MPS3703 Equivalent & Substitute Parts

Part Overview

The MPS3703 is a PNP bipolar junction transistor manufactured by onsemi, rated for 30 V collector-emitter breakdown voltage and 800 mA maximum collector current. Housed in a TO-92-3 through-hole package, this device is designed for general-purpose switching and amplification applications with a maximum power dissipation of 625 mW and operating temperature range of -55°C to 150°C.

The MPS3703 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this transistor is specified.

Substiute Parts

MPS3703

onsemiIn Stock: 3132MPS3703 Datasheet

Current PartRFQ

PN2907BU

Fairchild SemiconductorIn Stock: 22212PN2907BU Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPS3703 is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor polarity: PNP
• Maximum collector current: 800 mA (minimum requirement)
• Package type: TO-92-3 through-hole configuration
• Operating temperature range: -55°C to 150°C (minimum requirement)
• Maximum power dissipation: 625 mW (minimum requirement)

Allowable Variation Parameters:

• Collector-emitter breakdown voltage: Substitute must equal or exceed 30 V
• DC current gain (hFE): Substitute specifications may differ from the original
• Transition frequency: Substitute specifications may differ from the original
• Saturation voltage characteristics: Substitute specifications may differ from the original

The PN2907BU qualifies as a direct substitute because it maintains identical collector current rating (800 mA), identical power dissipation (625 mW), identical operating temperature range (-55°C to 150°C), identical package type (TO-92-3), and exceeds the minimum breakdown voltage requirement (40 V versus 30 V).

Parameter Comparison

Engineering Selection Recommendations

PN2907BU as Substitute for MPS3703:

The PN2907BU is a qualified substitute for the MPS3703 based on the following engineering criteria:

1. Electrical Equivalence: Both devices share identical maximum collector current (800 mA) and power dissipation (625 mW), which are the primary current-handling specifications for PNP transistor selection.

2. Voltage Rating: The PN2907BU provides a 40 V collector-emitter breakdown voltage, which exceeds the MPS3703 requirement of 30 V. This higher rating ensures the substitute operates safely within the original design envelope.

3. Thermal Compatibility: Both devices operate across the identical temperature range of -55°C to 150°C, ensuring thermal performance equivalence in target applications.

4. Package Compatibility: Both devices use the TO-92-3 through-hole package, providing direct mechanical and electrical pin compatibility without PCB layout modifications.

5. Product Status: The PN2907BU is classified as active, ensuring long-term availability and supply chain continuity compared to the obsolete MPS3703.

6. Compliance: Both devices carry EAR99 export classification and are REACH unaffected, maintaining regulatory compliance for international applications.

Frequently Asked Questions (FAQ)

Q: Can the PN2907BU directly replace the MPS3703 without circuit modifications?

A: Yes. The PN2907BU provides direct electrical and mechanical compatibility. Both devices share identical collector current (800 mA), power dissipation (625 mW), operating temperature range (-55°C to 150°C), and TO-92-3 package configuration. The higher breakdown voltage of the PN2907BU (40 V versus 30 V) does not require circuit changes and provides additional design margin.

Q: What is the significance of the different DC current gain (hFE) specifications between these devices?

A: The hFE values are measured at different test conditions (MPS3703: 30 @ 50mA, 5V; PN2907BU: 100 @ 150mA, 10V). These differences reflect manufacturer test methodology rather than fundamental incompatibility. For switching applications, the absolute hFE value is less critical than ensuring sufficient base drive. For linear amplification, circuit design should account for the specified gain at the intended operating point.

Q: Are there any package or pinout differences between the MPS3703 and PN2907BU?

A: No. Both devices use the TO-92-3 package with identical pin configuration. Direct socket substitution is possible without PCB rework.

Q: Why is the transition frequency not specified for the PN2907BU?

A: The transition frequency specification is not provided in the PN2907BU datasheet parameters. If high-frequency performance is critical to the application, the MPS3703 specification of 100 MHz should be verified against actual PN2907BU performance data from the manufacturer before final design approval.

Q: Is the PN2907BU suitable for high-temperature applications?

A: Yes. The PN2907BU maintains the same operating temperature range as the MPS3703 (-55°C to 150°C junction temperature), ensuring equivalent thermal performance in high-temperature environments.

Q: What is the inventory status difference between these parts?

A: The MPS3703 has 3,100 pieces in stock but is classified as obsolete. The PN2907BU has 22,103 pieces in stock and is classified as active. The active status of the PN2907BU ensures continued availability for future production requirements.