BZX84C18 Equivalent & Substitute Parts

Part Overview

The BZX84C18 is a small-signal zener diode manufactured by Taiwan Semiconductor Corporation, rated for 18 V nominal zener voltage with 300 mW maximum power dissipation. The device is packaged in SOT-23 surface mount configuration and is classified as Active product status. This part is widely used in voltage regulation and protection circuits requiring stable reference voltages in compact form factors. Substitute parts are identified based on matching electrical specifications, package compatibility, and manufacturing certifications to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Power - Max	300	mW
Tolerance	±6.39%	—
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 12.6 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BZX84C18 are qualified based on the following critical parameters that determine functional equivalence:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 18 V (exact match required)
Power - Max: 300 mW (exact match required)
Impedance (Max): 45 Ohms (exact match required)
Current - Reverse Leakage @ Vr: 100 nA @ 12.6 V (exact match required)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (exact match required)
Operating Temperature Range: -65°C to 150°C (exact match required)

Mechanical Equivalence Criteria:

Package / Case: TO-236-3, SC-59, SOT-23-3 (exact match required)
Mounting Type: Surface Mount (exact match required)

Compliance Criteria:

RoHS Status: ROHS3 Compliant (required)
REACH Status: REACH Unaffected (required)

All substitute parts listed maintain identical electrical performance and physical compatibility with the BZX84C18. Variations in tolerance specification and packaging format (Tape & Reel versus standard packaging) do not affect functional substitution capability.

Parameter Comparison

Parameter	BZX84C18	BZX84C18 RFG	BZX84B18Q-7-F	BZX84C18Q-13-F	BZX84C18Q-7-F
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Voltage - Zener (Nom)	18 V	18 V	18 V	18 V	18 V
Tolerance	±6.39%	±5%	±2%	±6.39%	±6.39%
Power - Max	300 mW	300 mW	300 mW	300 mW	300 mW
Impedance (Max)	45 Ohms	45 Ohms	45 Ohms	45 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12.6 V	100 nA @ 12.6 V	100 nA @ 12.6 V	100 nA @ 12.6 V	100 nA @ 12.6 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Grade	—	—	Automotive	Automotive	Automotive
Qualification	—	—	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the BZX84C18 and are suitable for direct replacement in circuit applications.

BZX84C18 RFG (Taiwan Semiconductor Corporation): This part is manufactured by the same supplier as the main part and offers improved tolerance specification (±5% versus ±6.39%). It is packaged in Tape & Reel format and carries ROHS3 compliance with MSL rating of 1 (Unlimited). This substitute is appropriate for applications where tighter voltage tolerance is beneficial.

BZX84B18Q-7-F (Diodes Incorporated): This part features the tightest tolerance specification (±2%) among all substitutes and carries Automotive grade qualification with AEC-Q101 certification. It is packaged in Tape & Reel format with MSL rating of 1 (Unlimited). This substitute is appropriate for automotive applications and circuits requiring enhanced voltage accuracy.

BZX84C18Q-13-F (Diodes Incorporated): This part maintains the same tolerance specification as the main part (±6.39%) and carries Automotive grade qualification with AEC-Q101 certification. It is packaged in Tape & Reel format with MSL rating of 1 (Unlimited). This substitute is appropriate for automotive applications requiring equivalent performance characteristics.

BZX84C18Q-7-F (Diodes Incorporated): This part maintains the same tolerance specification as the main part (±6.39%) and carries Automotive grade qualification with AEC-Q101 certification. It is packaged in Tape & Reel format with MSL rating of 1 (Unlimited). This substitute offers the highest inventory availability among all alternatives and is appropriate for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can BZX84C18 be directly replaced with BZX84C18 RFG?

A: Yes. Both parts share identical electrical specifications (18 V nominal zener voltage, 300 mW power rating, 45 Ohms impedance, 100 nA reverse leakage, 900 mV forward voltage) and identical package configuration (SOT-23). The primary difference is packaging format (Tape & Reel) and improved tolerance (±5% versus ±6.39%). Direct substitution is supported.

Q: What is the difference between BZX84C18Q-7-F and BZX84C18Q-13-F?

A: Both parts are manufactured by Diodes Incorporated and share identical electrical specifications and package configuration. The designation suffix (-7-F versus -13-F) indicates different tape reel configurations and quantity per reel. Electrically and mechanically, these parts are equivalent and interchangeable.

Q: Is BZX84B18Q-7-F suitable for non-automotive applications?

A: Yes. BZX84B18Q-7-F meets all electrical and mechanical requirements for the BZX84C18 and is suitable for any application requiring an 18 V, 300 mW zener diode in SOT-23 package. The Automotive grade and AEC-Q101 qualification indicate enhanced quality and reliability standards that benefit all applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the compliance status of the main part BZX84C18.

Q: What does MSL rating 1 (Unlimited) indicate?

A: MSL (Moisture Sensitivity Level) rating of 1 (Unlimited) indicates that the component has unlimited shelf life under normal storage conditions and does not require special moisture control measures during handling and storage.

Q: Can substitute parts be mixed in the same production batch?

A: All substitute parts maintain identical electrical performance and package compatibility. However, component sourcing decisions should follow established procurement and quality assurance procedures specific to each application and manufacturing environment.

Q: Which substitute part offers the best voltage accuracy?

A: BZX84B18Q-7-F offers the tightest tolerance specification at ±2%, compared to ±6.39% for the main part and most other substitutes. BZX84C18 RFG offers intermediate tolerance at ±5%.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All substitute parts listed are supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message