BZX84W-C51-QF Equivalent & Substitute Parts

Part Overview

The BZX84W-C51-QF is a 51 V Zener diode manufactured by Nexperia USA Inc., rated for 275 mW maximum power dissipation in a surface mount SOT-323 package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility within specified tolerance ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	51	V
Power - Maximum	275	mW
Impedance (Maximum)	180	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 35.7 V	nA
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	mV
Operating Temperature (Junction)	150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of Zener diodes within the BZX84W series is determined by three critical parameters: nominal Zener voltage, maximum power rating, and package configuration. All identified substitute parts maintain the 51 V nominal Zener voltage and 275 mW power rating, ensuring functional equivalence in voltage regulation and protection applications. The SOT-323 package is consistent across all parts, confirming mechanical and thermal compatibility.

The primary differentiator among substitute parts is the tolerance specification on Zener voltage. The BZX84W-C51-QF main part carries ±5.88% tolerance. Substitute parts are grouped into two tolerance classes:

Tighter Tolerance Group (±2%): BZX84W-B51F and BZX84W-B51X offer improved voltage accuracy with ±2% tolerance, suitable for applications requiring stricter voltage regulation.

Equivalent Tolerance Group (±5%): BZX84W-C51F and BZX84W-C51X maintain ±5% tolerance, directly comparable to the main part's tolerance specification.

All substitute parts share identical electrical characteristics including reverse leakage current, forward voltage drop, impedance, and operating temperature range. Packaging format (Tape & Reel) and compliance certifications (ROHS3, REACH Unaffected, EAR99) are uniform across all parts.

Parameter Comparison

Parameter	BZX84W-C51-QF (Main)	BZX84W-B51F	BZX84W-B51X	BZX84W-C51F	BZX84W-C51X
Voltage - Zener (Nom)	51 V	51 V	51 V	51 V	51 V
Tolerance	±5.88%	±2%	±2%	±5%	±5%
Power - Max	275 mW	275 mW	275 mW	275 mW	275 mW
Impedance (Max)	180 Ohms	180 Ohms	180 Ohms	180 Ohms	180 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 35.7 V	50 nA @ 35.7 V	50 nA @ 35.7 V	50 nA @ 35.7 V	50 nA @ 35.7 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts are manufactured by Nexperia USA Inc. and maintain active product status. Selection among equivalent parts is based on tolerance requirements and inventory availability.

For applications requiring tighter voltage accuracy: BZX84W-B51F and BZX84W-B51X are suitable substitutes, offering ±2% tolerance compared to the main part's ±5.88% tolerance. These parts provide improved voltage regulation performance in precision circuits. BZX84W-B51X has higher inventory availability (664 pcs) compared to BZX84W-B51F (1012 pcs).

For applications with tolerance specifications matching the main part: BZX84W-C51F and BZX84W-C51X are direct functional equivalents with ±5% tolerance. BZX84W-C51X offers the highest inventory level (4026 pcs) among all substitute options, providing supply chain flexibility.

All substitute parts carry AEC-Q101 automotive qualification compliance and ROHS3 environmental certification, maintaining regulatory and quality standards equivalent to the main part. The SOT-323 package configuration is identical across all parts, ensuring PCB layout and thermal management compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can BZX84W-B51F or BZX84W-B51X be used as direct replacements for BZX84W-C51-QF?

A: Yes. These parts are functionally equivalent with identical nominal Zener voltage (51 V), power rating (275 mW), impedance (180 Ohms), and package configuration (SOT-323). The ±2% tolerance specification of the B-series parts is tighter than the main part's ±5.88% tolerance, making them suitable for applications where improved voltage accuracy is beneficial or required.

Q: What is the difference between BZX84W-C51F and BZX84W-C51X?

A: Both parts are electrically identical with ±5% Zener voltage tolerance. The difference is in packaging format designation and inventory availability. BZX84W-C51X has significantly higher stock (4026 pcs) compared to BZX84W-C51F (967 pcs). Both are supplied in Tape & Reel format and are suitable for automated assembly.

Q: Are all substitute parts qualified for automotive applications?

A: The main part BZX84W-C51-QF carries AEC-Q101 automotive qualification. The substitute parts BZX84W-B51F, BZX84W-B51X, BZX84W-C51F, and BZX84W-C51X are manufactured to the same specifications and compliance standards. Confirmation of automotive qualification status for each substitute part should be verified through the manufacturer's current datasheet if automotive certification is a design requirement.

Q: Can these Zener diodes be used interchangeably in the same PCB layout?

A: Yes. All parts use the identical SOT-323 package configuration with the same pin assignment and thermal characteristics. No PCB layout modification is required for substitution. Soldering parameters and reflow profiles remain unchanged.

Q: What is the significance of the tolerance specification in Zener diode selection?

A: Zener voltage tolerance determines the voltage regulation accuracy in the circuit. The main part BZX84W-C51-QF with ±5.88% tolerance produces a Zener voltage range of approximately 48.0 V to 54.0 V. The B-series substitutes with ±2% tolerance produce a range of approximately 49.98 V to 52.02 V, providing tighter voltage control. Selection depends on the application's voltage regulation requirements.

Q: Are moisture sensitivity levels specified for all parts?

A: The main part BZX84W-C51-QF does not specify a Moisture Sensitivity Level (MSL) in the provided data. All substitute parts (BZX84W-B51F, BZX84W-B51X, BZX84W-C51F, BZX84W-C51X) are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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