What risks should I check before replacing TP4059?

Key risks include differences in max charge current, a narrower input voltage range, and potential pinout mismatches. Always verify the pinout and ensure the alternative's parameters meet your application's requirements.

TP4059 Alternatives, Datasheet & Cross Reference | Nanjing Top Power ASIC Co., Ltd.

TP4059 is a popular 600mA linear Li-Ion battery charger in a SOT-23-6 package. Finding a replacement involves matching charge parameters, input voltage range, and pinout.

AI replacement insight

Electrical riskmedium

Candidates have a narrower input voltage range (max 6V vs 9V) which may not be suitable for all designs.

Package riskhigh

While the package is the same (SOT-23-6), pinout compatibility is not guaranteed and must be verified to avoid board rework.

Can it be replaced directly?

Direct replacement for TP4059 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Use a functional alternative like HX4057A or BL8573CB6TR after verifying the narrower input voltage range is acceptable and confirming the pinout matches your board layout.

Main risk

The main risks are a narrower input voltage range and potential pinout differences in alternative parts, which could require board redesign.

Recommended alternatives

Functional alternative with lower charge current and a narrower input voltage range; pinout requires verification.

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Alternative comparison matrix

Feature / factor	TP4059	BL8573CB6TR	HX4057A	Compatibility / risk
Application	Linear Charger	Linear Charger	Linear Charger	Linear Charger — Function matches.; HX4057A: Function matches.
Package	SOT-23-6	SOT-23-6	SOT-23-6	SOT-23-6 — Package matches, pinout requires verification.; HX4057A: Package matches, pinout requires verification.
Current	600mA	500mA/1.5A prog.	500mA	500mA/1.5A prog. — Candidate charge current is programmable and can match or exceed target.; HX4057A: Candidate has lower max charge current.
Voltage	4.2V	4.2V/4.35V sel.	4.2V	4.2V/4.35V sel. — Charge float voltage is selectable and includes target's value.; HX4057A: Charge float voltage matches.

Application & sourcing insights

Questions & answers

Verified drop-in options for TP4059 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.