CZRW55C13-G Zener Diode 13V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The CZRW55C13-G is a surface mount Zener diode manufactured by Comchip Technology, rated at 13 V nominal Zener voltage with 500 mW maximum power dissipation in SOD-123 package. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications. Substitute parts must satisfy the core electrical specifications: 13 V Zener voltage, SOD-123 surface mount package, and compatible power ratings and tolerance ranges.

Key Parameters

Parameter	CZRW55C13-G	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±6%	%
Power - Max	500	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature	-65°C ~ 150°C	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 13 V nominal (matching CZRW55C13-G)
Package type: SOD-123 surface mount (mechanical compatibility)
Power rating: 500 mW or greater (equal or superior power handling)
Impedance (Max): 30 Ohms or lower (electrical performance)
Reverse leakage current: 100 nA @ specified voltage (leakage characteristics)
Forward voltage: 900 mV @ 10 mA (forward conduction behavior)
Operating temperature range: Must encompass or match -65°C ~ 150°C
RoHS3 compliance and MSL 1 rating (regulatory and environmental requirements)

Substitution Grouping Logic:

Parts are classified into two categories based on power rating alignment:

Group A - Full Power Rating Match (500 mW): Parts maintaining the original 500 mW specification provide direct functional equivalence with no derating required.

Group B - Reduced Power Rating (200-410 mW): Parts with lower power ratings are suitable only for applications where the circuit design does not require the full 500 mW dissipation capacity. These require circuit-level verification.

All substitute parts listed maintain 13 V Zener voltage, SOD-123 package, and active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	CZRW55C13-G (Obsolete)	BZT52C13-HF (Comchip)	BZT52C13-7-F (Diodes Inc)	BZT52C13-TP (MCC)	BZT52B13-E3-08 (Vishay)
Manufacturer	Comchip Technology	Comchip Technology	Diodes Incorporated	Micro Commercial Co	Vishay General Semiconductor
Voltage - Zener (Nom)	13 V	13 V	13 V	13 V	13 V
Tolerance	±6%	±5%	±6.42%	±6%	±2%
Power - Max	500 mW	500 mW	500 mW	200 mW	410 mW
Impedance (Max)	30 Ohms	30 Ohms	30 Ohms	30 Ohms	25 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 10 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	Not specified
Operating Temperature	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation - Full Electrical Equivalence:

BZT52C13-HF (Comchip Technology) is the preferred substitute. This part maintains identical electrical specifications to the CZRW55C13-G with the exception of improved tolerance (±5% versus ±6%) and a narrower operating temperature minimum (-55°C versus -65°C). The part is active in production, ROHS3 compliant, and available in Tape & Reel packaging. The tighter tolerance provides superior voltage regulation characteristics. The reduced lower temperature limit (-55°C) is acceptable for most industrial and commercial applications; verification is required only for equipment specified for operation below -55°C.

Secondary Recommendation - Full Power Rating Match:

BZT52C13-7-F (Diodes Incorporated) provides complete electrical and mechanical compatibility with the original part. This part maintains 500 mW power rating, 30 Ohms maximum impedance, and the full -65°C ~ 150°C operating temperature range. The tolerance specification (±6.42%) is marginally wider than the original (±6%), but remains within acceptable engineering margins. This part is active in production with high inventory availability (155,200 pcs) and is supplied in Cut Tape and Digi-Reel packaging formats.

Tertiary Recommendation - Reduced Power Rating:

BZT52C13-TP (Micro Commercial Co) is suitable for applications where circuit design analysis confirms that power dissipation does not exceed 200 mW. This part maintains all other electrical parameters and the full operating temperature range. Selection of this part requires circuit-level power budget verification to ensure the reduced 200 mW rating is adequate.

