LP3950SL/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP3950SL/NOPB is a Texas Instruments LED Driver IC designed for 6-output DC-DC boost regulation with PWM dimming capability. This Surface Mount device operates at 2MHz frequency with 50mA per-channel output current, supporting applications in backlight and camera flash systems. The part is currently Active in product status with 1800 units in stock. Substitute parts are identified for applications requiring alternative supply voltage ranges, higher output current capacity, or different package configurations while maintaining core LED driver functionality.

Substiute Parts

LP3950SL/NOPB

Texas InstrumentsIn Stock: 1868LP3950SL/NOPB Datasheet

Current PartRFQ

ALED7707TR

STMicroelectronicsIn Stock: 33404ALED7707TR Datasheet

MFR RecommendedRFQ

ISL97636AIRZ-TK

Renesas Electronics CorporationIn Stock: 5193ISL97636AIRZ-TK Datasheet

MFR RecommendedRFQ

LT3598EUF#TRPBF

Analog Devices Inc.In Stock: 1410LT3598EUF#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3950SL/NOPB are qualified based on the following core parameters that determine functional compatibility:

• Topology: Step-Up (Boost) DC-DC regulation with internal switching capability
• Number of Outputs: 6 independent LED driver outputs
• Dimming Control: PWM dimming capability
• Surface Mount Packaging: All substitutes use Surface Mount technology
• RoHS3 Compliance: All parts maintain environmental compliance standards
• Operating Temperature Range: Minimum -40°C lower bound required
• Internal Switch(s): Integrated switching element present

The three identified substitutes (ALED7707TR, ISL97636AIRZ-TK, LT3598EUF#TRPBF) meet these core functional criteria while offering variations in supply voltage range, output current capacity, frequency operation, and package form factor. Selection depends on specific application requirements for input voltage compatibility and output current demands.

Parameter Comparison

Engineering Selection Recommendations

ALED7707TR (STMicroelectronics): This part is recommended for applications requiring higher output current capacity (85mA per channel vs. 50mA) and extended supply voltage range (4.5V to 36V). The part maintains Active product status with high inventory availability (33300 units). Automotive qualification (AEC-Q100) provides additional reliability assurance. Package change from 32-TLGA to 24-QFN requires PCB layout modification. Operating temperature maximum of 150°C (TJ) exceeds the original specification.

ISL97636AIRZ-TK (Renesas Electronics): This part carries Obsolete product status, limiting long-term supply reliability. While it maintains the 6-output configuration and PWM dimming, the lower output current (35mA per channel) and narrower supply voltage range (6V to 24V) restrict application flexibility. This substitute should be considered only for legacy design maintenance where supply continuity is not critical.

LT3598EUF#TRPBF (Analog Devices): This part is recommended for applications requiring the widest supply voltage range (3V to 30V) and dual dimming capability (Analog and PWM). Active product status with MSL Level 1 (Unlimited moisture sensitivity) provides superior handling flexibility. The higher maximum operating temperature (125°C TJ) and extended frequency range (200kHz to 2.5MHz) support diverse application requirements. Output current per channel (30mA) is lower than the original specification.

Frequently Asked Questions (FAQ)

Q: Can ALED7707TR directly replace LP3950SL/NOPB without circuit modification?

A: No. While both are 6-output boost LED drivers with PWM dimming, the ALED7707TR operates with a different supply voltage range (4.5V–36V vs. 2.7V–2.9V) and uses a 24-QFN package instead of 32-TLGA. Circuit redesign is required to accommodate the new input voltage specifications and PCB footprint.

Q: Why is ISL97636AIRZ-TK listed as Obsolete?

A: ISL97636AIRZ-TK carries Obsolete product status from Renesas Electronics. While functional equivalence exists, this status indicates the manufacturer is discontinuing production. New designs should avoid this part; existing designs should plan migration to an Active alternative.

Q: What is the key difference between LT3598EUF#TRPBF and the original LP3950SL/NOPB?

A: The LT3598EUF#TRPBF offers dual dimming modes (Analog and PWM) versus PWM-only on the LP3950SL/NOPB. It also supports a wider supply voltage range (3V–30V) and has superior moisture sensitivity rating (MSL Level 1 vs. Level 3). Output current per channel is lower (30mA vs. 50mA).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (ALED7707TR, ISL97636AIRZ-TK, LT3598EUF#TRPBF) maintain ROHS3 compliance, matching the environmental standards of the original LP3950SL/NOPB.

Q: Which substitute has the highest current capacity per output channel?

A: ALED7707TR provides the highest output current per channel at 85mA, compared to 50mA for the original LP3950SL/NOPB, 35mA for ISL97636AIRZ-TK, and 30mA for LT3598EUF#TRPBF.

Q: Do package differences affect thermal performance?

A: Yes. The original 32-TLGA (5.5x4.5) package differs from the 24-QFN packages used by all substitutes. Thermal performance depends on PCB layout, copper area allocation, and via placement. Thermal modeling is required during design transition.

Q: What is MSL Level 1 versus Level 3?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be stored in standard conditions before moisture absorption requires baking. Level 1 (Unlimited) allows indefinite storage without baking. Level 3 (168 Hours) requires baking if storage exceeds 168 hours. LT3598EUF#TRPBF offers superior handling flexibility with Level 1 rating.