BZX84C30-7-F-79 Equivalent & Substitute Parts

Part Overview

The BZX84C30-7-F-79 is a 30 V, 300 mW Zener diode manufactured by Diodes Incorporated in SOT-23-3 surface mount packaging. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement.

The BZX84C30-7-F-79 operates across a temperature range of -65°C to 150°C and maintains a reverse leakage current of 100 nA at 21 V. The device is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is suitable for general-purpose voltage regulation and protection applications in surface mount assemblies.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	30	V
Power - Maximum	300	mW
Tolerance	±6.67%	%
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 21 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX84C30-7-F-79 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - Zener (Nominal): 30 V
Power - Maximum: 300 mW
Impedance (Maximum): 80 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 21 V
Voltage - Forward (Maximum) @ If: 900 mV @ 10 mA
Operating Temperature Range: -65°C to 150°C
Package / Case: SOT-23-3
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Variation Parameter:

Tolerance: Ranges from ±2% to ±7% across substitute parts. All values remain within acceptable zener voltage regulation specifications.

All identified substitute parts maintain identical electrical performance across primary parameters. Tolerance variations reflect manufacturing grade differences and do not affect functional interchangeability in standard voltage regulation applications. Packaging format variations (Cut Tape, Tape & Reel, Digi-Reel) represent distribution methods only and do not impact electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status
BZX84C30-7-F-79	Diodes Incorporated	30 V	±6.67%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Obsolete
BZX84C30-7-F	Diodes Incorporated	30 V	±7%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
BZX84B30Q-7-F	Diodes Incorporated	30 V	±2%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
BZX84C30Q-13-F	Diodes Incorporated	30 V	±6.67%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
BZX84C30Q-7-F	Diodes Incorporated	30 V	±6.67%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
BZX84C30	Taiwan Semiconductor Corporation	30 V	±6.67%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
BZX84C30 RFG	Taiwan Semiconductor Corporation	30 V	±5%	300 mW	80 Ω	100 nA @ 21 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation: BZX84C30-7-F (Diodes Incorporated)

The BZX84C30-7-F is the direct active equivalent to the obsolete BZX84C30-7-F-79. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications with only a ±7% tolerance versus the original ±6.67%. This part maintains ROHS3 compliance and unlimited MSL rating. Inventory availability is 21,200 units. This part is suitable for immediate substitution in all applications previously using the BZX84C30-7-F-79.

Secondary Recommendation: BZX84B30Q-7-F (Diodes Incorporated)

The BZX84B30Q-7-F offers tighter tolerance performance at ±2% and includes AEC-Q101 automotive qualification. This part is classified as automotive grade and is suitable for applications requiring enhanced voltage regulation precision. Inventory availability is 2,355 units. This part is appropriate for designs where improved tolerance performance is beneficial.

Alternative Recommendation: BZX84C30Q-7-F (Diodes Incorporated)

The BZX84C30Q-7-F maintains identical electrical specifications to the original part with ±6.67% tolerance and includes AEC-Q101 automotive qualification. Inventory availability is 628 units. This part is suitable for automotive and high-reliability applications.

Cross-Manufacturer Alternative: BZX84C30 (Taiwan Semiconductor Corporation)

The BZX84C30 from Taiwan Semiconductor Corporation provides equivalent electrical performance with ±6.67% tolerance. Inventory availability is 29,300 units. This part is suitable for applications where cross-manufacturer sourcing is acceptable. The BZX84C30 RFG variant offers ±5% tolerance with 7,174 units in stock.

All substitute parts maintain ROHS3 compliance and are suitable for surface mount assembly in SOT-23-3 packaging. Selection should be based on tolerance requirements, automotive qualification needs, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can BZX84C30-7-F directly replace BZX84C30-7-F-79?

A: Yes. The BZX84C30-7-F is the active equivalent. Both parts share identical electrical specifications including 30 V nominal zener voltage, 300 mW maximum power dissipation, 80 Ohm maximum impedance, and SOT-23-3 packaging. The tolerance specification differs slightly (±7% versus ±6.67%), which does not affect functional interchangeability in standard voltage regulation circuits.

Q: What is the difference between Diodes Incorporated and Taiwan Semiconductor Corporation versions?

A: Both manufacturers produce parts meeting identical electrical specifications for the 30 V, 300 mW zener diode in SOT-23-3 packaging. The primary differences are manufacturing source and tolerance grades. Diodes Incorporated parts include automotive-qualified variants (BZX84B30Q-7-F, BZX84C30Q-7-F, BZX84C30Q-13-F) with AEC-Q101 certification. Taiwan Semiconductor Corporation parts (BZX84C30, BZX84C30 RFG) are available in standard and refined tolerance grades. All parts maintain ROHS3 compliance.

Q: What does the tolerance specification mean for substitution?

A: Tolerance indicates the allowable deviation from the nominal 30 V zener voltage. The BZX84C30-7-F-79 specifies ±6.67% tolerance, meaning the actual zener voltage can range from 27.99 V to 32.01 V. Substitute parts with ±7%, ±6.67%, ±5%, or ±2% tolerance all maintain the same nominal 30 V specification and are functionally equivalent. Tighter tolerance parts (±2%, ±5%) provide improved voltage regulation precision if required by the application.

Q: Are automotive-qualified parts (AEC-Q101) necessary for my application?

A: AEC-Q101 qualification is required only for automotive applications or designs requiring automotive-grade reliability standards. The BZX84B30Q-7-F, BZX84C30Q-7-F, and BZX84C30Q-13-F include AEC-Q101 certification. For general-purpose industrial and consumer applications, non-automotive qualified parts such as BZX84C30-7-F are appropriate.

Q: What is the difference between Cut Tape, Tape & Reel, and Digi-Reel packaging formats?

A: These designations describe the distribution and delivery format only and do not affect electrical or mechanical compatibility. Cut Tape (CT) and Digi-Reel are suitable for lower-volume orders and manual assembly. Tape & Reel (TR) format is standard for high-volume automated assembly. All formats deliver the same SOT-23-3 component in identical packaging.

Q: Can I use BZX84C30 RFG with ±5% tolerance instead of the original ±6.67%?

A: Yes. The BZX84C30 RFG maintains all electrical specifications identical to the original part and provides improved tolerance performance at ±5%. This part is suitable for direct substitution and offers enhanced voltage regulation precision. The tighter tolerance does not introduce any compatibility issues.

Q: What inventory considerations should I account for when selecting a substitute?

A: Inventory availability varies significantly across substitute parts. BZX84C30-7-F (Diodes Incorporated) has 21,200 units in stock, providing reliable long-term availability. BZX84C30 (Taiwan Semiconductor Corporation) has 29,300 units available. Automotive-qualified variants have lower inventory: BZX84B30Q-7-F (2,355 units), BZX84C30Q-7-F (628 units), and BZX84C30Q-13-F (1,057 units). Selection should account for both immediate procurement needs and long-term supply chain requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance and are suitable for applications requiring RoHS compliance. Moisture sensitivity level (MSL) is rated as 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

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