CMPZ5243B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5243B TR PBFREE is a 13 V Zener diode manufactured by Central Semiconductor Corp, rated for 350 mW power dissipation with ±5% voltage tolerance. This surface mount component in SOT-23 packaging is designed for voltage regulation and protection applications in electronic circuits. The part is currently Active in product status with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when design specifications allow for compatible alternatives from qualified manufacturers. The following equivalent parts maintain the core electrical characteristics while offering variations in power rating, tolerance, and manufacturer qualifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Tolerance	±5%	-
Power - Maximum	350	mW
Impedance (Maximum)	13	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 9.9 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	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the CMPZ5243B TR PBFREE is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 13 V (nominal)
Package type: TO-236-3, SC-59, or SOT-23-3 (surface mount)
Mounting type: Surface Mount
Operating temperature range: Must support -65°C to 150°C minimum
RoHS3 compliance required
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Power rating: 250 mW to 350 mW acceptable
Voltage tolerance: ±1% to ±6% acceptable
Impedance (Maximum): 13 to 30 Ohms acceptable
Reverse leakage current: 100 to 500 nA acceptable
Forward voltage: 900 mV @ 10 mA

Substitute parts are grouped by manufacturer and tolerance grade. Parts with lower power ratings (250 mW) are suitable for applications where the original 350 mW rating exceeds design requirements. Parts with tighter tolerance (±1% to ±2%) provide enhanced voltage regulation precision. Parts with automotive qualification (AEC-Q101) are suitable for automotive and high-reliability applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Temp Range (°C)	Package	Status	AEC-Q101
CMPZ5243B TR PBFREE	Central Semiconductor Corp	13	±5%	350	13	900	-65 to 150	SOT-23	Active	-
BZX84-A13,215	Nexperia USA Inc.	13	±1%	250	30	900	-65 to 150	TO-236AB	Active	Yes
BZX84-B13,215	NXP Semiconductors	13	±2%	250	30	900	-65 to 150	TO-236AB	Active	Yes
BZX84-B13,235	Nexperia USA Inc.	13	±2%	250	30	900	-65 to 150	TO-236AB	Active	Yes
BZX84-C13,215	Nexperia USA Inc.	13	±5%	250	30	900	-65 to 150	TO-236AB	Active	Yes
BZX84-C13,235	NXP Semiconductors	13	±5%	250	30	900	-65 to 150	TO-236AB	Active	Yes
BZX84B13-E3-08	Vishay General Semiconductor	13	±2%	300	30	-	-55 to 150	SOT-23-3	Active	-
BZX84B13-HE3-08	Vishay General Semiconductor	13	±2%	300	30	-	-55 to 150	SOT-23-3	Obsolete	Yes
BZX84C13-7-F	Diodes Incorporated	13	±6%	300	30	900	-65 to 150	SOT-23-3	Active	Yes
BZX84C13-E3-08	Vishay General Semiconductor	13	±5%	300	30	-	-55 to 150	SOT-23-3	Active	-
BZX84C13-TP	Micro Commercial Co	13	±5%	350	30	900	-55 to 150	SOT-23	Active	-

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): BZX84C13-TP from Micro Commercial Co is the closest functional equivalent, offering identical 13 V nominal voltage, ±5% tolerance, and 350 mW power rating. This part maintains the same electrical performance envelope as the CMPZ5243B TR PBFREE while providing an alternative source.

For Automotive and High-Reliability Applications: Parts with AEC-Q101 qualification are suitable for automotive-grade applications: BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, BZX84-C13,235, BZX84B13-HE3-08, and BZX84C13-7-F. These parts meet automotive qualification standards while maintaining 13 V zener voltage and compatible packaging.

For Enhanced Voltage Regulation Precision: BZX84-A13,215 offers ±1% tolerance, providing tighter voltage regulation compared to the ±5% specification of the original part. This part is suitable for applications requiring enhanced voltage stability.

For Standard Industrial Applications: BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, and BZX84-C13,235 from Nexperia/NXP provide 250 mW power rating with ±2% or ±5% tolerance. These parts are suitable for applications where the original 350 mW rating exceeds design requirements.

Parts to Avoid: BZX84B13-HE3-08 is marked as Obsolete and should not be selected for new designs, despite AEC-Q101 qualification.

Temperature Range Consideration: BZX84B13-E3-08, BZX84B13-HE3-08, and BZX84C13-E3-08 specify -55°C to 150°C operating range, which does not meet the -65°C minimum requirement of the original part. These parts are suitable only for applications with -55°C minimum temperature requirement.

Frequently Asked Questions (FAQ)

Q: Can I use a 250 mW rated substitute in place of the 350 mW original part? A: Yes, if your circuit design does not require the full 350 mW power dissipation capability. The 250 mW parts (BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, BZX84-C13,235) are suitable for applications with lower power requirements. Verify that your circuit's maximum power dissipation does not exceed 250 mW.

Q: What is the difference between ±1%, ±2%, ±5%, and ±6% tolerance ratings? A: Tolerance indicates the allowable deviation from the nominal 13 V zener voltage. ±1% tolerance (BZX84-A13,215) provides the tightest voltage regulation, while ±6% tolerance (BZX84C13-7-F) allows the widest deviation. Select based on your circuit's voltage regulation requirements. Tighter tolerance parts are suitable for precision voltage reference applications.

Q: Are all substitute parts RoHS3 compliant? A: Yes, all listed substitute parts are RoHS3 compliant, matching the original CMPZ5243B TR PBFREE specification.

Q: Can I use parts with -55°C minimum temperature in place of the original -65°C minimum part? A: No, if your application requires operation at temperatures below -55°C. Parts BZX84B13-E3-08, BZX84B13-HE3-08, and BZX84C13-E3-08 specify -55°C minimum and are not suitable for applications requiring -65°C operation. Use parts with -65°C minimum specification: CMPZ5243B TR PBFREE, BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, BZX84-C13,235, or BZX84C13-7-F.

Q: What does AEC-Q101 qualification mean? A: AEC-Q101 is an automotive qualification standard for discrete semiconductors. Parts with this qualification have undergone rigorous testing for automotive applications and are suitable for use in automotive and high-reliability environments. BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, BZX84-C13,235, BZX84B13-HE3-08, and BZX84C13-7-F carry this qualification.

Q: Is the impedance difference between 13 Ohms and 30 Ohms significant? A: The impedance difference affects the dynamic response of the zener diode. The original part specifies 13 Ohms maximum impedance, while most substitutes specify 30 Ohms. Lower impedance provides faster transient response. For applications requiring the original 13 Ohms impedance specification, only CMPZ5243B TR PBFREE meets this requirement. For standard voltage regulation applications, 30 Ohms impedance is acceptable.

Q: Can I substitute BZX84B13-HE3-08 even though it is marked Obsolete? A: No. Obsolete parts should not be selected for new designs. While BZX84B13-HE3-08 is currently in stock, its obsolete status indicates that the manufacturer has discontinued production. Select Active status parts for new designs: BZX84-A13,215, BZX84-B13,215, BZX84-B13,235, BZX84-C13,215, BZX84-C13,235, BZX84B13-E3-08, BZX84C13-7-F, BZX84C13-E3-08, or BZX84C13-TP.

Q: What is the difference between Tape & Reel (TR), Cut Tape (CT), and Bulk packaging? A: Packaging format affects component handling and assembly. Tape & Reel (TR) is standard for automated assembly equipment. Cut Tape (CT) & Digi-Reel is suitable for smaller quantities and manual assembly. Bulk packaging is used for large volume orders. All three formats contain identical components; packaging selection depends on your assembly process and order quantity requirements.

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