BZX84C15_D87Z Equivalent & Substitute Parts

Part Overview

The BZX84C15_D87Z is a 15 V Zener diode manufactured by onsemi, rated for 350 mW power dissipation in a surface mount SOT-23-3 package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring 15 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±6%	—
Power - Max	350	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 10.5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the BZX84C15_D87Z is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Zener voltage: 15 V (nominal)
Zener voltage tolerance: ±6% or tighter
Power rating: minimum 350 mW
Package type: SOT-23-3 / TO-236-3 / SC-59 (surface mount)
Reverse leakage current: 50 nA @ 10.5 V or lower
Forward voltage: 900 mV @ 10 mA (maximum)
Impedance: 30 Ohms (maximum)

Substitute parts are grouped into two categories:

Direct Substitutes: Parts meeting all electrical specifications and power rating of the original component, with identical or superior performance characteristics.

Parametric Equivalents: Parts with the same nominal Zener voltage and package type but with variations in power rating, tolerance, or leakage characteristics that remain functionally compatible within the specified operating range.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Status
BZX84C15_D87Z	onsemi	15	±6%	350	30	50 @ 10.5V	900 @ 10mA	-55 to 150	Obsolete
BZX84C15LT1G	onsemi	15	±6%	250	30	50 @ 10.5V	900 @ 10mA	-65 to 150	Active
BZX84C15LT3G	onsemi	15	±6%	225	30	50 @ 10.5V	900 @ 10mA	-65 to 150	Active
SZBZX84C15LT3G	onsemi	15	±5%	250	20	50 @ 10.5V	900 @ 10mA	-65 to 150	Active
BZX84-C15,215	Nexperia USA Inc.	15	±5%	250	30	50 @ 10.5V	900 @ 10mA	-65 to 150	Active
BZX84-C15,235	Nexperia USA Inc.	15	±5%	250	30	50 @ 10.5V	900 @ 10mA	-65 to 150	Active
BZX84B15-TP	Micro Commercial Co	15	±2%	350	30	100 @ 10.5V	900 @ 10mA	-55 to 150	Active
BZX84C15-TP	Micro Commercial Co	15	±5%	350	30	100 @ 10.5V	900 @ 10mA	-55 to 150	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

BZX84C15-TP (Micro Commercial Co) and BZX84B15-TP (Micro Commercial Co) are the preferred substitutes for the obsolete BZX84C15_D87Z. Both parts maintain the 350 mW power rating of the original component, ensuring equivalent thermal performance. BZX84C15-TP matches the ±5% tolerance specification and is available in active production status with high inventory levels (78,080 units). BZX84B15-TP offers superior tolerance (±2%) and is also actively produced (3,664 units in stock).

Secondary Substitutes (Suitable for Applications with Lower Power Requirements):

BZX84C15LT1G (onsemi) is an active production alternative with identical electrical characteristics to the original part except for reduced power rating (250 mW versus 350 mW). This part is suitable for applications where the full 350 mW dissipation is not required. Extended temperature range (-65°C to 150°C) provides additional operational margin.

SZBZX84C15LT3G (onsemi) offers improved tolerance (±5% versus ±6%) and lower impedance (20 Ohms versus 30 Ohms), with AEC-Q101 automotive qualification. This part is recommended for automotive-grade applications requiring enhanced reliability.

Nexperia Alternatives:

BZX84-C15,215 and BZX84-C15,235 (Nexperia USA Inc.) provide equivalent electrical performance with ±5% tolerance and 250 mW power rating. Both parts carry AEC-Q101 automotive qualification and are actively produced. These parts are suitable for applications where automotive-grade components are specified.

Selection Criteria:

For direct replacement with identical power rating: BZX84C15-TP or BZX84B15-TP
For extended temperature range: BZX84C15LT1G or BZX84C15LT3G
For automotive applications: SZBZX84C15LT3G, BZX84-C15,215, or BZX84-C15,235
For improved tolerance: BZX84B15-TP (±2%) or SZBZX84C15LT3G (±5%)

All substitute parts are RoHS3 compliant and carry identical REACH and ECCN classifications as the original component.

Frequently Asked Questions (FAQ)

Q: Can BZX84C15LT1G be used as a direct replacement for BZX84C15_D87Z?

A: BZX84C15LT1G is electrically compatible but has a reduced power rating (250 mW versus 350 mW). It is suitable for applications where power dissipation does not exceed 250 mW. For applications requiring the full 350 mW rating, BZX84C15-TP or BZX84B15-TP are recommended.

Q: What is the difference between BZX84C15-TP and BZX84B15-TP?

A: Both parts are manufactured by Micro Commercial Co and maintain the 350 mW power rating. BZX84B15-TP offers tighter tolerance (±2% versus ±5%) and is preferred for applications requiring higher voltage accuracy. Both parts are functionally interchangeable in the BZX84C15_D87Z application.

Q: Are Nexperia parts (BZX84-C15,215 and BZX84-C15,235) compatible with the original onsemi part?

A: Yes. Both Nexperia parts maintain the 15 V nominal Zener voltage, identical forward voltage characteristics, and equivalent impedance. The primary difference is reduced power rating (250 mW versus 350 mW). These parts are suitable for applications where power dissipation does not exceed 250 mW.

Q: What is the significance of the SZBZX84C15LT3G automotive qualification?

A: SZBZX84C15LT3G carries AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and performance standards. This part is recommended for automotive applications or systems requiring automotive-grade component certification.

Q: Can I use BZX84C15LT3G instead of BZX84C15LT1G?

A: BZX84C15LT3G has a slightly lower power rating (225 mW versus 250 mW) but offers identical electrical characteristics otherwise. Selection between these parts depends on specific power dissipation requirements. Both parts are actively produced and available in high quantities.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All substitute parts listed are packaged in SOT-23-3 (TO-236-3, SC-59) surface mount configuration, ensuring mechanical and electrical compatibility with the original BZX84C15_D87Z footprint.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels for automated assembly equipment. Both packaging formats contain identical components; selection depends on production methodology and volume requirements.

Q: Is the BZX84C15_D87Z truly obsolete?

A: Yes. The BZX84C15_D87Z is classified as obsolete by onsemi. Although 944 units remain in inventory, new production has ceased. Active production alternatives must be selected for new designs or ongoing production requirements.

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