BZX79-C15,143 Equivalent & Substitute Parts

Part Overview

The BZX79-C15,143 is a 15 V Zener diode rated at 400 mW with ±5% tolerance, manufactured by Nexperia USA Inc. in the DO-204AH (DO-35) axial through-hole package. This component is classified as Active and maintains full RoHS3 compliance. The device operates across a temperature range of -65°C to 200°C and is suitable for voltage regulation and protection applications in electronic circuits.

Equivalent and substitute parts are identified based on matching or exceeding electrical performance parameters while maintaining compatible mechanical form factors and thermal operating ranges. Substitution becomes necessary when the primary part experiences supply constraints, inventory limitations, or when design flexibility permits selection from alternative manufacturers offering equivalent functional performance.

Key Parameters

Parameter	BZX79-C15,143 Specification
Voltage - Zener (Nom)	15 V
Tolerance	±5%
Power - Max	400 mW
Impedance (Max)	30 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 10.5 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the BZX79-C15,143:

Parametric Equivalents maintain identical nominal voltage (15 V), power rating (400 mW), package form factor (DO-35/DO-204AH), and operating temperature range (-65°C to 200°C). These parts differ only in tolerance specification or internal construction details that do not affect functional performance in standard applications. Parametric equivalents include BZX79-B15,133 and BZX79-C15,133.

Similar Substitutes share the same nominal voltage (15 V) and through-hole axial mounting configuration but differ in one or more of the following parameters: power dissipation rating, impedance, reverse leakage current, forward voltage characteristics, package designation, or operating temperature maximum. These parts are suitable for applications where the primary part is unavailable and the circuit design permits operation with the specified parameter variations.

Substitution eligibility is determined by the following key parameters:

Nominal Zener voltage: 15 V (required match)
Mounting type: Through Hole Axial (required match)
Operating temperature range: Must encompass or equal -65°C to 200°C
Power rating: Must equal or exceed 400 mW
RoHS compliance: ROHS3 Compliant (preferred)

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Substitute Type
BZX79-C15,143	Nexperia USA Inc.	15 V	±5%	400 mW	30 Ω	900 mV @ 10 mA	-65°C ~ 200°C	DO-35	Main Part
BZX79-B15,133	Nexperia USA Inc.	15 V	±2%	400 mW	30 Ω	900 mV @ 10 mA	-65°C ~ 200°C	DO-35	Parametric Equivalent
BZX79-C15,133	Nexperia USA Inc.	15 V	±5%	400 mW	30 Ω	900 mV @ 10 mA	-65°C ~ 200°C	DO-35	Parametric Equivalent
1N965B	NTE Electronics, Inc	15 V	±5%	500 mW	16 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-7	Similar Substitute
BZX79C15	Taiwan Semiconductor Corporation	15 V	±5%	500 mW	30 Ω	1.5 V @ 100 mA	-65°C ~ 175°C	DO-35	Similar Substitute
BZX79C15-T50A	Fairchild Semiconductor	15 V	±5%	500 mW	30 Ω	1.5 V @ 100 mA	-65°C ~ 200°C	DO-35	Similar Substitute
BZX79C15-T50R	Fairchild Semiconductor	15 V	±5%	500 mW	30 Ω	1.5 V @ 100 mA	-65°C ~ 200°C	DO-35	Similar Substitute
BZX85C15	Taiwan Semiconductor Corporation	15 V	±5%	1.3 W	15 Ω	1.2 V @ 10 mA	-65°C ~ 200°C	DO-41	Similar Substitute
BZX85C15-T50A	Fairchild Semiconductor	15 V	±6%	1 W	15 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Similar Substitute
BZX85C15-T50R	onsemi	15 V	±6%	1 W	15 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Similar Substitute

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitution)

BZX79-B15,133 and BZX79-C15,133 are direct parametric equivalents manufactured by Nexperia USA Inc. Both parts maintain identical electrical specifications, package form factor, and operating temperature range as the BZX79-C15,143. The BZX79-B15,133 offers improved tolerance specification (±2% versus ±5%), providing tighter voltage regulation in applications requiring enhanced precision. Both parts are Active status products with ROHS3 compliance and unlimited moisture sensitivity rating. These parts are suitable for direct pin-for-pin replacement without circuit modification.

Similar Substitutes with DO-35 Package (400 mW to 500 mW)

BZX79C15 (Taiwan Semiconductor Corporation), BZX79C15-T50A, and BZX79C15-T50R (Fairchild Semiconductor) maintain the DO-35 package form factor with increased power dissipation (500 mW versus 400 mW). These parts are compatible with the BZX79-C15,143 in applications where the circuit board layout and thermal environment support the slightly higher power rating. The BZX79C15-T50A and BZX79C15-T50R variants from Fairchild extend the maximum operating temperature to 200°C, matching the primary part specification. The Taiwan Semiconductor BZX79C15 operates to 175°C maximum, which may limit suitability in high-temperature applications.

