BZX84C30-7 Equivalent & Substitute Parts

Part Overview

The BZX84C30-7 is a 30 V Zener diode rated for 300 mW power dissipation in a surface mount SOT-23-3 package, manufactured by Diodes Incorporated. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. The BZX84C30-7 operates across a temperature range of -65°C to 150°C with ±7% voltage tolerance and is classified as RoHS non-compliant. Equivalent alternatives are available from multiple manufacturers with improved compliance status and active product availability.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	30 V
Power - Max	300 mW
Tolerance	±7%
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 21 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 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 BZX84C30-7 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 30 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating temperature range compatibility
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (300 mW nominal, with tolerance for lower ratings in specific applications)
Voltage tolerance (±7% or tighter)
Impedance maximum (80 Ohms or lower)
Reverse leakage current specifications
Forward voltage characteristics

Substitute parts are grouped into three categories based on electrical equivalence and product status:

Category 1: Direct Parametric Equivalents (Diodes Incorporated) Parts maintaining identical electrical specifications with improved compliance and active status.

Category 2: Manufacturer-Recommended Alternatives (NXP, Vishay, onsemi, Micro Commercial Co, Central Semiconductor) Parts with equivalent or superior electrical performance, active product status, and manufacturer recommendations for cross-reference applications.

Category 3: Functional Equivalents with Parameter Variations Parts meeting core zener voltage and package requirements with acceptable variations in power rating, tolerance, or impedance within application tolerance windows.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Product Status	RoHS Status
BZX84C30-7	Diodes Incorporated	30 V	300 mW	±7%	80 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Discontinued	Non-compliant
BZX84B30-7-F	Diodes Incorporated	30 V	300 mW	±2%	80 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84C30-7-F	Diodes Incorporated	30 V	300 mW	±7%	80 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-C30,215	NXP Semiconductors	30 V	250 mW	±5%	80 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	Not specified
BZX84-C30,235	NXP USA Inc.	30 V	250 mW	±5%	80 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	Not specified
BZX84B30-G3-08	Vishay General Semiconductor	30 V	300 mW	±2%	80 Ω	Not specified	-55°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84C30-HE3-18	Vishay General Semiconductor	30 V	300 mW	±5%	80 Ω	Not specified	-55°C ~ 150°C	SOT-23-3	Obsolete	ROHS3 Compliant
BZX84C30-TP	Micro Commercial Co	30 V	350 mW	±5%	80 Ω	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84C30LT1G	onsemi	30 V	225 mW	±7%	80 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
CMPZ5256B TR PBFREE	Central Semiconductor Corp	30 V	350 mW	±5%	49 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
MMBZ5256BLT1G	onsemi	30 V	225 mW	±5%	49 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: BZX84C30-7-F (Diodes Incorporated)

The BZX84C30-7-F is the direct equivalent replacement for the discontinued BZX84C30-7. It maintains identical electrical specifications (30 V, 300 mW, ±7% tolerance, 80 Ω impedance) and operating temperature range (-65°C to 150°C). The primary advantage is active product status with ROHS3 compliance and significantly higher inventory availability (21,200 units). This part is supplied in Cut Tape and Digi-Reel packaging formats.

Secondary Selection: BZX84B30-7-F (Diodes Incorporated)

The BZX84B30-7-F offers improved voltage tolerance (±2% versus ±7%) while maintaining all other electrical parameters and the full operating temperature range. This part is active with ROHS3 compliance and available in Tape & Reel packaging (9,735 units in stock). Selection of this part is appropriate for applications requiring tighter voltage regulation.

Alternative Selection: BZX84-C30,235 (NXP USA Inc.)

The BZX84-C30,235 is an automotive-grade alternative (AEC-Q101 qualified) with 30 V nominal voltage and ±5% tolerance. Power rating is reduced to 250 mW, which is acceptable for applications not requiring the full 300 mW dissipation capability. This part is active with the highest inventory availability (111,030 units) and is supplied in bulk packaging.

Higher Power Alternative: BZX84C30-TP (Micro Commercial Co)

The BZX84C30-TP provides increased power dissipation capability (350 mW) with 30 V nominal voltage and ±5% tolerance. This part is suitable for applications requiring thermal margin beyond the original 300 mW specification. It is active with ROHS3 compliance and available in Tape & Reel packaging.

