BZX84C11 TR Equivalent & Substitute Parts

Part Overview

The BZX84C11 TR is a Zener diode manufactured by Central Semiconductor Corp, rated at 11 V nominal Zener voltage with 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 8 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	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the BZX84C11 TR is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): Must equal 11 V
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3 compatible
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass or match -65°C ~ 150°C or -55°C ~ 150°C
RoHS Status: Must be ROHS3 Compliant

Secondary Compatibility Parameters:

Tolerance: ±1%, ±2%, or ±5% are acceptable within design margin
Power - Max: 250 mW, 300 mW, or 350 mW are acceptable (higher power ratings provide design margin)
Impedance (Max): 20 Ohms or 22 Ohms are acceptable
Current - Reverse Leakage: 100 nA or 2 µA are acceptable
Voltage - Forward (Vf): 900 mV @ 10 mA is standard across all candidates

Substitute parts are grouped by manufacturer and tolerance grade. All identified substitutes maintain the 11 V Zener voltage specification and SOT-23 package compatibility required for direct circuit board replacement.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Grade
BZX84C11 TR	Central Semiconductor Corp	11 V	±5%	350 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23	Standard
BZX84-A11,215	Nexperia USA Inc.	11 V	±1%	250 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Automotive AEC-Q101
BZX84-B11,215	Nexperia USA Inc.	11 V	±2%	250 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Automotive AEC-Q101
BZX84-B11,235	NXP USA Inc.	11 V	±2%	250 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23	Automotive AEC-Q101
BZX84-C11,215	Nexperia USA Inc.	11 V	±5%	250 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	TO-236AB	Automotive AEC-Q101
BZX84-C11,235	NXP USA Inc.	11 V	±5%	250 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23	Automotive AEC-Q101
BZX84C11-7-F	Diodes Incorporated	11 V	±5%	300 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Standard
BZX84C11-E3-08	Vishay General Semiconductor - Diodes Division	11 V	±5%	300 mW	20 Ω	100 nA @ 8 V	Not specified	-55°C ~ 150°C	SOT-23-3	Standard
BZX84C11-G3-08	Vishay General Semiconductor - Diodes Division	11 V	±5%	300 mW	20 Ω	100 nA @ 8 V	Not specified	-55°C ~ 150°C	SOT-23-3	Standard
MMBZ5241B-7-F	Diodes Incorporated	11 V	±5%	350 mW	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Standard
MMBZ5241BLT1G	onsemi	11 V	±5%	225 mW	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3 (TO-236)	Standard

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BZX84C11-7-F (Diodes Incorporated) and MMBZ5241B-7-F (Diodes Incorporated) are direct substitutes with identical 11 V Zener voltage, ±5% tolerance, SOT-23-3 package, and -65°C ~ 150°C operating temperature range. Both are RoHS3 compliant and maintain 100 nA reverse leakage specification. BZX84C11-7-F provides 300 mW power rating; MMBZ5241B-7-F provides 350 mW power rating matching the original specification.

Automotive-Grade Alternatives:

BZX84-C11,235 (NXP USA Inc.) and BZX84-B11,235 (NXP USA Inc.) are automotive-qualified substitutes with AEC-Q101 certification. Both feature SOT-23 package compatibility and -65°C ~ 150°C operating temperature. BZX84-C11,235 matches the ±5% tolerance of the original part with 250 mW power rating. BZX84-B11,235 provides ±2% tolerance with 250 mW power rating.

Lower Power Rating Alternatives:

BZX84-A11,215, BZX84-B11,215, and BZX84-C11,215 (Nexperia USA Inc.) are automotive-qualified alternatives with TO-236AB package compatibility. These parts feature 250 mW power rating, which is lower than the original 350 mW specification. Selection of these parts requires design verification that 250 mW power dissipation is sufficient for the application.

Vishay Alternatives:

BZX84C11-E3-08 and BZX84C11-G3-08 (Vishay General Semiconductor - Diodes Division) provide 300 mW power rating with SOT-23-3 package. Operating temperature range is -55°C ~ 150°C, which is narrower than the original -65°C ~ 150°C specification. These parts are suitable for applications not requiring the extended low-temperature performance.

Lower Power Alternative:

MMBZ5241BLT1G (onsemi) provides 225 mW power rating, which is lower than the original 350 mW specification. This part features 22 Ohms impedance and 2 µA reverse leakage, differing from the original 20 Ohms and 100 nA specifications. Selection requires design verification of impedance and leakage current tolerance.

Frequently Asked Questions (FAQ)

Q: Can BZX84-C11,235 replace BZX84C11 TR in all applications?

A: BZX84-C11,235 is electrically compatible with matching 11 V Zener voltage, ±5% tolerance, and SOT-23 package. However, the power rating is 250 mW versus the original 350 mW. Substitution is valid only if the application power dissipation does not exceed 250 mW. The part includes automotive AEC-Q101 qualification, which may provide additional reliability assurance for certain applications.

Q: What is the difference between TO-236AB and SOT-23-3 packages?

A: TO-236AB and SOT-23-3 are equivalent package designations for the same physical form factor. Both refer to a three-terminal surface mount package with identical pin configuration and land pattern. Parts specified as TO-236AB or SOT-23-3 are mechanically and electrically interchangeable on the circuit board.

Q: Why do some substitutes have different impedance values (20 Ohms vs. 22 Ohms)?

A: Impedance variation within the specified range reflects manufacturing tolerance and design differences between manufacturers. The MMBZ5241 series specifies 22 Ohms maximum impedance versus 20 Ohms for the BZX84 series. This difference affects dynamic impedance characteristics at high frequencies. For applications sensitive to impedance, verify that 22 Ohms is acceptable within circuit design margins.

Q: Can MMBZ5241BLT1G be used as a substitute despite lower power rating?

A: MMBZ5241BLT1G provides 225 mW power rating, which is lower than the original 350 mW specification. Substitution is valid only if circuit analysis confirms that steady-state and transient power dissipation in the Zener diode does not exceed 225 mW. Additionally, this part specifies 2 µA reverse leakage versus 100 nA in the original part, which may affect circuit performance in applications with tight leakage current requirements.

Q: Are Nexperia and NXP parts interchangeable?

A: Nexperia USA Inc. and NXP USA Inc. parts with identical electrical specifications and package designations are interchangeable. Both manufacturers produce BZX84-C11 series Zener diodes with 11 V rating, ±5% tolerance, and SOT-23 package. Verify part number suffixes (,215 for Tape & Reel; ,235 for Bulk) to confirm packaging format compatibility with procurement and assembly requirements.

Q: What is the significance of AEC-Q101 qualification?

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. Selection of AEC-Q101 qualified parts such as BZX84-C11,235 or BZX84-B11,235 is required for automotive designs or applications with equivalent reliability requirements.

Q: Why is the operating temperature range -55°C ~ 150°C for some Vishay parts versus -65°C ~ 150°C for others?

A: Operating temperature range reflects the manufacturer's tested and qualified performance envelope. BZX84C11-E3-08 and BZX84C11-G3-08 specify -55°C minimum operating temperature, which is 10°C higher than the original -65°C specification. Substitution with these parts is valid only if the application does not require operation below -55°C. For applications requiring -65°C operation, select alternatives with matching temperature range.

Q: Can multiple substitute parts be used interchangeably within a single design?

A: Yes, provided all selected parts meet the minimum electrical and mechanical requirements for the application. However, design practice typically standardizes on a single part number or a small set of approved alternatives to simplify procurement, inventory management, and manufacturing documentation. Consult design control procedures and bill of materials management guidelines for substitution approval processes.

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