CZRW55C11-G Zener Diode Equivalent & Substitute Parts

Part Overview

The CZRW55C11-G is a surface mount Zener diode manufactured by Comchip Technology, rated at 11 V nominal Zener voltage with 500 mW power dissipation in SOD-123 packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement continuity. Substitute parts maintain the core electrical specifications while offering improved availability and active product status from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	-
Power - Max	500	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
Package / Case	SOD-123	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the CZRW55C11-G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 11 V (exact match required)
Power - Max: 500 mW (minimum requirement)
Package / Case: SOD-123 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Tolerance: ±5% (acceptable performance window)

Secondary Compatibility Factors:

Operating Temperature Range: -65°C to 150°C minimum
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (functional equivalence)
Current - Reverse Leakage @ Vr: 100 nA @ 8 V (baseline specification)
RoHS3 Compliance: Required for regulatory alignment

Parts meeting all primary criteria are classified as direct substitutes. Parts with minor deviations in secondary parameters (impedance, reverse leakage) remain functionally equivalent within the specified tolerance band.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Status	Inventory
CZRW55C11-G	Comchip Technology	11 V	±5%	500 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150°C	Obsolete	621 Pcs
BZT52C11-HF	Comchip Technology	11 V	±5%	500 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55 to 150°C	Active	1110 Pcs
DDZ9698-7	Diodes Incorporated	11 V	±5%	500 mW	-	50 nA @ 8.4 V	900 mV @ 10 mA	-65 to 150°C	Active	6000 Pcs
MMSZ5241B-7-F	Diodes Incorporated	11 V	±5%	500 mW	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-65 to 150°C	Active	32200 Pcs
BZT52B11-E3-18	Vishay General Semiconductor	11 V	±2%	410 mW	15 Ω	100 nA @ 8.5 V	-	-65 to 150°C	Active	11576 Pcs
BZT52C11-7-F	Diodes Incorporated	11 V	±5%	500 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150°C	Active	65200 Pcs

Engineering Selection Recommendations

Primary Recommendation: BZT52C11-7-F

BZT52C11-7-F from Diodes Incorporated provides complete parametric equivalence to CZRW55C11-G across all primary substitution criteria. This part maintains identical Zener voltage (11 V), power rating (500 mW), impedance (20 Ω), reverse leakage (100 nA @ 8 V), and forward voltage specifications. Operating temperature range extends to -65°C minimum, matching the original specification. Active product status ensures long-term availability. Highest inventory level (65200 Pcs) supports immediate procurement. Cut Tape and Digi-Reel packaging options provide flexibility for both prototype and production volumes. ROHS3 compliance and REACH unaffected status maintain regulatory alignment.

Secondary Recommendation: DDZ9698-7

DDZ9698-7 from Diodes Incorporated meets all primary electrical specifications with 11 V Zener voltage and 500 mW power rating in SOD-123 packaging. Reverse leakage specification (50 nA @ 8.4 V) is superior to the original part, indicating lower standby current consumption. Operating temperature range (-65°C to 150°C) matches the original specification. Active product status with substantial inventory (6000 Pcs) ensures availability. Suitable for applications where lower reverse leakage is beneficial.

Alternative Recommendation: MMSZ5241B-7-F

MMSZ5241B-7-F from Diodes Incorporated maintains core electrical specifications (11 V, 500 mW, SOD-123) with highest available inventory (32200 Pcs). Impedance specification (22 Ω) represents a minor deviation within acceptable tolerance. Reverse leakage specification (2 µA @ 8.4 V) is higher than the original part. Suitable for applications where reverse leakage is not a critical parameter. Active product status supports long-term design continuity.

Conditional Recommendation: BZT52B11-E3-18

BZT52B11-E3-18 from Vishay General Semiconductor provides improved tolerance specification (±2% versus ±5%) and lower impedance (15 Ω). Power rating (410 mW) is reduced compared to the original 500 mW specification. This part is suitable only for applications where the 410 mW power rating is sufficient and improved voltage tolerance is required. Active product status and substantial inventory (11576 Pcs) support procurement. Not recommended as a direct drop-in replacement for designs requiring full 500 mW power dissipation capability.

Not Recommended: BZT52C11-HF

BZT52C11-HF from Comchip Technology provides parametric equivalence but with reduced operating temperature minimum (-55°C versus -65°C). Suitable only for applications with operating temperature floor above -55°C. Lower inventory (1110 Pcs) compared to alternative sources. Tape & Reel packaging limits prototype flexibility.

Frequently Asked Questions (FAQ)

Q: Can BZT52C11-7-F directly replace CZRW55C11-G without circuit modification?

A: Yes. BZT52C11-7-F maintains identical electrical specifications across all primary parameters: 11 V Zener voltage, 500 mW power rating, 20 Ω impedance, 100 nA reverse leakage, and 900 mV forward voltage. SOD-123 package and surface mount configuration ensure mechanical compatibility. No circuit modification is required.

Q: What is the difference between the substitute parts in terms of reverse leakage current?

A: Reverse leakage specifications vary across substitutes. CZRW55C11-G specifies 100 nA @ 8 V. DDZ9698-7 specifies 50 nA @ 8.4 V (lower leakage). MMSZ5241B-7-F specifies 2 µA @ 8.4 V (higher leakage). Lower reverse leakage reduces standby power consumption; higher leakage may impact low-power applications. Select based on application requirements.

Q: Why does BZT52B11-E3-18 have lower power rating than the original part?

A: BZT52B11-E3-18 is rated at 410 mW maximum power dissipation compared to CZRW55C11-G at 500 mW. This represents a design variant with different thermal characteristics. Use this part only if circuit design confirms power dissipation remains below 410 mW under all operating conditions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, ensuring regulatory alignment with current environmental standards.

Q: What packaging options are available for substitute parts?

A: BZT52C11-7-F is available in Cut Tape (CT) and Digi-Reel packaging, supporting both prototype and production volumes. DDZ9698-7 and MMSZ5241B-7-F are supplied in Tape & Reel (TR) format for production quantities. BZT52B11-E3-18 is supplied in Tape & Reel format. BZT52C11-HF is supplied in Tape & Reel format.

Q: Which substitute part has the highest inventory availability?

A: BZT52C11-7-F maintains the highest inventory level at 65200 Pcs, followed by MMSZ5241B-7-F at 32200 Pcs. Both support immediate procurement for production requirements.

Q: Can MMSZ5241B-7-F be used in applications sensitive to reverse leakage current?

A: MMSZ5241B-7-F specifies 2 µA reverse leakage @ 8.4 V, which is significantly higher than the original part (100 nA @ 8 V). This part is not suitable for low-power or standby-sensitive applications. Use DDZ9698-7 or BZT52C11-7-F for applications where reverse leakage is a critical parameter.

Q: What is the operating temperature difference between BZT52C11-HF and other substitutes?

A: BZT52C11-HF specifies -55°C to 150°C operating range, while CZRW55C11-G and most substitutes specify -65°C to 150°C. BZT52C11-HF is not suitable for applications requiring operation below -55°C. Use BZT52C11-7-F, DDZ9698-7, MMSZ5241B-7-F, or BZT52B11-E3-18 for full -65°C minimum temperature support.

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