MPF4392 Equivalent & Substitute Parts

Part Overview

The MPF4392 is an N-Channel JFET transistor rated for 30 V operation in a Through Hole TO-92 package. This device is classified as Obsolete, making identification of suitable substitutes essential for ongoing production and maintenance applications. The part delivers 350 mW maximum power dissipation and features a drain current (Idss) of 25 mA at 15 V with 60 Ohms on-state resistance.

Substiute Parts

MPF4392

onsemiIn Stock: 2188MPF4392 Datasheet

Current PartRFQ

MMBF4392LT1G

onsemiIn Stock: 242345MMBF4392LT1G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPF4392 is determined by electrical parameter equivalence and functional compatibility. The following criteria establish valid substitutes:

Electrical Equivalence Requirements:

• N-Channel JFET topology
• Drain to Source Voltage (Vdss): 30 V minimum
• Voltage - Breakdown (V(BR)GSS): 30 V minimum
• Current - Drain (Idss) @ Vds (Vgs=0): 25 mA @ 15 V
• Voltage - Cutoff (VGS off) @ Id: 2 V @ 10 nA
• Resistance - RDS(On): 60 Ohms
• Operating Temperature Range: -65°C to 150°C or equivalent

Package Compatibility: Substitutes may employ different mounting technologies (Through Hole or Surface Mount) provided electrical parameters remain within specification. Pin configuration must maintain functional equivalence for gate, drain, and source connections.

The MMBF4392LT1G qualifies as a direct electrical substitute, offering identical voltage and current ratings with equivalent on-state resistance and cutoff characteristics. The primary difference is packaging format: Surface Mount SOT-23-3 versus Through Hole TO-92-3.

Parameter Comparison

Engineering Selection Recommendations

The MMBF4392LT1G is the direct electrical equivalent of the MPF4392 from onsemi. Both devices share identical voltage ratings, drain current characteristics, and on-state resistance specifications.

Product Status Consideration: The MPF4392 is Obsolete. The MMBF4392LT1G carries Active product status with current manufacturing support and availability.

Compliance Status: The MPF4392 is RoHS non-compliant. The MMBF4392LT1G is ROHS3 Compliant, meeting current environmental and regulatory requirements for new designs and procurement.

Packaging Differences: The MPF4392 uses Through Hole TO-92-3 packaging; the MMBF4392LT1G uses Surface Mount SOT-23-3 packaging. Selection depends on circuit board assembly technology and layout requirements.

Power Dissipation: The MPF4392 is rated for 350 mW maximum power dissipation. The MMBF4392LT1G is rated for 225 mW. Applications requiring sustained power dissipation above 225 mW must account for this difference in thermal design.

Operating Temperature: The MPF4392 operates from -65°C to 150°C. The MMBF4392LT1G operates from -55°C to 150°C. Applications requiring operation below -55°C require the original MPF4392 or alternative parts with extended low-temperature ratings.

Frequently Asked Questions (FAQ)

Q: Can the MMBF4392LT1G directly replace the MPF4392 in existing circuits?

A: Electrical substitution is valid. The MMBF4392LT1G provides identical voltage, current, and resistance specifications. Circuit board redesign is required due to different package formats (Through Hole versus Surface Mount). Pin-to-pin functional mapping (gate, drain, source) must be verified against the specific application schematic.

Q: What are the key differences between these parts?

A: Primary differences are packaging format (TO-92-3 Through Hole versus SOT-23-3 Surface Mount), maximum power dissipation (350 mW versus 225 mW), minimum operating temperature (-65°C versus -55°C), and product status (Obsolete versus Active). Electrical parameters for voltage, current, and resistance are identical.

Q: Is the MMBF4392LT1G suitable for high-power applications?

A: The MMBF4392LT1G is rated for 225 mW maximum power dissipation. Applications requiring sustained dissipation above this level must use the original MPF4392 (350 mW) or identify alternative parts with higher power ratings.

Q: Does the MMBF4392LT1G meet current environmental standards?

A: Yes. The MMBF4392LT1G is ROHS3 Compliant. The original MPF4392 is RoHS non-compliant. New designs and procurement should prioritize the MMBF4392LT1G for regulatory compliance.

Q: What is the minimum operating temperature for each part?

A: The MPF4392 operates from -65°C to 150°C. The MMBF4392LT1G operates from -55°C to 150°C. Applications requiring operation below -55°C must use the MPF4392 or identify alternative parts with extended low-temperature specifications.

Q: Are there inventory considerations for these parts?

A: The MPF4392 (Obsolete) has 2,158 pieces in stock. The MMBF4392LT1G (Active) has 242,300 pieces in stock. Long-term availability and supply chain stability favor the MMBF4392LT1G.