Request Quote
(Ships tomorrow)
STL73 Equivalent & Substitute Parts
Part Overview
The STL73 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 400 V collector-emitter breakdown voltage and 1.5 A maximum collector current. The device is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 1.1 W. The STL73 is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 400 | V |
| Current - Collector (Ic) (Max) | 1.5 | A |
| Power - Max | 1.1 | W |
| Mounting Type | Through Hole | — |
| Package / Case | TO-92-3 | — |
| Operating Temperature (TJ) | 150 | °C |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the STL73 is determined by strict equivalence across the following electrical and mechanical parameters:
Critical Matching Parameters:
- Transistor Type: NPN configuration
- Voltage - Collector Emitter Breakdown (Max): 400 V minimum
- Current - Collector (Ic) (Max): 1.5 A minimum
- Package / Case: TO-92-3 through-hole form factor
- Mounting Type: Through Hole
- Operating Temperature: 150°C (TJ) minimum
Compliance Parameters:
- RoHS3 Compliance required
- REACH Unaffected status
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
The PHD13003C,412 manufactured by WeEn Semiconductors satisfies all critical matching parameters. Both devices share identical voltage and current ratings, identical package configuration, and equivalent thermal operating range. Both devices maintain ROHS3 compliance and identical MSL classification, ensuring direct substitution capability in existing circuit designs.
Parameter Comparison
| Parameter | STL73 (STMicroelectronics) | PHD13003C,412 (WeEn Semiconductors) | Unit |
|---|---|---|---|
| Transistor Type | NPN | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 400 | 400 | V |
| Current - Collector (Ic) (Max) | 1.5 | 1.5 | A |
| Power - Max | 1.1 | 2.1 | W |
| Operating Temperature (TJ) | 150 | 150 | °C |
| Mounting Type | Through Hole | Through Hole | — |
| Package / Case | TO-92-3 | TO-92-3 | — |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | — |
| Product Status | Obsolete | Active | — |
Engineering Selection Recommendations
The PHD13003C,412 is a direct electrical and mechanical substitute for the STL73. Both devices are rated for identical maximum collector-emitter breakdown voltage (400 V) and maximum collector current (1.5 A), with identical TO-92-3 through-hole packaging. The PHD13003C,412 maintains active product status with current manufacturing availability, whereas the STL73 is classified as obsolete.
Both parts maintain ROHS3 compliance and identical moisture sensitivity classification (MSL 1), ensuring compatibility with modern manufacturing and environmental standards. The PHD13003C,412 offers higher maximum power dissipation (2.1 W versus 1.1 W), providing additional thermal margin in applications operating near the STL73 power rating limits.
Selection of the PHD13003C,412 eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs utilizing the STL73.
Frequently Asked Questions (FAQ)
Q: Can the PHD13003C,412 be used as a direct replacement for the STL73 in existing designs?
A: Yes. Both devices share identical maximum voltage (400 V), current (1.5 A), and package specifications (TO-92-3 through-hole). Electrical and mechanical compatibility is complete.
Q: What is the primary difference between the STL73 and PHD13003C,412?
A: The PHD13003C,412 has higher maximum power dissipation (2.1 W versus 1.1 W) and is manufactured by WeEn Semiconductors with active product status, whereas the STL73 is obsolete. Voltage and current ratings are identical.
Q: Are both parts RoHS compliant?
A: Yes. Both the STL73 and PHD13003C,412 are ROHS3 compliant with identical moisture sensitivity level (MSL 1, Unlimited).
Q: Does the higher power rating of the PHD13003C,412 affect circuit operation?
A: No. Higher maximum power dissipation does not alter electrical performance. The PHD13003C,412 provides additional thermal design margin without changing voltage, current, or switching characteristics.
Q: Are there any package or pinout differences between these devices?
A: No. Both devices use identical TO-92-3 through-hole packaging with identical pin configuration.
Q: Why is the STL73 classified as obsolete?
A: The STL73 is no longer in active production. The PHD13003C,412 provides equivalent functionality with current manufacturing support.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts