BZX79-C3V3,133 Equivalent & Substitute Parts

Part Overview

The BZX79-C3V3,133 is a through-hole zener diode manufactured by Nexperia USA Inc., rated at 3.3 V nominal zener voltage with 400 mW maximum power dissipation. The device is packaged in DO-204AH (DO-35) axial configuration and is classified as Active product status. This component is used in voltage regulation, protection, and reference circuits where precise voltage clamping is required. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	—
Power - Max	400	mW
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 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	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BZX79-C3V3,133 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or superior electrical specifications across all critical parameters: nominal zener voltage (3.3 V), maximum power dissipation (400 mW), impedance (95 Ohms), operating temperature range (-65°C to 200°C), and through-hole axial package configuration. These parts differ only in tolerance grade (±2% versus ±5%) or packaging format (Bulk versus Cut Tape), which do not affect functional interchangeability in circuit applications.

Similar Parts share the same nominal zener voltage (3.3 V) and through-hole axial package but deviate in one or more secondary parameters: maximum power dissipation (500 mW versus 400 mW), impedance characteristics, reverse leakage current, forward voltage characteristics, or operating temperature maximum (175°C versus 200°C). These parts are functionally compatible in applications where the higher power rating or alternative impedance does not create circuit constraints.

Key parameters determining substitution eligibility:

Nominal zener voltage: 3.3 V (required match)
Through-hole axial mounting: DO-204AH / DO-35 package (required match)
Maximum power dissipation: 400 mW minimum (higher ratings acceptable)
Operating temperature range: -65°C minimum, 200°C maximum preferred
Tolerance: ±5% or better (tighter tolerance acceptable)

Parameter Comparison

Parameter	BZX79-C3V3,133	BZX79-B3V3,133	BZX79-B3V3,143	BZX79-C3V3,143	1N4619-1	BZX79C3V3	BZX79C3V3-T50A
Manufacturer	Nexperia USA Inc.	NXP USA Inc.	Nexperia USA Inc.	NXP Semiconductors	Microchip Technology	Taiwan Semiconductor Corporation	Fairchild Semiconductor
Voltage - Zener (Nom)	3.3 V	3.3 V	3.3 V	3.3 V	3 V	3.3 V	3.3 V
Tolerance	±5%	±2%	±2%	±5%	±5%	±5%	±5%
Power - Max	400 mW	400 mW	400 mW	400 mW	500 mW	500 mW	500 mW
Impedance (Max)	95 Ohms	95 Ohms	95 Ohms	95 Ohms	1600 Ohms	95 Ohms	95 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1 V	5 µA @ 1 V	5 µA @ 1 V	5 µA @ 1 V	400 nA @ 1 V	25 µA @ 1 V	25 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA
Operating Temperature	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 175°C	-65 to 175°C	-65 to 200°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified	RoHS non-compliant	ROHS3 Compliant	Not specified
Packaging Format	Cut Tape (CT)	Bulk	Cut Tape (CT)	Bulk	Bulk	Tape & Reel (TR)	Bulk

Engineering Selection Recommendations

Parametric Equivalent Selection (Preferred for Direct Substitution)

BZX79-B3V3,133 and BZX79-B3V3,143 are parametric equivalents with tighter tolerance (±2% versus ±5%), identical power rating (400 mW), and matching impedance (95 Ohms). Both maintain the full operating temperature range (-65°C to 200°C) and are available in through-hole axial configuration. BZX79-B3V3,143 is available in Cut Tape packaging matching the original part format. BZX79-C3V3,143 is functionally identical to the main part with matching ±5% tolerance and 400 mW power rating, differing only in packaging format (Bulk versus Cut Tape).

Similar Part Selection (Conditional Compatibility)

1N4619-1 (Microchip Technology) shares the 3.3 V nominal voltage and through-hole axial package but operates at reduced maximum temperature (175°C versus 200°C) and exhibits significantly higher impedance (1600 Ohms versus 95 Ohms). This part is suitable only for applications where the lower temperature rating and impedance characteristics do not create circuit constraints. RoHS non-compliance status requires verification against procurement requirements.

BZX79C3V3 (Taiwan Semiconductor Corporation) and BZX79C3V3-T50A (Fairchild Semiconductor) both provide 500 mW power dissipation (25% higher than the main part) with matching 3.3 V nominal voltage and 95 Ohms impedance. BZX79C3V3 operates at reduced maximum temperature (175°C versus 200°C). BZX79C3V3-T50A maintains the full 200°C operating range. Both parts are suitable for applications requiring higher power dissipation margin or where the increased power rating provides design flexibility.

Compliance Considerations

For applications requiring RoHS3 compliance, select from BZX79-B3V3,143, BZX79-C3V3,143, or BZX79C3V3. The 1N4619-1 is RoHS non-compliant and unsuitable for regulated procurement environments. All recommended parts carry EAR99 export classification and are REACH Unaffected or REACH Compliant.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B3V3,133 directly replace BZX79-C3V3,133 in production?

A: Yes. BZX79-B3V3,133 is a parametric equivalent with superior tolerance (±2% versus ±5%), identical power rating (400 mW), matching impedance (95 Ohms), and full operating temperature range (-65°C to 200°C). The tighter tolerance provides improved voltage regulation accuracy without circuit modification.

Q: What is the difference between BZX79-B3V3,143 and BZX79-C3V3,143?

A: Both parts are functionally equivalent with identical electrical specifications (3.3 V nominal, 400 mW power, 95 Ohms impedance, -65°C to 200°C operating range). The primary difference is packaging format: BZX79-B3V3,143 is supplied in Cut Tape (CT) matching the original part format, while BZX79-C3V3,143 is supplied in Bulk. BZX79-B3V3,143 has tighter tolerance (±2% versus ±5%).

Q: Can 1N4619-1 be used as a substitute?

A: 1N4619-1 shares the 3.3 V nominal voltage and through-hole axial package but differs in three critical parameters: maximum operating temperature (175°C versus 200°C), impedance (1600 Ohms versus 95 Ohms), and RoHS compliance status (non-compliant). This part is suitable only for applications where the reduced temperature rating and higher impedance do not create circuit constraints and where RoHS compliance is not required.

Q: What advantage does BZX79C3V3-T50A provide over the main part?

A: BZX79C3V3-T50A provides 25% higher power dissipation (500 mW versus 400 mW) while maintaining the same 3.3 V nominal voltage, 95 Ohms impedance, and full operating temperature range (-65°C to 200°C). This higher power rating provides additional thermal margin in applications with variable load conditions or higher ambient temperatures.

Q: Are all substitute parts available in the same package configuration?

A: All substitute parts are available in DO-204AH / DO-35 axial through-hole configuration, ensuring mechanical compatibility with the original part. Packaging formats (Cut Tape, Bulk, Tape & Reel) differ by supplier and do not affect circuit functionality. Verify packaging format requirements for your procurement process.

Q: Which substitute part offers the best compliance profile?

A: BZX79-B3V3,143 and BZX79-C3V3,143 both carry ROHS3 Compliant status, matching the original part. BZX79C3V3 also carries ROHS3 Compliant status. All recommended parts are REACH Unaffected or REACH Compliant and carry EAR99 export classification. 1N4619-1 is RoHS non-compliant and unsuitable for regulated procurement environments.

Q: Can substitute parts be mixed in the same production batch?

A: Parametric equivalents (BZX79-B3V3,133, BZX79-B3V3,143, BZX79-C3V3,143) are interchangeable without circuit modification due to identical electrical specifications and package configuration. Similar parts (1N4619-1, BZX79C3V3, BZX79C3V3-T50A) introduce parameter variations that may affect circuit performance. Mixing part types within a single production batch requires circuit analysis to confirm compatibility with tolerance and impedance variations.

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