LT3935RV#PBF Equivalent & Substitute Parts

Part Overview

The LT3935RV#PBF is an LED Driver IC manufactured by Analog Devices Inc., classified as a Power Management PMIC. This device functions as a 1-output DC-DC regulator with step-down (buck) topology, PWM dimming capability, and 4A output current capacity. The part operates across a wide supply voltage range of 3.6V to 36V and is rated for automotive-grade applications with an operating temperature range of -40°C to 150°C (TJ).

The LT3935RV#PBF maintains Active product status with 808 units currently in stock. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative packaging or performance requirements while maintaining functional compatibility within LED driver applications.

Key Parameters

Parameter	LT3935RV#PBF
Manufacturer	Analog Devices Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	3.6V
Voltage - Supply (Max)	36V
Voltage - Output	0V ~ 36V
Current - Output / Channel	4A
Frequency	200kHz ~ 2MHz
Dimming	PWM
Applications	Lighting
Operating Temperature	-40°C ~ 150°C (TJ)
Grade	Automotive
Package / Case	28-TFQFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the LT3935RV#PBF are identified based on functional equivalence within LED driver applications. The primary substitution criteria are:

Critical Parameters for Substitution:

Topology classification (Step-Down Buck, Step-Up Boost, or SEPIC)
Dimming capability (PWM, Analog, or Single-Wire)
Output current capacity
Supply voltage range compatibility
Single output configuration
Surface mount packaging
RoHS3 compliance

The substitute parts listed represent devices that share core LED driver functionality but may differ in specific electrical ratings, package form factors, or dimming methodologies. Substitution suitability depends on the application's specific requirements for output current, supply voltage range, and dimming control method.

Parameter Comparison

Parameter	LT3935RV#PBF	CAV4201TD-GT3	HV9918K7-G	LM3410XSDE/NOPB	MIC2873YCS-TR	MP2410GJ-Z	MP3205DJ-LF-Z	NCV3065MNTXG	PAM2841GR
Manufacturer	Analog Devices Inc.	onsemi	Microchip Technology	Texas Instruments	Microchip Technology	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.	onsemi	Diodes Incorporated
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	SEPIC, Step-Up (Boost)	Step-Up (Boost)	Step-Down (Buck)	Step-Up (Boost)	Step-Down (Buck), Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	3.6V	6.5V	4.5V	2.7V	2.7V	4.2V	2.5V	3V	2.7V
Voltage - Supply (Max)	36V	36V	40V	5.5V	5.5V	24V	6V	40V	5.5V
Current - Output / Channel	4A	350mA	30mA	2.8A (Switch)	1.2A (Flash)	2A	350mA (Switch)	1.5A (Switch)	1.5A (Switch)
Frequency	200kHz ~ 2MHz	50kHz ~ 1MHz	2MHz	1.6MHz	2MHz	1MHz	1.3MHz	150kHz	1MHz
Dimming	PWM	Analog	Analog, PWM	PWM	Single-Wire	Analog	Analog, PWM	Analog, PWM	Analog, PWM
Applications	Lighting	Lighting	Lighting, Signage	Backlight	Camera Flash	Backlight	Backlight	Lighting	-
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Grade	Automotive	-	-	-	-	-	-	-	-
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	28-TFQFN Exposed Pad	SOT-23-5 Thin, TSOT-23-5	8-WDFN Exposed Pad	6-WDFN Exposed Pad	9-UFBGA, WLCSP	SOT-23-6 Thin, TSOT-23-6	SOT-23-5 Thin, TSOT-23-5	8-VDFN Exposed Pad	8-WFDFN Exposed Pad
Product Status	Active	Last Time Buy	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Active Product Status Substitutes:

The following substitute parts maintain Active product status and are recommended for new designs and ongoing production:

HV9918K7-G (Microchip Technology): Active status with 14,257 units in stock. Supports PWM and Analog dimming with extended supply voltage range (4.5V to 40V). Suitable for lighting and signage applications.
LM3410XSDE/NOPB (Texas Instruments): Active status with 1,372 units in stock. SEPIC/Boost topology with PWM dimming. Applicable for backlight applications with lower supply voltage requirements (2.7V to 5.5V).
MP2410GJ-Z (Monolithic Power Systems Inc.): Active status with 27,500 units in stock. Step-down buck topology with analog dimming. Highest inventory availability among substitutes.
MP3205DJ-LF-Z (Monolithic Power Systems Inc.): Active status with 33,004 units in stock. Boost topology with dual dimming capability (Analog and PWM). Highest inventory level among all listed substitutes.
NCV3065MNTXG (onsemi): Active status with 21,200 units in stock. Dual topology (Buck and Boost) with analog and PWM dimming. Supports wide supply voltage range (3V to 40V) compatible with LT3935RV#PBF.
PAM2841GR (Diodes Incorporated): Active status with 3,250 units in stock. Boost topology with dual dimming capability. Supports 40V output voltage.

