NDS8425 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The NDS8425 is an N-Channel MOSFET manufactured by onsemi in the PowerTrench® series, rated for 20V drain-to-source voltage with 7.4A continuous drain current at 25°C. The device is packaged in 8-SOIC surface mount configuration with a maximum power dissipation of 2.5W. The NDS8425 is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while offering active product status and continued availability.

Key Parameters

Parameter	NDS8425 Value	Unit
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	7.4	A
On-Resistance (Rds On Max) @ 7.4A, 4.5V	22	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	1.5	V
Gate Charge (Qg) @ 4.5V	18	nC
Input Capacitance (Ciss) @ 15V	1098	pF
Power Dissipation (Max)	2.5	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-SOIC	Surface Mount
FET Type	N-Channel	—

Substitute Part Grouping Explanation

Substitution of the NDS8425 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain-to-Source Voltage (Vdss) must be equal to or greater than 20V
Continuous Drain Current (Id) must be equal to or greater than 7.4A at 25°C
On-Resistance (Rds On) must not exceed the application's thermal and efficiency constraints
Gate Threshold Voltage (Vgs(th)) must be compatible with the drive circuit
Operating temperature range must encompass -55°C to 150°C minimum

Mechanical Compatibility Requirements:

Package type must be 8-SOIC surface mount configuration
Package dimensions must match 0.154" width (3.90mm)
Mounting type must be surface mount

Regulatory and Compliance Requirements:

RoHS3 compliance required
Moisture Sensitivity Level (MSL) of 1 (Unlimited) preferred
Active or Not For New Designs product status acceptable; Obsolete status not acceptable for substitutes

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching or exceeding all primary electrical parameters within tight tolerances) and Functional Alternatives (meeting minimum electrical requirements with higher voltage or current ratings).

Parameter Comparison

Parameter	NDS8425	DMN2028USS-13	FDS4480	FDS4672A	AO4468	IRF7469TRPBF	IRF7470TRPBF	SI4114DY-T1-E3	Unit
Vdss	20	20	40	40	30	40	40	20	V
Id @ 25°C	7.4	7.3	10.8	11	10.5	9	10	20	A
Rds On (Max)	22	20	12	13	14	17	13	6	mOhm
Vgs(th) @ 250µA	1.5	1.3	5	2	3	3	2	2.1	V
Qg @ Vgs	18 @ 4.5V	11.6 @ 4.5V	41 @ 10V	49 @ 4.5V	24 @ 10V	23 @ 4.5V	44 @ 4.5V	95 @ 10V	nC
Ciss (Max)	1098 @ 15V	1000 @ 10V	1686 @ 20V	4766 @ 20V	1200 @ 15V	2000 @ 20V	3430 @ 20V	3700 @ 10V	pF
Power Dissipation (Max)	2.5	1.56	2.5	2.5	3.1	2.5	2.5	2.5 (Ta) / 5.7 (Tc)	W
Operating Temp Range	-55 to 150	-55 to 150	-55 to 175	-55 to 175	-55 to 150	-55 to 150	-55 to 150	-55 to 150	°C
Package	8-SOIC	8-SO	8-SOIC	8-SOIC	8-SOIC	8-SO	8-SO	8-SOIC	—
Manufacturer	onsemi	Diodes Inc.	onsemi	onsemi	Alpha & Omega	Infineon	International Rectifier	Vishay Siliconix	—
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Active	Active	Active	—

Engineering Selection Recommendations

Direct Electrical Equivalents (Recommended Primary Substitutes):

DMN2028USS-13 (Diodes Incorporated) is the closest direct equivalent to the NDS8425. It maintains identical 20V Vdss rating and 7.3A continuous drain current, with superior on-resistance of 20mOhm compared to the NDS8425's 22mOhm. Gate threshold voltage of 1.3V is compatible with low-voltage drive circuits. The device is Active product status with full RoHS3 compliance and MSL 1 rating. Lower power dissipation of 1.56W provides thermal margin. Operating temperature range matches the NDS8425 specification of -55°C to 150°C. Package is 8-SO, mechanically compatible with 8-SOIC footprint.

SI4114DY-T1-E3 (Vishay Siliconix) offers superior performance with identical 20V Vdss rating but significantly higher 20A continuous drain current. On-resistance of 6mOhm is substantially lower, providing reduced power dissipation and improved efficiency. Active product status with RoHS3 compliance. Operating temperature range of -55°C to 150°C matches specification. Gate threshold voltage of 2.1V is compatible with standard drive circuits. Higher gate charge of 95nC requires consideration in high-frequency switching applications. Package is 8-SOIC, providing direct mechanical compatibility.

Functional Alternatives (Higher Voltage Rating):

FDS4480 (onsemi) and FDS4672A (onsemi) both provide 40V Vdss rating with higher current capabilities (10.8A and 11A respectively), offering design margin for voltage transients. Both are Active product status with RoHS3 compliance and extended operating temperature to 175°C. On-resistance values of 12mOhm and 13mOhm respectively provide improved efficiency. These devices are suitable for applications where higher voltage headroom is required.

IRF7469TRPBF (Infineon) and IRF7470TRPBF (International Rectifier) provide 40V Vdss with 9A and 10A continuous drain current respectively. Both are Active product status with RoHS3 compliance. On-resistance values of 17mOhm and 13mOhm provide acceptable performance. Operating temperature range of -55°C to 150°C matches specification.

