BZX84C11-7 Equivalent & Substitute Parts

Part Overview

The BZX84C11-7 is a Zener diode rated at 11 V nominal with 300 mW maximum power dissipation in a surface mount SOT-23-3 package. Manufactured by Diodes Incorporated, this component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part operates across a temperature range of -65°C to 150°C with ±5% voltage tolerance and is classified as RoHS non-compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	—
Power - Max	300	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 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BZX84C11-7 is determined by the following critical parameters:

Zener Voltage (Vz): Must be 11 V nominal
Voltage Tolerance: ±5% or tighter
Package / Case: TO-236-3, SC-59, or SOT-23-3 (surface mount compatibility)
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass -65°C to 150°C or equivalent
Power Dissipation: Minimum 300 mW or higher (parts with lower ratings require application review)
Impedance (Zzt): 20 Ohms or 22 Ohms (minor variation acceptable)
Reverse Leakage Current: 100 nA @ 8 V or 2 µA @ 8.4 V (minor variation acceptable)

Substitute parts are grouped into two categories:

Category A - Direct Parametric Equivalents: Parts matching all critical electrical parameters and power rating of 300 mW or higher.

Category B - Functional Equivalents: Parts with 11 V nominal zener voltage and SOT-23-3 packaging but with reduced power ratings (225–250 mW) or modified electrical characteristics. These parts are suitable for applications where the full 300 mW dissipation is not required.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Reverse Leakage @ Vr	Vf Max @ If	Temp Range (°C)	Package	Product Status	RoHS
BZX84C11-7	Diodes Incorporated	11	±5%	300	20	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Discontinued	Non-compliant
BZX84C11-7-F	Diodes Incorporated	11	±5%	300	20	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant
BZX84-C11,215	Nexperia USA Inc.	11	±5%	250	20	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant
BZX84-C11,235	NXP USA Inc.	11	±5%	250	20	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant
BZX84B11-TP	Micro Commercial Co	11	±2%	350	20	100 nA @ 8 V	900 mV @ 10 mA	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
BZX84C11-TP	Micro Commercial Co	11	±5%	350	20	100 nA @ 8 V	900 mV @ 10 mA	-55 to 150	SOT-23-3	Active	ROHS3 Compliant
BZX84C11LT1G	onsemi	11	±5%	225	20	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant
MMBZ5241BLT1G	onsemi	11	±5%	225	22	2 µA @ 8.4 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant
SZBZX84C11LT1G	onsemi	11	±5%	225	20	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant
SZMMBZ5241BLT1G	onsemi	11	±5%	225	22	2 µA @ 8.4 V	900 mV @ 10 mA	-65 to 150	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BZX84C11-7-F

The BZX84C11-7-F from Diodes Incorporated is the direct parametric equivalent to the BZX84C11-7. It maintains identical electrical specifications (11 V, ±5%, 300 mW, 20 Ohms impedance) and operating temperature range (-65°C to 150°C). The part is currently active with ROHS3 compliance and is available in high volume (35,100 pcs in stock). This part requires no application redesign and provides the most direct replacement path.

Secondary Recommendations for Active Designs: BZX84C11-TP and BZX84B11-TP

The BZX84C11-TP and BZX84B11-TP from Micro Commercial Co offer enhanced power dissipation (350 mW), exceeding the original 300 mW specification. Both parts maintain 11 V nominal zener voltage, SOT-23-3 packaging, and ROHS3 compliance. The BZX84B11-TP provides tighter tolerance (±2%) compared to the original ±5%. Operating temperature range is -55°C to 150°C, which covers the original -65°C lower limit with a 10°C reduction. These parts are suitable for applications where additional thermal margin is beneficial.

Functional Equivalents for Power-Constrained Applications: BZX84C11LT1G, SZBZX84C11LT1G, MMBZ5241BLT1G, SZMMBZ5241BLT1G

These parts from onsemi maintain 11 V nominal zener voltage and SOT-23-3 packaging with reduced power ratings (225 mW). All are ROHS3 compliant and active. The SZBZX84C11LT1G and SZMMBZ5241BLT1G carry AEC-Q101 automotive qualification. These parts are applicable to designs where power dissipation does not exceed 225 mW and where the lower impedance or leakage characteristics are acceptable.

Nexperia Alternatives: BZX84-C11,215 and BZX84-C11,235

Both Nexperia parts (BZX84-C11,215 and BZX84-C11,235) provide 11 V nominal zener voltage with 250 mW power rating and ROHS3 compliance. The BZX84-C11,215 carries AEC-Q101 automotive qualification. These parts bridge the gap between the original 300 mW specification and the lower 225 mW onsemi offerings, suitable for applications requiring moderate power dissipation.

Frequently Asked Questions (FAQ)

Q: Can BZX84C11-7-F be used as a direct replacement for BZX84C11-7?

A: Yes. The BZX84C11-7-F is a parametric equivalent with identical electrical specifications (11 V, ±5%, 300 mW, 20 Ohms impedance) and operating temperature range (-65°C to 150°C). The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between the 300 mW original part and the 225 mW onsemi alternatives?

A: Power dissipation rating indicates the maximum continuous power the diode can safely dissipate. The 225 mW onsemi parts (BZX84C11LT1G, MMBZ5241BLT1G, SZBZX84C11LT1G, SZMMBZ5241BLT1G) are suitable for applications where the actual power dissipation does not exceed 225 mW. If your application requires the full 300 mW capability, use BZX84C11-7-F, BZX84C11-TP, or BZX84B11-TP instead.

Q: Are all substitute parts compatible with the original SOT-23-3 footprint?

A: Yes. All substitute parts listed use the SOT-23-3 (TO-236-3, SC-59) package and are pin-compatible with the original BZX84C11-7. No PCB layout modifications are necessary.

Q: What is the significance of the ±2% tolerance in BZX84B11-TP compared to ±5%?

A: The ±2% tolerance in BZX84B11-TP provides tighter zener voltage control compared to the original ±5% specification. This means the actual zener voltage will be closer to the nominal 11 V value. For applications requiring precise voltage regulation, the tighter tolerance is beneficial. For general-purpose applications, both tolerances are functionally equivalent.

Q: Do the automotive-qualified parts (SZBZX84C11LT1G, SZMMBZ5241BLT1G, BZX84-C11,215) require different handling or storage?

A: Automotive-qualified parts carry AEC-Q101 certification, indicating compliance with automotive reliability standards. From a handling and storage perspective, all parts listed have Moisture Sensitivity Level (MSL) 1 (Unlimited), meaning no special moisture control is required. Handling and storage procedures remain consistent across all substitute options.

Q: What is the difference between MMBZ5241BLT1G and SZMMBZ5241BLT1G?

A: Both parts have identical electrical specifications (11 V, ±5%, 225 mW, 22 Ohms impedance). The SZMMBZ5241BLT1G carries AEC-Q101 automotive qualification, while MMBZ5241BLT1G does not. If automotive qualification is required, use SZMMBZ5241BLT1G. Otherwise, both parts are functionally equivalent.

Q: Can I use BZX84C11-TP or BZX84B11-TP if my application only requires 225 mW dissipation?

A: Yes. The 350 mW power rating of BZX84C11-TP and BZX84B11-TP exceeds the 225 mW requirement, providing additional thermal margin. These parts are suitable for any application requiring 11 V zener voltage in SOT-23-3 packaging with power dissipation up to 350 mW. The higher rating does not negatively impact performance in lower-power applications.

Q: What is the operating temperature difference between -65°C to 150°C and -55°C to 150°C?

A: The original BZX84C11-7 and most substitute parts operate from -65°C to 150°C. The Micro Commercial Co parts (BZX84C11-TP, BZX84B11-TP) operate from -55°C to 150°C, a 10°C reduction at the lower temperature limit. If your application requires operation below -55°C, use parts with the -65°C lower limit. For applications operating above -55°C, both temperature ranges are acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original BZX84C11-7 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the substitute parts satisfy this requirement.

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