BZX84C4V7_D87Z Equivalent & Substitute Parts

Part Overview

The BZX84C4V7_D87Z is a 4.7 V Zener diode manufactured by onsemi, rated for 350 mW power dissipation in a surface mount SOT-23-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The BZX84C4V7_D87Z serves voltage regulation and protection functions in electronic circuits requiring precise 4.7 V reference voltage generation.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	4.7 V
Tolerance	±6%
Power - Max	350 mW
Impedance (Max) (Zzt)	80 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3

Substitute Part Grouping Explanation

Substitution of the BZX84C4V7_D87Z is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 4.7 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Impedance (Max): 80 Ohms
Current - Reverse Leakage @ Vr: 3 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA

Secondary Considerations:

Power rating: 350 mW (minimum acceptable)
Tolerance: ±6% (acceptable range)
Operating temperature range: -55°C ~ 150°C (minimum acceptable)

Substitute parts are grouped into three categories based on these parameters:

Direct Equivalents - Parts with identical electrical specifications and active product status
Functional Equivalents - Parts with matching core parameters but different power ratings or tolerance specifications
Automotive-Grade Alternatives - Parts with AEC-Q101 qualification for enhanced reliability requirements

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Ir @ Vr (µA @ V)	Vf Max @ If (mV @ mA)	Temp Range (°C)	Product Status
BZX84C4V7_D87Z	onsemi	4.7	±6%	350	80	3 @ 2	900 @ 10	-55 ~ 150	Obsolete
BZX84C4V7LT1G	onsemi	4.7	±6%	225	80	3 @ 2	900 @ 10	-65 ~ 150	Active
BZX84C4V7LT3G	onsemi	4.7	±6%	225	80	3 @ 2	900 @ 10	-65 ~ 150	Active
SZBZX84C4V7LT1G	onsemi	4.7	±6%	225	80	3 @ 2	900 @ 10	-65 ~ 150	Active
SZBZX84C4V7LT3G	onsemi	4.7	±6%	225	80	3 @ 2	900 @ 10	-65 ~ 150	Active
BZX84C4V7-7-F	Diodes Incorporated	4.7	±6%	300	80	3 @ 2	900 @ 10	-65 ~ 150	Active
BZX84-A4V7,215	Nexperia USA Inc.	4.7	±1%	250	80	3 @ 2	900 @ 10	-65 ~ 150	Active
BZX84-C4V7,215	NXP USA Inc.	4.7	±5%	250	80	3 @ 2	900 @ 10	-65 ~ 150	Active
BZX84-C4V7,235	Nexperia USA Inc.	4.7	±5%	250	80	3 @ 2	900 @ 10	-65 ~ 150	Active
BZX84B4V7-TP	Micro Commercial Co	4.7	±2%	350	80	3 @ 2	900 @ 10	-55 ~ 150	Active
MMBZ5230B-7-F	Diodes Incorporated	4.7	±5%	350	19	5 @ 2	900 @ 10	-65 ~ 150	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement:

BZX84B4V7-TP (Micro Commercial Co) is the preferred direct replacement for the obsolete BZX84C4V7_D87Z. This part maintains identical power rating (350 mW), matching zener voltage (4.7 V), impedance (80 Ohms), and reverse leakage specifications. The operating temperature range (-55°C ~ 150°C) is identical to the original part. Product status is active with RoHS3 compliance. Tolerance specification (±2%) is superior to the original (±6%), providing tighter voltage regulation.

Secondary Recommendations - Active onsemi Alternatives:

BZX84C4V7LT1G and BZX84C4V7LT3G are active onsemi products with identical electrical characteristics to the original part except for reduced power rating (225 mW versus 350 mW). These parts are suitable for applications where power dissipation does not exceed 225 mW. Both parts feature extended operating temperature range (-65°C ~ 150°C) and RoHS3 compliance. The LT1G variant is supplied in Cut Tape & Digi-Reel packaging, while LT3G is supplied in Tape & Reel packaging.

Automotive-Grade Options:

SZBZX84C4V7LT1G and SZBZX84C4V7LT3G are automotive-qualified alternatives (AEC-Q101) from onsemi. These parts are identical to the standard BZX84C4V7LT1G and BZX84C4V7LT3G variants but carry automotive-grade qualification. Selection of these parts is appropriate for automotive applications requiring enhanced reliability and traceability.

