BZX79-C33,113 Equivalent & Substitute Parts

Part Overview

The BZX79-C33,113 is a through-hole Zener diode manufactured by Nexperia USA Inc., rated at 33 V nominal Zener voltage with 400 mW maximum power dissipation. The device is packaged in DO-204AH (DO-35) axial configuration and supplied in Cut Tape (CT) format. This component is classified as Active product status and maintains full ROHS3 compliance with REACH Unaffected designation. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, packaging format preferences, or tolerance specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Power - Max	400	mW
Tolerance	±5%	—
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 700 mV	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Supplier Device Package	ALF2	—

Substitute Part Grouping Explanation

Substitution of the BZX79-C33,113 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Nom): 33 V (exact match required)
Power rating: 400 mW (exact match required)
Impedance (Max): 80 Ohms (exact match required)
Forward voltage: 900 mV @ 10 mA (exact match required)
Operating temperature range: -65°C to 200°C (exact match required)

Mechanical Compatibility Criteria:

Mounting type: Through Hole (exact match required)
Package / Case: DO-204AH, DO-35, Axial (exact match required)
Supplier device package: ALF2 (exact match required)

Tolerance Variance: The BZX79-C33,113 operates at ±5% tolerance. Substitute parts with ±2% tolerance (BZX79-B33 series) provide tighter voltage regulation and are electrically compatible for applications requiring improved accuracy. Parts with identical ±5% tolerance maintain the original specification.

Packaging Format Variance: Substitute parts are available in Cut Tape (CT) and Tape & Reel (TR) formats. Both formats contain identical components; selection depends on assembly process requirements and inventory management.

Parameter Comparison

Parameter	BZX79-C33,113	BZX79-B33,113	BZX79-B33,133	BZX79-C33,133
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom)	33 V	33 V	33 V	33 V
Tolerance	±5%	±2%	±2%	±5%
Power - Max	400 mW	400 mW	400 mW	400 mW
Impedance (Max)	80 Ohms	80 Ohms	80 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 700 mV	50 nA @ 23.1 V	50 nA @ 23.1 V	50 nA @ 700 mV
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 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
Mounting Type	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
Supplier Device Package	ALF2	ALF2	ALF2	ALF2
Packaging Format	Cut Tape (CT)	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full regulatory compliance (ROHS3 Compliant, REACH Unaffected). Selection between substitute options is based on the following criteria:

BZX79-B33,113 (Tape & Reel Format): Select this part when Tape & Reel packaging is required for automated assembly processes. The ±2% tolerance provides improved voltage regulation compared to the original ±5% specification. Electrical and mechanical parameters are fully equivalent.

BZX79-B33,133 (Cut Tape Format, ±2% Tolerance): Select this part when Cut Tape packaging is required and improved voltage tolerance is beneficial. The ±2% tolerance specification provides tighter Zener voltage control. Electrical and mechanical parameters are fully equivalent to the main part except for tolerance.

BZX79-C33,133 (Cut Tape Format, ±5% Tolerance): Select this part as a direct equivalent when Cut Tape packaging is required and the original ±5% tolerance specification is maintained. All electrical and mechanical parameters are identical to the BZX79-C33,113.

All substitute parts are manufactured by Nexperia USA Inc. and share identical core electrical characteristics: 33 V Zener voltage, 400 mW power rating, 80 Ohms maximum impedance, and DO-35 axial through-hole packaging.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B33 series parts (±2% tolerance) replace BZX79-C33,113 (±5% tolerance)?

A: Yes. The BZX79-B33 series provides tighter voltage tolerance and is electrically compatible. The ±2% tolerance is a superior specification that operates within the application requirements of the original ±5% part. All other electrical parameters are identical.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are packaging formats for the same component. Cut Tape is supplied in smaller quantities on tape, suitable for manual or small-scale assembly. Tape & Reel is supplied on continuous reels for high-volume automated assembly. The diode itself is identical; only the delivery format differs.

Q: Are all substitute parts pin-compatible with the original BZX79-C33,113?

A: Yes. All substitute parts use the DO-35 axial package with identical pin configuration and lead spacing. Direct board-level substitution is possible without layout modifications.

Q: Do the substitute parts meet the same regulatory requirements?

A: Yes. All substitute parts are ROHS3 Compliant and REACH Unaffected, matching the original part's regulatory status.

Q: What is the significance of the reverse leakage current specification difference?

A: The BZX79-C33,113 and BZX79-C33,133 specify reverse leakage at 700 mV, while BZX79-B33 series parts specify it at 23.1 V. Both measurements characterize the same leakage behavior at different test voltages. The 50 nA leakage value is equivalent across all parts.

Q: Can I use BZX79-C33,133 as a direct replacement for BZX79-C33,113?

A: Yes. The BZX79-C33,133 is a direct equivalent with identical electrical specifications, tolerance, and packaging format. The only difference is the supplier device package designation (133 vs. 113), which reflects internal manufacturing or supplier coding and does not affect component performance or compatibility.

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