BZX84C22_D87Z Equivalent & Substitute Parts

Part Overview

The BZX84C22_D87Z is a surface-mount Zener diode manufactured by onsemi, rated at 22 V nominal Zener voltage with 350 mW maximum power dissipation in a 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 utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±6%	—
Power - Max	350	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 15.4 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 BZX84C22_D87Z is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 22 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Forward voltage: 900 mV @ 10 mA maximum
Impedance: 55 Ohms maximum
Reverse leakage current: 50 nA @ 15.4 V

Secondary Compatibility Factors:

Power dissipation rating: 250 mW minimum (parts rated 250 mW, 300 mW, or 350 mW are acceptable for applications within the original 350 mW specification)
Tolerance: ±5% or ±6% (both acceptable)
Operating temperature range: -55°C to 150°C minimum (extended ranges such as -65°C to 150°C are acceptable)

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria) and Parametric Equivalents (meeting all primary criteria with minor variations in secondary parameters such as power rating or tolerance).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Temp Range (°C)	Status
BZX84C22_D87Z	onsemi	22	±6%	350	55	900	-55 ~ 150	Obsolete
BZX84C22LT1G	onsemi	22	±6%	225	55	900	-65 ~ 150	Active
BZX84-C22,215	Nexperia USA Inc.	22	±5%	250	55	900	-65 ~ 150	Active
BZX84-C22,235	NXP USA Inc.	22	±5%	250	55	900	-65 ~ 150	Active
BZX84B22-7-F	Diodes Incorporated	22	±2%	300	55	900	-65 ~ 150	Active
BZX84C22-7-F	Diodes Incorporated	22	±6%	300	55	900	-65 ~ 150	Active
MMBZ5251B-TP	Micro Commercial Co	22	±5%	350	29	900	-55 ~ 150	Active
BZX84C22-TP	Micro Commercial Co	22	±5%	350	55	900	-55 ~ 150	Active

Engineering Selection Recommendations

Primary Recommendation: BZX84C22-TP

The BZX84C22-TP (Micro Commercial Co) is the optimal substitute for the obsolete BZX84C22_D87Z. This part maintains identical electrical specifications across all primary parameters: 22 V Zener voltage, ±5% tolerance, 350 mW power rating, 55 Ohms impedance, and 900 mV forward voltage. The operating temperature range (-55°C to 150°C) matches the original specification. Product status is Active, ensuring reliable long-term availability. RoHS3 compliance and REACH Unaffected status confirm regulatory alignment.

Secondary Recommendations:

BZX84C22LT1G (onsemi) — Maintains onsemi manufacturer continuity with identical electrical characteristics. Power rating is reduced to 225 mW, suitable for applications not requiring the full 350 mW dissipation. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin. Active product status with RoHS3 compliance.

BZX84-C22,215 (Nexperia USA Inc.) — Meets all primary substitution criteria with 250 mW power rating. Tolerance improved to ±5%. AEC-Q101 automotive qualification available. Active status with RoHS3 compliance.

BZX84-C22,235 (NXP USA Inc.) — Functionally equivalent to BZX84-C22,215 with identical electrical specifications. AEC-Q101 automotive qualification. Highest inventory availability (20,809 units). Active status with RoHS3 compliance.

BZX84C22-7-F (Diodes Incorporated) — Provides 300 mW power rating with improved ±2% tolerance. Extended temperature range (-65°C to 150°C). Active status with RoHS3 compliance. High inventory availability (35,300 units).

Alternative for Lower Impedance Applications: MMBZ5251B-TP

The MMBZ5251B-TP (Micro Commercial Co) is suitable only for applications where lower dynamic impedance (29 Ohms versus 55 Ohms) is beneficial. All other electrical parameters match the original specification. Reverse leakage current is elevated to 100 nA @ 17 V. Active status with RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can BZX84C22LT1G replace BZX84C22_D87Z in all applications?

A: BZX84C22LT1G is electrically equivalent for Zener voltage, tolerance, impedance, and forward voltage. The power rating is reduced from 350 mW to 225 mW. Substitution is valid only for applications where power dissipation does not exceed 225 mW. Verify circuit power requirements before selection.

Q: What is the difference between BZX84-C22,215 and BZX84-C22,235?

A: Both parts are electrically identical with 22 V Zener voltage, ±5% tolerance, 250 mW power rating, and 55 Ohms impedance. The primary difference is packaging: BZX84-C22,215 is supplied in Tape & Reel format, while BZX84-C22,235 is supplied in Bulk. Both are AEC-Q101 qualified and Active status.

Q: Why does MMBZ5251B-TP have lower impedance (29 Ohms)?

A: MMBZ5251B-TP is a different product line with inherently lower dynamic impedance characteristics. While this may provide improved voltage regulation in certain circuit topologies, it represents a design variation rather than a direct equivalent. Use only when lower impedance is a circuit requirement.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance status and REACH Unaffected designation, confirming regulatory alignment with current environmental standards.

Q: What is the significance of the ±2% tolerance in BZX84B22-7-F?

A: The ±2% tolerance in BZX84B22-7-F represents tighter Zener voltage control compared to the original ±6% specification. This improved tolerance is beneficial for precision voltage reference applications but is not required for general-purpose Zener diode applications. The part is otherwise electrically equivalent.

Q: Can I use parts with extended temperature ranges (-65°C to 150°C) in place of the original (-55°C to 150°C)?

A: Yes. Extended temperature ranges are backward compatible. Parts rated -65°C to 150°C exceed the original -55°C to 150°C specification and are suitable for all applications within the original temperature envelope.

Q: Which substitute offers the best long-term availability?

A: BZX84-C22,235 (NXP USA Inc.) and BZX84C22-7-F (Diodes Incorporated) both carry Active product status with high inventory levels (20,809 and 35,300 units respectively), indicating strong long-term supply chain support.

Q: Is the SOT-23-3 package identical across all substitute parts?

A: Yes. All substitute parts use SOT-23-3 (TO-236-3, SC-59) surface-mount packaging. Physical footprint and pin configuration are identical, enabling direct PCB layout compatibility without redesign.

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