D44H8 Equivalent & Substitute Parts

Part Overview

The D44H8 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. This through-hole TO-220 package device is rated for 60 V collector-emitter breakdown voltage and 10 A maximum collector current, with a maximum power dissipation of 50 W. The part maintains Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate application-specific performance requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	10	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Power - Max	50	W
Vce Saturation (Max)	1	V @ 400mA, 8A
DC Current Gain (hFE) (Min)	40	@ 4A, 1V
Current - Collector Cutoff (Max)	10	µA
Operating Temperature (Max)	150	°C (TJ)
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the D44H8 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage of 60 V or greater
Current Rating: Maximum collector current of 10 A or greater
Power Dissipation: Maximum power rating of 50 W or greater
Saturation Characteristics: Vce saturation performance suitable for switching applications

Mechanical Compatibility Criteria:

Package Type: TO-220-3 through-hole configuration
Mounting: Through-hole mounting compatibility
Pin Configuration: Standard TO-220 pinout

Compliance Requirements:

RoHS3 compliance
REACH unaffected status
Active product status

The MJE3055TG from onsemi meets all electrical and mechanical substitution criteria, with enhanced power rating (75 W) and extended operating temperature range (-55°C to 150°C).

Parameter Comparison

Parameter	D44H8 (STMicroelectronics)	MJE3055TG (onsemi)	Unit
Transistor Type	NPN	NPN	—
Current - Collector (Ic) (Max)	10	10	A
Voltage - Collector Emitter Breakdown (Max)	60	60	V
Power - Max	50	75	W
Vce Saturation (Max)	1 @ 400mA, 8A	8 @ 3.3A, 10A	V
DC Current Gain (hFE) (Min)	40 @ 4A, 1V	20 @ 4A, 4V	—
Current - Collector Cutoff (Max)	10	700	µA
Operating Temperature (Max)	150	150	°C (TJ)
Operating Temperature (Min)	—	-55	°C (TJ)
Package / Case	TO-220-3	TO-220-3	—
Mounting Type	Through Hole	Through Hole	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	—
Product Status	Active	Active	—

Engineering Selection Recommendations

D44H8 (STMicroelectronics): Select this part for applications requiring the specified electrical characteristics with STMicroelectronics supply chain preference. The part is Active, RoHS3 compliant, and REACH unaffected. Inventory availability is 17,186 pieces.

MJE3055TG (onsemi): This substitute part is suitable for applications where enhanced power dissipation (75 W versus 50 W) and extended low-temperature operating range (-55°C to 150°C) provide design advantages. The part is Active, RoHS3 compliant, and REACH unaffected. Inventory availability is 1,698 pieces. Note that saturation voltage and collector cutoff current specifications differ from the D44H8; circuit design must accommodate these parameter variations.

Both parts are through-hole TO-220-3 packages with identical voltage and current ratings, ensuring mechanical and electrical pin compatibility. Selection between these parts depends on thermal management requirements, temperature operating range, and manufacturer supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can the MJE3055TG directly replace the D44H8 in all applications?

A: Mechanical and electrical pin compatibility is confirmed for TO-220-3 through-hole mounting. However, differences in saturation voltage (1 V versus 8 V at specified test conditions) and collector cutoff current (10 µA versus 700 µA) require circuit verification. Applications with tight saturation voltage specifications or low-leakage requirements must be evaluated individually.

Q: What are the key differences between these parts?

A: The MJE3055TG provides higher maximum power dissipation (75 W versus 50 W), extended operating temperature range (-55°C to 150°C versus 150°C maximum), and higher transition frequency (2 MHz). The D44H8 exhibits lower saturation voltage and lower collector cutoff current at specified test conditions.

Q: Are both parts RoHS3 compliant?

A: Yes, both the D44H8 and MJE3055TG are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the package compatibility between these parts?

A: Both parts use the TO-220-3 through-hole package with identical pinout configuration, ensuring direct mechanical compatibility in PCB designs and thermal management solutions.

Q: Which part should be selected for high-temperature applications?

A: Both parts support maximum junction temperatures of 150°C. The MJE3055TG extends the minimum operating temperature to -55°C, providing broader temperature range coverage for applications requiring low-temperature operation.

Q: Are there inventory considerations for part selection?

A: The D44H8 has significantly higher inventory availability (17,186 pieces) compared to the MJE3055TG (1,698 pieces). Supply chain continuity and lead time requirements may influence part selection.

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