Alternative Manufacturer Options:

BZX84-C4V7,215 (Nexperia USA Inc.) and BZX84-A4V7,215 (Nexperia USA Inc.) provide active alternatives with automotive-grade qualification (AEC-Q101). The BZX84-A4V7,215 variant offers superior tolerance (±1%) compared to the original specification. Both parts maintain 250 mW power rating and extended operating temperature range (-65°C ~ 150°C).

Higher Power Alternative:

BZX84C4V7-7-F (Diodes Incorporated) provides 300 mW power rating, positioned between the standard 225 mW and 350 mW options. This part is suitable for applications requiring moderate power dissipation with active product status and RoHS3 compliance.

Impedance Consideration:

MMBZ5230B-7-F (Diodes Incorporated) differs from other substitutes with impedance specification of 19 Ohms (versus 80 Ohms for all other parts) and reverse leakage of 5 µA @ 2 V (versus 3 µA @ 2 V). This part is suitable only for applications where lower impedance characteristics are required or beneficial.

Frequently Asked Questions (FAQ)

Q: Can BZX84C4V7LT1G replace BZX84C4V7_D87Z in all applications?

A: BZX84C4V7LT1G is electrically compatible with BZX84C4V7_D87Z for applications where power dissipation does not exceed 225 mW. The original part is rated for 350 mW. If your circuit dissipates more than 225 mW in the zener diode, this substitute is not appropriate. All other electrical parameters (zener voltage, impedance, reverse leakage, forward voltage) are identical.

Q: What is the difference between BZX84C4V7LT1G and BZX84C4V7LT3G?

A: Both parts have identical electrical specifications. The difference is packaging: BZX84C4V7LT1G is supplied in Cut Tape & Digi-Reel format, while BZX84C4V7LT3G is supplied in Tape & Reel format. Selection depends on your procurement and assembly requirements.

Q: Should I use SZBZX84C4V7LT1G for non-automotive applications?

A: SZBZX84C4V7LT1G is an automotive-qualified variant (AEC-Q101) of the standard BZX84C4V7LT1G. It can be used in non-automotive applications. The automotive qualification provides additional quality assurance and traceability but does not restrict use in other applications. Selection should be based on your quality and reliability requirements.

Q: Why does MMBZ5230B-7-F have different impedance (19 Ohms versus 80 Ohms)?

A: MMBZ5230B-7-F is a different diode series with different internal characteristics. While it maintains the same 4.7 V zener voltage and 350 mW power rating, the lower impedance specification indicates different dynamic response characteristics. This part is suitable only if your circuit design specifically requires or benefits from lower impedance performance.

Q: Is BZX84B4V7-TP a direct replacement for BZX84C4V7_D87Z?

A: Yes. BZX84B4V7-TP is a direct replacement with identical power rating (350 mW), zener voltage (4.7 V), impedance (80 Ohms), and operating temperature range (-55°C ~ 150°C). The tolerance specification (±2%) is superior to the original (±6%). This part has active product status and RoHS3 compliance.

Q: Can I use BZX84-A4V7,215 where ±6% tolerance is required?

A: BZX84-A4V7,215 has ±1% tolerance, which is tighter than the ±6% requirement. Parts with tighter tolerance specifications are acceptable for applications requiring ±6% tolerance. This part is suitable for your application and provides superior voltage regulation accuracy.

Q: What is the temperature range difference between the original part and substitutes?

A: The original BZX84C4V7_D87Z operates from -55°C to 150°C. Most active substitutes (BZX84C4V7LT1G, BZX84C4V7LT3G, SZBZX84C4V7LT1G, SZBZX84C4V7LT3G, BZX84C4V7-7-F, BZX84-A4V7,215, BZX84-C4V7,215, MMBZ5230B-7-F) operate from -65°C to 150°C, providing extended low-temperature capability. BZX84B4V7-TP matches the original -55°C to 150°C range. Selection depends on your application's temperature requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original obsolete part (BZX84C4V7_D87Z) does not have RoHS status specified. If RoHS3 compliance is required for your application, all listed substitutes meet this requirement.

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