MPSA29_D75Z Equivalent & Substitute Parts

Part Overview

The MPSA29_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 100 V, and operates across a temperature range of -55°C to 150°C. The component is packaged in a TO-92-3 through-hole configuration with formed leads.

The MPSA29_D75Z is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Substiute Parts

MPSA29_D75Z

onsemiIn Stock: 1014MPSA29_D75Z Datasheet

Current PartRFQ

ZTX614STZ

Diodes IncorporatedIn Stock: 3656ZTX614STZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPSA29_D75Z is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor type: NPN - Darlington configuration
• Maximum collector current: 800 mA
• Collector-emitter breakdown voltage: 100 V
• DC current gain (hFE): minimum 10000
• Operating temperature range: compatible with -55°C to 150°C minimum

Mechanical Equivalence Criteria:

• Mounting type: Through Hole
• Package compatibility: TO-92-3 or TO-92 compatible form factor
• Lead configuration: Formed leads

The ZTX614STZ manufactured by Diodes Incorporated meets these substitution criteria. This device maintains identical maximum collector current (800 mA) and collector-emitter breakdown voltage (100 V), operates within the required temperature range (-55°C to 200°C), and is packaged in an E-Line configuration that is physically and functionally compatible with TO-92 applications.

Parameter Comparison

Engineering Selection Recommendations

MPSA29_D75Z (onsemi): This component is classified as obsolete and carries no active RoHS or REACH compliance status beyond REACH Unaffected designation. Current inventory availability is limited to 957 pieces. Selection of this part is appropriate only for legacy system maintenance or when existing design validation specifically requires this manufacturer's device.

ZTX614STZ (Diodes Incorporated): This component is classified as active product status with ROHS3 compliance certification. Current inventory availability is 3600 pieces, providing superior supply chain continuity. The ZTX614STZ exceeds the electrical performance envelope of the MPSA29_D75Z with higher maximum power dissipation (1 W versus 625 mW) and extended maximum operating temperature (200°C versus 150°C). The E-Line package is physically and functionally compatible with TO-92 applications. This device is suitable for new designs and ongoing production requiring NPN Darlington transistors with 100 V, 800 mA specifications.

Frequently Asked Questions (FAQ)

Q: Can the ZTX614STZ directly replace the MPSA29_D75Z in existing circuit designs?

A: Yes. Both devices are NPN Darlington transistors with identical maximum collector current (800 mA) and collector-emitter breakdown voltage (100 V). The E-Line package of the ZTX614STZ is physically compatible with TO-92 through-hole applications. Pin configuration and lead spacing are equivalent, permitting direct substitution in PCB layouts designed for TO-92-3 components.

Q: What are the differences in saturation voltage between these devices?

A: The MPSA29_D75Z specifies Vce saturation of 1.5 V at 100 µA base current and 100 mA collector current. The ZTX614STZ specifies Vce saturation of 1.25 V at 8 mA base current and 800 mA collector current. These measurements are taken at different operating points and reflect different test conditions. Both devices meet Darlington saturation characteristics for switching applications.

Q: Why does the ZTX614STZ have higher maximum power dissipation?

A: The ZTX614STZ is rated for 1 W maximum power dissipation compared to 625 mW for the MPSA29_D75Z. This difference reflects the thermal design and package characteristics of the E-Line configuration. The higher power rating provides additional design margin for thermal management in applications operating near maximum current and voltage limits.

Q: Are there temperature range considerations for substitution?

A: The MPSA29_D75Z operates from -55°C to 150°C. The ZTX614STZ operates from -55°C to 200°C. For applications operating within the -55°C to 150°C range, both devices are functionally equivalent. For applications requiring operation above 150°C, only the ZTX614STZ is suitable.

Q: What is the significance of the DC current gain (hFE) specification?

A: Both devices specify a minimum DC current gain of 10000 at their respective test conditions. This high current gain is characteristic of Darlington transistor configurations and indicates strong amplification capability. The high hFE allows these devices to operate with minimal base drive current, making them suitable for logic-level switching applications.

Q: How does package compatibility affect circuit board design?

A: Both the TO-92-3 and E-Line packages use three leads with identical 0.1-inch (2.54 mm) spacing and through-hole mounting. PCB layouts designed for TO-92-3 components require no modification to accommodate the ZTX614STZ. Lead forming and insertion depth are equivalent between the two package styles.