CZRF20VB-HF Zener Diode Equivalent & Substitute Parts

Part Overview

The CZRF20VB-HF is a 20 V, 200 mW Zener diode manufactured by Comchip Technology in a 1005/SOD-323F surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 125°C with ±3% voltage tolerance and is RoHS3 compliant.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	20 V
Power - Max	200 mW
Tolerance	±3%
Impedance (Max)	48 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 15 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	1005 (2512 Metric) / SOD-323F
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CZRF20VB-HF is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 20 V nominal
Surface mount technology
RoHS3 compliance
Operating temperature range compatibility

Secondary Compatibility Factors:

Power dissipation rating (200 mW minimum)
Package form factor (SOD-323F or equivalent)
Voltage tolerance (±3% to ±6%)
Impedance characteristics (20-55 Ohms)

The substitute parts listed maintain the 20 V zener voltage specification and surface mount configuration. Variations in power rating, impedance, and tolerance reflect different product lines and manufacturers while preserving core electrical function.

Parameter Comparison

Parameter	CZRF20VB-HF	BZT52C20S-TP	BZX84J-B20,115	BZX84J-C20,115	BZX884-B20,315	TDZ20J,115
Manufacturer	Comchip Technology	Micro Commercial Co	NXP Semiconductors	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom)	20 V	20 V	20 V	20 V	20 V	20 V
Tolerance	±3%	±6%	±2%	±5%	±2%	±2%
Power - Max	200 mW	200 mW	550 mW	550 mW	250 mW	500 mW
Impedance (Max)	48 Ohms	55 Ohms	20 Ohms	20 Ohms	55 Ohms	20 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 15 V	100 nA @ 14 V	50 nA @ 14 V	50 nA @ 14 V	50 nA @ 14 V	50 nA @ 14 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	900 mV @ 10 mA	1.1 V @ 100 mA
Operating Temperature	-55°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	1005 / SOD-323F	SC-76 / SOD-323	SC-90 / SOD-323F	SC-90 / SOD-323F	SOD-882 / DFN1006-2	SC-90 / SOD-323F
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Not specified	Not specified	Yes (AEC-Q101)	Yes (AEC-Q101)	Yes (AEC-Q100)	Yes (AEC-Q101)

Engineering Selection Recommendations

BZT52C20S-TP (Micro Commercial Co) provides the closest electrical match to the CZRF20VB-HF with identical 200 mW power rating and 900 mV forward voltage specification. This part is active in production with extended temperature range (-65°C to 150°C) and RoHS3 compliance. Package compatibility requires verification as SOD-323 differs from the original SOD-323F.

BZX84J-B20,115 and BZX84J-C20,115 (Nexperia) offer higher power dissipation (550 mW) with improved impedance characteristics (20 Ohms) and tighter voltage tolerance (±2% and ±5% respectively). Both carry automotive qualification (AEC-Q101) and active product status. These parts are suitable for applications requiring enhanced thermal performance.

BZX884-B20,315 (Nexperia) provides a compact alternative in DFN1006-2 package with 250 mW power rating and automotive qualification (AEC-Q100). This option bridges the power gap between the original 200 mW specification and higher-rated alternatives.

TDZ20J,115 (Nexperia) delivers 500 mW power dissipation with automotive qualification (AEC-Q101) and ±2% tolerance. Operating temperature extends to 150°C maximum, exceeding the original specification. This part suits applications requiring higher power handling within the TDZxJ series.

All substitute parts maintain RoHS3 compliance and the critical 20 V zener voltage specification. Selection depends on specific application requirements for power dissipation, package footprint, temperature range, and automotive qualification needs.

Frequently Asked Questions (FAQ)

Q: Can BZT52C20S-TP directly replace CZRF20VB-HF in existing PCB layouts?

A: Both parts are surface mount with 20 V zener voltage and 200 mW power rating. However, package verification is required. CZRF20VB-HF uses SOD-323F while BZT52C20S-TP uses SOD-323. Physical dimensions and pin configurations must be confirmed for PCB compatibility.

Q: What is the difference between the NXP BZX84J series and Nexperia alternatives?

A: BZX84J-B20,115 and BZX84J-C20,115 are manufactured by NXP Semiconductors and Nexperia USA Inc. respectively. Both offer 550 mW power dissipation and automotive qualification (AEC-Q101). The primary difference is voltage tolerance: ±2% for BZX84J-B20,115 and ±5% for BZX84J-C20,115.

Q: Why do substitute parts have higher power ratings than the original CZRF20VB-HF?

A: Higher power ratings (250 mW to 550 mW) in substitute parts reflect modern manufacturing capabilities and design improvements. These parts are backward compatible for 200 mW applications and provide design margin for thermal stress and component aging.

Q: Is automotive qualification required for my application?

A: Automotive qualification (AEC-Q101 or AEC-Q100) is specified for BZX84J-B20,115, BZX84J-C20,115, BZX884-B20,315, and TDZ20J,115. Non-automotive applications can use BZT52C20S-TP. Verify your application requirements before selection.

Q: What is the temperature range consideration for substitute selection?

A: CZRF20VB-HF operates -55°C to 125°C. Most substitutes extend to -65°C to 150°C, providing wider operating margin. TDZ20J,115 maintains the -55°C lower limit. Confirm your application temperature requirements for appropriate part selection.

Q: How do impedance differences affect circuit performance?

A: Impedance values range from 20 Ohms (NXP/Nexperia parts) to 55 Ohms (Micro Commercial and BZX884-B20,315). Lower impedance provides better voltage regulation under load changes. Verify impedance specifications against your circuit design requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the original CZRF20VB-HF specification.

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