CMPZ5263B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5263B TR PBFREE is a 56 V Zener diode manufactured by Central Semiconductor Corp, rated at 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active product status and is ROHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits in electronic systems. Substitute parts may be required due to supply chain constraints, inventory availability, or design optimization for specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	56	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	150	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 43 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-65°C to 150°C	—
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CMPZ5263B TR PBFREE is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 56 V nominal
Package type: SOT-23-3 / TO-236-3 / SC-59 (surface mount, three-terminal)
Operating temperature range: minimum -55°C to 150°C
RoHS3 compliance and MSL rating

Allowable Variation Parameters:

Power rating: 225 mW to 350 mW (substitute parts may have lower power ratings if application requirements permit)
Tolerance: ±2% to ±7% (tolerance variation is acceptable within design margin)
Impedance: 150 to 200 Ohms (within acceptable range for voltage regulation applications)
Reverse leakage current: 50 nA to 100 nA (minor variation acceptable)

All substitute parts listed maintain the 56 V zener voltage specification and SOT-23 package form factor, ensuring mechanical and electrical compatibility with the original CMPZ5263B TR PBFREE design.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vr Leakage	Operating Temp	Package	Status
CMPZ5263B TR PBFREE	Central Semiconductor Corp	56 V	±5%	350 mW	150 Ω	100 nA @ 43 V	-65°C to 150°C	SOT-23-3	Active
BZX84-B56,215	NXP USA Inc.	56 V	±2%	250 mW	200 Ω	50 nA @ 39.2 V	-65°C to 150°C	SOT-23-3	Active
BZX84-C56,215	Nexperia USA Inc.	56 V	±5%	250 mW	200 Ω	50 nA @ 39.2 V	-65°C to 150°C	SOT-23-3	Active
BZX84B56-E3-08	Vishay General Semiconductor	56 V	±2%	300 mW	200 Ω	50 nA @ 39.2 V	-55°C to 150°C	SOT-23-3	Active
BZX84C56-E3-08	Vishay General Semiconductor	56 V	±7%	300 mW	200 Ω	50 nA @ 39.2 V	-55°C to 150°C	SOT-23-3	Active
BZX84C56LT1G	onsemi	56 V	±7%	225 mW	200 Ω	50 nA @ 39.2 V	-65°C to 150°C	SOT-23-3	Active
MMBZ5263BLT1G	onsemi	56 V	±5%	225 mW	150 Ω	100 nA @ 43 V	-65°C to 150°C	SOT-23-3	Active
SZBZX84C56LT1G	onsemi	56 V	±7%	225 mW	200 Ω	50 nA @ 39.2 V	-65°C to 150°C	SOT-23-3	Active
SZMMBZ5263BLT1G	onsemi	56 V	±5%	225 mW	150 Ω	100 nA @ 43 V	-65°C to 150°C	SOT-23-3	Active
SZMMBZ5263ELT1G	onsemi	56 V	±5%	225 mW	150 Ω	100 nA @ 43 V	-55°C to 150°C	SOT-23-3	Last Time Buy

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MMBZ5263BLT1G and SZMMBZ5263BLT1G are the closest electrical equivalents to the CMPZ5263B TR PBFREE. Both parts maintain identical zener voltage (56 V), tolerance (±5%), impedance (150 Ω), and reverse leakage characteristics (100 nA @ 43 V). Operating temperature range extends to -65°C, matching the original specification. SZMMBZ5263BLT1G carries AEC-Q101 automotive qualification, providing additional reliability assurance for demanding applications.

Secondary Substitutes (Acceptable with Design Verification):

BZX84-C56,215 (Nexperia) and BZX84-B56,215 (NXP) maintain the 56 V zener voltage and SOT-23 package. Both carry AEC-Q101 automotive qualification. Power rating is reduced to 250 mW, and impedance increases to 200 Ω. These parts are suitable for applications where the original 350 mW power rating is not fully utilized.

BZX84B56-E3-08 and BZX84C56-E3-08 (Vishay) offer 300 mW power rating with 200 Ω impedance. Operating temperature minimum is -55°C, which is acceptable for most commercial and industrial applications. Tolerance varies between ±2% and ±7%.

Tertiary Substitutes (Lower Power Rating):

BZX84C56LT1G, SZBZX84C56LT1G, and SZMMBZ5263ELT1G are rated at 225 mW maximum power. These parts are suitable only for applications where power dissipation does not exceed 225 mW. SZMMBZ5263ELT1G is designated Last Time Buy status and should be avoided for new designs.

Compliance Status:

All listed substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original CMPZ5263B TR PBFREE compliance profile. All parts maintain surface mount SOT-23-3 package compatibility.

Frequently Asked Questions (FAQ)

Q1: Can I substitute a 225 mW rated zener diode for the 350 mW CMPZ5263B TR PBFREE?

A: Substitution is permissible only if the application circuit dissipates no more than 225 mW in the zener diode. The zener voltage (56 V) and package form factor (SOT-23-3) remain compatible. If the original design requires the full 350 mW capability, lower-power substitutes are not suitable. Verify circuit power dissipation calculations before selection.

Q2: What is the difference between BZX84-B56,215 and BZX84-C56,215?

A: Both parts are 56 V zener diodes in SOT-23 package from different manufacturers (NXP and Nexperia respectively). The primary difference is tolerance: BZX84-B56,215 specifies ±2% tolerance, while BZX84-C56,215 specifies ±5% tolerance. Both are rated at 250 mW and carry AEC-Q101 automotive qualification. Selection depends on tolerance requirements for the application.

Q3: Are automotive-qualified parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive and high-reliability applications. SZBZX84C56LT1G and SZMMBZ5263BLT1G carry this qualification. For general industrial or consumer applications, non-qualified parts such as BZX84C56LT1G are acceptable. Verify application requirements before specifying automotive-grade components.

Q4: Why do some substitute parts have different operating temperature ranges?

A: Operating temperature range is a manufacturing specification that varies by supplier. The original CMPZ5263B TR PBFREE specifies -65°C to 150°C. Substitute parts from Vishay (BZX84B56-E3-08, BZX84C56-E3-08) specify -55°C to 150°C, which is acceptable for most applications. SZMMBZ5263ELT1G specifies -55°C to 150°C. Verify that the substitute part's temperature range meets application requirements before selection.

Q5: What does "Last Time Buy" status mean for SZMMBZ5263ELT1G?

A: Last Time Buy status indicates that the manufacturer will discontinue production of this part. While currently available in inventory (38,200 pcs), this part should not be selected for new designs. Use SZMMBZ5263BLT1G (Active status) as the preferred alternative instead.

Q6: Can I use parts with different impedance values (150 Ω vs. 200 Ω)?

A: Impedance variation between 150 Ω and 200 Ω is acceptable for most voltage regulation and protection applications. Impedance affects the dynamic response of the zener diode under transient conditions. If the original design is sensitive to impedance characteristics, verify circuit performance with the substitute part's impedance value before final selection.

Q7: Is the SOT-23 package the same across all substitute parts?

A: Yes. All listed substitute parts use the SOT-23-3 package, also designated as TO-236-3 or SC-59. This package is mechanically and electrically compatible across all manufacturers. PCB footprints and soldering procedures remain identical.

Q8: What is the significance of reverse leakage current variation (50 nA vs. 100 nA)?

A: Reverse leakage current affects the standby power consumption and precision of voltage regulation circuits. The original CMPZ5263B TR PBFREE specifies 100 nA @ 43 V. Substitute parts with 50 nA @ 39.2 V have lower leakage, which is beneficial for low-power applications. This variation is acceptable and does not compromise compatibility.

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