BZX79C36 Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX79C36 is a 36 V, 500 mW Zener diode manufactured by onsemi in a through-hole DO-35 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The BZX79C36 functions as a voltage regulation and transient protection element in electronic circuits requiring 36 V reference voltage stabilization.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	36 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	90 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 25.2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA
Operating Temperature Range	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZX79C36 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 36 V nominal
Tolerance: ±5%
Operating temperature range: -65°C ~ 200°C
Mounting type: Through Hole
Package type: DO-35 or equivalent axial configuration
Impedance (Max): 90 Ohms

Substitution Categories:

Direct Parametric Equivalents maintain all electrical specifications including 500 mW power rating and identical forward voltage characteristics.

Functional Equivalents provide the same 36 V zener voltage and tolerance with reduced maximum power dissipation (400 mW) and modified forward voltage characteristics. These parts are suitable for applications where the full 500 mW power rating is not required and forward voltage differences are acceptable within circuit design margins.

All substitute parts maintain identical zener voltage, tolerance, impedance, reverse leakage current, operating temperature range, and through-hole mounting configuration as the primary part.

Parameter Comparison

Parameter	BZX79C36 (onsemi)	BZX79C36-T50A (Fairchild)	BZX79-C36,113 (NXP)	BZX79-C36,133 (Nexperia)	BZX79-C36,143 (Nexperia)
Voltage - Zener (Nom)	36 V	36 V	36 V	36 V	36 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	400 mW	400 mW	400 mW
Impedance (Max)	90 Ohms	90 Ohms	90 Ohms	90 Ohms	90 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 25.2 V	50 nA @ 25.2 V	50 nA @ 25.2 V	50 nA @ 25.2 V	50 nA @ 25.2 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 ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 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
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The BZX79C36-T50A (Fairchild Semiconductor) provides complete parametric equivalence to the BZX79C36. This part maintains the 500 mW power rating, identical forward voltage characteristics (1.5 V @ 100 mA), and all other electrical specifications. However, both the original part and this equivalent are classified as obsolete, limiting long-term availability.

For Active Production Designs (Recommended):

The NXP Semiconductors BZX79-C36,113, Nexperia USA Inc. BZX79-C36,133, and Nexperia USA Inc. BZX79-C36,143 are active product status alternatives. These parts maintain the critical 36 V zener voltage, ±5% tolerance, 90 Ohm impedance, and identical operating temperature range. The primary difference is reduced maximum power dissipation (400 mW versus 500 mW) and modified forward voltage characteristics (900 mV @ 10 mA versus 1.5 V @ 100 mA).

The Nexperia parts BZX79-C36,133 and BZX79-C36,143 carry ROHS3 compliance certification, supporting regulatory requirements for new designs. These parts are available in multiple packaging formats (Tape & Box and Cut Tape) with substantial inventory levels.

Selection Criteria:

If 500 mW power dissipation is mandatory, use BZX79C36-T50A
If active product status and regulatory compliance are required, use BZX79-C36,133 or BZX79-C36,143
If 400 mW power rating is acceptable for the application, all Nexperia variants are suitable
Verify forward voltage operating point compatibility when transitioning from 1.5 V @ 100 mA to 900 mV @ 10 mA specifications

Frequently Asked Questions (FAQ)

Q: Can BZX79-C36,113, BZX79-C36,133, and BZX79-C36,143 be used interchangeably with the BZX79C36?

A: These parts share identical zener voltage (36 V), tolerance (±5%), impedance (90 Ohms), reverse leakage current, and operating temperature range. The primary difference is maximum power dissipation (400 mW versus 500 mW). Interchangeability depends on circuit power requirements. If the circuit dissipates less than 400 mW in the zener diode, these parts are functionally compatible. The modified forward voltage specification (900 mV @ 10 mA versus 1.5 V @ 100 mA) must be evaluated within the specific circuit application.

Q: What is the difference between BZX79-C36,113, BZX79-C36,133, and BZX79-C36,143?

A: These three parts are electrically identical. The differences are packaging format and supplier designation. BZX79-C36,113 is supplied in Bulk packaging, BZX79-C36,133 in Tape & Box format, and BZX79-C36,143 in Cut Tape format. Selection depends on procurement and assembly requirements.

Q: Why do the Nexperia parts have lower power ratings (400 mW) compared to the original BZX79C36 (500 mW)?

A: The Nexperia BZX79-C36 series is a different product line variant within the same base part number family. The 400 mW rating reflects the thermal and design characteristics of this specific variant. Both ratings are valid for 36 V zener diodes; selection depends on application power requirements.

Q: Are the Nexperia parts RoHS compliant?

A: Yes, BZX79-C36,133 and BZX79-C36,143 are ROHS3 compliant. This certification supports regulatory requirements for products sold in regions with RoHS directives.

Q: What is the difference between the forward voltage specifications?

A: The original BZX79C36 specifies 1.5 V @ 100 mA forward voltage, while the Nexperia variants specify 900 mV @ 10 mA. These measurements are taken at different current levels. The lower voltage at lower current is typical for diode characteristics. Circuit designers must verify that the forward voltage operating point of their application aligns with one of these specifications or falls within acceptable operating margins.

Q: Can I use BZX79C36-T50A as a substitute?

A: Yes, BZX79C36-T50A provides complete parametric equivalence including the 500 mW power rating. However, this part is obsolete, which may limit future availability and procurement options.

Q: What is the moisture sensitivity level for these parts?

A: All listed parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited moisture sensitivity. These components do not require special moisture control during storage or handling.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message