BZX84C20-TP Equivalent & Substitute Parts

Part Overview

The BZX84C20-TP is a 20 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW power dissipation with ±5% voltage tolerance. This surface mount component in SOT-23 packaging is designed for voltage regulation and protection applications in electronic circuits. The part is currently Active in product status and RoHS3 compliant.

Equivalent and substitute parts are identified based on matching core electrical parameters: nominal Zener voltage (20 V), package type (SOT-23/TO-236-3), mounting configuration (surface mount), and operating temperature range compatibility. Substitutes may vary in power rating, tolerance, impedance, and reverse leakage characteristics within acceptable engineering limits.

Key Parameters

Parameter	BZX84C20-TP
Voltage - Zener (Nom)	20 V
Tolerance	±5%
Power - Max	350 mW
Impedance (Max)	55 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZX84C20-TP is determined by the following critical parameters:

Primary Matching Criteria:

Nominal Zener voltage: 20 V (exact match required)
Package type: SOT-23-3 / TO-236-3 (physical and electrical compatibility)
Mounting type: Surface Mount
RoHS3 compliance status

Secondary Compatibility Parameters:

Power rating: 250 mW to 350 mW (acceptable range for most applications)
Voltage tolerance: ±1% to ±6% (tighter tolerance acceptable; looser tolerance acceptable with design verification)
Impedance: 25 Ohms to 55 Ohms (lower impedance acceptable)
Reverse leakage current: 50 nA to 100 nA @ 14-15 V (acceptable variation)
Operating temperature range: -55°C to -65°C minimum; 150°C maximum (extended range acceptable)

Substitute parts are grouped by manufacturer and product status. All listed substitutes maintain the 20 V Zener voltage specification and SOT-23 package configuration. Variations in power dissipation, tolerance, and impedance reflect different design approaches within the same functional category.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Operating Temp	Product Status	Packaging
BZX84C20-TP	Micro Commercial Co	20 V	±5%	350 mW	55 Ohms	100 nA @ 14 V	-55°C ~ 150°C	Active	Tape & Reel
BZX84C20-7-F	Diodes Incorporated	20 V	±6%	300 mW	55 Ohms	100 nA @ 14 V	-65°C ~ 150°C	Active	Tape & Reel
BZX84-A20,215	NXP Semiconductors	20 V	±1%	250 mW	55 Ohms	50 nA @ 14 V	-65°C ~ 150°C	Active	Bulk
BZX84-C20,215	Nexperia USA Inc.	20 V	±5%	250 mW	55 Ohms	50 nA @ 14 V	-65°C ~ 150°C	Active	Tape & Reel
BZX84-C20,235	Nexperia USA Inc.	20 V	±5%	250 mW	55 Ohms	50 nA @ 14 V	-65°C ~ 150°C	Active	Tape & Reel
BZX84B20-E3-08	Vishay General Semiconductor	20 V	±2%	300 mW	55 Ohms	50 nA @ 14 V	-55°C ~ 150°C	Active	Tape & Reel
BZX84C20-E3-08	Vishay General Semiconductor	20 V	±5%	300 mW	55 Ohms	50 nA @ 14 V	-55°C ~ 150°C	Active	Tape & Reel
BZX84C20-HE3-08	Vishay General Semiconductor	20 V	±5%	300 mW	55 Ohms	50 nA @ 14 V	-55°C ~ 150°C	Obsolete	Cut Tape & Digi-Reel
BZX84C20LT1G	onsemi	20 V	±6%	225 mW	55 Ohms	50 nA @ 14 V	-65°C ~ 150°C	Active	Tape & Reel
MMBZ5250B-7-F	Diodes Incorporated	20 V	±5%	350 mW	25 Ohms	100 nA @ 15 V	-65°C ~ 150°C	Active	Tape & Reel
MMBZ5250BLT1G	onsemi	20 V	±5%	225 mW	25 Ohms	100 nA @ 15 V	-65°C ~ 150°C	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BZX84C20-E3-08 (Vishay) and BZX84C20-7-F (Diodes Incorporated) are functionally equivalent to BZX84C20-TP. Both maintain 20 V nominal Zener voltage, ±5% tolerance matching, 300 mW power rating, and identical impedance. Both are Active products with RoHS3 compliance. Operating temperature range extends to -65°C minimum, providing enhanced low-temperature performance. These parts are suitable for direct replacement in existing designs.

Compatible Substitutes (Acceptable Variations):

BZX84-C20,215 and BZX84-C20,235 (Nexperia USA Inc.) provide 20 V Zener voltage with ±5% tolerance and extended operating temperature range (-65°C to 150°C). Power rating is reduced to 250 mW. These parts are suitable for applications where power dissipation does not exceed 250 mW. Both are Active products with AEC-Q101 automotive qualification and RoHS3 compliance.

