BZX84C18-7-F-79 Equivalent & Substitute Parts

Part Overview

The BZX84C18-7-F-79 is a Zener diode rated at 18 V nominal with 300 mW power dissipation in a surface mount SOT-23-3 package. Manufactured by Diodes Incorporated, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing design support, production continuity, and new project implementations. The substitute parts listed maintain the core electrical specifications while offering improved availability and active manufacturer support.

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
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX84C18-7-F-79 is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 18 V (exact match required)
Power - Max: 300 mW (exact match required)
Package / Case: SOT-23-3 or TO-236-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Operating Temperature Range: -65°C to 150°C (functional range)

Secondary Substitution Criteria:

Tolerance: ±6.39% or tighter (±6%, ±5%, ±2%)
Impedance (Max): 45 Ohms (electrical performance)
Current - Reverse Leakage @ Vr: 100 nA @ 12.6 V (leakage specification)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (forward bias performance)

All substitute parts maintain identical primary electrical specifications. Tolerance variations are acceptable as tighter tolerances provide improved performance. All substitute parts are active products with current manufacturer support and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom)	Power - Max	Tolerance	Impedance (Max)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Package	Product Status	Packaging Type
BZX84C18-7-F-79	Diodes Incorporated	18 V	300 mW	±6.39%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Obsolete	—
BZX84C18-7-F	Diodes Incorporated	18 V	300 mW	±6%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	Tape & Reel (TR)
BZX84B18Q-7-F	Diodes Incorporated	18 V	300 mW	±2%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	Tape & Reel (TR)
BZX84C18Q-13-F	Diodes Incorporated	18 V	300 mW	±6.39%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	Tape & Reel (TR)
BZX84C18Q-7-F	Diodes Incorporated	18 V	300 mW	±6.39%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	Tape & Reel (TR)
BZX84C18	Taiwan Semiconductor Corporation	18 V	300 mW	±6.39%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	—
BZX84C18 RFG	Taiwan Semiconductor Corporation	18 V	300 mW	±5%	45 Ohms	100 nA @ 12.6 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: BZX84C18-7-F (Diodes Incorporated)

The BZX84C18-7-F is the direct active equivalent of the obsolete BZX84C18-7-F-79. This part maintains identical electrical specifications with a tighter tolerance (±6% versus ±6.39%), is manufactured by the same supplier, carries AEC-Q101 automotive qualification, and is available in high volume (104,300 pcs in stock). This part is suitable for all applications previously using the BZX84C18-7-F-79.

Secondary Recommendation: BZX84B18Q-7-F (Diodes Incorporated)

The BZX84B18Q-7-F offers superior tolerance performance at ±2%, providing tighter voltage regulation. This part is qualified to AEC-Q101 automotive standards and is recommended for applications requiring enhanced voltage accuracy. Inventory availability is lower (1,865 pcs) compared to the primary recommendation.

Alternative Recommendations: BZX84C18Q-7-F and BZX84C18Q-13-F (Diodes Incorporated)

Both BZX84C18Q-7-F and BZX84C18Q-13-F maintain the original ±6.39% tolerance specification and are AEC-Q101 qualified. The BZX84C18Q-7-F offers higher inventory (65,400 pcs) and is suitable for high-volume production. The BZX84C18Q-13-F is available in 10K tape reels (959 pcs in stock).

Cross-Manufacturer Alternative: BZX84C18 and BZX84C18 RFG (Taiwan Semiconductor Corporation)

The BZX84C18 and BZX84C18 RFG from Taiwan Semiconductor Corporation provide functional equivalence with identical electrical specifications. The BZX84C18 RFG offers ±5% tolerance and is available in Tape & Reel packaging (6,641 pcs in stock). These parts are suitable for applications where cross-manufacturer sourcing is acceptable.

All substitute parts are RoHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original part.

Frequently Asked Questions (FAQ)

Q: Can BZX84C18-7-F directly replace BZX84C18-7-F-79 in existing designs?

A: Yes. The BZX84C18-7-F is electrically and mechanically compatible with the BZX84C18-7-F-79. Both parts share identical nominal voltage (18 V), power rating (300 mW), package type (SOT-23-3), and operating temperature range (-65°C to 150°C). The BZX84C18-7-F features a tighter tolerance (±6% versus ±6.39%), which provides improved performance.

Q: What is the difference between BZX84C18-7-F and BZX84B18Q-7-F?

A: The primary difference is tolerance specification. The BZX84C18-7-F maintains ±6% tolerance, while the BZX84B18Q-7-F provides tighter ±2% tolerance. Both parts are identical in voltage rating, power dissipation, impedance, leakage current, and forward voltage characteristics. The BZX84B18Q-7-F is recommended for applications requiring superior voltage regulation accuracy.

Q: Are the Diodes Incorporated parts AEC-Q101 qualified?

A: Yes. The BZX84C18-7-F, BZX84B18Q-7-F, BZX84C18Q-13-F, and BZX84C18Q-7-F are all AEC-Q101 qualified automotive-grade components. The original BZX84C18-7-F-79 does not carry this qualification designation.

Q: Can I use Taiwan Semiconductor Corporation parts as substitutes?

A: Yes. The BZX84C18 and BZX84C18 RFG from Taiwan Semiconductor Corporation are functionally equivalent to the BZX84C18-7-F-79. Both maintain the 18 V nominal voltage, 300 mW power rating, and SOT-23-3 package. The BZX84C18 RFG offers ±5% tolerance. Cross-manufacturer substitution is acceptable when supplier diversification is required.

Q: What packaging options are available for these substitute parts?

A: Most substitute parts are available in Tape & Reel (TR) packaging for automated assembly. The BZX84C18 from Taiwan Semiconductor Corporation is available without specified packaging designation. All parts use the SOT-23-3 surface mount package, ensuring compatibility with standard PCB assembly equipment.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (BZX84C18-7-F, BZX84B18Q-7-F, BZX84C18Q-13-F, BZX84C18Q-7-F, BZX84C18, and BZX84C18 RFG) are RoHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original BZX84C18-7-F-79.

Q: Which substitute part offers the best availability?

A: The BZX84C18-7-F from Diodes Incorporated offers the highest inventory level at 104,300 pcs in stock. This part is recommended for high-volume production requirements and provides the shortest lead times.

Q: Can I mix different substitute parts in the same design?

A: Yes. All substitute parts maintain identical electrical specifications for the core parameters (18 V nominal voltage, 300 mW power rating, 45 Ohms impedance, 100 nA reverse leakage, 900 mV forward voltage). Tolerance variations (±2%, ±5%, ±6%, ±6.39%) are acceptable within the same circuit design, though using a single part number is recommended for manufacturing consistency.

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