BZX84C30_D87Z Equivalent & Substitute Parts

Part Overview

The BZX84C30_D87Z is a 30 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. Identifying equivalent and substitute parts is 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 (Nominal)	30	V
Tolerance	±7%	—
Power - Maximum	350	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 21 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 BZX84C30_D87Z is determined by strict electrical and mechanical compatibility criteria. The following parameters must align for a part to function as a direct substitute:

Critical Parameters for Substitution:

Zener voltage: 30 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59) for direct mechanical compatibility
Impedance: 80 Ohms maximum
Forward voltage: 900 mV @ 10 mA
Reverse leakage current: 50 nA @ 21 V or lower

Allowable Variations:

Power rating: May be equal to or greater than 350 mW
Tolerance: May be tighter (lower percentage) than ±7%
Operating temperature range: May be extended beyond -55°C to 150°C
Product status: Active parts are preferred over obsolete classifications

Substitute parts are grouped into two categories: SOT-23-3 package equivalents (direct mechanical replacement) and alternative package options (SOT-323) that maintain electrical specifications but require PCB layout modification.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ω)	Package	Status
BZX84C30_D87Z	onsemi	30	±7%	350	80	SOT-23-3	Obsolete
BZX84C30LT1G	onsemi	30	±7%	225	80	SOT-23-3	Active
SZBZX84C30LT1G	onsemi	30	±7%	225	80	SOT-23-3	Active
BZX84-C30,215	NXP Semiconductors	30	±5%	250	80	SOT-23-3	Active
BZX84-C30,235	NXP USA Inc.	30	±5%	250	80	SOT-23-3	Active
BZX84B30-TP	Micro Commercial Co	30	±2%	350	80	SOT-23-3	Active
BZX84C30-7-F	Diodes Incorporated	30	±7%	300	80	SOT-23-3	Active
BZX84C30W-7-F	Diodes Incorporated	30	±6.67%	200	80	SOT-323	Active
BZX84C30W-TP	Micro Commercial Co	30	±7%	200	80	SOT-323	Active
MMBZ5256B-7-F	Diodes Incorporated	30	±5%	350	49	SOT-23-3	Active
MMBZ5256B-TP	Micro Commercial Co	30	±5%	350	49	SOT-23-3	Active

Engineering Selection Recommendations

Direct SOT-23-3 Package Substitutes (No PCB Modification Required):

BZX84B30-TP (Micro Commercial Co) — Recommended for applications requiring maximum tolerance precision. Offers ±2% tolerance with 350 mW power rating matching the original specification. Active product status ensures long-term availability.
MMBZ5256B-7-F (Diodes Incorporated) — Suitable for applications where lower impedance (49 Ohms vs. 80 Ohms) is acceptable. Provides 350 mW power rating with ±5% tolerance and active product status. RoHS3 compliant.
BZX84C30-7-F (Diodes Incorporated) — Appropriate for applications with moderate power requirements. Delivers 300 mW with ±7% tolerance matching the original specification. Active product status with RoHS3 compliance.
BZX84-C30,215 or BZX84-C30,235 (NXP Semiconductors) — Qualified for automotive applications (AEC-Q101). Both variants provide 250 mW power with ±5% tolerance and active product status. Suitable for designs requiring automotive-grade components.
BZX84C30LT1G (onsemi) — Maintains manufacturer continuity with onsemi. Offers ±7% tolerance with 225 mW power rating. Extended operating temperature range (-65°C to 150°C) compared to original. Active product status.
SZBZX84C30LT1G (onsemi) — Automotive-qualified variant (AEC-Q101) with extended temperature range. Identical electrical specifications to BZX84C30LT1G with automotive-grade certification. Highest inventory availability (65,400 pcs).

Alternative Package Substitutes (PCB Layout Modification Required):

BZX84C30W-7-F (Diodes Incorporated) — SOT-323 package option for space-constrained designs. Provides 200 mW power with ±6.67% tolerance. Requires PCB redesign due to different footprint.
BZX84C30W-TP (Micro Commercial Co) — SOT-323 package alternative with 200 mW power and ±7% tolerance. Suitable for compact applications where package size reduction is prioritized.

