Description

This Bipolar Junction Transistor (BJT) is designed to meet the stringent requirements of automotive applications.

Feature(s)

BV_CEO > 40V
I_C = 1A high Continuous Current
Low saturation voltage V_CE(sat)< 500mV @ 1A
Complementary PNP type: FCX591AQ
Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
The FCX491AQ is suitable for automotive applications requiring specific change control; this part is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Application(s)

Power MOSFET gate driving
Low loss power switching

Specifications & Technical Documents

Product Parameters

Compliance (Only Automotive Supports PPAP)	Automotive
Category	Medium Power Transistor
Polarity	NPN
RCE(sat) (mΩ)	-
VCEO, VCES (V)	40
IC (A)	1
ICM (A)	2
PD (W)	1
hFE (Min)	300
hFE (@ IC) (A)	0.5
h_FE(Min 2)	200
hFE (@ IC2) (A)	1
VCE(sat) Max (mV)	300
V_CE(SAT) (@ IC/IB) (A/mA)	0.5/50
VCE(sat) (Max.2) (mV)	500
VCE(sat) (@ IC/IB2) (A/mA)	1/100
fT (MHz)	150

Technical Documents

SPICE Model

FCX491AQ.spice.txt

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

RoHSFile

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2639	2023-09-26	2023-12-26	Qualification of Internal "Diodes Technology (Cheng Du) Company Limited" (CAT) as Additional Assembly & Test Site Using PdCu Bond Wire with Standardization of Assembly Bill of Materials at CAT for Select Automotive Products

FCX491AQ