Alternative - Superior Tolerance Performance:

BZT52B13-E3-08 (Vishay General Semiconductor) offers the tightest tolerance specification (±2%) among all substitutes, providing superior voltage regulation accuracy. Power rating is 410 mW, which is adequate for most applications but requires verification for designs requiring the full 500 mW capacity. Operating temperature range matches the original specification. This part is active in production and ROHS3 compliant.

Compliance and Availability:

All recommended substitutes are ROHS3 compliant, MSL 1 rated, and currently in active production status, ensuring long-term supply chain continuity and regulatory compliance for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q1: Can BZT52C13-TP (200 mW) be used as a direct replacement for CZRW55C13-G (500 mW)?

A: BZT52C13-TP is electrically compatible but has reduced power dissipation capacity. Direct substitution is permissible only if circuit analysis confirms that the Zener diode operates at or below 200 mW under all operating conditions, including worst-case scenarios. If the original design requires 500 mW dissipation capability, this part is not suitable without circuit modification.

Q2: What is the significance of the tolerance difference between CZRW55C13-G (±6%) and BZT52C13-HF (±5%)?

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 13 V value. The ±6% tolerance on CZRW55C13-G permits voltage variation between 12.22 V and 13.78 V. The ±5% tolerance on BZT52C13-HF permits variation between 12.35 V and 13.65 V. The tighter tolerance of BZT52C13-HF provides more precise voltage regulation, which is beneficial for sensitive analog circuits. Both tolerances are acceptable for standard voltage regulation applications.

Q3: Why does BZT52C13-HF have a narrower operating temperature range (-55°C ~ 150°C) compared to CZRW55C13-G (-65°C ~ 150°C)?

A: The lower temperature limit difference reflects different design specifications between manufacturers. BZT52C13-HF is rated to -55°C minimum, while CZRW55C13-G is rated to -65°C. For applications operating above -55°C, this difference is not relevant. For equipment specified for operation below -55°C, BZT52C13-7-F or BZT52B13-E3-08 are required to maintain the full -65°C lower limit.

Q4: Are all substitute parts available in the same packaging format as CZRW55C13-G?

A: All substitute parts use the SOD-123 surface mount package, ensuring mechanical and footprint compatibility. However, packaging formats (Tape & Reel, Cut Tape, Digi-Reel) differ by supplier. Verify that the selected packaging format is compatible with your assembly process and equipment.

Q5: What does ROHS3 compliance mean for these Zener diodes?

A: ROHS3 compliance indicates that the part meets the Restriction of Hazardous Substances Directive, restricting the use of lead, cadmium, mercury, hexavalent chromium, and certain brominated flame retardants. All listed substitute parts are ROHS3 compliant, ensuring regulatory compliance for products sold in the European Union and other regions with equivalent environmental regulations.

Q6: Can BZT52B13-E3-08 with ±2% tolerance replace CZRW55C13-G with ±6% tolerance in all applications?

A: Yes, BZT52B13-E3-08 is a superior substitute from a tolerance perspective. The tighter ±2% tolerance is backward compatible with designs that accept ±6% tolerance. However, the 410 mW power rating is lower than the original 500 mW specification. Substitution is valid only if circuit power dissipation analysis confirms operation at or below 410 mW.

Q7: What is the Moisture Sensitivity Level (MSL) 1 rating, and why is it important?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture control during storage or handling. This is the most favorable MSL rating and simplifies inventory management and supply chain logistics. All listed substitute parts carry MSL 1 rating.

Q8: How do I determine which substitute part is best for my application?

A: Selection depends on three factors: (1) Required power dissipation capacity—if 500 mW is required, select BZT52C13-HF or BZT52C13-7-F; if 410 mW is adequate, BZT52B13-E3-08 is acceptable; if 200 mW is sufficient, BZT52C13-TP is viable. (2) Operating temperature range—if operation below -55°C is required, select BZT52C13-7-F or BZT52B13-E3-08. (3) Voltage regulation precision—if tighter tolerance is beneficial, BZT52B13-E3-08 (±2%) is preferred over alternatives.

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