BUL98 Equivalent & Substitute Parts

Part Overview

The BUL98 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for high-voltage, high-current switching applications. The device features a 450 V collector-emitter breakdown voltage rating and 12 A maximum collector current in a TO-220 through-hole package. The BUL98 is classified as obsolete, necessitating identification of functionally equivalent substitute components for ongoing design support and procurement continuity. The PHE13009,127 from WeEn Semiconductors serves as a direct substitute for applications where the electrical parameters align with design requirements.

Substiute Parts

BUL98

STMicroelectronicsIn Stock: 1119BUL98 Datasheet

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PHE13009,127

WeEn SemiconductorsIn Stock: 695PHE13009,127 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BUL98 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor Type: NPN configuration required
• Package / Case: TO-220-3 form factor for mechanical compatibility
• Mounting Type: Through Hole for PCB integration
• Current - Collector (Ic) (Max): 12 A minimum rating
• Voltage - Collector Emitter Breakdown (Max): Minimum 400 V for voltage margin applications
• Operating Temperature: 150°C maximum junction temperature
• Moisture Sensitivity Level: MSL 1 (Unlimited) for standard handling

The PHE13009,127 meets all critical parameters with the following considerations: it maintains 12 A collector current capacity, operates at 400 V breakdown voltage (50 V lower than the BUL98), and is housed in the TO-220AB package variant. The substitute is classified as Active product status, ensuring ongoing availability and supply chain support.

Parameter Comparison

Engineering Selection Recommendations

BUL98 (STMicroelectronics): This component is obsolete and no longer recommended for new designs. Existing inventory of 1,033 pieces is available for legacy system support and repair applications. The device is ROHS3 compliant and carries REACH Unaffected status.

PHE13009,127 (WeEn Semiconductors): This substitute is classified as Active product status, ensuring long-term availability and supply chain reliability. The device is RoHS compliant and suitable for new design implementations. The 50 V reduction in breakdown voltage (400 V versus 450 V) and 30 W reduction in maximum power dissipation (80 W versus 110 W) require circuit-level evaluation to confirm compatibility with application voltage and thermal requirements. The lower DC current gain (8 versus 15 at specified conditions) may affect base drive requirements in switching applications.

Selection between the BUL98 and PHE13009,127 depends on application voltage headroom, thermal design margins, and base drive circuit design. Both devices share identical collector current capacity, operating temperature range, and package form factor.

Frequently Asked Questions (FAQ)

Q: Can the PHE13009,127 directly replace the BUL98 in existing designs?

A: Direct replacement is possible only if the application circuit operates at or below 400 V collector-emitter voltage and the thermal design accommodates the 80 W maximum power dissipation. The lower DC current gain of the PHE13009,127 may require base drive circuit adjustment. PCB layout and thermal management remain compatible due to identical TO-220-3 packaging.

Q: What is the significance of the 50 V voltage difference between the BUL98 (450 V) and PHE13009,127 (400 V)?

A: The BUL98 provides 50 V additional breakdown voltage margin. Applications operating near 400 V require the BUL98 or equivalent 450 V rated devices. Applications with maximum operating voltages below 350 V can safely use the PHE13009,127 with standard design margins.

Q: Are there thermal considerations when substituting the BUL98 with the PHE13009,127?

A: The PHE13009,127 has a 30 W lower maximum power dissipation rating (80 W versus 110 W). Thermal design must account for this reduced power handling capacity. Both devices share the same TO-220-3 package and 150°C maximum junction temperature, so heatsinking requirements depend on actual circuit power dissipation rather than package differences.

Q: How do the DC current gain specifications affect circuit design?

A: The BUL98 specifies minimum DC current gain (hFE) of 15 at 5 A collector current and 5 V collector-emitter voltage. The PHE13009,127 specifies minimum hFE of 8 at the same conditions. Lower current gain requires proportionally higher base drive current to achieve saturation. Base drive circuits must be recalculated for the substitute device.

Q: What is the difference between TO-220 and TO-220AB packaging?

A: Both designations refer to the same three-lead through-hole package form factor. TO-220AB is a variant designation used by some manufacturers. Mechanical compatibility, pin spacing, and mounting hole locations are identical. PCB layouts designed for TO-220-3 accommodate both variants without modification.

Q: Is the PHE13009,127 suitable for new product designs?

A: Yes. The PHE13009,127 is classified as Active product status, ensuring availability and supply chain continuity. The device is RoHS compliant and meets current environmental and regulatory requirements for new designs. Electrical parameter differences from the BUL98 require circuit validation before implementation.

Q: What compliance certifications apply to both devices?

A: The BUL98 is ROHS3 compliant and REACH unaffected. The PHE13009,127 is RoHS compliant. Both devices carry ECCN EAR99 classification and HTSUS code 8541.29.0095. Moisture sensitivity level is MSL 1 (Unlimited) for both, indicating standard handling requirements without special storage conditions.