CMPZ5237B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5237B TR PBFREE is an 8.2 V Zener diode manufactured by Central Semiconductor Corp, rated for 350 mW power dissipation in a surface mount SOT-23 package. This component is classified as Active and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). The part is widely used in voltage regulation and protection circuits requiring precise 8.2 V reference voltage.

Substitute parts are necessary when the original CMPZ5237B TR PBFREE becomes unavailable, when alternative manufacturers offer improved specifications, or when design requirements necessitate different electrical characteristics within the same functional category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	8.2	V
Tolerance	±5%	-
Power - Maximum	350	mW
Impedance (Maximum)	8	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6.5 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
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	-

Substitute Part Grouping Explanation

Substitution eligibility for the CMPZ5237B TR PBFREE is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 8.2 V (nominal)
Package type: SOT-23-3 / TO-236-3 / SC-59 (identical physical footprint)
Mounting type: Surface Mount
Operating temperature range: Must encompass or match -65°C to 150°C
RoHS compliance: ROHS3 Compliant

Secondary Compatibility Parameters:

Voltage tolerance: ±5% or tighter (±1%, ±2%, ±6% acceptable)
Power rating: 250 mW minimum (original is 350 mW; lower ratings acceptable in applications with reduced power requirements)
Impedance: 8 to 15 Ohms (original is 8 Ohms; higher impedance acceptable within specified range)
Reverse leakage current: 700 nA to 3 µA @ specified voltage
Forward voltage: 900 mV @ 10 mA (consistent across all candidates)

Substitute parts must maintain identical zener voltage and package configuration. Variations in power rating, impedance, and tolerance are acceptable provided the application circuit design accommodates these differences.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr	Temp Range (°C)	Status
CMPZ5237B TR PBFREE	Central Semiconductor Corp	8.2	±5%	350	8	3 µA @ 6.5V	-65 to 150	Active
BZX84-A8V2,215	Nexperia USA Inc.	8.2	±1%	250	15	700 nA @ 5V	-65 to 150	Active
BZX84-C8V2,215	Nexperia USA Inc.	8.2	±5%	250	15	700 nA @ 5V	-65 to 150	Active
BZX84-C8V2,235	Nexperia USA Inc.	8.2	±5%	250	15	700 nA @ 5V	-65 to 150	Active
BZX84B8V2-TP	Micro Commercial Co	8.2	±2%	350	15	700 nA @ 5V	-55 to 150	Active
BZX84B8V2LT1G	onsemi	8.2	±2%	225	15	700 nA @ 5V	-65 to 150	Active
BZX84C8V2-7-F	Diodes Incorporated	8.2	±6%	300	15	700 nA @ 5V	-65 to 150	Active
BZX84C8V2-E3-08	Vishay General Semiconductor	8.2	±5%	300	15	700 nA @ 5V	-55 to 150	Active
BZX84C8V2-HE3-08	Vishay General Semiconductor	8.2	±5%	300	15	700 nA @ 5V	-55 to 150	Obsolete
BZX84C8V2-HE3-18	Vishay General Semiconductor	8.2	±5%	300	15	700 nA @ 5V	-55 to 150	Obsolete
BZX84C8V2-TP	Micro Commercial Co	8.2	±5%	350	15	700 nA @ 5V	-55 to 150	Active

Engineering Selection Recommendations

Preferred Active Substitutes (Recommended for New Designs):

BZX84C8V2-TP (Micro Commercial Co): Matches original power rating (350 mW) and voltage tolerance (±5%). Operating temperature range -55°C to 150°C is acceptable for most applications. Active product status ensures long-term availability.
BZX84B8V2-TP (Micro Commercial Co): Provides tighter voltage tolerance (±2%) with identical 350 mW power rating. Operating temperature minimum of -55°C is suitable for standard industrial applications. Active status.
BZX84C8V2-7-F (Diodes Incorporated): Offers 300 mW power rating with ±6% tolerance. Suitable for applications with moderate power requirements. High inventory availability (62,400 pcs). Active status.
BZX84-C8V2,215 and BZX84-C8V2,235 (Nexperia USA Inc.): Both feature ±5% tolerance matching the original specification. Reduced power rating (250 mW) requires circuit verification. Automotive-grade with AEC-Q101 qualification. Active status with high inventory.

