BZX79-C13,143 Equivalent & Substitute Parts

Part Overview

The BZX79-C13,143 is a Zener diode manufactured by Nexperia USA Inc., rated at 13 V nominal with 400 mW maximum power dissipation and ±5% tolerance. 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 part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to address component availability, inventory requirements, packaging preferences, or specific application constraints while maintaining functional compatibility within the electrical and mechanical parameters of this Zener diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	—
Power - Max	400	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 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-C13,143 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or superior electrical specifications across all critical parameters: 13 V nominal Zener voltage, 400 mW power rating, ±5% or tighter tolerance, 30 Ohms maximum impedance, 100 nA reverse leakage current, and 900 mV forward voltage. These parts are direct functional replacements with no circuit redesign required. Parametric equivalents include BZX79-B13,133, BZX79-B13,143, and BZX79-C13,133.

Similar Substitutes share the 13 V nominal Zener voltage and ±5% tolerance but differ in one or more secondary parameters such as power rating, impedance, reverse leakage current, forward voltage, or package configuration. These parts require application-level verification to confirm suitability. Similar substitutes include 1N5243B-TAP (500 mW), BZX79C13-T50A (500 mW), and 1N5350BRLG (5 W). Parts with different nominal Zener voltages (1N759A-1 at 12 V, 1N963B at 12 V) are listed as similar substitutes due to voltage deviation outside the ±5% tolerance band of the primary part.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS
BZX79-C13,143	Nexperia USA Inc.	13 V	±5%	400 mW	30 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 200°C	DO-204AH (DO-35)	ROHS3
BZX79-B13,133	NXP USA Inc.	13 V	±2%	400 mW	30 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 200°C	DO-204AH (DO-35)	Not specified
BZX79-B13,143	NXP USA Inc.	13 V	±2%	400 mW	30 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 200°C	DO-204AH (DO-35)	Not specified
BZX79-C13,133	NXP Semiconductors	13 V	±5%	400 mW	30 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 200°C	DO-204AH (DO-35)	Not specified
1N5243B-TAP	Vishay General Semiconductor	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	1.1 V @ 200 mA	-65 to 175°C	DO-204AH (DO-35)	ROHS3
BZX79C13-T50A	onsemi	13 V	±5%	500 mW	30 Ω	100 nA @ 8 V	1.5 V @ 100 mA	-65 to 200°C	DO-204AH (DO-35)	ROHS3
1N5350BRLG	onsemi	13 V	±5%	5 W	2.5 Ω	1 µA @ 9.9 V	1.2 V @ 1 A	-65 to 200°C	T-18 Axial	ROHS3
1N759A-1	Microchip Technology	12 V	±5%	500 mW	10 Ω	1 µA @ 9 V	1.1 V @ 200 mA	-65 to 175°C	DO-204AH (DO-35)	Non-compliant
1N963B	Microchip Technology	12 V	±5%	500 mW	11.5 Ω	5 µA @ 9.1 V	1.1 V @ 200 mA	-65 to 175°C	DO-204AA (DO-7)	Non-compliant

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements)

BZX79-B13,133 and BZX79-B13,143 are parametric equivalents with tighter ±2% tolerance compared to the ±5% tolerance of the primary part. Both maintain identical 13 V nominal voltage, 400 mW power rating, 30 Ohms impedance, and -65°C to 200°C operating range. These parts are suitable for applications requiring improved voltage accuracy. RoHS compliance status is not specified for these NXP parts.

BZX79-C13,133 is a parametric equivalent manufactured by NXP Semiconductors with matching ±5% tolerance, 13 V nominal voltage, 400 mW power rating, and identical electrical characteristics. This part is suitable as a direct functional replacement.

Similar Substitutes (Application-Dependent)

1N5243B-TAP (Vishay) provides 500 mW power rating with 13 Ohms impedance, representing a higher power capability than the primary part. Operating temperature range is -65°C to 175°C (5°C lower maximum). ROHS3 compliant. Suitable for applications requiring increased power dissipation margin.