BZX84-A20,215 (NXP Semiconductors) offers superior voltage tolerance (±1%) and extended temperature range. Power rating is 250 mW. This part is suitable for precision voltage regulation applications. Active product status and AEC-Q101 qualification are provided.

BZX84B20-E3-08 (Vishay) provides 300 mW power rating with ±2% tolerance and identical impedance. Operating temperature range matches the original part (-55°C to 150°C). Active product status and RoHS3 compliance are maintained.

Lower Power Alternatives:

BZX84C20LT1G (onsemi) and MMBZ5250BLT1G (onsemi) are suitable for applications with reduced power dissipation requirements (225 mW). Both maintain 20 V Zener voltage and extended operating temperature range (-65°C to 150°C). Lower impedance (25 Ohms) in MMBZ5250BLT1G provides improved dynamic response. Both are Active products with RoHS3 compliance.

Higher Performance Alternative:

MMBZ5250B-7-F (Diodes Incorporated) matches the original 350 mW power rating and ±5% tolerance. Impedance is reduced to 25 Ohms, providing superior dynamic characteristics. Operating temperature range extends to -65°C minimum. Active product status and RoHS3 compliance are provided.

Obsolete Part:

BZX84C20-HE3-08 (Vishay) is marked Obsolete and should not be selected for new designs, despite technical compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can BZX84C20-7-F replace BZX84C20-TP directly?

A: Yes. Both parts maintain 20 V nominal Zener voltage, ±5% tolerance, and identical impedance (55 Ohms). BZX84C20-7-F provides 300 mW power rating versus 350 mW in the original part. Extended operating temperature range (-65°C to 150°C) is provided. Direct substitution is acceptable for applications where power dissipation does not exceed 300 mW.

Q: What is the difference between BZX84-C20,215 and BZX84-C20,235?

A: Both parts are manufactured by Nexperia USA Inc. and provide identical electrical specifications: 20 V Zener voltage, ±5% tolerance, 250 mW power rating, 55 Ohms impedance, and -65°C to 150°C operating temperature range. Both include AEC-Q101 automotive qualification. The part numbers reflect different packaging or distribution configurations. Electrical performance is equivalent.

Q: Is MMBZ5250B-7-F suitable as a substitute?

A: MMBZ5250B-7-F maintains 20 V Zener voltage, ±5% tolerance, and 350 mW power rating matching the original part. Impedance is reduced to 25 Ohms, providing improved dynamic response characteristics. Operating temperature range extends to -65°C minimum. This part is suitable for applications where lower impedance is beneficial or required.

Q: Why do some substitutes have lower power ratings?

A: BZX84C20LT1G and MMBZ5250BLT1G are rated for 225 mW power dissipation, lower than the original 350 mW specification. These parts are suitable for applications where actual power dissipation remains below 225 mW. Circuit design must verify that thermal and electrical requirements are met within the reduced power rating.

Q: What is the significance of impedance differences?

A: Impedance values range from 25 Ohms to 55 Ohms across substitute parts. Lower impedance (25 Ohms) provides faster transient response and improved voltage regulation under dynamic load conditions. Higher impedance (55 Ohms) is acceptable for static voltage regulation applications. Selection depends on circuit requirements for transient response and regulation accuracy.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All Active substitute parts listed are RoHS3 compliant. BZX84C20-HE3-08 is marked Obsolete and should not be used in new designs regardless of compliance status.

Q: Can BZX84-A20,215 be used in place of BZX84C20-TP?

A: BZX84-A20,215 provides superior voltage tolerance (±1% versus ±5%) and extended operating temperature range (-65°C to 150°C). Power rating is reduced to 250 mW. This part is suitable for precision voltage regulation applications where tighter tolerance is required and power dissipation does not exceed 250 mW. AEC-Q101 automotive qualification is provided.

Q: What packaging differences exist among substitutes?

A: All substitute parts use SOT-23-3 / TO-236-3 package configuration compatible with the original BZX84C20-TP. Packaging format varies: Tape & Reel (TR), Bulk, and Cut Tape & Digi-Reel. These differences reflect distribution and handling methods and do not affect electrical performance or physical compatibility in circuit board assembly.

Q: Should BZX84C20-HE3-08 be considered for new designs?

A: No. BZX84C20-HE3-08 is marked Obsolete and should not be selected for new designs. Active alternatives with equivalent or superior specifications are available from multiple manufacturers.

Q: How do tolerance specifications affect circuit performance?

A: Tolerance specifications define the acceptable variation range of nominal Zener voltage. BZX84-A20,215 provides ±1% tolerance (tightest control), while BZX84C20-7-F and BZX84C20LT1G provide ±6% tolerance (widest variation). Tighter tolerance is beneficial for precision voltage regulation. Looser tolerance is acceptable for general-purpose protection applications. Circuit design must verify that voltage regulation requirements are met within the selected part's tolerance range.

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