CMPZ5246B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5246B TR PBFREE is a 16 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 and RoHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits. Substitute parts may be required due to supply chain constraints, manufacturing discontinuation, or design optimization for specific applications while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12 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	-
MSL	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the CMPZ5246B TR PBFREE is determined by the following critical parameters:

Primary Compatibility Criteria:

Zener voltage: 16 V nominal
Package type: SOT-23-3 / TO-236-3 / SC-59 (surface mount, identical pinout)
Maximum power rating: equal to or greater than 350 mW
Operating temperature range: minimum -65°C to 150°C
RoHS3 compliance and MSL rating

Secondary Compatibility Criteria:

Tolerance: ±5% or tighter acceptable
Impedance: 17 Ohms or lower acceptable
Reverse leakage current: 100 nA @ 12 V or lower acceptable
Forward voltage: 900 mV @ 10 mA or lower acceptable

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (SOT-23-3 Package): Parts maintaining identical package, pinout, and power rating specifications. These include BZX84B16LT1G, BZX84C16-7-F, BZX84C16-E3-08, and BZX84C16-E3-18.

Category B - Reduced Power Rating Substitutes (SOT-23-3 Package): Parts with lower maximum power dissipation (250-300 mW) but meeting all other electrical specifications. These include BZX84-B16,215, BZX84-C16,215, BZX84-C16,235, and BZX84B16-E3-08. These are suitable for applications where the full 350 mW rating is not required.

Category C - Array Configuration (Non-Equivalent): MMBZ5246BS-7-F is a 2-independent Zener array in SOT-363 package. This part is not a direct substitute due to different package type and configuration, though it contains equivalent Zener elements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Package	Status	RoHS3
CMPZ5246B TR PBFREE	Central Semiconductor	16	±5%	350	17	100 @ 12V	SOT-23-3	Active	Yes
BZX84B16LT1G	onsemi	16	±2%	250	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84C16-7-F	Diodes Incorporated	16	±6%	300	40	100 @ 11.2V	SOT-23-3	Active	Yes
BZX84C16-E3-08	Vishay	16	±5%	300	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84C16-E3-18	Vishay	16	±5%	300	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84B16-E3-08	Vishay	16	±2%	300	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84-B16,215	NXP Semiconductors	16	±2%	250	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84-C16,215	Nexperia USA Inc.	16	±5%	250	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84-C16,235	Nexperia USA Inc.	16	±5%	250	40	50 @ 11.2V	SOT-23-3	Active	Yes
BZX84B16-HE3-08	Vishay	16	±2%	300	40	50 @ 11.2V	SOT-23-3	Obsolete	Yes
MMBZ5246BS-7-F	Diodes Incorporated	16	±5%	200	17	100 @ 12V	SOT-363	Active	Yes

Engineering Selection Recommendations

For Direct Substitution (Identical Electrical Performance):

BZX84C16-7-F (Diodes Incorporated) and BZX84C16-E3-08 (Vishay) are the primary recommended substitutes. Both maintain 300 mW power rating, 16 V nominal Zener voltage, SOT-23-3 package compatibility, and Active product status. BZX84C16-E3-08 offers superior reverse leakage characteristics (50 nA vs. 100 nA) and is preferred for precision applications.

For Applications with Reduced Power Requirements:

BZX84B16LT1G (onsemi), BZX84-B16,215 (NXP), and BZX84-C16,215 (Nexperia) are suitable where circuit design permits 250 mW operation. These parts offer tighter tolerance (±2%) and lower impedance (40 Ohms), providing improved voltage regulation stability. All three maintain Active status and full RoHS3 compliance.

For Automotive Applications:

BZX84-B16,215 and BZX84-C16,215 carry AEC-Q101 automotive qualification. These parts are specified for automotive-grade reliability and are recommended for applications requiring automotive component certification.

Parts to Avoid:

BZX84B16-HE3-08 is marked Obsolete and should not be selected for new designs, despite technical compatibility.

MMBZ5246BS-7-F is not recommended as a direct substitute due to SOT-363 package incompatibility with SOT-23-3 footprints and array configuration (2 independent Zeners vs. single diode).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower power rating (250 mW instead of 350 mW)?

A: Yes, if your circuit design does not require the full 350 mW dissipation capability. Verify that the maximum power dissipation in your application does not exceed 250 mW. Lower-rated parts (BZX84B16LT1G, BZX84-B16,215, BZX84-C16,215) are electrically compatible and maintain the same 16 V Zener voltage and SOT-23-3 package.

Q: Are all substitute parts pin-compatible with the CMPZ5246B TR PBFREE?

A: All substitute parts listed except MMBZ5246BS-7-F are pin-compatible. They all use the SOT-23-3 / TO-236-3 / SC-59 package with identical pinout. MMBZ5246BS-7-F uses SOT-363 package and is not pin-compatible.

Q: What is the difference between ±2% and ±5% tolerance specifications?

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 16 V value. ±2% tolerance (BZX84B16LT1G, BZX84-B16,215, BZX84B16-E3-08) provides tighter voltage regulation with maximum deviation of ±0.32 V. ±5% tolerance (CMPZ5246B, BZX84C16-7-F, BZX84C16-E3-08) allows ±0.8 V deviation. Select ±2% parts for precision voltage reference applications.

Q: Can I use BZX84B16-HE3-08 as a substitute?

A: BZX84B16-HE3-08 is marked Obsolete and should not be used for new designs. Although electrically compatible, obsolete parts present supply chain risk and may not meet current manufacturing standards.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitute parts are RoHS3 compliant, ensuring compatibility with modern electronics manufacturing standards and environmental regulations.

Q: Is MMBZ5246BS-7-F a suitable substitute?

A: MMBZ5246BS-7-F is not a direct substitute. Although it contains 16 V Zener elements, it is configured as a 2-independent Zener array in SOT-363 package. This package is physically and electrically incompatible with SOT-23-3 footprints. Use only if your PCB design specifically accommodates SOT-363 package and requires dual Zener functionality.

Q: Which substitute offers the best reverse leakage performance?

A: BZX84-B16,215, BZX84-C16,215, BZX84C16-E3-08, BZX84B16-E3-08, and BZX84B16-HE3-08 all specify 50 nA reverse leakage at 11.2 V, compared to 100 nA for the original CMPZ5246B. Lower reverse leakage reduces standby current consumption and is preferred for battery-powered applications.

Q: Are there automotive-qualified alternatives?

A: Yes. BZX84-B16,215 and BZX84-C16,215 both carry AEC-Q101 automotive qualification. These parts are recommended for automotive applications requiring certified component reliability and traceability.

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