MPSA29RLRPG Equivalent & Substitute Parts

Part Overview

The MPSA29RLRPG is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for through-hole applications in the TO-92 package. This device operates at a maximum collector voltage of 100 V with a maximum collector current of 500 mA and dissipates up to 625 mW. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	100	V
Vce Saturation (Max)	1.5	V @ 100µA, 100mA
DC Current Gain (hFE Min)	10000	@ 100mA, 5V
Power Dissipation (Max)	625	mW
Transition Frequency	200	MHz
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package	TO-92-3 (TO-226)	—

Substitute Part Grouping Explanation

Substitution of the obsolete MPSA29RLRPG is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN - Darlington configuration
Collector-emitter breakdown voltage must be equal to or greater than 100 V
Collector current rating must be equal to or greater than 500 mA
Vce saturation characteristics must be compatible at specified bias conditions
DC current gain (hFE) must meet or exceed 10000 @ 100mA, 5V
Power dissipation rating must support 625 mW operation
Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

Package must be TO-92-3 (TO-226) through-hole configuration
Lead formation and pinout must be compatible with existing PCB layouts

The MPSA29 from onsemi qualifies as a direct substitute, meeting all electrical parameters while offering enhanced current capability and active product status.

Parameter Comparison

Parameter	MPSA29RLRPG (Main Part)	MPSA29 (Substitute)	Compatibility
Transistor Type	NPN - Darlington	NPN - Darlington	Match
Collector Current (Max)	500 mA	800 mA	Compatible (Higher Rating)
Collector-Emitter Breakdown Voltage (Max)	100 V	100 V	Match
Vce Saturation (Max)	1.5 V @ 100µA, 100mA	1.5 V @ 100µA, 100mA	Match
DC Current Gain (hFE Min)	10000 @ 100mA, 5V	10000 @ 100mA, 5V	Match
Power Dissipation (Max)	625 mW	625 mW	Match
Transition Frequency	200 MHz	125 MHz	Compatible (Lower Frequency)
Operating Temperature Range	-55 to 150°C (TJ)	-55 to 150°C (TJ)	Match
Mounting Type	Through Hole	Through Hole	Match
Package	TO-92-3 (TO-226)	TO-92-3 (TO-226AA)	Match
Product Status	Obsolete	Active	Upgrade Path

Engineering Selection Recommendations

The MPSA29 from onsemi is the appropriate substitute for the obsolete MPSA29RLRPG. This substitution is supported by the following factors:

Electrical Equivalence: The MPSA29 maintains identical electrical specifications for all critical parameters including breakdown voltage, saturation voltage, current gain, power rating, and operating temperature range. The higher collector current rating of 800 mA provides additional design margin beyond the 500 mA requirement of the original part.

Product Status: The MPSA29 carries active product status with RoHS3 compliance and REACH unaffected designation, ensuring long-term availability and regulatory alignment. The obsolete status of MPSA29RLRPG necessitates transition to an active equivalent.

Package Compatibility: Both parts utilize the TO-92-3 (TO-226) through-hole package with compatible pinout and lead formation, enabling direct PCB layout compatibility without redesign.

Compliance: The MPSA29 maintains REACH unaffected status and EAR99 ECCN classification consistent with the original part, with the addition of RoHS3 compliance for enhanced regulatory coverage.

Frequently Asked Questions (FAQ)

Q: Can the MPSA29 directly replace the MPSA29RLRPG without circuit modification?

A: Yes. The MPSA29 is electrically and mechanically equivalent to the MPSA29RLRPG across all critical parameters. The identical breakdown voltage, saturation voltage, current gain, and power rating ensure functional compatibility. The higher collector current rating of the MPSA29 provides additional design margin without requiring circuit changes.

Q: What is the difference between the transition frequency specifications of these parts?

A: The MPSA29RLRPG specifies 200 MHz transition frequency while the MPSA29 specifies 125 MHz. For applications operating below 125 MHz, this difference is not functionally significant. Applications requiring operation above 125 MHz should evaluate frequency-dependent performance characteristics.

Q: Are the TO-92-3 and TO-226AA package designations interchangeable?

A: Yes. Both designations refer to the same three-lead through-hole package configuration. TO-226-3 and TO-226AA are equivalent package standards with identical pinout, lead spacing, and mechanical dimensions suitable for the same PCB footprints.

Q: Why is the MPSA29RLRPG classified as obsolete?

A: The MPSA29RLRPG is an older product variant that has been superseded by the active MPSA29 part number. The base MPSA29 designation represents the current production equivalent with identical electrical performance and enhanced availability.

Q: What inventory considerations apply to this substitution?

A: The MPSA29 maintains significantly higher inventory levels (2869 pieces) compared to the obsolete MPSA29RLRPG variant, ensuring reliable procurement for new designs and ongoing production support.

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

A: The MPSA29 includes RoHS3 compliance certification, providing enhanced regulatory coverage for applications subject to RoHS directives. Both parts maintain REACH unaffected status and EAR99 ECCN classification.

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