Is there a pin-compatible replacement for TX4139?

The TX4138 shares the same ESOIC8 package and is likely pin-compatible, but it has a lower maximum input voltage (60V vs 75V). This makes it a downgrade and requires careful circuit validation.

What risks should I check before replacing TX4139?

Key risks include differences in maximum input voltage, output current capability, and switching frequency. Any substitute requires verifying these against your application's needs, as they can affect performance and safety.

TX4139 Alternatives, Datasheet & Cross Reference | Shenzhen Xindingsheng Technology Co., Ltd.

Find alternatives and replacements for the TX4139, a 75V, 2A step-down DC-DC converter in an ESOIC8 package. Review key parameter differences before selection.

AI replacement insight

Electrical riskhigh

Candidates have significantly different voltage ratings or switching frequencies.

Package risklow

The ESOIC8 package is common, but pinout must always be verified.

Firmware risklow

This is an analog component with no firmware.

Sourcing riskmedium

The target manufacturer is less common, suggesting a search for alternatives from major suppliers is prudent.

Can it be replaced directly?

No direct, drop-in replacement for the TX4139 has been found. The closest candidate, TX4138, has a lower input voltage rating.

Best replacement path

Consider the TX4138 as a potential family alternative, but only if the system's maximum input voltage is below 60V. Otherwise, a new part search is required.

Main risk

The primary risk is finding a substitute with a sufficiently high input voltage rating (75V or more) while matching other key parameters.

Recommended alternatives

A potential alternative in the same family with a matching package, but a lower 60V input voltage rating.

View details

Alternative comparison matrix

Feature / factor	TX4139	TX4138	Compatibility / risk
Package	ESOIC8	ESOIC8	ESOIC8 — Package matches.
Pinout	8	8	8 — Pin count matches. Pinout assumed compatible as family part, but requires datasheet verification.
Voltage	4.5V to 75V	4.5V to 60V	4.5V to 60V — Candidate has a lower maximum input voltage.
Current	2A	4A	4A — Candidate offers higher output current capability.
Frequency	200KHz	200KHz	200KHz — Switching frequency matches.

Application & sourcing insights

Questions & answers

The TX4138 is a related part with the same package but a lower 60V input voltage rating. No direct drop-in replacement has been identified; careful review of all electrical parameters is required.