IXST15N120B Equivalent & Substitute Parts

Part Overview

The IXST15N120B is a 1200V, 30A IGBT (Insulated Gate Bipolar Transistor) rated for 150W maximum power dissipation in a Surface Mount TO-268AA package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The IXST15N120B serves as a high-voltage switching element in power conversion applications requiring robust collector-emitter voltage ratings and moderate current handling capacity.

Key Parameters

Parameter	Value	Unit
Voltage - Collector Emitter Breakdown (Max)	1200	V
Current - Collector (Ic) (Max)	30	A
Current - Collector Pulsed (Icm)	60	A
Power - Max	150	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	TO-268-3, D³Pak (2 Leads + Tab), TO-268AA	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution of the IXST15N120B is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - Collector Emitter Breakdown (Max): 1200V
Current - Collector (Ic) (Max): 30A
Current - Collector Pulsed (Icm): 60A
Power - Max: 150W
Package / Case: TO-268-3, D³Pak (2 Leads + Tab), TO-268AA
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (TJ)

The IXGT15N120BD1 meets all mandatory matching parameters and qualifies as a direct substitute. Both components share identical voltage, current, power, and thermal specifications within the same physical package footprint, enabling direct PCB-level replacement without design modification.

Parameter Comparison

Parameter	IXST15N120B	IXGT15N120BD1	Unit
Voltage - Collector Emitter Breakdown (Max)	1200	1200	V
Current - Collector (Ic) (Max)	30	30	A
Current - Collector Pulsed (Icm)	60	60	A
Vce(on) (Max) @ Vge, Ic	3.4V @ 15V, 15A	3.2V @ 15V, 15A	V
Power - Max	150	150	W
Switching Energy (off)	1.5	1.75	mJ
Input Type	Standard	Standard	-
Gate Charge	57	69	nC
Td (on/off) @ 25°C	30ns/148ns	25ns/150ns	ns
Operating Temperature	-55 to 150	-55 to 150	°C (TJ)
Package / Case	TO-268-3, D³Pak (2 Leads + Tab), TO-268AA	TO-268-3, D³Pak (2 Leads + Tab), TO-268AA	-
Mounting Type	Surface Mount	Surface Mount	-
Test Condition	960V, 15A, 10Ohm, 15V	960V, 15A, 10Ohm, 15V	-

Engineering Selection Recommendations

The IXGT15N120BD1 is the qualified substitute for the obsolete IXST15N120B. Selection rationale is based on the following factors:

Product Status: The IXST15N120B carries obsolete status, while the IXGT15N120BD1 maintains active product status, ensuring continued availability and manufacturing support.

Compliance & Certifications: The IXGT15N120BD1 is RoHS3 Compliant and maintains REACH Unaffected status, meeting current regulatory requirements. Both components share identical ECCN (EAR99) and HTSUS (8541.29.0095) classifications.

Electrical Equivalence: All critical electrical parameters—voltage rating, current capacity, power dissipation, and thermal operating range—are identical between the two parts. Minor variations in switching energy (1.75mJ vs. 1.5mJ), gate charge (69nC vs. 57nC), and on-state voltage (3.2V vs. 3.4V) fall within acceptable engineering tolerances for most applications and may result in improved performance characteristics.

Physical Compatibility: Both components utilize identical TO-268AA Surface Mount packaging, enabling direct PCB-level substitution without layout modification or thermal management redesign.

Frequently Asked Questions (FAQ)

Q: Can the IXGT15N120BD1 replace the IXST15N120B in existing designs?

A: Yes. The IXGT15N120BD1 meets all mandatory electrical and mechanical specifications of the IXST15N120B. Direct substitution is supported at the PCB level without design modification.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete vs. active), compliance certifications (IXGT15N120BD1 is RoHS3 Compliant), and minor variations in switching characteristics. The IXGT15N120BD1 exhibits lower on-state voltage (3.2V vs. 3.4V) and faster turn-on delay (25ns vs. 30ns), which may improve efficiency in switching applications.

Q: Are the package footprints identical?

A: Yes. Both components use the TO-268-3 D³Pak (2 Leads + Tab) TO-268AA Surface Mount package. PCB footprints are directly compatible.

Q: What is the operating temperature range for both parts?

A: Both the IXST15N120B and IXGT15N120BD1 operate across a junction temperature range of -55°C to 150°C (TJ).

Q: Are there any compliance or regulatory differences?

A: The IXGT15N120BD1 is RoHS3 Compliant, while the IXST15N120B does not carry this certification. Both maintain REACH Unaffected status and share identical ECCN and HTSUS classifications.

Q: What is the maximum collector current rating?

A: Both parts are rated for 30A maximum continuous collector current (Ic) with a pulsed rating of 60A (Icm).

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: Yes. Both components share identical switching test conditions (960V, 15A, 10Ohm, 15V) and operate within the same thermal envelope. Minor differences in gate charge and switching delays are within acceptable tolerances for standard power conversion applications.

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