CMPZ5230B BK PBFREE Zener Diode 4.7V 350mW SOT-23 Equivalent & Substitute Parts

Part Overview

The CMPZ5230B BK PBFREE is a surface mount zener diode manufactured by Central Semiconductor Corp, rated at 4.7V nominal zener voltage with 350mW maximum power dissipation in SOT-23 packaging. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOT-23 package family. Substitutes may be required due to inventory availability, supply chain considerations, or specific packaging format preferences (Bulk, Cut Tape, or Tape & Reel).

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	19	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-
MSL	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the CMPZ5230B BK PBFREE is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 4.7V nominal
Package type: SOT-23-3 / TO-236-3 / SC-59 (mechanically and electrically equivalent)
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance
MSL rating: 1 (Unlimited)

Secondary Compatibility Parameters:

Tolerance: ±5% or tighter
Power rating: 350mW or higher
Impedance (Zzt): 19 Ohms or lower (lower impedance indicates better regulation)
Reverse leakage current: 5µA @ 2V or lower
Forward voltage: 900mV @ 10mA or lower

Substitute parts are grouped into two categories based on power dissipation capability:

Category A - Full Power Match (350mW): Parts with 350mW or higher power rating maintain identical thermal performance characteristics.

Category B - Reduced Power (250-300mW): Parts with 250mW or 300mW ratings provide functional equivalence for applications where the full 350mW capability is not required. These substitutes are suitable for designs with adequate thermal margin or lower power dissipation requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vr Leakage (µA @ 2V)	Vf (mV @ 10mA)	Temp Range (°C)	Package	Status
CMPZ5230B BK PBFREE	Central Semiconductor Corp	4.7	±5%	350	19	5	900	-65 to 150	SOT-23	Active
MMBZ5230B-7-F	Diodes Incorporated	4.7	±5%	350	19	5	900	-65 to 150	SOT-23-3	Active
BZX84-A4V7,215	Nexperia USA Inc.	4.7	±1%	250	80	3	900	-65 to 150	TO-236AB	Active
BZX84-B4V7,215	NXP Semiconductors	4.7	±2%	250	80	3	900	-65 to 150	TO-236AB	Active
BZX84-C4V7,215	NXP USA Inc.	4.7	±5%	250	80	3	900	-65 to 150	SOT-23	Active
BZX84-C4V7,235	Nexperia USA Inc.	4.7	±5%	250	80	3	900	-65 to 150	TO-236AB	Active
BZX84B4V7-E3-08	Vishay General Semiconductor - Diodes Division	4.7	±2%	300	80	3	-	-55 to 150	SOT-23-3	Active
BZX84B4V7-HE3-18	Vishay General Semiconductor - Diodes Division	4.7	±2%	300	80	3	-	-55 to 150	SOT-23-3	Obsolete
BZX84C4V7-7-F	Diodes Incorporated	4.7	±6%	300	80	3	900	-65 to 150	SOT-23-3	Active
BZX84C4V7-E3-08	Vishay General Semiconductor - Diodes Division	4.7	±6%	300	80	3	-	-55 to 150	SOT-23-3	Active
BZX84C4V7-G3-18	Vishay General Semiconductor - Diodes Division	4.7	±5%	300	80	3	-	-55 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

MMBZ5230B-7-F from Diodes Incorporated is the direct functional equivalent to CMPZ5230B BK PBFREE. Both parts share identical electrical specifications: 4.7V nominal zener voltage, ±5% tolerance, 350mW power rating, 19 Ohms maximum impedance, and -65°C to 150°C operating temperature range. Both are RoHS3 compliant with MSL 1 (Unlimited). This substitute provides pin-for-pin compatibility and requires no circuit redesign.

Category A Substitutes (350mW Power Rating):

Only MMBZ5230B-7-F qualifies in this category as a full power equivalent.

