BZX84C33_D87Z Equivalent & Substitute Parts

Part Overview

The BZX84C33_D87Z is a 33 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 33 V Zener regulation in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Tolerance	±6%	—
Power - Maximum	350	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 23.1 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BZX84C33_D87Z is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 33 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Tolerance: ±6% or tighter
Impedance (Maximum): 80 Ohms or lower
Reverse leakage current: 50 nA @ 23.1 V or lower
Forward voltage: 900 mV @ 10 mA or lower
Operating temperature range: Must encompass -55°C to 150°C minimum

Secondary Considerations:

Power rating: 350 mW or higher
Product status: Active status preferred for long-term availability
Compliance certifications: RoHS3 compliance and AEC-Q101 qualification where applicable

Substitute parts are grouped by their ability to meet or exceed these parameters without deviation. Parts with lower power ratings (225 mW) are acceptable substitutes provided all other electrical characteristics remain within specification. Parts with tighter tolerance specifications (±5% or ±2%) are direct upgrades. Automotive-grade variants (SZBZX84 series) with AEC-Q101 qualification are suitable for applications requiring automotive reliability standards.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	Status
BZX84C33_D87Z	onsemi	33	±6%	350	80	50 @ 23.1	900 @ 10	-55 to 150	SOT-23-3	Obsolete
BZX84C33LT1G	onsemi	33	±6%	225	80	50 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84C33LT3G	onsemi	33	±6%	225	80	50 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
SZBZX84C33LT1G	onsemi	33	±6%	225	80	50 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
SZBZX84C33LT3G	onsemi	33	±6%	225	80	50 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84-C33,215	NXP Semiconductors	33	±5%	250	80	50 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84-C33,235	Nexperia USA Inc.	33	±5%	250	80	50 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84B33-TP	Micro Commercial Co	33	±2%	350	80	100 @ 23.1	900 @ 10	-55 to 150	SOT-23-3	Active
BZX84C33-7-F	Diodes Incorporated	33	±6%	300	80	100 @ 23.1	900 @ 10	-65 to 150	SOT-23-3	Active
MMBZ5257B-7-F	Diodes Incorporated	33	±5%	350	58	100 @ 25	900 @ 10	-65 to 150	SOT-23-3	Active
MMBZ5257B-TP	Micro Commercial Co	33	±5%	350	58	100 @ 25	900 @ 10	-55 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Preferred):

BZX84C33LT1G and BZX84C33LT3G (onsemi) are the primary recommended substitutes. Both are active products from the original manufacturer with identical electrical specifications to the obsolete BZX84C33_D87Z, with the exception of reduced power rating (225 mW versus 350 mW). These parts are suitable for applications where the 225 mW power rating is sufficient. Both variants are RoHS3 compliant and carry unlimited moisture sensitivity rating.

Tier 2 - Automotive-Grade Substitutes:

SZBZX84C33LT1G and SZBZX84C33LT3G (onsemi) are automotive-qualified variants of the standard BZX84C33 series, carrying AEC-Q101 certification. These parts are appropriate for automotive and mission-critical applications requiring enhanced reliability standards. Electrical specifications are identical to Tier 1 substitutes.

Tier 3 - Cross-Manufacturer Substitutes:

BZX84-C33,215 and BZX84-C33,235 (NXP Semiconductors / Nexperia) provide active alternatives with tighter tolerance (±5% versus ±6%) and higher power rating (250 mW). Both carry AEC-Q101 automotive qualification and RoHS3 compliance. These parts are suitable for applications requiring automotive-grade reliability.

Tier 4 - Enhanced Performance Substitutes:

BZX84B33-TP (Micro Commercial Co) matches the original 350 mW power rating with superior tolerance (±2%). MMBZ5257B-7-F and MMBZ5257B-TP (Diodes Incorporated and Micro Commercial Co) offer 350 mW power rating with lower impedance (58 Ohms versus 80 Ohms), providing improved dynamic performance. These parts are suitable for applications requiring higher power dissipation or lower output impedance.

Tier 5 - Moderate Power Substitutes:

BZX84C33-7-F (Diodes Incorporated) provides 300 mW power rating with active product status and RoHS3 compliance. This part is suitable for applications where 225 mW is marginal but 350 mW is excessive.

