CMPZ5239B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5239B TR PBFREE is a surface mount Zener diode manufactured by Central Semiconductor Corp, rated at 9.1 V nominal with 350 mW maximum power dissipation in a SOT-23 package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when alternative manufacturers' specifications better align with specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 7 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	-
RoHS Status	ROHS3 Compliant	-
MSL	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the CMPZ5239B TR PBFREE is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 9.1 V (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Operating Temperature Range: Must encompass or match -65°C ~ 150°C
RoHS Status: ROHS3 Compliant (regulatory requirement)

Secondary Compatibility Parameters:

Power - Max: 350 mW or greater (equal or higher rating acceptable)
Tolerance: ±5% or tighter (equal or better tolerance acceptable)
Impedance (Max): 10 Ohms or lower (equal or lower impedance acceptable)
Current - Reverse Leakage: 3 µA @ 7 V or lower (equal or lower leakage acceptable)
Voltage - Forward (Vf): 900 mV @ 10 mA or lower (equal or lower forward voltage acceptable)

All substitute parts listed maintain the 9.1 V nominal Zener voltage and SOT-23 package configuration. Variations in power rating, tolerance, and impedance are noted where they differ from the main part specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt Max (Ohms)	Ir @ Vr (µA)	Vf Max @ If (mV)	Temp Range (°C)	Package	Product Status
CMPZ5239B TR PBFREE	Central Semiconductor Corp	9.1	±5%	350	10	3 @ 7V	900 @ 10mA	-65 ~ 150	SOT-23	Active
BZX84-A9V1,215	Nexperia USA Inc.	9.1	±1%	250	15	500nA @ 6V	900 @ 10mA	-65 ~ 150	TO-236AB	Active
BZX84-B9V1,215	NXP USA Inc.	9.1	±2%	250	15	500nA @ 6V	900 @ 10mA	-65 ~ 150	SOT-23	Active
BZX84-C9V1,215	Nexperia USA Inc.	9.1	±5%	250	15	500nA @ 6V	900 @ 10mA	-65 ~ 150	TO-236AB	Active
BZX84-C9V1,235	Nexperia USA Inc.	9.1	±5%	250	15	500nA @ 6V	900 @ 10mA	-65 ~ 150	TO-236AB	Active
BZX84B9V1-E3-08	Vishay General Semiconductor - Diodes Division	9.1	±2%	300	15	500nA @ 6V	Not specified	-55 ~ 150	SOT-23-3	Active
BZX84B9V1-E3-18	Vishay General Semiconductor - Diodes Division	9.1	±2%	300	15	500nA @ 6V	Not specified	-55 ~ 150	SOT-23-3	Active
BZX84C9V1-7-F	Diodes Incorporated	9.1	±6%	350	15	500nA @ 6V	900 @ 10mA	-65 ~ 150	SOT-23-3	Active
BZX84C9V1-HE3-18	Vishay General Semiconductor - Diodes Division	9.1	±5%	300	15	500nA @ 6V	Not specified	-55 ~ 150	SOT-23-3	Obsolete
BZX84C9V1-TP	Micro Commercial Co	9.1	±5%	350	15	500nA @ 6V	900 @ 10mA	-55 ~ 150	SOT-23	Active
MMBZ5239B_R1_00001	Panjit International Inc.	9.1	±5%	410	10	3 @ 6.5V	Not specified	-55 ~ 150	SOT-23	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Highest Compatibility):

BZX84C9V1-7-F (Diodes Incorporated) and BZX84C9V1-TP (Micro Commercial Co) are the most direct substitutes. Both maintain the 9.1 V nominal voltage, 350 mW power rating, SOT-23 package, and -65°C to -55°C minimum operating temperature range. Both are Active product status with ROHS3 compliance. The BZX84C9V1-7-F offers AEC-Q101 automotive qualification, which the main part does not specify.

MMBZ5239B_R1_00001 (Panjit International Inc.) provides superior power handling at 410 mW and matches the 10 Ohm impedance specification of the main part. Operating temperature minimum is -55°C versus -65°C for the main part. Active product status and ROHS3 compliant.

Tier 2 - Acceptable Substitutes (Reduced Power Rating):

BZX84-C9V1,215 and BZX84-C9V1,235 (Nexperia USA Inc.) both provide 9.1 V nominal voltage with ±5% tolerance matching the main part. Power rating is reduced to 250 mW. Both maintain -65°C to 150°C operating range and ROHS3 compliance. Active product status. Suitable for applications where 250 mW power dissipation is sufficient.