1N965B (NTE Electronics, Inc) provides a DO-7 package alternative with 500 mW power rating. This part operates to 175°C maximum and exhibits lower impedance (16 Ω versus 30 Ω), resulting in improved voltage regulation characteristics. The DO-7 package is mechanically compatible with DO-35 mounting holes but features different lead geometry. This part is suitable for applications where the circuit design permits package form factor variation.

Similar Substitutes with DO-41 Package (1 W to 1.3 W)

BZX85C15 (Taiwan Semiconductor Corporation), BZX85C15-T50A (Fairchild Semiconductor), and BZX85C15-T50R (onsemi) are higher power variants rated at 1 W to 1.3 W in the DO-41 package. These parts are suitable for applications requiring increased thermal dissipation capacity or where circuit design permits use of a larger package form factor. All three parts maintain the 15 V nominal voltage and -65°C to 200°C operating range. The BZX85C15-T50A and BZX85C15-T50R variants feature ±6% tolerance specification. These parts are not direct mechanical substitutes for the DO-35 package but are electrically compatible for voltage regulation and protection functions.

All substitute parts listed maintain ROHS3 compliance or equivalent environmental certification status, ensuring compatibility with modern manufacturing and end-use requirements.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B15,133 be used as a direct replacement for BZX79-C15,143?

A: Yes. BZX79-B15,133 is a parametric equivalent with identical nominal voltage (15 V), power rating (400 mW), package (DO-35), and operating temperature range (-65°C to 200°C). The ±2% tolerance specification of BZX79-B15,133 is tighter than the ±5% tolerance of BZX79-C15,143, making it suitable for direct pin-for-pin replacement without circuit modification.

Q: What is the difference between parametric equivalents and similar substitutes?

A: Parametric equivalents (BZX79-B15,133 and BZX79-C15,133) maintain all electrical and mechanical specifications of the primary part, differing only in tolerance or internal construction. Similar substitutes share the same nominal voltage and mounting type but differ in power rating, package designation, impedance, or operating temperature range. Similar substitutes require circuit design verification to confirm compatibility.

Q: Can I use BZX79C15-T50A or BZX79C15-T50R instead of BZX79-C15,143?

A: Yes, with design verification. Both parts maintain the DO-35 package, 15 V nominal voltage, and -65°C to 200°C operating range. The increased power rating (500 mW versus 400 mW) is compatible with the primary part application. Forward voltage characteristics differ slightly, which may affect circuit performance in precision voltage reference applications.

Q: Are DO-41 package parts (BZX85C15 series) compatible with BZX79-C15,143?

A: DO-41 parts are electrically compatible but not mechanically interchangeable without circuit board modification. The DO-41 package is physically larger than DO-35. These parts are suitable for applications where increased power dissipation is required and the circuit board layout permits the larger package form factor.

Q: What is the operating temperature limitation of 1N965B compared to BZX79-C15,143?

A: 1N965B operates to 175°C maximum, while BZX79-C15,143 operates to 200°C maximum. This 25°C difference may be significant in high-temperature applications. 1N965B is suitable for applications operating within the -65°C to 175°C range.

Q: Does tolerance specification affect substitution suitability?

A: Tolerance specification affects voltage regulation precision. BZX79-B15,133 (±2% tolerance) provides tighter voltage control than BZX79-C15,143 (±5% tolerance). BZX85C15-T50A and BZX85C15-T50R (±6% tolerance) provide looser tolerance. Substitution is acceptable when the circuit design accommodates the tolerance specification of the substitute part.

Q: Can I substitute a higher power-rated part in a circuit designed for 400 mW?

A: Yes. Higher power-rated parts (500 mW, 1 W, or 1.3 W) are suitable for circuits designed for 400 mW operation. The higher power rating provides additional thermal margin and does not degrade circuit performance. Verify that the package form factor is compatible with the circuit board layout.

Q: What RoHS compliance status applies to all substitute parts?

A: All listed substitute parts maintain ROHS3 compliance or equivalent environmental certification. BZX79-B15,133, BZX79-C15,133, 1N965B, BZX79C15, BZX85C15, and BZX85C15-T50R are explicitly ROHS3 compliant. BZX79C15-T50A and BZX85C15-T50A do not specify RoHS status but are manufactured to equivalent environmental standards.

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