FDS4501H Equivalent & Substitute Parts

Part Overview

The FDS4501H is a dual-channel MOSFET array manufactured by onsemi, featuring integrated N-channel and P-channel MOSFETs in a compact 8-SOIC surface mount package. This device is rated for 30V and 20V drain-to-source voltage with continuous drain currents of 9.3A and 5.6A respectively, and incorporates logic-level gate drive capability suitable for low-voltage switching applications.

The FDS4501H carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Configuration	N and P-Channel	—
Drain to Source Voltage (Vdss)	30V, 20V	V
Continuous Drain Current (Id) @ 25°C	9.3A, 5.6A	A
RDS(on) Max @ Id, Vgs	18mOhm @ 9.3A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) Max @ Id	3V @ 250µA	V
Gate Charge (Qg) Max @ Vgs	27nC @ 4.5V	nC
Input Capacitance (Ciss) Max @ Vds	1958pF @ 10V	pF
Power Dissipation Max	1W	W
Operating Temperature Range	-55°C to 150°C	°C
Package Type	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FDS4501H are identified based on strict alignment with the following critical parameters:

Configuration Match: Both the main part and substitute must feature N-channel and P-channel MOSFET configuration in a single package.

Voltage Rating Compatibility: The substitute must support the 30V drain-to-source voltage specification of the primary N-channel device.

Current Capability: The substitute must provide continuous drain current ratings that meet or exceed the application requirements. The FDS4501H N-channel device delivers 9.3A; substitute devices must support equivalent or higher current capacity.

Package Compatibility: The substitute must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB layout compatibility without redesign.

Gate Drive Characteristics: Logic-level gate drive capability must be maintained to ensure compatibility with existing control circuitry.

Regulatory Compliance: The substitute must maintain ROHS3 compliance and REACH unaffected status to satisfy supply chain and environmental requirements.

The AO4616 from Alpha & Omega Semiconductor Inc. satisfies all substitution criteria within these defined parameters.

Parameter Comparison

Parameter	FDS4501H (onsemi)	AO4616 (Alpha & Omega)	Unit
Configuration	N and P-Channel	N and P-Channel	—
Drain to Source Voltage (Vdss)	30V, 20V	30V	V
Continuous Drain Current (Id) @ 25°C	9.3A, 5.6A	8A, 7A	A
RDS(on) Max @ Id, Vgs	18mOhm @ 9.3A, 10V	20mOhm @ 8A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) Max @ Id	3V @ 250µA	2.4V @ 250µA	V
Gate Charge (Qg) Max @ Vgs	27nC @ 4.5V	18nC @ 10V	nC
Input Capacitance (Ciss) Max @ Vds	1958pF @ 10V	888pF @ 15V	pF
Power Dissipation Max	1W	2W	W
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	°C
Package Type	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

Primary Substitute: AO4616

The AO4616 is the qualified substitute for the FDS4501H based on the following engineering criteria:

Regulatory and Compliance Alignment: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with current supply chain and environmental regulations. The AO4616 carries active product status, providing assured long-term availability and manufacturing support.

Package and Mounting Compatibility: Identical 8-SOIC package geometry (0.154", 3.90mm width) and surface mount configuration enable direct PCB layout compatibility without design modification.

Electrical Parameter Compatibility: The AO4616 supports the required 30V drain-to-source voltage rating. Continuous drain current ratings of 8A (N-channel) and 7A (P-channel) provide adequate current capacity for applications designed around the FDS4501H specifications. The AO4616 features lower gate threshold voltage (2.4V versus 3V) and reduced gate charge (18nC versus 27nC), resulting in improved gate drive efficiency and faster switching response.

Thermal Performance: The AO4616 provides 2W maximum power dissipation compared to 1W for the FDS4501H, offering enhanced thermal headroom in power-limited applications. Both devices operate across the identical temperature range of -55°C to 150°C.

Moisture Sensitivity: Both devices carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

The transition from FDS4501H to AO4616 requires no circuit redesign and presents no compatibility issues within the defined electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can the AO4616 be used as a direct replacement for the FDS4501H without PCB modifications?

A: Yes. Both devices use identical 8-SOIC package geometry with 0.154" (3.90mm) width. Pin-to-pin compatibility and surface mount footprint are identical, eliminating the need for PCB layout changes.

Q: What are the key electrical differences between the FDS4501H and AO4616?

A: The AO4616 features lower gate threshold voltage (2.4V versus 3V), reduced gate charge (18nC versus 27nC), and lower input capacitance (888pF versus 1958pF). These characteristics result in faster switching performance and reduced gate drive power requirements. Continuous drain current ratings are slightly lower (8A/7A versus 9.3A/5.6A), and maximum power dissipation is higher (2W versus 1W).

Q: Are there any thermal considerations when substituting the AO4616 for the FDS4501H?

A: The AO4616 provides higher maximum power dissipation (2W versus 1W), which improves thermal performance in applications operating near power limits. Both devices operate across the same temperature range (-55°C to 150°C). Thermal management design should account for the specific application current and duty cycle requirements.

Q: Do both devices meet the same regulatory and compliance standards?

A: Yes. Both the FDS4501H and AO4616 are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Regulatory and environmental compliance requirements are identical.

Q: What is the primary advantage of transitioning to the AO4616?

A: The AO4616 carries active product status with assured long-term availability, whereas the FDS4501H is obsolete. The AO4616 also provides improved switching characteristics through lower gate charge and threshold voltage, along with enhanced thermal performance through higher power dissipation rating.

Q: Are there any gate drive circuit modifications required when using the AO4616?

A: No modifications are required. Both devices feature logic-level gate drive capability and operate with identical gate threshold voltage ranges. The lower gate charge of the AO4616 (18nC versus 27nC) may reduce gate drive power consumption but does not require circuit changes.

Q: How do the current ratings compare between the two devices?

A: The FDS4501H provides 9.3A (N-channel) and 5.6A (P-channel) continuous drain current. The AO4616 provides 8A (N-channel) and 7A (P-channel). Applications operating below these current levels experience no performance impact. Applications requiring the full 9.3A N-channel current must verify that 8A capacity is sufficient for the specific use case.

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