AO3416 N-Channel MOSFET 20V 6.5A SOT-23-3 Equivalent & Substitute Parts

Part Overview

The AO3416 is an N-Channel metal oxide semiconductor field-effect transistor (MOSFET) manufactured by Alpha & Omega Semiconductor Inc., rated for 20V drain-to-source voltage and 6.5A continuous drain current in a surface mount SOT-23-3 package. This device is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product portfolio. Identifying equivalent and substitute parts is necessary for ongoing production support, legacy system maintenance, and design flexibility when the primary part becomes unavailable or when alternative suppliers are required for supply chain optimization.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	6.5	A
On-Resistance (Rds On) @ 6.5A, 4.5V	22	mOhm
Gate-Source Voltage (Vgs) Maximum	±8	V
Gate Threshold Voltage (Vgs(th)) @ 250µA	1	V
Power Dissipation (Max)	1.4	W
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AO3416 is determined by strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id): Must equal or exceed 6.5A at 25°C
Package Type: Must be SOT-23-3 or mechanically equivalent variant (TO-236-3, SC-59)
Mounting Type: Surface mount only
Operating Temperature Range: Must span -55°C to 150°C minimum
On-Resistance (Rds On): Lower values indicate improved performance; values at or below 22mOhm @ 4.5V are preferred

Secondary Compatibility Parameters:

Gate-Source Voltage (Vgs) Rating: ±8V minimum required; higher ratings (±10V, ±12V) provide additional margin
Gate Threshold Voltage (Vgs(th)): Typically 0.9V to 1.25V; variations within this range are acceptable
Power Dissipation: 1.3W to 1.4W range maintains thermal equivalence
Regulatory Compliance: RoHS3 compliance and REACH unaffected status required

Substitute parts are grouped into two categories:

Category A – Direct Electrical Equivalents (6.5A Rating): Parts meeting or exceeding the full 6.5A continuous drain current specification with matching voltage and package requirements.

Category B – Functional Alternatives (Lower Current Rating): Parts with reduced continuous drain current (3.6A to 4A) that maintain voltage and package compatibility but require application-level current derating analysis.

Parameter Comparison

Parameter	AO3416	AOSS32136C	DMG6968U-7	NTR3C21NZT3G	PMV16XNR	PMV20XNEAR	RUR020N02TL	RUR040N02TL
Manufacturer	Alpha & Omega	Alpha & Omega	Diodes Inc.	onsemi	Nexperia	Nexperia	Rohm	Rohm
Vdss (V)	20	20	20	20	20	20	20	20
Id @ 25°C (A)	6.5	6.5	6.5	3.6	6.8	6.3	2	4
Rds On @ 4.5V (mOhm)	22	20	25	24	20	20	105	35
Vgs(th) @ 250µA (V)	1	1.25	0.9	1	0.9	1.25	1	1.3
Vgs Max (V)	±8	±12	±12	±8	±12	±12	±10	±10
Qg @ 4.5V (nC)	16	14	8.5	17.8	20.2	15	2	8
Ciss @ 10V (pF)	1160	660	151	1540	1240	930	180	680
Power Dissipation (W)	1.4	1.3	1.3	0.47	0.51	0.46	0.54	1
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	TO-236AB	TO-236AB	TSMT3	TSMT3
Product Status	Not For New Designs	Active	Not For New Designs	Active	Active	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Primary Substitutes (Category A – Full Current Rating Equivalents):

AOSS32136C (Alpha & Omega Semiconductor Inc.) – Recommended for direct replacement in new production and legacy support. This part maintains the 6.5A continuous drain current specification with improved on-resistance (20mOhm vs. 22mOhm) and reduced gate charge (14nC vs. 16nC), resulting in lower switching losses. Product status is Active, ensuring long-term availability. Vgs rating increased to ±12V provides additional gate drive margin. Inventory availability is limited (4,400 pcs).

PMV16XNR (Nexperia USA Inc.) – Suitable substitute with 6.8A continuous drain current rating, exceeding the AO3416 specification. On-resistance of 20mOhm matches AOSS32136C performance. Active product status ensures supply continuity. Package designation is TO-236AB, mechanically equivalent to SOT-23-3. High inventory availability (800,100 pcs) supports volume production. Vgs rating of ±12V provides enhanced gate drive flexibility.

