LM3590MF/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3590MF/NOPB is a linear LED driver IC manufactured by Texas Instruments, designed for single-output LED applications with PWM dimming capability. This device operates within a 6V to 12.6V supply range and delivers 20mA output current, making it suitable for backlight applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility while offering improved availability and extended product lifecycle support.

Key Parameters

Parameter	LM3590MF/NOPB
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	Linear
Number of Outputs	1
Voltage - Supply (Min)	6V
Voltage - Supply (Max)	12.6V
Current - Output / Channel	20mA
Dimming	PWM
Internal Switch(s)	Yes
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753 (SOT-23-5)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM3590MF/NOPB are selected based on the following critical parameters that determine functional compatibility:

Primary Selection Criteria:

Single output configuration (Number of Outputs = 1)
Linear topology with internal switching capability
PWM dimming support
Supply voltage range compatibility (minimum 6V, maximum ≤12.6V or higher)
Output current capability ≥20mA
Surface mount technology
ROHS3 compliance
Active product status for long-term availability

Secondary Considerations:

Operating temperature range (-40°C minimum, 85°C or higher maximum)
Package form factor (SOT-23 variants preferred for pin compatibility, though alternative packages acceptable for new designs)
Moisture sensitivity level

Substitute parts are grouped into two categories: direct pin-compatible replacements in similar packages, and functional equivalents with enhanced specifications that operate within the original supply voltage envelope.

Parameter Comparison

Part Number	Manufacturer	Product Status	Type	Outputs	Supply Min (V)	Supply Max (V)	Output Current (mA)	Dimming	Internal Switch	Temp Range (°C)	Package	RoHS
LM3590MF/NOPB	Texas Instruments	Obsolete	Linear	1	6	12.6	20	PWM	Yes	-40 ~ 85	SOT-23-5	ROHS3
AL5809-20QP1-7	Diodes Incorporated	Active	Linear	1	2.5	60	20	—	Yes	-40 ~ 85	PowerDI™ 123	ROHS3
AL5809-25S1-7	Diodes Incorporated	Active	Linear	1	2.5	60	25	—	Yes	-40 ~ 125	SOD-123	ROHS3
AL5809-30S1-7	Diodes Incorporated	Active	Linear	1	2.5	60	30	—	Yes	-40 ~ 125	SOD-123	ROHS3
AL5809-60P1-7	Diodes Incorporated	Active	Linear	1	2.5	60	60	—	Yes	-40 ~ 125	PowerDI™ 123	ROHS3
AL5809-100QP1-7	Diodes Incorporated	Active	Linear	1	2.5	60	100	—	Yes	-40 ~ 125	PowerDI™ 123	ROHS3
AL5801W6-7	Diodes Incorporated	Active	Linear	1	4.6	20	350	PWM	Yes	-40 ~ 125	SOT-23-6	ROHS3
AL5811FF-7	Diodes Incorporated	Active	Linear	1	4.6	60	75	PWM	Yes	-40 ~ 125	6-UDFN	ROHS3
A6260KLJTR-T	Allegro MicroSystems	Active	Linear	1	6	40	350	PWM	Yes	-40 ~ 125	8-SOIC-EP	ROHS3
BCR405UW6Q-7	Diodes Incorporated	Active	Linear	1	1.4	40	50	PWM	No	-55 ~ 150	SOT-23-6	ROHS3
BCR402WH6327XTSA1	Infineon Technologies	Active	Linear	1	1.2	18	60	—	Yes	—	SOT-343	ROHS3

Engineering Selection Recommendations

Recommended Primary Substitute: AL5809-20QP1-7

The AL5809-20QP1-7 from Diodes Incorporated provides the closest functional match to the LM3590MF/NOPB. This part maintains identical 20mA output current and -40°C to 85°C operating temperature range. The supply voltage range (2.5V to 60V) encompasses the original 6V to 12.6V specification. Active product status ensures long-term availability and manufacturing support. ROHS3 compliance and AEC-Q100 automotive qualification provide reliability assurance. The PowerDI™ 123 package offers a compact surface-mount solution, though pinout verification is required for direct board-level substitution.

Alternative Substitutes by Application Requirement:

For applications requiring PWM dimming with enhanced current capability, the AL5811FF-7 (75mA, PWM dimming) or A6260KLJTR-T (350mA, PWM dimming) provide functional upgrades. Both maintain active status and ROHS3 compliance. The A6260KLJTR-T includes AEC-Q100 automotive qualification and operates within the original 6V minimum supply voltage.

For cost-optimized designs where 20mA output current is marginal, the AL5809-25S1-7 or AL5809-30S1-7 provide minimal current increases (25mA and 30mA respectively) with extended temperature range (-40°C to 125°C) and active product status.

The BCR405UW6Q-7 offers PWM dimming with 50mA output current and extended temperature range (-55°C to 150°C), suitable for harsh environment applications. AEC-Q101 automotive qualification is provided.

All recommended substitutes maintain single-output linear topology with internal switching capability and ROHS3 compliance, ensuring regulatory and functional compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can AL5809-20QP1-7 be used as a direct pin-for-pin replacement for LM3590MF/NOPB?

A: The AL5809-20QP1-7 matches the functional specification (20mA output, linear topology, PWM-capable, -40°C to 85°C range) but uses PowerDI™ 123 packaging versus the original SOT-23-5. Pinout compatibility must be verified against application schematics. The part is functionally equivalent but requires board layout evaluation.

Q: Why do some substitute parts list no dimming specification?

A: Dimming capability is specified only when explicitly documented in the manufacturer datasheet. Parts without dimming notation may support PWM dimming through external circuit design. Consult detailed datasheets for dimming implementation methods.

Q: Is the AL5809 series suitable for backlight applications like the original LM3590MF/NOPB?

A: The AL5809 series supports linear LED driver topology with internal switching and operates within the required voltage range. Application suitability depends on specific backlight current and voltage requirements. The 20mA variant (AL5809-20QP1-7) directly matches the original output current specification.

Q: What is the significance of AEC-Q100 and AEC-Q101 qualifications?

A: AEC-Q100 and AEC-Q101 are automotive-grade reliability qualifications. Parts bearing these certifications meet stringent automotive industry standards for temperature cycling, moisture resistance, and long-term reliability. These qualifications are optional for non-automotive applications but indicate enhanced quality assurance.

Q: Can I use a higher current-rated part like AL5809-60P1-7 (60mA) as a substitute?

A: Yes. Higher current-rated parts operate safely at lower currents. The AL5809-60P1-7 maintains linear topology, internal switching, and voltage range compatibility. Design verification is required to ensure the higher current capability does not introduce thermal or circuit stability issues in the specific application.

Q: What is the difference between SOT-23-5 and PowerDI™ 123 packages?

A: SOT-23-5 is a 5-pin small-outline package; PowerDI™ 123 is a 3-pin power package with enhanced thermal dissipation. Both are surface-mount technologies. Package selection depends on board space constraints and thermal requirements. Direct substitution requires PCB layout modification.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, ensuring compatibility with environmental and regulatory requirements equivalent to the original LM3590MF/NOPB.

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