BZX79C13-T50A (onsemi) offers 500 mW power rating while maintaining 30 Ohms impedance and full -65°C to 200°C operating range. ROHS3 compliant. Forward voltage is specified at 1.5 V @ 100 mA. Suitable for applications requiring higher power capability with extended temperature operation.

1N5350BRLG (onsemi) provides significantly higher 5 W power rating with reduced 2.5 Ohms impedance, suitable for high-power applications. Package is T-18 axial (larger form factor). ROHS3 compliant. Operating temperature range matches the primary part (-65°C to 200°C).

Non-Equivalent Substitutes (Voltage Deviation)

1N759A-1 (Microchip) and 1N963B (Microchip) are rated at 12 V nominal Zener voltage, representing a 1 V deviation from the 13 V primary part. This voltage difference exceeds the ±5% tolerance band and results in different circuit behavior. These parts are not suitable for direct substitution without circuit redesign. Both are RoHS non-compliant. 1N963B uses DO-7 package (different from DO-35).

Frequently Asked Questions (FAQ)

Q: Can BZX79-B13,133 or BZX79-B13,143 be used as direct replacements for BZX79-C13,143?

A: Yes. Both parts are parametric equivalents with identical 13 V nominal voltage, 400 mW power rating, 30 Ohms impedance, and -65°C to 200°C operating range. The primary difference is tighter ±2% tolerance versus ±5% tolerance on the primary part, which provides improved voltage accuracy. No circuit modification is required.

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

A: Parametric equivalents maintain all critical electrical specifications (voltage, power, impedance, leakage current, forward voltage) and operating temperature range. Similar substitutes share the 13 V nominal voltage but differ in secondary parameters such as power rating, impedance, or reverse leakage current. Similar substitutes require application-level verification to confirm suitability.

Q: Can 1N5243B-TAP replace BZX79-C13,143 in my circuit?

A: 1N5243B-TAP is a similar substitute with matching 13 V nominal voltage and ±5% tolerance. It provides higher 500 mW power rating (versus 400 mW) and lower 13 Ohms impedance (versus 30 Ohms). The maximum operating temperature is 175°C (5°C lower than the primary part). Substitution is possible if the application does not require operation above 175°C and can tolerate the impedance difference.

Q: Why are 1N759A-1 and 1N963B listed as substitutes if they have 12 V rating?

A: These parts are listed as similar substitutes due to their availability in the component ecosystem. However, the 12 V nominal voltage deviates from the 13 V primary part by approximately 7.7%, exceeding the ±5% tolerance band. These parts are not suitable for direct substitution without circuit redesign and voltage regulation adjustments.

Q: What is the package difference between BZX79-C13,143 and 1N5350BRLG?

A: BZX79-C13,143 uses DO-204AH (DO-35) axial package, a standard small-signal Zener diode form factor. 1N5350BRLG uses T-18 axial package, a larger form factor designed for higher power dissipation (5 W versus 400 mW). The larger package accommodates increased thermal requirements. PCB layout and mounting considerations differ between these packages.

Q: Are all substitute parts ROHS3 compliant?

A: No. BZX79-B13,133, BZX79-B13,143, and BZX79-C13,133 do not specify RoHS compliance status. 1N5243B-TAP, BZX79C13-T50A, and 1N5350BRLG are ROHS3 compliant. 1N759A-1 and 1N963B are RoHS non-compliant. Verify RoHS compliance requirements for your application before selecting a substitute part.

Q: Can BZX79C13-T50A be used in place of BZX79-C13,143?

A: Yes. BZX79C13-T50A is a similar substitute with matching 13 V nominal voltage, ±5% tolerance, and identical 30 Ohms impedance. It provides higher 500 mW power rating (versus 400 mW) and maintains the full -65°C to 200°C operating range. ROHS3 compliant. Substitution is suitable for applications requiring increased power dissipation margin.

Q: What does impedance (Zzt) represent in Zener diode selection?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode in the reverse-biased region. Lower impedance indicates better voltage regulation and reduced voltage variation across the diode as current changes. The primary part specifies 30 Ohms maximum impedance. Similar substitutes may have different impedance values (1N5243B-TAP at 13 Ohms, 1N5350BRLG at 2.5 Ohms), affecting voltage regulation performance.

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