STB155N3LH6 Equivalent & Substitute Parts

Part Overview

The STB155N3LH6 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 30V drain-to-source voltage and 80A continuous drain current at 25°C. This device is housed in a TO-263 (D2PAK) surface mount package and is part of the DeepGATE™ and STripFET™ VI series. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design flexibility across manufacturing sources is required. The substitute devices listed maintain electrical compatibility within the specified parameter ranges while offering alternative packaging or performance characteristics.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	80	A (Tc)
RDS(on) Max @ 40A, 10V	3	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.5	V
Gate Charge (Qg) @ 5V	80	nC
Power Dissipation (Max)	110	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-263 (D2PAK)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the STB155N3LH6 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 30V
Continuous Drain Current (Id) must support 80A or higher at 25°C
RDS(on) characteristics must remain within acceptable limits for the application
Gate threshold voltage (Vgs(th)) must fall within the ±20V maximum gate voltage specification
Operating temperature range must encompass -55°C to 175°C

Mechanical Compatibility Criteria:

Surface mount technology required
Package footprint compatibility (TO-263 D2PAK or equivalent TO-252 variants acceptable for board redesign scenarios)
Lead configuration: 2 Leads + Tab standard

Compliance Requirements:

RoHS3 compliance mandatory
MSL 1 (Unlimited) moisture sensitivity level
REACH Unaffected status

The three substitute parts listed (AOD508, FDD8870, IPD90N03S4L03ATMA1) meet these electrical and mechanical criteria while offering variations in current handling, power dissipation, and package form factors.

Parameter Comparison

Parameter	STB155N3LH6 (Main)	AOD508	FDD8870	IPD90N03S4L03ATMA1
Manufacturer	STMicroelectronics	Alpha & Omega Semiconductor	onsemi	Infineon Technologies
Vdss (V)	30	30	30	30
Id @ 25°C (A)	80 (Tc)	70 (Tc)	160 (Tc)	90 (Tc)
RDS(on) Max (mOhm)	3 @ 40A, 10V	3 @ 20A, 10V	3.9 @ 35A, 10V	3.3 @ 90A, 10V
Vgs(th) Max (V)	2.5 @ 250µA	2.2 @ 250µA	2.5 @ 250µA	2.2 @ 45µA
Gate Charge Qg (nC)	80 @ 5V	49 @ 10V	118 @ 10V	75 @ 10V
Power Dissipation Max (W)	110 (Tc)	50 (Tc)	160 (Tc)	94 (Tc)
Operating Temperature (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-263 (D2PAK)	TO-252 (DPAK)	TO-252AA (DPAK)	PG-TO252-3-11 (DPAK)
Product Status	Active	Not For New Designs	Obsolete	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Selection: STB155N3LH6

The STB155N3LH6 maintains Active product status with full manufacturing support and availability. This part is the preferred choice for new designs and ongoing production due to its current product lifecycle status and established supply chain.

Secondary Selection: IPD90N03S4L03ATMA1 (Infineon Technologies)

The IPD90N03S4L03ATMA1 provides electrical compatibility with the STB155N3LH6 across all critical parameters. This device delivers 90A continuous drain current, exceeding the 80A requirement, and maintains equivalent RDS(on) performance at 3.3mOhm. The part is housed in a TO-252 (DPAK) package, which requires PCB layout modification but offers identical electrical performance. The device carries Last Time Buy status, indicating limited future availability. RoHS3 compliance and MSL 1 rating match the primary part.

Tertiary Selection: FDD8870 (onsemi)

The FDD8870 offers the highest current capability at 160A (Tc) and maximum power dissipation of 160W, providing significant performance headroom. This part is rated for 30V Vdss and maintains RDS(on) characteristics within acceptable limits. However, the FDD8870 carries Obsolete product status, restricting its use to legacy system support or inventory replacement scenarios only. RoHS3 compliance and MSL 1 rating are maintained.

Not Recommended: AOD508 (Alpha & Omega Semiconductor)

The AOD508 is designated Not For New Designs and carries a maximum continuous drain current of 70A (Tc), which falls below the 80A specification of the primary part. While electrical parameters remain compatible, the reduced current rating and product lifecycle status make this part unsuitable for new applications.

Frequently Asked Questions (FAQ)

Q: Can the IPD90N03S4L03ATMA1 directly replace the STB155N3LH6 without PCB modification?

A: The IPD90N03S4L03ATMA1 uses a TO-252 (DPAK) package, while the STB155N3LH6 uses TO-263 (D2PAK). These packages have different footprints and pin configurations. Direct socket replacement is not possible without PCB redesign. However, electrical performance is compatible.

Q: What is the significance of the "Last Time Buy" status for the IPD90N03S4L03ATMA1?

A: Last Time Buy status indicates that Infineon has announced the end of production for this device. Existing inventory may be available, but future procurement will not be possible. This part is suitable for current production runs but not for long-term supply planning.

Q: Why does the FDD8870 show Obsolete status?

A: Obsolete status means the manufacturer has discontinued production and support for this device. The FDD8870 should be used only for replacement in existing systems or legacy applications where no alternative exists. New designs must not incorporate this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (AOD508, FDD8870, IPD90N03S4L03ATMA1) carry RoHS3 compliance certification, matching the primary STB155N3LH6 part.

Q: What is the difference between continuous drain current ratings at Ta versus Tc?

A: Ta (ambient temperature) ratings reflect performance at 25°C ambient conditions in a standard test environment. Tc (case temperature) ratings reflect performance when the device case reaches the specified temperature, typically under thermal management conditions. Tc ratings are generally higher and represent the device's capability under active cooling or thermal interface conditions.

Q: Can the AOD508 be used as a substitute despite its lower current rating?

A: The AOD508 is rated for 70A (Tc) continuous drain current, which is below the 80A requirement of the STB155N3LH6. Additionally, the AOD508 carries Not For New Designs status. This part is not suitable for applications requiring the full 80A specification and should not be selected for new designs.

Q: What package considerations apply when switching between TO-263 and TO-252 variants?

A: TO-263 (D2PAK) and TO-252 (DPAK) packages have different physical dimensions, lead spacing, and thermal characteristics. Switching between these packages requires PCB layout redesign, including trace routing, thermal via placement, and mechanical clearance verification. Thermal performance may differ due to variations in case-to-ambient thermal resistance.

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