MPSA27_D75Z Equivalent & Substitute Parts

Part Overview

The MPSA27_D75Z is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 800 mA, collector-emitter breakdown voltage of 60 V, and maximum power dissipation of 625 mW in a Through Hole TO-92-3 package. The MPSA27_D75Z is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including maximum ratings, saturation characteristics, and thermal operating range.

Substiute Parts

MPSA27_D75Z

onsemiIn Stock: 932MPSA27_D75Z Datasheet

Current PartRFQ

BCX38CSTZ

Diodes IncorporatedIn Stock: 2079BCX38CSTZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MPSA27_D75Z are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Electrical Compatibility Requirements:

• Transistor type must be NPN - Darlington
• Maximum collector current (Ic) must be ≥ 800 mA
• Collector-emitter breakdown voltage (VCEO) must be ≥ 60 V
• DC current gain (hFE) minimum must be ≥ 10000
• Operating temperature range must encompass or exceed -55°C to 150°C

Mechanical Compatibility Requirements:

• Mounting type must be Through Hole
• Package must be TO-92-3 or TO-92 compatible form factor

Compliance Considerations:

• Moisture Sensitivity Level (MSL) of 1 (Unlimited) is acceptable
• REACH and ECCN compliance status must be maintained

The BCX38CSTZ meets all substitution criteria and is classified as an active product, providing superior long-term availability compared to the obsolete MPSA27_D75Z.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: BCX38CSTZ

The BCX38CSTZ from Diodes Incorporated is the qualified substitute for the obsolete MPSA27_D75Z. Selection is based on the following engineering factors:

Electrical Equivalence: All critical electrical parameters meet or exceed the MPSA27_D75Z specifications. The BCX38CSTZ delivers identical maximum collector current (800 mA) and collector-emitter breakdown voltage (60 V). The DC current gain minimum of 10000 matches the original device. The BCX38CSTZ exhibits superior saturation characteristics (1.25 V versus 1.5 V) and lower collector cutoff current (100 nA versus 500 nA), indicating improved switching performance.

Thermal and Power Advantages: The BCX38CSTZ provides 1 W maximum power dissipation compared to 625 mW for the MPSA27_D75Z, offering 60% additional thermal headroom. The extended operating temperature range (-55°C to 200°C) provides 50°C additional high-temperature capability, supporting applications in elevated ambient conditions.

Mechanical Compatibility: The E-Line-3 package is mechanically and electrically compatible with TO-92-3 form factor. Through-hole mounting is maintained, allowing direct board-level substitution without layout modifications.

Compliance and Availability: The BCX38CSTZ maintains REACH Unaffected and EAR99 ECCN status, ensuring regulatory compliance. As an active product with 2053 units in stock, the BCX38CSTZ provides superior long-term supply security compared to the obsolete MPSA27_D75Z.

Frequently Asked Questions (FAQ)

Q: Can the BCX38CSTZ be used as a direct replacement for the MPSA27_D75Z in existing designs?

A: Yes. The BCX38CSTZ is electrically and mechanically compatible with the MPSA27_D75Z. Both devices are NPN Darlington transistors with identical maximum collector current (800 mA) and collector-emitter breakdown voltage (60 V). The E-Line-3 package is TO-92 compatible and fits standard TO-92-3 board layouts without modification.

Q: What are the key differences between these two devices?

A: The BCX38CSTZ offers three primary advantages: (1) Lower Vce saturation (1.25 V versus 1.5 V), resulting in reduced power dissipation during switching; (2) Higher maximum power rating (1 W versus 625 mW), providing additional thermal margin; (3) Extended operating temperature range (-55°C to 200°C versus -55°C to 150°C), supporting high-temperature applications. The BCX38CSTZ also features lower collector cutoff current (100 nA versus 500 nA).

Q: Are there any package considerations when substituting the BCX38CSTZ for the MPSA27_D75Z?

A: The BCX38CSTZ uses an E-Line-3 package, which is mechanically and electrically equivalent to the TO-92-3 package. Both are three-lead through-hole devices with identical lead spacing and polarity. No board layout or footprint modifications are required.

Q: What is the product status difference, and why does it matter?

A: The MPSA27_D75Z is classified as obsolete, indicating onsemi has discontinued production and support. The BCX38CSTZ is an active product from Diodes Incorporated, ensuring ongoing availability, technical support, and supply chain continuity. For new designs and long-term production, the BCX38CSTZ is the recommended choice.

Q: Do both devices have the same moisture sensitivity level?

A: Yes. Both the MPSA27_D75Z and BCX38CSTZ have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture-related handling restrictions during storage, transport, or assembly.

Q: Are there any regulatory or compliance differences?

A: No. Both devices maintain REACH Unaffected status and EAR99 ECCN classification. Regulatory compliance is equivalent, and substitution does not introduce compliance concerns.