BZX79-B68,133 Equivalent & Substitute Parts

Part Overview

The BZX79-B68,133 is a Zener diode rated at 68 V nominal voltage with 400 mW maximum power dissipation, manufactured by Nexperia USA Inc. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in DO-204AH (DO-35) axial configuration. The part is currently Active in product status and maintains full RoHS3 compliance. Substitute parts are identified when packaging format differs while all critical electrical parameters remain identical, enabling component sourcing flexibility across supply chain variations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	68	V
Tolerance	±2%	—
Power - Max	400	mW
Impedance (Max)	240	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 47.6 V
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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BZX79-B68,133 is determined by electrical parameter equivalence across the Zener diode category. The critical parameters establishing substitution eligibility are:

Voltage - Zener (Nom): 68 V
Tolerance: ±2%
Power - Max: 400 mW
Impedance (Max): 240 Ohms
Current - Reverse Leakage @ Vr: 50 nA @ 47.6 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
Operating Temperature Range: -65°C to 200°C
Mounting Type: Through Hole
Package / Case: DO-204AH, DO-35, Axial

The BZX79-B68,133 and its identified substitute differ only in supplier device packaging format (Tape & Box versus Cut Tape), while maintaining identical electrical specifications and compliance certifications. Both parts share the same base product number (BZX79-B68) and are manufactured by Nexperia USA Inc.

Parameter Comparison

Parameter	BZX79-B68,133	BZX79-B68,143	Match
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	✓
Category	Diodes, Zener	Diodes, Zener	✓
Voltage - Zener (Nom)	68 V	68 V	✓
Tolerance	±2%	±2%	✓
Power - Max	400 mW	400 mW	✓
Impedance (Max)	240 Ohms	240 Ohms	✓
Current - Reverse Leakage @ Vr	50 nA @ 47.6 V	50 nA @ 47.6 V	✓
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	✓
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	✓
Supplier Device Package	ALF2	ALF2	✓
Product Status	Active	Active	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓
Packaging Format	Tape & Box (TB)	Cut Tape (CT)	—

Engineering Selection Recommendations

Both the BZX79-B68,133 and BZX79-B68,143 are Active products manufactured by Nexperia USA Inc. with identical electrical specifications and compliance certifications. Selection between these parts is determined by packaging and supply chain requirements rather than functional performance.

The BZX79-B68,133 is supplied in Tape & Box (TB) format, suitable for applications requiring bulk component quantities with protective packaging. The BZX79-B68,143 is supplied in Cut Tape (CT) format, appropriate for automated assembly processes and component feeders.

Both parts maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited), confirming suitability for standard manufacturing environments without special handling protocols. Component selection should be based on assembly methodology, inventory management practices, and supply availability rather than electrical performance considerations.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B68,143 be used as a direct replacement for BZX79-B68,133?

A: Yes. Both parts are electrically identical with matching voltage ratings (68 V nominal), power dissipation (400 mW), impedance (240 Ohms maximum), and operating temperature range (-65°C to 200°C). The only difference is packaging format: Tape & Box versus Cut Tape. Functional performance in circuit applications is identical.

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

A: Tape & Box packaging supplies components on continuous tape wound in a box, typically used for manual assembly or bulk storage. Cut Tape packaging supplies components on tape segments, optimized for automated pick-and-place assembly equipment. Both formats contain identical components with no electrical differences.

Q: Are both parts RoHS compliant?

A: Yes. Both BZX79-B68,133 and BZX79-B68,143 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the Moisture Sensitivity Level for these parts?

A: Both parts have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard storage and handling procedures are sufficient without specialized desiccant packaging or controlled humidity environments.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts share identical electrical parameters, operating temperature range, and through-hole mounting configuration. PCB design, circuit layout, and component footprints require no modification when substituting between these part numbers.

Q: Which part should be selected for high-volume automated assembly?

A: The BZX79-B68,143 (Cut Tape format) is optimized for automated pick-and-place assembly systems. The BZX79-B68,133 (Tape & Box format) is suitable for manual assembly or bulk component storage applications.

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