Selection Criteria:

For direct replacement without PCB modification: Select from SOT-23-3 package options (parts 1-6).
For automotive applications: Prioritize BZX84-C30,215, BZX84-C30,235, or SZBZX84C30LT1G (AEC-Q101 qualified).
For maximum tolerance precision: Select BZX84B30-TP (±2%).
For extended temperature operation: Select BZX84C30LT1G or SZBZX84C30LT1G (-65°C to 150°C).
For space-constrained designs: Select SOT-323 package options (parts 7-8) with PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can BZX84C30LT1G replace BZX84C30_D87Z without any circuit modifications?

A: Yes. BZX84C30LT1G is electrically and mechanically compatible. Both components share identical 30 V Zener voltage, ±7% tolerance, 80 Ohms impedance, and SOT-23-3 package. The substitute offers lower power rating (225 mW vs. 350 mW) and extended temperature range (-65°C to 150°C vs. -55°C to 150°C). Circuit modifications are not required if the application does not exceed 225 mW power dissipation.

Q: What is the difference between BZX84-C30,215 and BZX84-C30,235?

A: Both parts are NXP Semiconductors 30 V Zener diodes with identical electrical specifications (±5% tolerance, 250 mW power, 80 Ohms impedance, SOT-23-3 package, AEC-Q101 qualification). The difference is packaging format: BZX84-C30,215 is supplied in Cut Tape format, while BZX84-C30,235 is supplied in Bulk. Electrical performance is identical.

Q: Can MMBZ5256B-7-F be used as a direct substitute?

A: MMBZ5256B-7-F is mechanically and electrically compatible for most applications. It maintains 30 V Zener voltage, 350 mW power rating, and SOT-23-3 package. However, impedance differs (49 Ohms vs. 80 Ohms). This lower impedance may affect circuit behavior in applications sensitive to source impedance. Verify circuit performance before implementation.

Q: Why do some substitutes have lower power ratings than the original?

A: BZX84C30LT1G and BZX84C30W variants offer 225 mW and 200 mW respectively, compared to the original 350 mW. These parts are suitable for applications with lower power dissipation requirements. If your circuit requires 350 mW dissipation capability, select BZX84B30-TP, MMBZ5256B-7-F, or MMBZ5256B-TP instead.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts bearing this qualification (BZX84-C30,215, BZX84-C30,235, SZBZX84C30LT1G) meet stringent reliability and performance requirements for automotive applications. Use these parts for automotive-grade designs.

Q: Can I use SOT-323 package parts (BZX84C30W-7-F, BZX84C30W-TP) as substitutes?

A: SOT-323 parts are electrically compatible but mechanically different. They require PCB footprint redesign and cannot be used as direct drop-in replacements. Use these only if PCB layout modification is feasible and space constraints justify the change.

Q: What is the significance of the ±2% tolerance in BZX84B30-TP?

A: BZX84B30-TP offers tighter tolerance (±2%) compared to the original (±7%). This means the actual Zener voltage will be closer to the nominal 30 V specification, reducing voltage variation across production batches. Use this part for applications requiring precise voltage regulation.

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

A: SZBZX84C30LT1G has the highest inventory (65,400 pcs) and is automotive-qualified with active product status. This combination indicates strong market demand and manufacturer commitment to continued production, supporting long-term supply chain reliability.

Q: Are all substitutes RoHS3 compliant?

A: Not all. BZX84C30LT1G, SZBZX84C30LT1G, BZX84C30-7-F, BZX84C30W-7-F, MMBZ5256B-7-F, and MMBZ5256B-TP are explicitly RoHS3 compliant. BZX84-C30,215, BZX84-C30,235, BZX84B30-TP, and BZX84C30W-TP do not list RoHS3 compliance in provided specifications. Verify compliance requirements for your application.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture-related degradation. All listed substitutes carry MSL 1 rating, meaning they can be stored indefinitely without special moisture control measures, matching the original part's handling requirements.

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