BZX79-C20,143 Equivalent & Substitute Parts

Part Overview

The BZX79-C20,143 is a Zener diode manufactured by Nexperia USA Inc., rated at 20 V nominal voltage with 400 mW maximum power dissipation. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in the DO-204AH (DO-35) axial configuration. The device maintains an active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to address application requirements including packaging preferences, tolerance specifications, power rating variations, and inventory availability while maintaining core electrical functionality at 20 V nominal Zener voltage.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5%	—
Power - Max	400	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 14 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution relationships for the BZX79-C20,143 are established based on the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 20 V (exact match required)
Mounting Type: Through Hole (required for mechanical compatibility)
Operating Temperature Range: Minimum -65°C to 200°C coverage
Package / Case: Axial configuration (mechanical fit)

Secondary Variation Parameters:

Tolerance: ±2% to ±6% acceptable (tighter tolerance provides improved performance)
Power - Max: 400 mW to 5 W (higher power rating provides design margin)
Impedance (Max): 55 Ohms or lower (lower impedance indicates improved performance)
Current - Reverse Leakage: Variation acceptable within application requirements

Substitute Categories:

Parametric Equivalent: BZX79-B20,143 and BZX79-C20,133 maintain identical electrical specifications with variations in tolerance (±2% vs. ±5%) and packaging format (Bulk vs. Cut Tape).

Direct Manufacturer Equivalent: 1N5357BRLG provides higher power rating (5 W vs. 400 mW) with improved impedance characteristics (3 Ohms vs. 55 Ohms), suitable for applications requiring enhanced thermal performance.

Similar Functional Equivalent: 1N5357BG, BZT03C20-TR, and BZX55B20-TAP offer 20 V Zener voltage with variations in power dissipation, impedance, and package configuration.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Packaging Type
BZX79-C20,143	Nexperia USA Inc.	20 V	±5%	400 mW	55 Ω	900 mV @ 10 mA	-65 to 200°C	DO-204AH, DO-35	Cut Tape
BZX79-B20,143	NXP Semiconductors	20 V	±2%	400 mW	55 Ω	900 mV @ 10 mA	-65 to 200°C	DO-204AH, DO-35	Bulk
BZX79-C20,133	Nexperia USA Inc.	20 V	±5%	400 mW	55 Ω	900 mV @ 10 mA	-65 to 200°C	DO-204AH, DO-35	Cut Tape
1N5357BRLG	onsemi	20 V	±5%	5 W	3 Ω	1.2 V @ 1 A	-65 to 200°C	T-18, Axial	Cut Tape
1N5357BG	onsemi	20 V	±5%	5 W	3 Ω	1.2 V @ 1 A	-65 to 200°C	T-18, Axial	Bulk
BZT03C20-TR	Vishay General Semiconductor	20 V	±6%	1.3 W	15 Ω	1.2 V @ 500 mA	-65 to 175°C	SOD-57, Axial	Cut Tape
BZX55B20-TAP	Vishay General Semiconductor	20 V	±2%	500 mW	55 Ω	1.5 V @ 200 mA	-65 to 175°C	DO-204AH, DO-35	Cut Tape

Engineering Selection Recommendations

BZX79-B20,143 (NXP Semiconductors) Selection basis: Identical electrical performance to BZX79-C20,143 with improved tolerance specification (±2% vs. ±5%). Maintains 400 mW power rating, 55 Ohm impedance, and -65°C to 200°C operating range. Supplied in Bulk packaging. ROHS3 compliant. Suitable for applications requiring tighter voltage tolerance with equivalent thermal performance.

BZX79-C20,133 (Nexperia USA Inc.) Selection basis: Parametric equivalent with identical specifications to BZX79-C20,143. Maintains ±5% tolerance, 400 mW power rating, and full temperature range. Supplied in Cut Tape packaging. ROHS3 compliant. Direct substitution for inventory continuity or packaging format preference.

1N5357BRLG (onsemi) Selection basis: Higher power rating (5 W vs. 400 mW) with significantly lower impedance (3 Ohms vs. 55 Ohms). Maintains 20 V nominal voltage and -65°C to 200°C operating range. T-18 axial package. ROHS3 compliant. Suitable for applications requiring enhanced thermal dissipation and improved dynamic response characteristics.

