Is there a pin-compatible replacement for LP3321B6F?

While several alternatives exist in the same SOT23-6 package, no drop-in pin-compatible replacement has been verified without a datasheet review. The LP3320B6F is the most likely candidate for pin compatibility, but requires engineering validation.

What risks should I check before replacing LP3321B6F?

When replacing the LP3321B6F, key risks include: 1) Electrical Mismatch: Ensure the candidate's max output voltage (≥37V) and switch current (≥1.5A) match. 2) Functional Differences: Check for features like PWM dimming. 3) External Components: Different feedback voltages will require recalculating external sense resistors.

LP3321B6F Alternatives, Datasheet & Cross Reference | Lowpower Semiconductor Co., Ltd.

LP3321B6F is a 1MHz boost LED driver in a SOT23-6 package, designed for driving series LEDs up to 37V. Finding a replacement requires matching topology, package, output voltage, and switching frequency.

AI replacement insight

Electrical riskmedium

Candidates may have lower voltage ratings or different feedback voltages.

Package risklow

Most candidates are in the same SOT23-6 package, but pinout must be verified.

Can it be replaced directly?

No verified direct drop-in replacement is available. LP3320B6F is a strong candidate for a functional alternative that may be pin-compatible, but requires review.

Best replacement path

Start with LP3320B6F due to its close parametric match, then consider other functional alternates if dimming or other features differ.

Main risk

The primary risk is a mismatch in maximum output voltage or a change in switching frequency, which could damage LEDs or require redesign of the inductor circuit.

Recommended alternatives

A strong functional alternative from the same manufacturer with matching package and key electrical ratings.

View details

Alternative comparison matrix

Feature / factor	LP3321B6F	LP3320B6F	STI9287B	PAM2803AAF095	Compatibility / risk
Package	SOT23-6	SOT23-6	SOT23-6	SOT23-6	SOT23-6 — Matches target package.; STI9287B: Matches target package.; PAM2803AAF095: Matches target package.
Topology	Boost (Step-Up)	Boost	-	-	Boost — Matches target topology.
Voltage	37V	37V	30V	Unknown	37V / 30V / Unknown — Max output voltage matches.; STI9287B: Lower maximum output voltage.; PAM2803AAF095: Maximum output voltage is not specified and must be verified.
Frequency	1 MHz	1.0 MHz	1 MHz	1 MHz	1.0 MHz / 1 MHz — Switching frequency matches.; STI9287B: Switching frequency matches.; PAM2803AAF095: Switching frequency matches.
Dimming	PWM	Not specified	-	-	Not specified — Target specifies PWM dimming; candidate feature must be verified.
Efficiency	94%	-	90%	90%	90% — Lower efficiency.; PAM2803AAF095: Slightly lower efficiency.
Current	1.5A (Switch)	-	-	1A (LED)	1A (LED) — Switch current limit is not specified; may not match target's 1.5A.

Application & sourcing insights

Questions & answers

The LP3320B6F from the same manufacturer is a strong functional alternative, sharing the same package and core electrical specifications. However, users should verify the dimming control feature matches their application requirements.