BZX84-B9V1,215 (NXP USA Inc.) offers 9.1 V nominal with ±2% tolerance (tighter than main part). Power rating is 250 mW. Operating range -65°C to 150°C. Active product status with AEC-Q101 automotive qualification. Suitable where tighter tolerance is beneficial and power requirement is ≤250 mW.

Tier 3 - Limited Substitutes (Temperature or Power Constraints):

BZX84B9V1-E3-08 and BZX84B9V1-E3-18 (Vishay General Semiconductor - Diodes Division) provide 9.1 V nominal with ±2% tolerance and 300 mW power rating. Operating temperature minimum is -55°C (versus -65°C for main part). Both are Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Suitable for applications with -55°C minimum temperature requirement.

BZX84-A9V1,215 (Nexperia USA Inc.) offers the tightest tolerance at ±1% with 9.1 V nominal. Power rating is 250 mW. Operating range -65°C to 150°C. Active product status with AEC-Q101 automotive qualification. Suitable where tolerance specification is critical and power requirement is ≤250 mW.

Not Recommended:

BZX84C9V1-HE3-18 (Vishay General Semiconductor - Diodes Division) is marked as Obsolete product status and should not be selected for new designs or long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower power rating than the main part?

A: Substitution with lower power rating is acceptable only if your application's actual power dissipation does not exceed the substitute part's maximum rating. The main part is rated 350 mW. Substitutes rated 250 mW or 300 mW are suitable for applications dissipating ≤250 mW or ≤300 mW respectively. Exceeding the substitute part's power rating will result in device failure.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates the Zener voltage will be within 8.645 V to 9.555 V at the specified test current. Substitutes with tighter tolerance (±1%, ±2%) will have narrower voltage ranges and are interchangeable. Substitutes with looser tolerance (±6%) are also acceptable as they encompass the ±5% range. Tolerance selection depends on your circuit's voltage regulation requirements.

Q: Are all listed substitutes compatible with the SOT-23 package?

A: All listed substitutes use the TO-236-3, SC-59, or SOT-23-3 package designation, which are mechanically and electrically equivalent. These designations refer to the same 3-lead surface mount package with identical pin configuration and footprint. PCB layout and assembly processes require no modification.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts bearing this qualification have undergone additional reliability testing and are approved for automotive applications. The main part does not specify AEC-Q101 qualification. Several substitutes (BZX84-A9V1,215, BZX84-B9V1,215, BZX84C9V1-7-F, BZX84C9V1-HE3-18) include this qualification, making them suitable for automotive designs if required.

Q: Why do some substitutes have different reverse leakage current specifications?

A: Reverse leakage current varies by manufacturer process and test conditions. The main part specifies 3 µA @ 7 V. Most substitutes specify 500 nA @ 6 V, which is significantly lower. Lower reverse leakage is beneficial for circuit performance and is acceptable as a substitute. The difference in test voltage (7 V vs. 6 V) reflects different manufacturer measurement standards but does not affect interchangeability.

Q: Can I use a substitute with a higher impedance rating?

A: The main part specifies 10 Ohms maximum impedance. Most substitutes specify 15 Ohms maximum impedance. Higher impedance is acceptable and does not prevent substitution. Impedance affects the Zener diode's dynamic response characteristics. For most applications, the difference between 10 Ohms and 15 Ohms is negligible. Applications requiring precise dynamic impedance specifications should verify the substitute's performance through circuit simulation or testing.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) supplies components on tape segments, suitable for lower-volume or manual assembly. Both contain identical components; the difference is in the delivery format. Select based on your assembly process requirements and volume.

Q: Is the MMBZ5239B_R1_00001 a better choice than the main part?

A: The MMBZ5239B_R1_00001 offers higher power rating (410 mW vs. 350 mW) and matches the impedance specification (10 Ohms). However, its operating temperature minimum is -55°C versus -65°C for the main part. If your application operates above -55°C and benefits from higher power handling, this part is superior. If your application requires -65°C operation, the main part or other substitutes with -65°C minimum are required.

Q: Are all listed parts ROHS3 compliant?

A: Yes, all listed parts including the main part are ROHS3 compliant. ROHS3 compliance indicates the parts are free from restricted substances (lead, cadmium, mercury, hexavalent chromium, PBB, PBDE) and meet environmental regulations for electronic components.

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