AO4468 (Alpha & Omega Semiconductor) provides 30V Vdss with 10.5A continuous drain current. Product status is Not For New Designs; this device is acceptable for replacement in existing designs but not recommended for new development. On-resistance of 14mOhm and power dissipation of 3.1W are acceptable for most applications.

Selection Criteria by Application:

Low-voltage drive circuits (Vgs < 2V): Select DMN2028USS-13 for lowest gate threshold voltage compatibility
High-efficiency applications: Select SI4114DY-T1-E3 for lowest on-resistance (6mOhm)
Voltage transient margin required: Select FDS4480 or FDS4672A for 40V rating
Existing design replacement: AO4468 acceptable if Not For New Designs status is permissible
onsemi ecosystem preference: FDS4480 or FDS4672A maintain manufacturer consistency

All recommended substitutes maintain 8-SOIC or compatible 8-SO package configuration, RoHS3 compliance, and MSL 1 rating. All active substitutes provide continued availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the NDS8425 be directly replaced with DMN2028USS-13?

A: Yes. The DMN2028USS-13 maintains identical 20V Vdss and 7.3A continuous drain current specifications. On-resistance of 20mOhm is superior to the NDS8425's 22mOhm. Gate threshold voltage of 1.3V is compatible with the NDS8425's 1.5V specification. Both devices operate across -55°C to 150°C. The DMN2028USS-13 is Active product status, providing long-term availability. Package compatibility is confirmed (8-SO/8-SOIC).

Q: What is the difference between 8-SOIC and 8-SO packaging?

A: Both designations refer to 8-pin small-outline integrated circuit packages with identical 0.154" (3.90mm) width and pin spacing. The terms are used interchangeably by different manufacturers. Footprint compatibility is confirmed for all listed substitutes.

Q: Why is SI4114DY-T1-E3 recommended despite higher gate charge?

A: The SI4114DY-T1-E3 provides 20A continuous drain current versus the NDS8425's 7.4A, with on-resistance of only 6mOhm versus 22mOhm. This results in significantly lower power dissipation and improved thermal performance. Gate charge of 95nC is higher but remains within acceptable limits for most switching applications. The higher current rating provides design margin for transient conditions. Selection depends on application requirements for current capacity and switching frequency.

Q: Are 40V-rated devices (FDS4480, FDS4672A) suitable replacements for 20V applications?

A: Yes. Higher voltage-rated devices are functionally compatible with 20V applications. The 40V rating provides margin for voltage transients and overshoot conditions. On-resistance values of 12mOhm and 13mOhm are superior to the NDS8425's 22mOhm, resulting in improved efficiency. These devices are recommended when design margin for voltage stress is required. No circuit modification is necessary.

Q: What is the significance of gate threshold voltage (Vgs(th)) in substitution?

A: Gate threshold voltage determines the minimum gate-source voltage required to turn the device on. The NDS8425 specifies 1.5V at 250µA. Substitute devices with lower Vgs(th) (such as DMN2028USS-13 at 1.3V) are compatible with lower-voltage drive circuits. Devices with higher Vgs(th) (such as FDS4480 at 5V) require higher drive voltage but provide better noise immunity. Compatibility depends on the drive circuit's output voltage capability.

Q: Why is AO4468 marked "Not For New Designs"?

A: The "Not For New Designs" status indicates the manufacturer has discontinued active development and recommends alternative devices for new applications. However, AO4468 remains available for replacement in existing designs. For new development, select Active-status alternatives such as SI4114DY-T1-E3, DMN2028USS-13, or FDS4480.

Q: How does on-resistance (Rds On) affect circuit performance?

A: On-resistance determines power dissipation and voltage drop across the device during conduction. Lower Rds On values reduce power loss and heat generation. The NDS8425 specifies 22mOhm maximum. Substitutes with lower Rds On (such as SI4114DY-T1-E3 at 6mOhm) improve efficiency and reduce thermal management requirements. Higher Rds On values (such as IRF7465TRPBF at 280mOhm) are acceptable only in low-current applications.

Q: What is the importance of RoHS3 compliance in substitution?

A: RoHS3 compliance certifies that the device meets European Union restrictions on hazardous substances, including lead, cadmium, and mercury. All recommended substitutes maintain RoHS3 compliance, ensuring regulatory compatibility and environmental compliance. This is mandatory for applications subject to EU regulations or customer requirements.

Q: Can devices with extended operating temperature range (to 175°C) be used in -55°C to 150°C applications?

A: Yes. Extended temperature range capability is a superset of the NDS8425's -55°C to 150°C specification. Devices such as FDS4480 and FDS4672A with -55°C to 175°C range are fully compatible and provide additional thermal margin. No circuit modification is required.

Q: What is gate charge (Qg) and why does it matter in substitution?

A: Gate charge represents the total charge required to switch the device from off to on state. The NDS8425 specifies 18nC at 4.5V. Higher gate charge (such as FDS4672A at 49nC) requires more drive current and increases switching losses in high-frequency applications. Lower gate charge (such as DMN2028USS-13 at 11.6nC) reduces drive requirements. Selection depends on switching frequency and drive circuit capability.

Q: Is inventory availability a factor in substitution selection?

A: Yes. The parameter comparison table includes current inventory levels. DMN2028USS-13 (25,300 pcs), FDS4480 (4,631 pcs), and SI4114DY-T1-E3 (55,300 pcs) offer strong availability. AO4468 (60,300 pcs) provides highest inventory but carries Not For New Designs status. Active-status devices with substantial inventory are preferred for long-term supply chain stability.

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