BZX79C13 Equivalent & Substitute Parts

Part Overview

The BZX79C13 is a Zener diode rated at 13 V nominal voltage with 500 mW maximum power dissipation in a DO-35 through-hole package. Manufactured by onsemi, this component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage regulation, power handling, and thermal operating ranges while accommodating available packaging and supplier configurations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 100 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX79C13 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 13 V
Tolerance: ±5%
Operating Temperature Range: -65°C to 200°C
Mounting Type: Through Hole
Package / Case: DO-35 or equivalent axial configuration

Secondary Compatibility Factors:

Impedance (Max): 30 Ohms maximum
Current - Reverse Leakage @ Vr: 100 nA @ 8 V maximum
Power - Max: 500 mW or greater

Substitute parts are grouped into two categories based on power rating alignment:

Category A - Full Power Rating Match (500 mW): BZX79C13-T50A maintains identical electrical specifications and maximum power dissipation, differing only in product status (active) and packaging configuration (cut tape).

Category B - Reduced Power Rating (400 mW): BZX79-C13,113 / BZX79-C13,133 / BZX79-C13,143 are manufactured by NXP Semiconductors and NXP USA Inc. These parts maintain voltage, tolerance, impedance, and leakage specifications but operate at 400 mW maximum power. Forward voltage characteristics differ at specified test conditions. These substitutes are suitable for applications where power dissipation does not exceed 400 mW.

Parameter Comparison

Parameter	BZX79C13 (Main)	BZX79C13-T50A	BZX79-C13,113	BZX79-C13,133	BZX79-C13,143
Manufacturer	onsemi	onsemi	NXP Semiconductors	NXP Semiconductors	NXP USA Inc.
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Zener (Nom)	13 V	13 V	13 V	13 V	13 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	400 mW	400 mW	400 mW
Impedance (Max)	30 Ohms	30 Ohms	30 Ohms	30 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
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
RoHS Status	Not specified	ROHS3 Compliant	Not specified	Not specified	Not specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BZX79C13-T50A (Primary Substitute)

BZX79C13-T50A is the direct equivalent for applications requiring full 500 mW power dissipation capability. This onsemi part maintains identical electrical specifications and is classified as active product status, ensuring long-term availability and supply chain continuity. The part is ROHS3 compliant and carries REACH Unaffected status. Packaging is supplied in cut tape (CT) configuration rather than bulk, suitable for automated assembly processes. Selection of this substitute eliminates any power rating derating and provides seamless functional replacement.

BZX79-C13,113 / BZX79-C13,133 / BZX79-C13,143 (Secondary Substitutes)

These NXP Semiconductors alternatives are suitable for applications where maximum power dissipation does not exceed 400 mW. All three parts maintain identical zener voltage (13 V), tolerance (±5%), impedance (30 Ohms maximum), and reverse leakage specifications. These parts are active products with high inventory availability. Selection of NXP alternatives is appropriate when circuit design permits operation within the 400 mW power envelope. Forward voltage characteristics differ at specified test conditions (900 mV @ 10 mA versus 1.5 V @ 100 mA), reflecting different measurement protocols rather than functional incompatibility in voltage regulation applications.

Compliance and Regulatory Considerations

All substitute parts carry REACH Unaffected status, matching the main part designation. BZX79C13-T50A provides ROHS3 compliance certification. Selection should account for specific regulatory requirements of the end application and target market.

Frequently Asked Questions (FAQ)

Q: Can BZX79-C13,113, BZX79-C13,133, or BZX79-C13,143 be used as direct replacements for BZX79C13?

A: These NXP parts are functionally compatible for voltage regulation at 13 V with ±5% tolerance across the full operating temperature range. However, maximum power dissipation is reduced to 400 mW. Direct substitution is valid only if circuit design does not require power dissipation exceeding 400 mW. If the original design operates at or near 500 mW, BZX79C13-T50A is the appropriate substitute.

Q: What is the difference between BZX79C13-T50A and the original BZX79C13?

A: Both parts are manufactured by onsemi and maintain identical electrical specifications: 13 V zener voltage, ±5% tolerance, 500 mW power rating, 30 Ohms maximum impedance, and -65°C to 200°C operating range. The primary differences are product status (BZX79C13-T50A is active; BZX79C13 is obsolete) and packaging configuration (cut tape versus bulk). BZX79C13-T50A is ROHS3 compliant.

Q: Are the three NXP part numbers (BZX79-C13,113, BZX79-C13,133, BZX79-C13,143) electrically identical?

A: Yes. All three NXP part numbers maintain identical electrical specifications: 13 V zener voltage, ±5% tolerance, 400 mW power rating, 30 Ohms maximum impedance, 100 nA reverse leakage @ 8 V, and -65°C to 200°C operating range. Differences are limited to manufacturer designation codes and packaging bulk configuration. Selection among these three is based on supplier availability and inventory status.

Q: What does the forward voltage difference (1.5 V @ 100 mA for onsemi versus 900 mV @ 10 mA for NXP) indicate?

A: Forward voltage specifications are measured at different test conditions. The onsemi specification (1.5 V @ 100 mA) represents forward bias operation at higher current, while the NXP specification (900 mV @ 10 mA) represents lower current operation. These measurements reflect different characterization protocols and do not indicate functional incompatibility. Both specifications are within normal ranges for silicon zener diodes and do not affect voltage regulation performance in typical applications.

Q: Is the DO-35 package compatible across all substitute parts?

A: Yes. All parts listed—BZX79C13, BZX79C13-T50A, BZX79-C13,113, BZX79-C13,133, and BZX79-C13,143—are specified with DO-204AH, DO-35, and Axial package designations. Physical form factor and pin configuration are identical, permitting direct board-level substitution without layout modification.

Q: Why is BZX79C13 classified as obsolete?

A: Product status reflects manufacturer discontinuation decisions. BZX79C13-T50A, manufactured by the same company (onsemi), provides active product status with equivalent specifications and is the recommended substitute for new designs and ongoing production.

Q: Can I use BZX79-C13,113, BZX79-C13,133, or BZX79-C13,143 in a 500 mW application?

A: No. These NXP parts are rated for 400 mW maximum power dissipation. Operation at 500 mW would exceed component ratings and create reliability risk. Applications requiring 500 mW dissipation must use BZX79C13-T50A or equivalent 500 mW rated zener diodes.

Q: What is the inventory status of available substitutes?

A: BZX79C13-T50A (onsemi) has 9,926 pieces in stock. NXP alternatives have substantial inventory: BZX79-C13,113 (176,564 pieces), BZX79-C13,133 (171,068 pieces), and BZX79-C13,143 (376,811 pieces). Original BZX79C13 has 983 pieces remaining as obsolete stock.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message