Selection Criteria:

For direct replacement in existing designs: Select Tier 1 or Tier 2 substitutes
For automotive applications: Select Tier 2 or Tier 3 substitutes with AEC-Q101 certification
For applications requiring maximum power dissipation: Select Tier 4 substitutes
For applications with tight tolerance requirements: Select BZX84B33-TP (±2%) or Tier 3 parts (±5%)
For long-term supply assurance: Prioritize active product status over obsolete designation

All recommended substitutes maintain SOT-23-3 package compatibility and surface mount mounting type. Operating temperature ranges of -65°C to 150°C (Tier 1, 2, 3, and 5) exceed the original -55°C to 150°C specification, providing enhanced thermal performance.

Frequently Asked Questions (FAQ)

Q: Can BZX84C33LT1G replace BZX84C33_D87Z directly in my circuit?

A: Yes. BZX84C33LT1G is electrically equivalent with identical Zener voltage (33 V), tolerance (±6%), impedance (80 Ohms), and forward voltage characteristics. The primary difference is reduced power rating (225 mW versus 350 mW). Direct replacement is valid if your circuit dissipates 225 mW or less in the Zener diode.

Q: What is the difference between BZX84C33LT1G and BZX84C33LT3G?

A: Both parts are electrically identical. The difference is packaging: LT1G is supplied in Cut Tape and Digi-Reel format, while LT3G is supplied in Tape & Reel format. Select based on your procurement and assembly requirements.

Q: Are automotive-grade SZBZX84C33 variants suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 certification exceed standard reliability requirements and are suitable for any application. They provide enhanced quality assurance and are appropriate for mission-critical or high-reliability designs.

Q: Why do some substitutes have lower power ratings (225 mW) than the original (350 mW)?

A: onsemi's current production BZX84C33 series uses 225 mW power rating as the standard specification. This reflects modern design optimization and manufacturing capability. The 225 mW rating is sufficient for most applications. If your circuit requires higher power dissipation, select MMBZ5257B variants (350 mW) or BZX84B33-TP (350 mW).

Q: What does the tolerance specification (±6%, ±5%, ±2%) mean for Zener diode selection?

A: Tolerance specifies the allowable deviation from the nominal 33 V Zener voltage. ±6% tolerance allows 31.02 V to 34.98 V; ±5% allows 31.35 V to 34.65 V; ±2% allows 32.34 V to 33.66 V. Tighter tolerance (lower percentage) provides more precise voltage regulation. Select based on your circuit's voltage tolerance requirements.

Q: Can I use MMBZ5257B-7-F as a substitute if my circuit requires lower impedance?

A: Yes. MMBZ5257B-7-F has lower impedance (58 Ohms versus 80 Ohms), which improves dynamic response and reduces output impedance variation with current changes. This is a performance upgrade suitable for applications requiring tighter voltage regulation under varying load conditions.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitutes are RoHS3 compliant except BZX84B33-TP, for which RoHS status is not specified in the provided data. Verify RoHS compliance with the manufacturer if this is a requirement for your application.

Q: What is the difference between NXP BZX84-C33,215 and Nexperia BZX84-C33,235?

A: Both are electrically identical 33 V Zener diodes with ±5% tolerance and 250 mW power rating. The difference is manufacturer designation and packaging format. BZX84-C33,215 is from NXP Semiconductors; BZX84-C33,235 is from Nexperia USA Inc. Both carry AEC-Q101 automotive qualification.

Q: Is the operating temperature range important for my selection?

A: Yes. The original BZX84C33_D87Z operates from -55°C to 150°C. Most substitutes extend this to -65°C to 150°C, providing wider operating range. If your application operates below -55°C, select substitutes with -65°C minimum rating. If your application operates only above -55°C, either specification is acceptable.

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

A: All recommended substitutes are electrically equivalent within specified tolerances and package compatibility. Mixing different manufacturers or variants in the same production run is acceptable from an electrical standpoint. However, verify with your quality assurance procedures regarding component traceability and supply chain documentation requirements.

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