BZX84C20-7 Equivalent & Substitute Parts

Part Overview

The BZX84C20-7 is a surface mount Zener diode rated at 20 V nominal with 300 mW power dissipation, manufactured by Diodes Incorporated in SOT-23-3 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for 20 V Zener diode applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the BZX84C20-7 is determined by the following critical parameters: nominal Zener voltage of 20 V, surface mount package compatibility (SOT-23-3 / TO-236-3), operating temperature range, and power dissipation capability. Parts are grouped into three categories based on substitution relationship:

Direct Equivalent (Identical Specifications): Parts maintaining 20 V nominal voltage, ±6% tolerance, 300 mW power rating, 55 Ohms impedance, and SOT-23-3 package with identical electrical performance.

Parametric Equivalent (Enhanced Tolerance): Parts with 20 V nominal voltage, improved tolerance (±2%), 300 mW power rating, and SOT-23-3 package, providing tighter voltage regulation at the cost of higher manufacturing selectivity.

Manufacturer Recommended Alternatives: Parts with 20 V nominal voltage, SOT-23-3 package compatibility, and operating temperature range of -65°C to 150°C, with variations in power dissipation (225–350 mW), tolerance (±1% to ±5%), and impedance (25–55 Ohms). These alternatives accommodate different application requirements while maintaining core functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Product Status	RoHS
BZX84C20-7	Diodes Incorporated	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Discontinued	Non-compliant
BZX84C20-7-F	Diodes Incorporated	20 V	±6%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84B20-7-F	Diodes Incorporated	20 V	±2%	300 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-A20,215	NXP Semiconductors	20 V	±1%	250 mW	55 Ω	50 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	TO-236-3	Active	ROHS3 Compliant
BZX84-C20,215	Nexperia USA Inc.	20 V	±5%	250 mW	55 Ω	50 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	TO-236-3	Active	ROHS3 Compliant
BZX84-C20,235	Nexperia USA Inc.	20 V	±5%	250 mW	55 Ω	50 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	TO-236-3	Active	ROHS3 Compliant
BZX84C20-TP	Micro Commercial Co	20 V	±5%	350 mW	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-55 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84C20LT1G	onsemi	20 V	±6%	225 mW	55 Ω	50 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
MMBZ5250B-TP	Micro Commercial Co	20 V	±5%	350 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-55 to 150°C	SOT-23-3	Active	ROHS3 Compliant
MMBZ5250BLT1G	onsemi	20 V	±5%	225 mW	25 Ω	100 nA @ 15 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
SZBZX84C20ET1G	onsemi	20 V	±6%	225 mW	55 Ω	50 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred): BZX84C20-7-F is the direct equivalent with identical electrical specifications and active product status. This part is ROHS3 compliant and available in Tape & Reel packaging, making it the primary choice for direct substitution in production environments.

Enhanced Tolerance Alternative: BZX84B20-7-F provides improved voltage tolerance (±2% versus ±6%) while maintaining identical power rating and impedance. This part is suitable for applications requiring tighter Zener voltage regulation and is ROHS3 compliant with active status.

Automotive-Grade Options: BZX84-A20,215 and BZX84-C20,215/235 are AEC-Q101 qualified automotive-grade alternatives from NXP and Nexperia. These parts feature reduced reverse leakage current (50 nA versus 100 nA) and are suitable for automotive and high-reliability applications. Power dissipation is reduced to 250 mW, requiring verification for applications demanding full 300 mW capability.

Higher Power Capability: BZX84C20-TP and MMBZ5250B-TP offer increased power dissipation (350 mW) for applications requiring higher thermal headroom. BZX84C20-TP maintains 55 Ohms impedance, while MMBZ5250B-TP features lower impedance (25 Ohms) for improved voltage regulation. Operating temperature minimum is -55°C for these parts.

Lower Power Alternatives: BZX84C20LT1G, MMBZ5250BLT1G, and SZBZX84C20ET1G provide 225 mW power dissipation suitable for space-constrained or lower-power applications. SZBZX84C20ET1G includes AEC-Q101 automotive qualification. All three maintain -65°C lower temperature limit.

All substitute parts are ROHS3 compliant and REACH unaffected, with active product status ensuring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can BZX84C20-7-F be used as a direct replacement for BZX84C20-7?

A: Yes. BZX84C20-7-F is electrically and mechanically identical to BZX84C20-7, with identical Zener voltage (20 V), tolerance (±6%), power rating (300 mW), impedance (55 Ohms), and SOT-23-3 package. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 compliant).

Q: What is the difference between BZX84C20-7-F and BZX84B20-7-F?

A: Both parts share identical power rating (300 mW), impedance (55 Ohms), and package (SOT-23-3). The key difference is voltage tolerance: BZX84C20-7-F has ±6% tolerance, while BZX84B20-7-F has ±2% tolerance. BZX84B20-7-F is suitable for applications requiring tighter voltage regulation.

Q: Are NXP BZX84-A20,215 and Nexperia BZX84-C20,215 suitable replacements?

A: These parts are functionally compatible with 20 V nominal voltage and SOT-23-3 package compatibility. However, power dissipation is reduced to 250 mW (versus 300 mW), and reverse leakage current is lower (50 nA versus 100 nA). Applications requiring full 300 mW capability must verify thermal performance. Both parts are AEC-Q101 qualified for automotive use.

Q: What is the advantage of MMBZ5250B-TP over BZX84C20-TP?

A: Both parts offer 350 mW power dissipation and 20 V nominal voltage in SOT-23-3 package. MMBZ5250B-TP features lower impedance (25 Ohms versus 55 Ohms), providing improved voltage regulation characteristics. Reverse leakage is measured at 15 V for MMBZ5250B-TP versus 14 V for BZX84C20-TP.

Q: Can lower power alternatives (225 mW) be used in place of the 300 mW original part?

A: Lower power alternatives (BZX84C20LT1G, MMBZ5250BLT1G, SZBZX84C20ET1G) are suitable only for applications where thermal dissipation does not exceed 225 mW. Circuit design review is required to confirm power dissipation levels remain within the lower rating.

Q: What is the temperature range difference between BZX84C20-TP and other alternatives?

A: BZX84C20-TP and MMBZ5250B-TP have operating temperature range of -55°C to 150°C, with a higher minimum temperature limit compared to the original BZX84C20-7 (-65°C to 150°C). Applications requiring operation below -55°C must use alternatives with -65°C minimum rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original BZX84C20-7 is RoHS non-compliant, making ROHS3 compliant alternatives necessary for applications subject to RoHS regulations.

Q: What packaging options are available for these substitute parts?

A: Packaging varies by part number. BZX84C20-7-F and BZX84B20-7-F are supplied in Tape & Reel (TR). NXP and Nexperia parts are supplied in Tape & Reel or Bulk. onsemi parts (BZX84C20LT1G, MMBZ5250BLT1G, SZBZX84C20ET1G) are supplied in Tape & Reel or Cut Tape & Digi-Reel. Verify packaging requirements for production processes.

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