BZX79-B3V3,133 Equivalent & Substitute Parts

Part Overview

The BZX79-B3V3,133 is an active-status Zener diode manufactured by Nexperia USA Inc., rated for 3.3 V nominal voltage and 400 mW maximum power dissipation. 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 ROHS3 compliant and carries unlimited moisture sensitivity classification (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are required for circuit design continuity, inventory management, or supply chain optimization. Substitutes maintain identical functional specifications while potentially differing in manufacturing lot codes or supplier inventory availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±2%	—
Power - Max	400	mW
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 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	—
Supplier Device Package	ALF2	—
RoHS Status	ROHS3 Compliant	—
MSL	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BZX79-B3V3,133 are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitutability:

Critical Matching Parameters:

Zener voltage (Nom): 3.3 V
Power rating: 400 mW
Voltage tolerance: ±2%
Impedance (Max): 95 Ohms
Reverse leakage current: 5 µA @ 1 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -65°C to 200°C
Package type: DO-204AH (DO-35) Axial
Supplier device package: ALF2

All substitute parts listed maintain these exact specifications. Substitution is valid when all electrical characteristics and mechanical form factors are identical. The BZX79-B3V3,143 is classified as a parametric equivalent based on complete parameter alignment.

Parameter Comparison

Parameter	BZX79-B3V3,133	BZX79-B3V3,143	Match
Voltage - Zener (Nom)	3.3 V	3.3 V	✓
Tolerance	±2%	±2%	✓
Power - Max	400 mW	400 mW	✓
Impedance (Max)	95 Ohms	95 Ohms	✓
Current - Reverse Leakage @ Vr	5 µA @ 1 V	5 µA @ 1 V	✓
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	✓
Operating Temperature Range	-65°C to 200°C	-65°C to 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	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
MSL	1 (Unlimited)	1 (Unlimited)	✓
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	✓
Category	Diodes, Zener	Diodes, Zener	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

Both the BZX79-B3V3,133 and BZX79-B3V3,143 are active-status products manufactured by Nexperia USA Inc. and carry identical electrical and mechanical specifications. Selection between these parts is based on availability and supply chain considerations rather than functional differences.

Compliance Status:

Both parts are ROHS3 compliant
Both carry REACH Unaffected status
Both are classified under ECCN EAR99
Both share identical HTSUS code: 8541.10.0050
Both maintain MSL 1 (Unlimited) moisture sensitivity classification

The BZX79-B3V3,143 currently maintains higher inventory availability (5662 pcs) compared to the BZX79-B3V3,133 (2027 pcs). Component selection should prioritize supply chain continuity and lead-time requirements while maintaining full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Are BZX79-B3V3,133 and BZX79-B3V3,143 electrically interchangeable?

A: Yes. Both parts are rated for 3.3 V nominal Zener voltage with ±2% tolerance, 400 mW maximum power dissipation, 95 Ohms maximum impedance, and identical forward and reverse leakage characteristics. They operate across the same temperature range (-65°C to 200°C) and are functionally equivalent in circuit applications.

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

A: Yes. Both parts use the DO-204AH (DO-35) axial package with ALF2 supplier device package designation. Pin configuration and mechanical form factor are identical, allowing direct substitution without PCB layout modifications.

Q: What is the difference between the two part numbers?

A: The part numbers differ only in their manufacturing lot code suffix (,133 versus ,143). All electrical specifications, mechanical characteristics, compliance certifications, and functional performance are identical. The difference reflects manufacturing traceability and inventory tracking only.

Q: Are both parts RoHS compliant?

A: Yes. Both BZX79-B3V3,133 and BZX79-B3V3,143 are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection should be based on current inventory availability and supply chain lead times. Both parts carry active product status and identical specifications, ensuring long-term design stability and component availability.

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

A: Both parts carry MSL 1 (Unlimited) classification, indicating unlimited shelf life under standard storage conditions without special moisture control requirements.

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