STD155N3H6 Equivalent & Substitute Parts

Part Overview

The STD155N3H6 is an N-Channel 30V 80A MOSFET manufactured by STMicroelectronics in the DeepGATE™ and STripFET™ VI series. This surface mount device is housed in a DPAK (TO-252-3) package and is rated for 110W power dissipation at case temperature. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and surface mount DPAK packaging to ensure functional equivalence in existing applications.

Key Parameters

Parameter	STD155N3H6 Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	80	A (Tc)
On-Resistance (Rds On) @ 40A, 10V	3	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	62	nC
Power Dissipation (Max)	110	W (Tc)
Operating Temperature Range	−55 to 175	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STD155N3H6 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-Source Voltage (Vdss): Must equal 30V
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)
Mounting Type: Must be Surface Mount
Package: Must be TO-252-3 / DPAK (2 Leads + Tab) / SC-63

Secondary Compatibility Parameters:

Continuous Drain Current (Id) @ 25°C: Substitute must meet or exceed 80A (Tc)
On-Resistance (Rds On): Substitute must not exceed 3mOhm at rated conditions
Operating Temperature Range: Must support −55°C to 175°C (TJ)
Compliance: Must be RoHS3 Compliant

Substitute parts are grouped into two categories based on current rating capability:

Category A – Direct Current Equivalents (80A to 100A range): Parts with continuous drain current ratings between 80A and 100A at case temperature, maintaining comparable on-resistance and power dissipation characteristics.

Category B – Higher Current Capability (160A+ range): Parts with continuous drain current ratings of 160A or higher, offering enhanced current handling with comparable or lower on-resistance, suitable for applications requiring additional thermal or current margin.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Dissipation (W)	Package	Status
STD155N3H6	STMicroelectronics	30	80 (Tc)	3.0 @ 40A, 10V	62 @ 10V	110 (Tc)	TO-252-3 DPAK	Obsolete
AOD508	Alpha & Omega Semiconductor	30	70 (Tc)	3.0 @ 20A, 10V	49 @ 10V	50 (Tc)	TO-252 DPAK	Not For New Designs
FDD8870	onsemi	30	160 (Tc)	3.9 @ 35A, 10V	118 @ 10V	160 (Tc)	TO-252-3 DPAK	Obsolete
IPD031N03LGATMA1	Infineon Technologies	30	90 (Tc)	3.1 @ 30A, 10V	51 @ 10V	94 (Tc)	TO-252-3 DPAK	Active
IPD90N03S4L03ATMA1	Infineon Technologies	30	90 (Tc)	3.3 @ 90A, 10V	75 @ 10V	94 (Tc)	TO-252-3 DPAK	Last Time Buy
IRLR7843TRLPBF	Infineon Technologies	30	161 (Tc)	3.3 @ 15A, 10V	50 @ 4.5V	140 (Tc)	TO-252AA DPAK	Not For New Designs
IRLR8743TRPBF	Infineon Technologies	30	160 (Tc)	3.1 @ 25A, 10V	59 @ 4.5V	135 (Tc)	TO-252AA DPAK	Active
NP90N03VHG-E1-AY	Renesas Electronics	30	90 (Tc)	3.2 @ 45A, 10V	135 @ 10V	105 (Tc)	TO-252 DPAK	Active

Engineering Selection Recommendations

For Direct Replacement (Minimal Design Changes):

IPD031N03LGATMA1 and NP90N03VHG-E1-AY are suitable direct replacements. Both maintain 30V Vdss, support 90A continuous drain current, and are housed in TO-252-3 DPAK packages. IPD031N03LGATMA1 carries Active product status from Infineon Technologies, ensuring long-term availability and supply chain stability. NP90N03VHG-E1-AY is also Active from Renesas Electronics. Both parts are RoHS3 Compliant and operate across the full −55°C to 175°C temperature range.

For Enhanced Current Capability:

IRLR8743TRPBF provides 160A continuous drain current with 3.1mOhm on-resistance and Active product status. This part is suitable for applications requiring additional current margin or thermal headroom while maintaining the same 30V voltage rating and DPAK package form factor. Power dissipation capability increases to 135W (Tc).

For Legacy System Support:

FDD8870 (onsemi, PowerTrench® series) and IRLR7843TRLPBF (Infineon, HEXFET® series) are obsolete or not recommended for new designs but remain available in inventory. These parts support 160A+ current ratings and are electrically compatible with the STD155N3H6 across all critical parameters.

Compliance Verification:

All substitute parts listed are RoHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can AOD508 be used as a direct substitute for STD155N3H6?

A: AOD508 meets the 30V Vdss and DPAK package requirements but has a continuous drain current rating of 70A (Tc), which is below the STD155N3H6 specification of 80A. This part is suitable only for applications where the actual operating current does not exceed 70A. AOD508 is classified as Not For New Designs.

Q: What is the difference between TO-252 and TO-252AA packaging?

A: Both are DPAK variants with identical mechanical form factors (2 Leads + Tab, SC-63). TO-252AA is a variant designation used by some manufacturers. All parts listed are mechanically compatible in the same PCB footprint.

Q: Why do some substitute parts have higher gate charge (Qg) values?

A: Gate charge is determined by the internal capacitance and switching characteristics of the MOSFET die. Higher Qg values (such as NP90N03VHG-E1-AY at 135nC) indicate different die designs but do not affect functional substitution. Gate charge affects gate driver requirements and switching speed but does not prevent electrical substitution if the driver circuit is rated for the higher charge.

Q: Is IPD90N03S4L03ATMA1 suitable for new designs?

A: IPD90N03S4L03ATMA1 is classified as Last Time Buy, indicating that Infineon has announced end-of-life for this part. For new designs requiring long-term supply assurance, IPD031N03LGATMA1 (Active status) or IRLR8743TRPBF (Active status) are preferred alternatives.

Q: Can I use IRLR8743TRPBF in place of STD155N3H6 without circuit modifications?

A: IRLR8743TRPBF is electrically compatible across all critical parameters: 30V Vdss, 160A continuous drain current (exceeds 80A requirement), 3.1mOhm on-resistance, and identical DPAK package. No circuit modifications are required. The higher current rating provides additional design margin.

Q: What is the significance of the different Vgs(th) values among substitute parts?

A: Gate threshold voltage (Vgs(th)) varies between manufacturers and die designs. STD155N3H6 specifies 4V @ 250µA, while most substitutes specify 2.2V to 2.5V @ 250µA. Lower threshold voltages allow operation with lower gate drive voltages. This difference does not prevent substitution but may affect gate driver circuit design if the driver is marginal.

Q: Are all listed parts available in the same tape and reel packaging options?

A: Packaging options vary by supplier. IPD031N03LGATMA1 is supplied in Tape & Reel (TR), while IPD90N03S4L03ATMA1 is supplied in Cut Tape (CT). Verify packaging availability with your distributor to match your assembly process requirements.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts support the full −55°C to 175°C (TJ) operating range, matching the STD155N3H6 specification. NP90N03VHG-E1-AY specifies only 175°C maximum; verify the minimum temperature specification with the manufacturer if operation below −55°C is required.

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