2N5191 Equivalent & Substitute Parts

Part Overview

The 2N5191 is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, rated for 60 V collector-emitter breakdown voltage and 4 A maximum collector current in a TO-126 through-hole package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The 2N5191 was designed for general-purpose switching and amplification applications requiring moderate power dissipation up to 40 W and operation across a wide temperature range from -65°C to 150°C.

Substiute Parts

2N5191

Central Semiconductor CorpIn Stock: 45782N5191 Datasheet

Current PartRFQ

BD437G

onsemiIn Stock: 2117BD437G Datasheet

MFR RecommendedRFQ

BD787G

onsemiIn Stock: 1270BD787G Datasheet

MFR RecommendedRFQ

KSD1691GS

onsemiIn Stock: 5963KSD1691GS Datasheet

MFR RecommendedRFQ

KSD1691YS

onsemiIn Stock: 1621KSD1691YS Datasheet

MFR RecommendedRFQ

KSD1691YSTU

onsemiIn Stock: 35955KSD1691YSTU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N5191 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: NPN (required match)
• Voltage - Collector Emitter Breakdown: minimum 60 V
• Current - Collector (Ic) (Max): minimum 4 A
• Mounting Type: Through Hole (required match)
• Package / Case: TO-126-3 or TO-225AA (compatible packages)
• Operating Temperature Range: must encompass or match -65°C to 150°C

Substitute Parts Identified:

1. BD437G (onsemi) — Reduced voltage rating (45 V) with matching 4 A current rating. Active product status. Suitable for applications not requiring full 60 V rating.

2. BD787G (onsemi) — Matching 60 V and 4 A ratings. Active product status. Higher frequency capability (50 MHz vs. 2 MHz). Reduced power rating (15 W vs. 40 W).

3. KSD1691GS (onsemi) — Matching 60 V rating with increased current capability (5 A vs. 4 A). Active product status. Reduced power rating (1.3 W vs. 40 W). TO-126-3 package.

4. KSD1691YS (onsemi) — Identical electrical specifications to KSD1691GS. Active product status. TO-126-3 package.

5. KSD1691YSTU (onsemi) — Identical to KSD1691YS with tube packaging. Active product status. Highest inventory availability (35,885 pcs).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

BD787G is the primary substitute when full 60 V and 4 A ratings are required. This device maintains the voltage and current specifications of the 2N5191 while offering active product status and ROHS3 compliance. The reduced power rating (15 W vs. 40 W) must be evaluated against application requirements.

For Reduced Voltage Applications:

BD437G operates at 45 V maximum, suitable for applications where the full 60 V rating is not required. This device provides 36 W power dissipation and active product status with ROHS3 compliance.

For Enhanced Current Capability:

KSD1691GS, KSD1691YS, and KSD1691YSTU all provide 5 A maximum collector current with 60 V rating. These devices are active products with ROHS3 compliance. The significantly reduced power rating (1.3 W) restricts use to low-power applications. KSD1691YSTU offers the highest inventory availability in tube packaging.

Compliance Considerations:

All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. The 2N5191 obsolete status necessitates transition to one of these active alternatives for new production.

Frequently Asked Questions (FAQ)

Q: Can BD437G replace the 2N5191 in all applications?

A: BD437G operates at 45 V maximum collector-emitter breakdown voltage, compared to the 2N5191's 60 V rating. It is suitable only for applications where the supply voltage does not exceed 45 V. Both devices share 4 A maximum collector current and TO-126-3 packaging.

Q: What is the difference between KSD1691GS, KSD1691YS, and KSD1691YSTU?

A: These three devices are electrically identical, all rated for 60 V and 5 A with TO-126-3 packaging. The primary differences are packaging format (bulk vs. tube) and inventory availability. KSD1691YSTU is supplied in tube packaging with significantly higher stock levels (35,885 pcs).

Q: Why does BD787G have lower power rating than the 2N5191?

A: BD787G is optimized for higher frequency operation (50 MHz vs. 2 MHz), which results in a reduced maximum power dissipation specification (15 W vs. 40 W). Applications requiring sustained high power dissipation at low frequency should use BD437G or evaluate the KSD1691 series based on actual power requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All five substitute parts (BD437G, BD787G, KSD1691GS, KSD1691YS, KSD1691YSTU) carry ROHS3 Compliant status. The 2N5191 obsolete status predates modern RoHS requirements.

Q: Can KSD1691 devices replace the 2N5191 in high-power applications?

A: No. The KSD1691 series (all variants) is rated for only 1.3 W maximum power dissipation, compared to the 2N5191's 40 W rating. These devices are suitable only for low-power switching applications. For high-power requirements, use BD437G (36 W) or BD787G (15 W).

Q: What is the operating temperature range for substitute parts?

A: BD787G and the 2N5191 both operate from -65°C to 150°C. BD437G operates from -55°C to 150°C, which is acceptable for most industrial applications but does not extend to the full -65°C lower limit. KSD1691 variants specify operation to 150°C without explicit lower temperature limit in provided data.

Q: Is packaging compatibility guaranteed between TO-126-3 and TO-225AA designations?

A: Both designations refer to the same three-lead through-hole package format. All substitute parts and the 2N5191 use compatible TO-126-3 / TO-225AA packaging, ensuring mechanical and electrical pin compatibility.