How do the Vishay Vishay SI44 Series variants differ?

Vishay SI44 Series part numbers differ by current - continuous drain (Id) @ 25°C, drain to source voltage, drive voltage (Max rds on, min rds on) and FET type. Use the selection guide above to pick by current - continuous drain (Id) @ 25°C.

How many Vishay Vishay SI44 Series part numbers are listed?

5 Vishay Vishay SI44 Series part numbers are listed, each with specifications and a datasheet where available.

Vishay SI44 Series

5 variants · Vishay

About the Vishay Vishay SI44 Series series

The Vishay Vishay SI44 Series series groups 5 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. Every variant in the range shares a common case of 8-SOIC (0.154\", 3.90mm Width), FET feature of - and mounting type of Surface Mount. Variants differ by current - continuous drain (Id) @ 25°C, drain to source voltage and drive voltage (Max rds on, min rds on), so you can match the exact current - continuous drain (Id) @ 25°C your application requires using the selection guide below. All listed Vishay SI44 Series part numbers are active and orderable.

Select a variant by

Current - continuous drain (Id) @ 25°C: 1.7A (Ta) · 2.8A (Ta), 4.1A (Tc) · 12.7A (Ta), 18.3A (Tc) · 14A (Ta) · 15.4A (Tc)
Drain to source voltage: 20 V · 30 V · 200 V · 250 V
Drive voltage (Max rds on, min rds on): 1.8V, 4.5V · 4.5V, 10V · 6V, 10V · 7.5V, 10V
FET type: N-Channel · P-Channel
Gate charge (Qg) (Max) @ vgs: 16.5 nC @ 10 V · 18 nC @ 10 V · 32 nC @ 4.5 V · 41 nC @ 10 V · 99 nC @ 8 V
Power dissipation: 1.5W (Ta) · 1.6W (Ta) · 2.3W (Ta), 4.8W (Tc) · 2.9W (Ta), 6W (Tc) · 5W (Tc)
Rds on (Max) @ id, vgs: 4.5mOhm @ 21A, 10V · 9.5mOhm @ 10A, 10V · 14mOhm @ 9A, 4.5V · 150mOhm @ 2.8A, 10V · 240mOhm @ 2.2A, 10V

Variant comparison

Parameter	SI4403DDY-T1-GE3	SI4408DY-T1-E3	SI4425FDY-T1-GE3	SI4434ADY-T1-GE3	SI4464DY-T1-E3
Current - continuous drain (Id) @ 25°C	15.4A (Tc)	14A (Ta)	12.7A (Ta), 18.3A (Tc)	2.8A (Ta), 4.1A (Tc)	1.7A (Ta)
Drain to source voltage	20 V	20 V	30 V	250 V	200 V
Drive voltage (Max rds on, min rds on)	1.8V, 4.5V	4.5V, 10V	4.5V, 10V	7.5V, 10V	6V, 10V
FET type	P-Channel	N-Channel	P-Channel	N-Channel	N-Channel
Gate charge (Qg) (Max) @ vgs	99 nC @ 8 V	32 nC @ 4.5 V	41 nC @ 10 V	16.5 nC @ 10 V	18 nC @ 10 V
Power dissipation	5W (Tc)	1.6W (Ta)	2.3W (Ta), 4.8W (Tc)	2.9W (Ta), 6W (Tc)	1.5W (Ta)
Rds on (Max) @ id, vgs	14mOhm @ 9A, 4.5V	4.5mOhm @ 21A, 10V	9.5mOhm @ 10A, 10V	150mOhm @ 2.8A, 10V	240mOhm @ 2.2A, 10V

Shared specifications

Case: 8-SOIC (0.154\", 3.90mm Width)
FET feature: -
Mounting type: Surface Mount
Operating temperature: -55°C ~ 150°C (TJ)
Package: Tape & Reel (TR) Cut Tape (CT)
Technology: MOSFET (Metal Oxide)

Request a quote on any Vishay SI44 Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.

Frequently asked questions

How do the Vishay Vishay SI44 Series variants differ?: Vishay SI44 Series part numbers differ by current - continuous drain (Id) @ 25°C, drain to source voltage, drive voltage (Max rds on, min rds on) and FET type. Use the selection guide above to pick by current - continuous drain (Id) @ 25°C.
How many Vishay Vishay SI44 Series part numbers are listed?: 5 Vishay Vishay SI44 Series part numbers are listed, each with specifications and a datasheet where available.
How do I get pricing and lead time for Vishay Vishay SI44 Series?: Request a quote (RFQ) for any Vishay SI44 Series part number and we confirm price, availability and lead time per line — including end-of-life and hard-to-find variants.