FDS4435A P-Channel MOSFET 30V 9A Equivalent & Substitute Parts

Part Overview

The FDS4435A is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by onsemi, rated for 30V drain-to-source voltage and 9A continuous drain current in a surface mount 8-SOIC package. This device is part of the PowerTrench® series and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating the same or compatible package footprints.

Key Parameters

Parameter	FDS4435A Value	Unit
FET Type	P-Channel	-
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain (Id) @ 25°C	9	A (Ta)
Rds On (Max) @ Id, Vgs	17	mOhm @ 9A, 10V
Vgs(th) (Max) @ Id	2	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	30	nC @ 5V
Vgs (Max)	±20	V
Input Capacitance (Ciss) (Max) @ Vds	2010	pF @ 15V
Power Dissipation (Max)	2.5	W (Ta)
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	8-SOIC (0.154", 3.90mm Width)	-
Product Status	Obsolete	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the FDS4435A is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

FET Type: P-Channel (mandatory)
Drain to Source Voltage (Vdss): 30V (exact match required)
Current - Continuous Drain (Id): Minimum 9A at 25°C (equal or greater acceptable)
Rds On (Max) @ 10V: 17mOhm or lower (lower values acceptable)
Operating Temperature Range: -55°C to 150°C (TJ) minimum
Mounting Type: Surface Mount (mandatory)
Package Compatibility: 8-SOIC or 8-SOP footprint (0.154", 3.90mm Width)
RoHS3 Compliance: Required
MSL Rating: 1 (Unlimited) preferred

Secondary Compatibility Parameters:

Vgs(th) (Max) @ 250µA: 2V to 3V range acceptable
Vgs (Max): ±20V to ±25V acceptable
Gate Charge (Qg): 16.5nC to 65nC acceptable
Input Capacitance (Ciss): 1180pF to 4000pF acceptable
Power Dissipation: 1.4W (Ta) minimum to 5.6W (Tc) maximum acceptable

Substitute parts must satisfy all primary criteria and maintain compatibility within secondary parameter ranges to ensure functional equivalence in circuit applications.

Parameter Comparison

Parameter	FDS4435A	FDS4435BZ	AOSP21321	DMP3036SSS-13	RS3E075ATTB	SI4835DDY-T1-E3	RSS090P03TB
Manufacturer	onsemi	onsemi	Alpha & Omega	Diodes Inc.	Rohm	Vishay	Rohm
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss (V)	30	30	30	30	30	30	30
Id @ 25°C (A)	9	8.8	11	19.5	-	13	9
Rds On (Max) @ 10V (mOhm)	17 @ 9A	20 @ 8.8A	17 @ 11A	20 @ 9A	23.5 @ 7.5A	18 @ 10A	14 @ 9A
Vgs(th) (Max) @ 250µA (V)	2	3	2.3	3	2.5	3	2.5
Vgs (Max) (V)	±20	±25	±25	±25	±20	±25	±20
Gate Charge (Qg) @ Vgs (nC)	30 @ 5V	40 @ 10V	34 @ 10V	16.5 @ 10V	25 @ 10V	65 @ 10V	39 @ 5V
Ciss (Max) @ 15V (pF)	2010	1845	1180	1931	1250	1960	4000
Power Dissipation (Max) (W)	2.5 (Ta)	2.5 (Ta)	3.1 (Ta)	1.4 (Ta)	2 (Ta)	2.5 (Ta) / 5.6 (Tc)	2 (Ta)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	to 150	-55 to 150	to 150
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SO	8-SOP-J	8-SOIC	8-SOP
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Highest Compatibility):

FDS4435BZ (onsemi) and RSS090P03TB (Rohm) are the primary substitutes for the FDS4435A. Both devices maintain the same 30V Vdss rating, 9A continuous drain current specification, and identical operating temperature range (-55°C to 150°C). FDS4435BZ is an active product from the same manufacturer (onsemi) with nearly identical electrical characteristics and the same 8-SOIC package footprint. RSS090P03TB offers superior on-resistance performance (14mOhm vs. 17mOhm) while maintaining 9A current capacity and compatible 8-SOP package dimensions. Both are ROHS3 compliant with MSL 1 rating.

Tier 2 - Functional Equivalents (Acceptable Substitutes):

AOSP21321 (Alpha & Omega Semiconductor) and SI4835DDY-T1-E3 (Vishay Siliconix) provide functional equivalence with enhanced current capacity. AOSP21321 delivers 11A continuous drain current with 17mOhm on-resistance, matching the FDS4435A's Rds On specification while providing 22% additional current margin. SI4835DDY-T1-E3 provides 13A continuous drain current with 18mOhm on-resistance and enhanced thermal performance (5.6W at Tc). Both maintain 30V Vdss rating, compatible operating temperature range, and 8-SOIC package footprint. Both are active products with ROHS3 compliance.