Category B Substitutes (250-300mW Power Rating):

The following parts are suitable substitutes where application thermal design permits operation at reduced power dissipation:

BZX84-C4V7,215 (NXP USA Inc., 250mW): Matches ±5% tolerance and -65°C to 150°C temperature range. Active product status. AEC-Q101 automotive qualified.
BZX84C4V7-7-F (Diodes Incorporated, 300mW): Provides 300mW power rating with ±6% tolerance. Active product status. Operating temperature -65°C to 150°C.
BZX84C4V7-G3-18 (Vishay General Semiconductor, 300mW): Offers 300mW power rating with ±5% tolerance matching the original specification. Active product status. Operating temperature -55°C to 150°C (minimum -55°C vs. -65°C original).

Parts Not Recommended:

BZX84B4V7-HE3-18: Product status is Obsolete. Avoid for new designs.
BZX84-A4V7,215 and BZX84-B4V7,215: Reduced power rating (250mW) combined with higher impedance (80 Ohms vs. 19 Ohms) results in degraded voltage regulation performance.
BZX84B4V7-E3-08 and BZX84C4V7-E3-08: Operating temperature minimum of -55°C does not meet the original -65°C specification.

Frequently Asked Questions (FAQ)

Q: Can I use a 250mW zener diode as a substitute for the 350mW CMPZ5230B?

A: Yes, if your circuit design includes adequate thermal margin and the application does not require the full 350mW dissipation capability. The 250mW parts (BZX84-C4V7,215 and BZX84-C4V7,235) maintain identical zener voltage (4.7V) and tolerance (±5%). However, verify that your power budget does not exceed 250mW under worst-case operating conditions.

Q: What is the difference between SOT-23 and SOT-23-3 packaging?

A: SOT-23 and SOT-23-3 refer to the same physical package format (TO-236-3, SC-59). The "-3" designation explicitly indicates three leads. All substitute parts listed are mechanically compatible with the original SOT-23 package.

Q: Why do some substitute parts have higher impedance (80 Ohms vs. 19 Ohms)?

A: Impedance (Zzt) affects voltage regulation quality. Lower impedance provides better voltage stability across varying load currents. The CMPZ5230B with 19 Ohms impedance offers superior regulation compared to 80 Ohms alternatives. For applications requiring tight voltage regulation, select substitutes with impedance matching or lower than the original specification.

Q: Is MMBZ5230B-7-F a direct replacement for CMPZ5230B BK PBFREE?

A: Yes. MMBZ5230B-7-F is a direct equivalent with identical electrical and mechanical specifications. No circuit modifications are required. Both parts are RoHS3 compliant, MSL 1, and rated for -65°C to 150°C operation.

Q: Can I substitute a part with ±1% or ±2% tolerance for the ±5% original?

A: Yes. Tighter tolerance specifications (±1%, ±2%) are superior to the original ±5% tolerance and provide better voltage accuracy. Parts such as BZX84-A4V7,215 (±1%) and BZX84-B4V7,215 (±2%) are functionally compatible, though they feature reduced power ratings (250mW) and higher impedance (80 Ohms).

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard. Parts bearing this certification (BZX84-A4V7,215, BZX84-B4V7,215, BZX84-C4V7,235, and BZX84B4V7-HE3-18) meet stringent reliability and performance requirements for automotive applications. Use AEC-Q101 qualified parts for automotive or high-reliability applications.

Q: Should I avoid obsolete parts like BZX84B4V7-HE3-18?

A: Yes. Obsolete parts present supply chain risk and may become unavailable for future production runs or field repairs. Select only Active status parts for new designs: MMBZ5230B-7-F, BZX84-C4V7,215, BZX84C4V7-7-F, BZX84C4V7-G3-18, or BZX84-C4V7,235.

Q: Does operating temperature range affect substitution compatibility?

A: Yes. The original CMPZ5230B operates from -65°C to 150°C. Substitutes with minimum operating temperature of -55°C (such as BZX84B4V7-E3-08 and BZX84C4V7-E3-08) do not meet the full temperature specification. Use these parts only if your application does not require operation below -55°C.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message