PMV20XNEAR (Nexperia USA Inc.) – Qualified automotive-grade substitute (AEC-Q101) with 6.3A continuous drain current. On-resistance of 20mOhm and gate charge of 15nC provide performance comparable to AO3416. Active product status with automotive qualification supports mission-critical applications. Limited inventory (1,049 pcs) requires advance planning. Vgs rating of ±12V exceeds AO3416 specification.

Secondary Substitutes (Category B – Reduced Current Rating):

NTR3C21NZT3G (onsemi) – Functional alternative with reduced 3.6A continuous drain current rating. Suitable only for applications where load current does not exceed 3.6A. Active product status and high inventory (25,399 pcs) support availability. On-resistance of 24mOhm and gate charge of 17.8nC are within acceptable range. Vgs rating of ±8V matches AO3416. Tape & Reel packaging available.

RUR040N02TL (Rohm Semiconductor) – Functional alternative with 4A continuous drain current rating. Suitable for applications with maximum load current of 4A. Active product status ensures supply. On-resistance of 35mOhm is higher than AO3416, resulting in increased power dissipation. TSMT3 package (SC-96) differs from SOT-23-3, requiring PCB layout modification. Vgs rating of ±10V provides adequate margin.

Not Recommended:

DMG6968U-7 (Diodes Incorporated) – Although rated for 6.5A, product status is "Not For New Designs," limiting long-term availability and support. On-resistance of 25mOhm is higher than AO3416, resulting in increased power dissipation and thermal stress.

RUR020N02TL (Rohm Semiconductor) – Continuous drain current of 2A is insufficient for most applications requiring 6.5A capability. On-resistance of 105mOhm results in excessive power dissipation. TSMT3 package requires PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can AOSS32136C be used as a direct replacement for AO3416 without circuit modification?

A: Yes. AOSS32136C meets or exceeds all critical electrical parameters: 20V Vdss, 6.5A Id, SOT-23-3 package, and -55°C to 150°C operating range. Improved performance characteristics (lower Rds On and Qg) are beneficial. No circuit modification is required. Verify gate drive voltage does not exceed ±12V maximum rating.

Q: What is the difference between SOT-23-3 and TO-236AB packages?

A: SOT-23-3 and TO-236AB are mechanically and electrically equivalent surface mount packages with identical pin configurations and thermal characteristics. Both designations refer to the same 3-lead small-outline transistor package. Parts specified as TO-236AB are direct substitutes for SOT-23-3 applications without PCB modification.

Q: Why do some substitute parts have lower continuous drain current ratings?

A: NTR3C21NZT3G (3.6A) and RUR040N02TL (4A) are included as functional alternatives for applications where load current does not exceed their rated values. These parts maintain voltage and package compatibility but require application-level current derating analysis. Use only if maximum circuit current is confirmed below the substitute part's Id rating.

Q: Is PMV20XNEAR suitable for automotive applications?

A: Yes. PMV20XNEAR carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. This qualification is not present on other substitutes. If automotive qualification is required, PMV20XNEAR is the appropriate selection.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates the manufacturer has discontinued active development and recommends alternative parts for new circuit designs. The part remains available for legacy system support and ongoing production of existing designs. For new designs, select parts with "Active" product status such as AOSS32136C, PMV16XNR, or PMV20XNEAR.

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

A: On-resistance determines power dissipation in the conducting state: P = I²R. Lower Rds On values reduce heat generation and improve efficiency. AOSS32136C and PMV16XNR (20mOhm) dissipate less power than AO3416 (22mOhm). RUR040N02TL (35mOhm) and RUR020N02TL (105mOhm) generate significantly higher dissipation and are suitable only for low-current applications.

Q: Can gate charge (Qg) differences affect switching speed?

A: Yes. Gate charge determines the time required to switch the transistor on or off. Lower Qg values enable faster switching and reduced switching losses. AOSS32136C (14nC) and DMG6968U-7 (8.5nC) switch faster than AO3416 (16nC). In high-frequency applications, faster switching reduces overall power dissipation.

Q: What inventory considerations apply to substitute selection?

A: PMV16XNR has the highest inventory (800,100 pcs), supporting large-volume production without supply constraints. AOSS32136C (4,400 pcs) and PMV20XNEAR (1,049 pcs) have limited inventory and require advance ordering for volume requirements. NTR3C21NZT3G (25,399 pcs) and RUR040N02TL (16,168 pcs) provide moderate availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements equivalent to AO3416.

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