Conditional Substitutes (Verify Application Requirements):

BZX84B8V2LT1G (onsemi): Lower power rating (225 mW) requires confirmation that application circuit can operate within this limit. Tighter tolerance (±2%) and full temperature range (-65°C to 150°C) are advantageous. Active status.
BZX84-A8V2,215 (Nexperia USA Inc.): Tightest tolerance (±1%) available. Reduced power rating (250 mW) and higher impedance (15 Ohms) require circuit compatibility verification. Automotive-grade, AEC-Q101 qualified. Active status.

Not Recommended for New Designs:

BZX84C8V2-HE3-08 and BZX84C8V2-HE3-18 (Vishay): Both marked as Obsolete. Use only for legacy system maintenance or repair where original part specifications are mandatory.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Nexperia and Vishay parts carry AEC-Q101 automotive qualification, providing additional reliability assurance for critical applications.

Frequently Asked Questions (FAQ)

Q1: Can I substitute BZX84C8V2-TP for CMPZ5237B TR PBFREE without circuit modification?

A: Yes. BZX84C8V2-TP maintains identical zener voltage (8.2 V), voltage tolerance (±5%), power rating (350 mW), and SOT-23 package. The only difference is impedance (15 Ohms vs. 8 Ohms original), which is acceptable in most voltage regulation and protection circuits. Verify impedance impact in high-frequency or precision applications.

Q2: What is the difference between BZX84-A8V2,215 and BZX84-C8V2,215?

A: Both are manufactured by Nexperia in identical SOT-23 packages with 8.2 V zener voltage. The primary difference is voltage tolerance: BZX84-A8V2,215 specifies ±1% (tighter), while BZX84-C8V2,215 specifies ±5% (matching the original CMPZ5237B). Both have reduced power rating (250 mW vs. 350 mW original). Select based on tolerance requirements and application power budget.

Q3: Why do some substitutes have lower power ratings (225 mW, 250 mW, 300 mW) compared to the original 350 mW?

A: Lower power ratings indicate reduced maximum power dissipation capability. These parts are suitable for applications with lower current demands or where thermal management is less critical. Verify that your circuit's maximum power dissipation does not exceed the substitute part's rating. If original 350 mW rating is mandatory, select BZX84B8V2-TP or BZX84C8V2-TP.

Q4: Are Nexperia BZX84 parts automotive-qualified?

A: Yes. BZX84-A8V2,215, BZX84-C8V2,215, and BZX84-C8V2,235 all carry AEC-Q101 automotive qualification and are designated as Automotive grade. These parts meet stringent reliability and temperature cycling requirements for automotive applications.

Q5: Can I use BZX84B8V2LT1G if my application requires -65°C minimum operating temperature?

A: Yes. BZX84B8V2LT1G specifies operating temperature range -65°C to 150°C, matching the original CMPZ5237B. However, verify that the reduced power rating (225 mW) is acceptable for your circuit. This part offers the advantage of tighter voltage tolerance (±2%).

Q6: What does "Obsolete" status mean for BZX84C8V2-HE3-08 and BZX84C8V2-HE3-18?

A: Obsolete status indicates these parts are no longer in active production. While inventory may still be available (2,134 and 10,784 pcs respectively), future availability is not guaranteed. Use only for repair or maintenance of existing systems where original specifications are critical. For new designs, select Active-status alternatives.

Q7: Is impedance (Zzt) a critical parameter for substitution?

A: Impedance affects voltage regulation quality and transient response. The original CMPZ5237B specifies 8 Ohms, while most substitutes specify 15 Ohms. In standard voltage regulation circuits, this difference is acceptable. In precision reference or high-frequency applications, verify impedance impact through circuit simulation or testing.

Q8: Do all substitute parts have identical forward voltage characteristics?

A: Yes. All listed substitutes specify forward voltage of 900 mV @ 10 mA, matching the original CMPZ5237B. This parameter is consistent across all manufacturers and variants.

Q9: Which substitute offers the best availability?

A: BZX84C8V2-7-F (Diodes Incorporated) has the highest inventory at 62,400 pcs. BZX84-C8V2,235 (Nexperia) follows with 21,488 pcs. Both are Active products with excellent long-term availability prospects.

Q10: Can I mix different substitute parts in the same circuit board design?

A: Yes, provided all selected substitutes meet your circuit's electrical requirements (voltage, power, tolerance, impedance). Using multiple qualified substitutes provides supply chain flexibility and reduces single-source dependency. Ensure all parts are qualified for your operating temperature range and compliance requirements.

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