ProjectsPricingInsights

Best Alternatives to TIP122

Package: TO-220-3onsemiTransistors - Bipolar (BJT) - SingleSeries: -Package: BulkCurrent - Collector (Ic) (Max): 5 AVoltage - Collector Emitter Breakdown (Max): 100 VCurrent - Collector Cutoff (Max): 500µA

TIP122 is an obsolete 100 V, 5 A NPN Darlington in TO-220. Several candidates exist, but none has verified pinout in the supplied data.

AI replacement insight

Electrical riskmedium

Most candidates are 100 V; check stress margin and SOA.

Package riskmedium

TO-220 is claimed, but pinout is missing.

Firmware risklow

Discrete BJT has no firmware interface.

Sourcing riskmedium

Target is obsolete; external parts need ingestion.

Can it be replaced directly?

No verified pin-compatible replacement is proven by the supplied fields.

Best replacement path

Start with onsemi TIP122G, then verify package, pinout, and full ratings.

Main risk

Pinout and thermal/SOA details are not verified for the external candidates.

Recommended alternatives

1
TIP122 package
TIP122

onsemi

Needs validationmedium risk

ST TIP122 may be a cross-vendor alternative after catalog dedupe and pinout review.

View details

Alternative comparison matrix

Feature / factorTIP122TIP122Alt 2Alt 3Compatibility / risk
ApplicationNPN Darlingtonsame MPN familysame MPN family — ST cross-vendor
PackageTO-220TO-220 webTO-220 web — PDF pending
Pinout3-pinnot checkednot checked — needs datasheet
Voltage100 Vcatalog conflictcatalog conflict — dedupe first
LifecycleObsoleteST Active claimST Active claim — web evidence

Application & sourcing insights

Questions & answers

TIP122G is the strongest external candidate, but it still needs package, pinout, and rating verification.