BUT11APX,127 Equivalent & Substitute Parts

Part Overview

The BUT11APX,127 is an NPN bipolar junction transistor manufactured by NXP USA Inc., designed for high-voltage switching applications. This device features a collector-emitter breakdown voltage of 450 V and a maximum collector current of 5 A, with a maximum power dissipation of 32 W in a Through Hole TO-220F package configuration. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

BUT11APX,127

NXP USA Inc.In Stock: 1173BUT11APX,127 Datasheet

Current PartRFQ

BUT11A

STMicroelectronicsIn Stock: 2451BUT11A Datasheet

MFR RecommendedRFQ

BUT11AFTU

onsemiIn Stock: 2203BUT11AFTU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BUT11APX,127 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Transistor Type: NPN configuration required
• Voltage - Collector Emitter Breakdown (Max): 450 V minimum
• Current - Collector (Ic) (Max): 5 A minimum
• Vce Saturation (Max): 1.5 V or lower at specified bias conditions
• Current - Collector Cutoff (Max): 1 mA or lower
• Operating Temperature: 150°C (TJ) minimum
• Mounting Type: Through Hole
• Package / Case: TO-220 series configuration
• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

The substitute parts identified below meet all critical electrical parameters and compliance requirements. Variations in maximum power dissipation and DC current gain do not disqualify substitution when all voltage, current, and thermal specifications are satisfied.

Parameter Comparison

Engineering Selection Recommendations

BUT11A (STMicroelectronics): This substitute meets all critical electrical specifications and maintains ROHS3 compliance and REACH unaffected status. The higher maximum power dissipation (83 W versus 32 W) provides additional thermal margin in applications. However, this part shares obsolete product status with the original component, limiting long-term availability.

BUT11AFTU (onsemi): This substitute satisfies all electrical and compliance requirements while maintaining active product status. The 40 W maximum power dissipation exceeds the original 32 W specification, providing thermal headroom. Active product status ensures continued availability and manufacturing support. Packaging is specified as Tube, and the device is classified as ROHS3 Compliant with REACH Unaffected status.

For new designs or long-term production requirements, BUT11AFTU is preferred due to active product status. For legacy system maintenance where component availability is already constrained, BUT11A provides an immediate alternative with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can BUT11A or BUT11AFTU be used as direct replacements for BUT11APX,127?

A: Both substitute parts meet the critical electrical parameters: 450 V collector-emitter breakdown voltage, 5 A maximum collector current, 1.5 V maximum saturation voltage, and 1 mA maximum cutoff current. All three devices are Through Hole mounted in TO-220 series packages and maintain identical compliance certifications. Direct substitution is supported from an electrical and mechanical standpoint.

Q: What is the significance of the different maximum power ratings (32 W, 83 W, 40 W)?

A: Maximum power dissipation indicates the thermal capability of the device under specified conditions. Higher power ratings do not affect substitution eligibility when all voltage and current specifications are met. The higher ratings in BUT11A and BUT11AFTU provide additional thermal margin, which is beneficial in applications approaching the original device's power limits.

Q: Does the difference in DC Current Gain (hFE) affect substitution?

A: The DC Current Gain specifications provided are minimum values at specific bias points. BUT11APX,127 specifies 14 @ 500mA, 5V, while BUT11A specifies 10 @ 500mA, 5V. Both values are within acceptable ranges for switching applications. BUT11AFTU does not specify hFE in the provided data. Variations in current gain do not disqualify substitution when all voltage and current specifications are satisfied.

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

A: Both are Through Hole TO-220 series packages. The "F" designation indicates a full pack configuration with an isolated tab. The standard TO-220 package also supports isolated tab configurations. All three devices are compatible with standard TO-220 footprints and mounting hardware.

Q: Why is BUT11AFTU recommended for new applications?

A: BUT11AFTU maintains active product status, ensuring continued manufacturing support and availability. The original BUT11APX,127 and the substitute BUT11A are both classified as obsolete, which may result in limited stock and eventual discontinuation. For designs requiring long-term component supply, active status is a significant advantage.

Q: Are there any compliance or regulatory differences between these parts?

A: All three devices are ROHS3 Compliant and REACH Unaffected. Moisture Sensitivity Level (MSL) for BUT11APX,127 and BUT11A is 1 (Unlimited), while BUT11AFTU is listed as Not Applicable. These differences do not affect substitution eligibility for standard through-hole assembly processes.