1N5357BG (onsemi) Selection basis: Identical electrical specifications to 1N5357BRLG with Bulk packaging format. 5 W power rating and 3 Ohm impedance. ROHS3 compliant. Selection appropriate when higher power dissipation capability and lower impedance are required with bulk supply preference.

BZT03C20-TR (Vishay General Semiconductor) Selection basis: Intermediate power rating (1.3 W) with improved impedance (15 Ohms). SOD-57 package configuration. Maintains 20 V nominal voltage. Operating temperature limited to 175°C maximum. ROHS3 compliant. Suitable for applications requiring moderate power dissipation with alternative package form factor.

BZX55B20-TAP (Vishay General Semiconductor) Selection basis: Improved tolerance (±2%) with 500 mW power rating. Maintains 55 Ohm impedance and DO-35 package compatibility. Operating temperature range -65°C to 175°C. AEC-Q101 automotive qualification. ROHS3 compliant. Selection appropriate for automotive applications or when tighter tolerance with slightly higher power rating is required.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B20,143 be used as a direct replacement for BZX79-C20,143?

A: Yes. BZX79-B20,143 is a parametric equivalent with identical voltage (20 V), power rating (400 mW), impedance (55 Ohms), and operating temperature range (-65°C to 200°C). The primary difference is improved tolerance specification (±2% vs. ±5%) and packaging format (Bulk vs. Cut Tape). Both are ROHS3 compliant through-hole components in DO-35 package configuration.

Q: What is the difference between 1N5357BRLG and BZX79-C20,143?

A: Both devices maintain 20 V nominal Zener voltage and -65°C to 200°C operating range. Key differences are: 1N5357BRLG provides 5 W power dissipation versus 400 mW, impedance of 3 Ohms versus 55 Ohms, and T-18 axial package versus DO-35. The 1N5357BRLG is suitable for applications requiring higher thermal performance and lower dynamic impedance.

Q: Is BZT03C20-TR compatible with BZX79-C20,143 applications?

A: BZT03C20-TR maintains 20 V nominal voltage and through-hole axial mounting. Differences include: 1.3 W power rating (vs. 400 mW), 15 Ohm impedance (vs. 55 Ohms), SOD-57 package (vs. DO-35), and maximum operating temperature of 175°C (vs. 200°C). Compatibility depends on specific application thermal and impedance requirements.

Q: Why does BZX55B20-TAP have a higher power rating than BZX79-C20,143?

A: BZX55B20-TAP is rated at 500 mW versus 400 mW for BZX79-C20,143. Both maintain identical impedance (55 Ohms) and voltage (20 V). The higher power rating provides additional thermal margin. BZX55B20-TAP includes AEC-Q101 automotive qualification and operates to 175°C maximum (vs. 200°C).

Q: Can I use 1N5357BG in place of 1N5357BRLG?

A: Yes. Both parts are electrically identical with 20 V nominal voltage, 5 W power rating, 3 Ohm impedance, and -65°C to 200°C operating range. The difference is packaging format: 1N5357BG is supplied in Bulk while 1N5357BRLG is supplied in Cut Tape. Selection depends on procurement and assembly requirements.

Q: What packaging considerations apply when substituting these Zener diodes?

A: BZX79-C20,143, BZX79-B20,143, BZX79-C20,133, and BZX55B20-TAP all use DO-35 (DO-204AH) axial package with identical mechanical dimensions. 1N5357BRLG and 1N5357BG use T-18 axial package (larger form factor). BZT03C20-TR uses SOD-57 axial package. Physical board layout and PCB hole spacing must accommodate package differences.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (BZX79-B20,143, BZX79-C20,133, 1N5357BRLG, 1N5357BG, BZT03C20-TR, and BZX55B20-TAP) are ROHS3 compliant. All maintain REACH Unaffected status and EAR99 ECCN classification.

Q: Which substitute provides the tightest tolerance specification?

A: BZX79-B20,143 and BZX55B20-TAP both provide ±2% tolerance compared to ±5% for BZX79-C20,143. BZT03C20-TR provides ±6% tolerance. Selection of tighter tolerance depends on application voltage regulation requirements.

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