-hole 16-DIP component operates from 9V to 35V input with 250mA per-channel output capability and PWM dimming control at 150kHz switching frequency. The BD9428 is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Active alternatives with matching or enhanced electrical characteristics are available from multiple manufacturers.

Substiute Parts

BD9428

Rohm SemiconductorIn Stock: 16278BD9428 Datasheet

Current PartRFQ

BD9428EFV-E2

Rohm SemiconductorIn Stock: 967BD9428EFV-E2 Datasheet

SimilarRFQ

ADD5207ACPZ-RL

Analog Devices Inc.In Stock: 28091ADD5207ACPZ-RL Datasheet

SimilarRFQ

LP8553TLE/NOPB

Texas InstrumentsIn Stock: 1161LP8553TLE/NOPB Datasheet

SimilarRFQ

LT3599IFE#PBF

Analog Devices Inc.In Stock: 27339LT3599IFE#PBF Datasheet

SimilarRFQ

LT3599IUH#TRPBF

Analog Devices Inc.In Stock: 2405LT3599IUH#TRPBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BD9428 is determined by the following critical parameters:

Primary Matching Criteria:

• Topology: Step-Up (Boost) DC-DC regulator
• Number of Outputs: 4 channels
• Dimming Control: PWM capability
• Application: Backlight LED driver

Electrical Compatibility Range:

• Input voltage range must encompass or overlap with 9V-35V
• Output current per channel must meet or exceed 250mA requirement
• Switching frequency and output voltage specifications must support backlight application requirements

Mechanical Compatibility:

• Package type determines board-level integration feasibility
• Through-hole packages (16-DIP) are direct mechanical replacements
• Surface-mount alternatives require PCB redesign but offer electrical equivalence

Substitute parts are grouped into two categories: direct package replacements (through-hole 16-DIP) and functional equivalents with alternative packaging (surface-mount options).

Parameter Comparison

Engineering Selection Recommendations

BD9428EFV-E2 (Rohm Semiconductor)

This is the direct active equivalent to the obsolete BD9428. It maintains identical electrical specifications (9V-35V input, 250mA per channel, 150kHz operation, PWM dimming) and mechanical compatibility (16-DIP through-hole package). The part is currently in active production status with 888 units in stock. MSL rating increases from 1 to 3 (168 hours), requiring standard moisture control during storage and assembly. This is the primary recommendation for direct replacement in existing designs without PCB modification.

LP8553TLE/NOPB (Texas Instruments)

This surface-mount alternative provides enhanced output current capability (450mA per channel versus 250mA) and wider input voltage range (2.7V-22V). The 25-DSBGA package requires PCB redesign but offers superior current handling for demanding backlight applications. Product status is active with 1125 units available. MSL rating of 1 (unlimited) provides superior moisture tolerance. Suitable for new designs prioritizing higher current delivery.

LT3599IFE#PBF and LT3599IUH#TRPBF (Analog Devices Inc.)

Both LT3599 variants offer dual dimming capability (analog and PWM), extended temperature range (-40°C to 125°C junction temperature), and wide input voltage support (2.7V-30V). Output current per channel is 120mA, which is below the BD9428 specification but sufficient for lower-power backlight applications. The 28-TSSOP-EP and 32-QFN packages require PCB redesign. Both variants are in active production with strong inventory availability. MSL rating of 1 (unlimited) ensures reliable handling. Suitable for applications requiring extended temperature operation and dual dimming control.

ADD5207ACPZ-RL (Analog Devices Inc.)

This part operates within a narrower input voltage range (6V-21V) and provides only 25mA per channel output current, making it unsuitable as a direct substitute for the 250mA BD9428 specification. It is listed for reference only and is not recommended for BD9428 replacement applications.

Frequently Asked Questions (FAQ)

Q: Can BD9428EFV-E2 be used as a direct replacement for BD9428 without PCB modification?

A: Yes. BD9428EFV-E2 is pin-compatible and maintains identical electrical specifications. Both use 16-DIP through-hole packaging. No PCB redesign is required. The increased MSL rating (3 versus 1) requires standard moisture control during storage and assembly but does not affect electrical performance.

Q: What is the key difference between through-hole (BD9428EFV-E2) and surface-mount alternatives (LP8553TLE/NOPB, LT3599 variants)?

A: Through-hole packages mount vertically through PCB holes and are suitable for existing through-hole designs. Surface-mount packages require PCB redesign with appropriate landing patterns and reflow soldering. Surface-mount alternatives often provide enhanced electrical performance (higher current, wider voltage range) but demand PCB layout changes.

Q: Why does ADD5207ACPZ-RL appear in the substitute list if it is not recommended?

A: ADD5207ACPZ-RL is listed because it shares the same topology (step-up boost), output count (4 channels), and dimming method (PWM). However, its 25mA per-channel output current falls significantly below the 250mA BD9428 specification, making it unsuitable for equivalent replacement. It is included for completeness in the electrical family but should not be selected for BD9428 substitution.

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

A: LP8553TLE/NOPB provides 450mA per channel, the highest among all listed substitutes. This exceeds the BD9428 specification of 250mA and is suitable for applications requiring higher LED current delivery. Surface-mount packaging requires PCB redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (BD9428EFV-E2, ADD5207ACPZ-RL, LP8553TLE/NOPB, LT3599IFE#PBF, LT3599IUH#TRPBF) are ROHS3 compliant, matching the compliance status of the original BD9428.

Q: What does MSL rating mean, and why does it vary among substitutes?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to ambient conditions before assembly. MSL 1 (unlimited) allows indefinite storage without moisture control. MSL 3 (168 hours) requires components to be used within 168 hours of package opening or stored in dry conditions. BD9428EFV-E2 and ADD5207ACPZ-RL have MSL 3 ratings, requiring standard moisture management. LP8553TLE/NOPB and LT3599 variants have MSL 1 ratings, offering superior handling flexibility.

Q: Can LT3599 variants replace BD9428 in high-temperature applications?

A: LT3599IFE#PBF and LT3599IUH#TRPBF support extended junction temperature range (-40°C to 125°C) compared to BD9428 (-40°C to 85°C ambient). However, their 120mA per-channel output current is below the 250mA BD9428 specification. They are suitable only for lower-power backlight applications requiring extended temperature operation. Surface-mount packaging requires PCB redesign.

Q: What is the primary advantage of LP8553TLE/NOPB over BD9428EFV-E2?

A: LP8553TLE/NOPB provides 450mA per-channel output current (versus 250mA) and supports lower input voltage (2.7V minimum versus 9V). These enhancements enable higher LED current delivery and operation from lower supply voltages. The trade-off is surface-mount packaging, which requires PCB redesign. Both parts are in active production.