BZX84C39 Equivalent & Substitute Parts

Part Overview

The BZX84C39 is an active-status zener diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the SOT-23 package. This component provides 39 V nominal zener voltage regulation at 300 mW maximum power dissipation. The part is RoHS3 compliant and REACH unaffected, suitable for general-purpose voltage regulation and protection circuits. Substitute parts are identified to address packaging preferences, tolerance requirements, automotive qualification needs, and inventory availability across multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Power - Maximum	300	mW
Tolerance	±5.13%	%
Impedance (Maximum)	130	Ohms
Current - Reverse Leakage @ 27.3 V	100	nA
Voltage - Forward (Maximum) @ 10 mA	900	mV
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84C39 is determined by the following critical parameters: nominal zener voltage (39 V), maximum power rating (300 mW), maximum impedance (130 Ohms), reverse leakage current (100 nA @ 27.3 V), forward voltage (900 mV @ 10 mA), operating temperature range (-65°C to 150°C), and surface mount SOT-23 package configuration.

Substitute parts are grouped into the following categories:

Packaging Variant (Tape & Reel): BZX84C39 RFG maintains identical electrical specifications with tape and reel packaging, differing only in tolerance (±5% versus ±5.13%) and moisture sensitivity level classification.

Tighter Tolerance Automotive Grade: BZX84B39Q-7-F and BZX84C39Q-7-F both feature AEC-Q101 automotive qualification and are supplied by Diodes Incorporated. BZX84B39Q-7-F offers ±2% tolerance (tighter than the main part), while BZX84C39Q-7-F matches the ±5.13% tolerance specification. Both are supplied in tape and reel packaging with SOT-23-3 package designation.

All substitute parts maintain electrical equivalence across zener voltage, power dissipation, impedance, leakage current, forward voltage, and operating temperature specifications. Package and case designations are identical or functionally equivalent.

Parameter Comparison

Parameter	BZX84C39	BZX84C39 RFG	BZX84B39Q-7-F	BZX84C39Q-7-F
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Diodes Incorporated	Diodes Incorporated
Voltage - Zener (Nominal)	39 V	39 V	39 V	39 V
Power - Maximum	300 mW	300 mW	300 mW	300 mW
Tolerance	±5.13%	±5%	±2%	±5.13%
Impedance (Maximum)	130 Ohms	130 Ohms	130 Ohms	130 Ohms
Current - Reverse Leakage @ 27.3 V	100 nA	100 nA	100 nA	100 nA
Voltage - Forward (Maximum) @ 10 mA	900 mV	900 mV	900 mV	900 mV
Operating Temperature Range	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Packaging Format	Tube	Tape & Reel	Tape & Reel	Tape & Reel
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

BZX84C39 RFG is selected when tape and reel packaging is required for automated assembly processes. This variant maintains all electrical specifications of the main part with marginally improved tolerance (±5% versus ±5.13%) and is suitable for high-volume production environments.

BZX84B39Q-7-F is selected for applications requiring tighter voltage tolerance (±2%) and automotive-grade qualification per AEC-Q101. This part is appropriate for automotive and mission-critical voltage regulation circuits where tolerance precision is a design requirement.

BZX84C39Q-7-F is selected for automotive applications requiring AEC-Q101 qualification while maintaining the standard ±5.13% tolerance specification. This part provides automotive-grade reliability without the cost premium of tighter tolerance variants.

All substitute parts are active-status components with full RoHS3 compliance and REACH unaffected status, matching the regulatory compliance profile of the main part. Selection between substitutes depends on packaging format preference, tolerance requirements, and automotive qualification necessity.

Frequently Asked Questions (FAQ)

Q: Can BZX84C39 RFG be used as a direct replacement for BZX84C39?

A: Yes. BZX84C39 RFG is electrically equivalent across all critical parameters: 39 V nominal zener voltage, 300 mW power rating, 130 Ohms maximum impedance, 100 nA reverse leakage, and 900 mV forward voltage. The primary difference is packaging format (tape and reel versus tube) and tolerance specification (±5% versus ±5.13%). Both are RoHS3 compliant and active-status products.

Q: What is the difference between BZX84B39Q-7-F and BZX84C39Q-7-F?

A: Both parts are manufactured by Diodes Incorporated and feature AEC-Q101 automotive qualification in SOT-23-3 packaging. The primary difference is tolerance: BZX84B39Q-7-F specifies ±2% tolerance, while BZX84C39Q-7-F specifies ±5.13% tolerance. All other electrical parameters are identical. Selection depends on whether tighter voltage tolerance is required for the application.

Q: Are all substitute parts suitable for automotive applications?

A: BZX84B39Q-7-F and BZX84C39Q-7-F carry AEC-Q101 automotive qualification. BZX84C39 and BZX84C39 RFG do not carry automotive qualification. For automotive applications, BZX84B39Q-7-F or BZX84C39Q-7-F must be specified.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (tube versus tape and reel) does not affect electrical performance. BZX84C39 RFG in tape and reel format is electrically identical to BZX84C39 in tube format. Packaging selection is based on assembly process requirements and inventory management.

Q: Are all parts RoHS3 compliant?

A: Yes. BZX84C39, BZX84C39 RFG, BZX84B39Q-7-F, and BZX84C39Q-7-F are all RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the ±2% tolerance in BZX84B39Q-7-F?

A: The ±2% tolerance specification indicates tighter voltage regulation accuracy compared to the ±5.13% tolerance of the main part. This tighter tolerance is beneficial in precision voltage regulation circuits where zener voltage accuracy directly impacts circuit performance. The ±2% specification is a subset of the ±5.13% specification, making BZX84B39Q-7-F suitable for applications requiring higher voltage accuracy.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided that the design does not require automotive qualification. All four parts maintain identical electrical specifications for zener voltage, power dissipation, impedance, leakage current, forward voltage, and operating temperature. Designs requiring automotive qualification must specify BZX84B39Q-7-F or BZX84C39Q-7-F. Packaging format changes (tube to tape and reel) require verification of assembly equipment compatibility.

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