BZX84C20-7-F-79 Equivalent & Substitute Parts

Part Overview

The BZX84C20-7-F-79 is a 20 V, 300 mW Zener diode manufactured by Diodes Incorporated in SOT-23-3 surface mount packaging. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance across voltage regulation, power dissipation, and thermal operating ranges while meeting equivalent packaging and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	20	V
Tolerance	±6%	-
Power - Maximum	300	mW
Impedance (Maximum)	55	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 14 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84C20-7-F-79 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 20 V nominal
Power rating: 300 mW maximum
Impedance: 55 Ohms maximum
Reverse leakage current: 100 nA @ 14 V
Forward voltage: 900 mV maximum @ 10 mA
Operating temperature range: -65°C to 150°C
Package: SOT-23-3 (TO-236-3, SC-59)
Surface mount configuration

Secondary Substitution Criteria:

Tolerance: ±6% (±2% and ±5% variants acceptable for tighter regulation requirements)
Packaging format: Tape & Reel (TR) acceptable for production volumes
Compliance: ROHS3, REACH Unaffected, EAR99 classification

Substitute parts are grouped into two categories: direct equivalents (identical tolerance and packaging) and parametric equivalents (enhanced specifications or alternative packaging formats that maintain or exceed performance requirements).

Parameter Comparison

Part Number	Manufacturer	Product Status	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Packaging Format	Grade
BZX84C20-7-F-79	Diodes Incorporated	Obsolete	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	-	-
BZX84C20-7-F	Diodes Incorporated	Active	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Tape & Reel (TR)	-
BZX84B20Q-7-F	Diodes Incorporated	Active	20 V	±2%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Tape & Reel (TR)	Automotive
BZX84C20Q-13-F	Diodes Incorporated	Active	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Tape & Reel (TR)	Automotive
BZX84C20Q-7-F	Diodes Incorporated	Active	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Tape & Reel (TR)	Automotive
BZX84C20	Taiwan Semiconductor Corporation	Active	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	-	-
BZX84C20 RFG	Taiwan Semiconductor Corporation	Active	20 V	±5%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Tape & Reel (TR)	-

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

BZX84C20-7-F (Diodes Incorporated) is the direct active equivalent to the obsolete BZX84C20-7-F-79. This part maintains identical electrical specifications, operating temperature range, and package configuration. The primary distinction is product status (active versus obsolete) and packaging format (Tape & Reel). This part is suitable for immediate design migration with no circuit modifications required.

Parametric Equivalents with Enhanced Specifications:

BZX84B20Q-7-F and BZX84C20Q-7-F (Diodes Incorporated) are automotive-grade alternatives with AEC-Q101 qualification. BZX84B20Q-7-F provides tighter tolerance (±2% versus ±6%), beneficial for applications requiring enhanced voltage regulation precision. BZX84C20Q-13-F offers automotive qualification with standard ±6% tolerance. These parts are suitable for applications where automotive-grade reliability and qualification are required or beneficial.

Alternative Manufacturer Equivalent:

BZX84C20 and BZX84C20 RFG (Taiwan Semiconductor Corporation) provide functional equivalence with identical core electrical parameters. BZX84C20 RFG offers marginally tighter tolerance (±5% versus ±6%). These alternatives are suitable when supply chain diversification or cost optimization is a design consideration, provided no manufacturer-specific qualification requirements exist.

Selection Basis:

All substitute parts maintain compliance with ROHS3, REACH Unaffected, and EAR99 classification standards. Selection should prioritize active product status and established supply availability. Automotive-grade variants are appropriate for applications subject to automotive qualification requirements or operating in demanding thermal environments.

Frequently Asked Questions (FAQ)

Q: Can BZX84C20-7-F directly replace BZX84C20-7-F-79 without circuit modification?

A: Yes. BZX84C20-7-F is a direct equivalent with identical electrical specifications, operating temperature range, and SOT-23-3 package. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel). No circuit modifications are required.

Q: What is the difference between BZX84C20-7-F and BZX84B20Q-7-F?

A: Both parts share identical zener voltage (20 V), power rating (300 mW), impedance (55 Ω), and operating temperature range. The primary difference is tolerance: BZX84B20Q-7-F provides ±2% tolerance compared to ±6% for BZX84C20-7-F. BZX84B20Q-7-F also carries automotive-grade designation with AEC-Q101 qualification. Select BZX84B20Q-7-F for applications requiring tighter voltage regulation or automotive qualification.

Q: Are Taiwan Semiconductor Corporation parts (BZX84C20, BZX84C20 RFG) compatible substitutes?

A: Yes. Both Taiwan Semiconductor Corporation parts maintain identical zener voltage, power rating, impedance, reverse leakage current, forward voltage, and operating temperature range. BZX84C20 RFG offers ±5% tolerance versus ±6% for the original part. These alternatives are suitable when manufacturer diversification is acceptable and no manufacturer-specific qualification requirements exist.

Q: What does "Tape & Reel (TR)" packaging mean, and does it affect compatibility?

A: Tape & Reel is a production packaging format for automated assembly equipment. It does not affect electrical performance or physical compatibility. The underlying component remains in SOT-23-3 package. Tape & Reel format is standard for high-volume production; bulk or tube packaging may be available upon request from suppliers.

Q: Why are some substitute parts designated as "Automotive" grade?

A: Automotive-grade parts (BZX84B20Q-7-F, BZX84C20Q-7-F, BZX84C20Q-13-F) carry AEC-Q101 qualification, indicating compliance with automotive industry reliability and testing standards. These parts are suitable for automotive applications or environments requiring enhanced reliability assurance. Non-automotive applications may use standard-grade equivalents.

Q: Can I use BZX84C20 RFG (±5% tolerance) instead of the original ±6% part?

A: Yes. BZX84C20 RFG provides tighter tolerance (±5% versus ±6%), which is a performance enhancement. All other electrical parameters remain equivalent. This substitution is suitable for applications where improved voltage regulation precision is beneficial or neutral.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, consistent with the original BZX84C20-7-F-79 specification.

Q: What is the significance of the "Q" designation in part numbers like BZX84C20Q-7-F?

A: The "Q" designation indicates automotive-grade qualification with AEC-Q101 certification. This designation does not affect electrical performance but indicates enhanced reliability testing and qualification for automotive applications.

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