MD1802FX Equivalent & Substitute Parts

Part Overview

The MD1802FX is a Bipolar (BJT) NPN transistor manufactured by STMicroelectronics, rated for 700 V collector-emitter breakdown voltage and 10 A maximum collector current in an ISOWATT-218FX through-hole package. This device is classified as obsolete, indicating discontinuation from active production. Identification of equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where the MD1802FX specification requirements can be met by active alternatives.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	700	V
Current - Collector (Ic) (Max)	10	A
Power - Max	57	W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 1.25A, 5A	V
DC Current Gain (hFE) (Min) @ Ic, Vce	5.5 @ 5A, 5V	—
Current - Collector Cutoff (Max)	200	µA
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	ISOWATT218FX	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MD1802FX is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor type must be NPN
Collector-emitter breakdown voltage must be 700 V (minimum)
Maximum collector current must be equal to or greater than 10 A
Power dissipation rating must be equal to or greater than 57 W
Saturation voltage characteristics must be compatible with circuit requirements
DC current gain must support intended switching or amplification function

Mechanical Equivalence Criteria:

Package type must be ISOWATT-218FX
Mounting configuration must be through-hole
Physical dimensions must be identical for PCB compatibility

Compliance Criteria:

RoHS3 compliance required
MSL rating of 1 (Unlimited) required
REACH unaffected status required

The MD2001FX meets all substitution criteria and is classified as an active product with enhanced electrical performance characteristics.

Parameter Comparison

Parameter	MD1802FX	MD2001FX	Unit
Transistor Type	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	700	700	V
Current - Collector (Ic) (Max)	10	12	A
Power - Max	57	58	W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 1.25A, 5A	1.8V @ 1.5A, 6A	V
DC Current Gain (hFE) (Min) @ Ic, Vce	5.5 @ 5A, 5V	4.5 @ 6A, 5V	—
Current - Collector Cutoff (Max)	200	200	µA
Operating Temperature (TJ)	150	150	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	ISOWATT218FX	ISOWATT218FX	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

The MD2001FX is a direct substitute for the MD1802FX based on the following factors:

Product Status: The MD1802FX is obsolete, while the MD2001FX is active. Selection of the MD2001FX ensures continued component availability and supply chain stability for production and field service applications.

Electrical Performance: The MD2001FX exceeds the MD1802FX specification in maximum collector current (12 A versus 10 A) and maintains identical breakdown voltage (700 V). Both devices operate at the same maximum junction temperature (150°C). The MD2001FX is suitable for applications requiring the MD1802FX electrical performance envelope.

Compliance: Both devices are ROHS3 compliant, carry MSL rating 1 (Unlimited), and are REACH unaffected. No compliance barriers exist to substitution.

Mechanical Compatibility: Both devices use identical ISOWATT-218FX packaging and through-hole mounting configuration, ensuring direct PCB compatibility without layout modification.

Inventory Status: The MD2001FX maintains active inventory (2100 Pcs) compared to the MD1802FX obsolete status, supporting long-term design continuity.

Frequently Asked Questions (FAQ)

Q: Can the MD2001FX directly replace the MD1802FX in existing designs?

A: Yes. The MD2001FX meets all electrical and mechanical substitution criteria. Both devices share identical breakdown voltage (700 V), package type (ISOWATT-218FX), and mounting configuration (through-hole). The MD2001FX maximum collector current (12 A) exceeds the MD1802FX requirement (10 A), providing design margin.

Q: What are the key differences between MD1802FX and MD2001FX?

A: The MD2001FX provides higher maximum collector current (12 A versus 10 A) and slightly higher power rating (58 W versus 57 W). Saturation voltage is specified at higher current levels for the MD2001FX (1.8V @ 6A versus 1.5V @ 5A). DC current gain is lower for the MD2001FX (4.5 @ 6A versus 5.5 @ 5A). All other parameters remain equivalent.

Q: Are there packaging differences between these devices?

A: No. Both MD1802FX and MD2001FX use identical ISOWATT-218FX through-hole packaging. Physical dimensions, pin configuration, and PCB footprint are identical. No layout changes are required for substitution.

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

A: The MD1802FX is classified as obsolete, indicating discontinued production. The MD2001FX is active, ensuring ongoing availability from STMicroelectronics. For new designs and production runs, the MD2001FX provides supply chain continuity and eliminates obsolescence risk.

Q: Are both devices RoHS3 compliant?

A: Yes. Both MD1802FX and MD2001FX are ROHS3 compliant with MSL rating 1 (Unlimited) and REACH unaffected status. No compliance issues exist for substitution in regulated applications.

Q: Can the MD2001FX handle the same voltage and current as the MD1802FX?

A: Yes. The MD2001FX is rated for 700 V collector-emitter breakdown voltage (identical to MD1802FX) and 12 A maximum collector current (exceeding the MD1802FX 10 A rating). The device operates at the same maximum junction temperature (150°C).

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