Lower Power Alternatives: BZX84C30LT1G and MMBZ5256BLT1G (onsemi)

Both onsemi parts maintain 30 V nominal voltage with reduced power ratings (225 mW). The BZX84C30LT1G matches the original ±7% tolerance and full -65°C to 150°C temperature range. The MMBZ5256BLT1G offers ±5% tolerance with lower impedance (49 Ω). These parts are suitable for applications with lower power dissipation requirements and are active with ROHS3 compliance.

Impedance Consideration: CMPZ5256B TR PBFREE (Central Semiconductor Corp)

The CMPZ5256B provides 30 V nominal voltage with 350 mW power rating and significantly lower impedance (49 Ω versus 80 Ω). This lower impedance characteristic may be beneficial for applications requiring improved voltage regulation under load transients. The part is active with ROHS3 compliance.

Avoid: BZX84C30-HE3-18 (Vishay General Semiconductor)

This part is marked as obsolete and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can BZX84C30-7-F be used as a direct replacement for BZX84C30-7?

A: Yes. The BZX84C30-7-F is a direct parametric equivalent with identical zener voltage (30 V), power rating (300 mW), voltage tolerance (±7%), impedance (80 Ω), and operating temperature range (-65°C to 150°C). The primary differences are active product status and ROHS3 compliance. Both parts use the SOT-23-3 package.

Q: What is the difference between BZX84B30-7-F and BZX84C30-7-F?

A: The primary difference is voltage tolerance. The BZX84B30-7-F offers ±2% tolerance compared to ±7% for the BZX84C30-7-F. All other electrical parameters are identical (30 V nominal, 300 mW, 80 Ω impedance). Selection depends on application voltage regulation requirements.

Q: Are NXP BZX84-C30 parts suitable replacements?

A: NXP BZX84-C30,215 and BZX84-C30,235 are suitable for applications where 250 mW power dissipation is acceptable. Both maintain 30 V nominal voltage and 80 Ω impedance with ±5% tolerance. These parts are automotive-grade (AEC-Q101 qualified) and offer the highest inventory availability. They are not suitable for applications requiring the full 300 mW dissipation capability of the original part.

Q: What is the significance of lower impedance in CMPZ5256B and MMBZ5256BLT1G?

A: Lower impedance (49 Ω versus 80 Ω) provides improved voltage regulation under load transients and reduces output impedance variation across the operating current range. This characteristic is beneficial for precision voltage reference applications. However, impedance difference does not affect basic zener voltage or package compatibility.

Q: Can parts with reduced power ratings (225 mW) be used in place of 300 mW parts?

A: Reduced power rating parts (BZX84C30LT1G and MMBZ5256BLT1G at 225 mW) are suitable only for applications where the actual power dissipation does not exceed the lower rating. Thermal analysis of the specific application is required to confirm acceptability. These parts maintain all other electrical specifications and package compatibility.

Q: What is the impact of operating temperature range differences?

A: The original BZX84C30-7 operates from -65°C to 150°C. Some alternatives (Vishay and Micro Commercial Co parts) operate from -55°C to 150°C. The reduced lower temperature limit (-55°C versus -65°C) may be unacceptable for applications requiring full -65°C operation. Verify application temperature requirements before selection.

Q: Are all substitute parts available in SOT-23-3 packaging?

A: Yes. All listed substitute parts use SOT-23-3 package (also designated TO-236-3 or SC-59). Packaging compatibility is confirmed across all alternatives. Differences exist in supplier packaging formats (Tape & Reel, Cut Tape, Digi-Reel, or Bulk), which affect procurement and handling but not component functionality.

Q: What is the significance of RoHS compliance status?

A: The original BZX84C30-7 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components. ROHS3 compliance is mandatory for most commercial and industrial applications and is strongly recommended for new designs.

Q: Which part offers the best balance of availability and specification match?

A: The BZX84C30-7-F (Diodes Incorporated) provides the optimal balance with 21,200 units in stock, identical electrical specifications to the original part, active product status, and ROHS3 compliance. For applications requiring higher inventory levels, the BZX84-C30,235 (NXP) offers 111,030 units with acceptable power rating reduction to 250 mW.

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