Last Time Buy Status:

CAV4201TD-GT3 (onsemi): Last Time Buy status with 3,818 units in stock. Not recommended for new designs. Step-down buck topology with analog dimming only.

Compliance and Certifications:

All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the LT3935RV#PBF. Moisture sensitivity levels vary; parts with MSL 1 (Unlimited) offer superior handling flexibility compared to MSL 3 (168 Hours) classification.

Automotive Grade Consideration:

The LT3935RV#PBF carries automotive-grade classification. No substitute parts in the provided list carry automotive-grade designation. Applications requiring automotive qualification should maintain the LT3935RV#PBF as the primary component.

Frequently Asked Questions (FAQ)

Q: Can CAV4201TD-GT3 directly replace LT3935RV#PBF?

A: CAV4201TD-GT3 shares step-down buck topology and single-output configuration. However, it operates at lower maximum supply voltage (36V vs. 36V match) and significantly reduced output current (350mA vs. 4A). Additionally, CAV4201TD-GT3 carries Last Time Buy status, making it unsuitable for new designs. Substitution is not recommended.

Q: Which substitute part best matches the 4A output current of LT3935RV#PBF?

A: LM3410XSDE/NOPB provides the closest output current match at 2.8A (Switch). However, it operates on SEPIC/Boost topology with a restricted supply voltage range (2.7V to 5.5V), limiting its applicability to the LT3935RV#PBF's 3.6V to 36V range. No substitute part achieves the full 4A output current specification.

Q: What is the significance of topology differences between the main part and substitutes?

A: The LT3935RV#PBF uses step-down (buck) topology, which steps down higher input voltages to lower output voltages. Substitute parts using step-up (boost) or SEPIC topologies perform different voltage conversion functions. Topology selection depends on the application's input and output voltage requirements. Buck topology substitutes (CAV4201TD-GT3, MP2410GJ-Z, NCV3065MNTXG) are more directly comparable to LT3935RV#PBF.

Q: How do dimming methods affect substitution compatibility?

A: The LT3935RV#PBF uses PWM dimming exclusively. Substitute parts offering PWM capability include HV9918K7-G, LM3410XSDE/NOPB, MP3205DJ-LF-Z, NCV3065MNTXG, and PAM2841GR. Parts with analog-only dimming (CAV4201TD-GT3, MP2410GJ-Z) require different control circuitry. Application firmware and control logic must align with the selected dimming method.

Q: What packaging considerations apply to substitution?

A: The LT3935RV#PBF uses 28-TFQFN (4x5) packaging. Substitute parts employ smaller packages: TSOT-23-5 (CAV4201TD-GT3, MP3205DJ-LF-Z), 8-DFN variants (HV9918K7-G, NCV3065MNTXG, PAM2841GR), 6-WSON (LM3410XSDE/NOPB), TSOT-23-6 (MP2410GJ-Z), and 9-WLCSP (MIC2873YCS-TR). Smaller packages may require PCB layout redesign and different thermal management approaches.

Q: Are all substitute parts suitable for automotive applications?

A: The LT3935RV#PBF carries automotive-grade classification. None of the listed substitute parts carry automotive-grade designation. Applications requiring automotive qualification must use the LT3935RV#PBF or identify automotive-qualified alternatives outside this list.

Q: What is the impact of operating temperature range differences?

A: The LT3935RV#PBF operates to 150°C (TJ), the highest among all listed parts. Most substitutes operate to 125°C (TJ/TA), and some to 85°C (TA). Applications requiring operation above 125°C must retain the LT3935RV#PBF. Lower temperature-rated parts are suitable for applications within their specified ranges.

Q: How does supply voltage range affect substitution decisions?

A: The LT3935RV#PBF accepts 3.6V to 36V input. Substitutes vary significantly: CAV4201TD-GT3 requires minimum 6.5V, while LM3410XSDE/NOPB and MP3205DJ-LF-Z operate only to 5.5V maximum. NCV3065MNTXG and HV9918K7-G support the full 36V to 40V range. Supply voltage compatibility is critical for direct substitution.

Q: What inventory considerations should guide substitution selection?

A: MP3205DJ-LF-Z offers the highest inventory (33,004 units), followed by MP2410GJ-Z (27,500 units) and NCV3065MNTXG (21,200 units). HV9918K7-G provides 14,257 units. Lower inventory parts (LM3410XSDE/NOPB with 1,372 units) may present supply chain risk for high-volume applications.

Q: Can MIC2873YCS-TR substitute for LT3935RV#PBF in lighting applications?

A: MIC2873YCS-TR is designed for camera flash applications with single-wire dimming and 1.2A flash current. It uses step-up (boost) topology and operates only to 85°C. It is not suitable for general lighting applications requiring the LT3935RV#PBF's buck topology and higher current capacity.

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