Tier 3 - Alternative Substitutes (Limited Compatibility):

DMP3036SSS-13 (Diodes Incorporated) offers the highest current capacity at 19.5A with 20mOhm on-resistance, suitable for applications requiring significant current margin. However, power dissipation is reduced to 1.4W (Ta), which may limit thermal performance in high-power applications. RS3E075ATTB (Rohm Semiconductor) is classified as "Not For New Designs" and should be avoided for new circuit implementations, though it maintains 30V Vdss and compatible package dimensions.

Product Status Considerations:

The FDS4435A is obsolete. FDS4435BZ, AOSP21321, SI4835DDY-T1-E3, and RSS090P03TB are all active products suitable for new designs. RS3E075ATTB carries "Not For New Designs" status and is appropriate only for legacy system maintenance or replacement applications.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes. All devices carry EAR99 ECCN classification and REACH Unaffected status, matching the original FDS4435A regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can FDS4435BZ directly replace FDS4435A in existing designs?

A: Yes. FDS4435BZ is a direct substitute from the same manufacturer (onsemi) with identical 30V Vdss rating, 9A continuous drain current, and 8-SOIC package footprint. Electrical characteristics are nearly identical, with FDS4435BZ showing slightly higher on-resistance (20mOhm vs. 17mOhm at rated current). Both are ROHS3 compliant with MSL 1 rating. FDS4435BZ is an active product, whereas FDS4435A is obsolete.

Q: What is the primary difference between Tier 1 and Tier 2 substitutes?

A: Tier 1 substitutes (FDS4435BZ and RSS090P03TB) maintain the exact 9A continuous drain current specification of the FDS4435A. Tier 2 substitutes (AOSP21321 and SI4835DDY-T1-E3) provide higher current capacity (11A and 13A respectively), offering additional design margin but requiring verification that the application circuit can accommodate the increased current rating without adverse effects.

Q: Are package footprints interchangeable between 8-SOIC and 8-SOP variants?

A: 8-SOIC and 8-SOP packages share the same 0.154" (3.90mm) width specification and are mechanically compatible on standard PCB layouts. However, pin pitch and body dimensions may vary slightly between manufacturers. Verify specific package drawings from the device datasheet before PCB layout finalization. RSS090P03TB (8-SOP) and DMP3036SSS-13 (8-SO) are compatible with FDS4435A (8-SOIC) footprints within standard manufacturing tolerances.

Q: Why is RS3E075ATTB marked "Not For New Designs"?

A: RS3E075ATTB carries "Not For New Designs" status from Rohm Semiconductor, indicating the manufacturer has discontinued active development and support for this device. While it maintains electrical compatibility with the FDS4435A (30V Vdss, compatible package), it should be used only for legacy system maintenance or replacement applications. New circuit designs should utilize active products such as FDS4435BZ, AOSP21321, SI4835DDY-T1-E3, or RSS090P03TB.

Q: What on-resistance performance should be expected from substitute parts?

A: The FDS4435A specifies 17mOhm maximum on-resistance at 9A and 10V gate-source voltage. Substitute parts range from 14mOhm (RSS090P03TB) to 23.5mOhm (RS3E075ATTB). Lower on-resistance values reduce power dissipation and heat generation, improving thermal performance. RSS090P03TB offers superior on-resistance performance at 14mOhm, while AOSP21321 and SI4835DDY-T1-E3 match the original 17mOhm specification.

Q: Are all substitute parts suitable for high-temperature applications?

A: All recommended substitutes maintain the -55°C to 150°C operating temperature range of the FDS4435A, with the exception of RS3E075ATTB and RSS090P03TB, which specify operation to 150°C without explicit lower temperature limit documentation. For applications requiring full -55°C to 150°C range, FDS4435BZ, AOSP21321, and SI4835DDY-T1-E3 are preferred. Verify specific temperature requirements against application specifications before final part selection.

Q: How does gate charge affect switching performance in substitute selection?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The FDS4435A specifies 30nC at 5V. Substitute parts range from 16.5nC (DMP3036SSS-13) to 65nC (SI4835DDY-T1-E3). Lower gate charge enables faster switching and reduced driver power consumption. DMP3036SSS-13 offers the lowest gate charge, while SI4835DDY-T1-E3 requires higher driver capability. Verify gate driver specifications against substitute part requirements to ensure adequate drive current and switching frequency compatibility.

Q: What inventory considerations apply to substitute part selection?

A: FDS4435BZ offers the highest inventory availability (68,168 pieces), followed by RSS090P03TB (120,200 pieces). AOSP21321 provides 36,200 pieces, SI4835DDY-T1-E3 provides 10,200 pieces, and DMP3036SSS-13 provides limited inventory (1,327 pieces). For applications requiring immediate availability or long-term supply assurance, FDS4435BZ and RSS090P03TB are preferred. DMP3036SSS-13 should be evaluated for applications where inventory constraints may impact production schedules.

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