CZRT5232B-HF Zener Diode 5.6V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT5232B-HF is a surface-mount Zener diode manufactured by Comchip Technology, rated at 5.6 V nominal with 350 mW maximum power dissipation in SOT-23-3 package. The device is Active status and ROHS3 compliant. Substitute parts are identified based on matching electrical specifications (Zener voltage, power rating, tolerance, and thermal operating range) and identical mechanical packaging (SOT-23-3 / TO-236-3 / SC-59).

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	12	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 / TO-236-3 / SC-59	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts are grouped by electrical compatibility with the CZRT5232B-HF based on the following criteria:

Primary Substitution Criteria:

Zener voltage: 5.6 V nominal
Package: SOT-23-3 / TO-236-3 / SC-59 (identical mechanical footprint)
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance
Surface-mount technology

Secondary Compatibility Factors:

Power rating: 300 mW to 350 mW (acceptable range for 350 mW rated device)
Tolerance: ±2% to ±7% (tighter tolerances are acceptable; looser tolerances require application review)
Impedance: 11 to 40 Ohms (variation acceptable within Zener diode specifications)
Reverse leakage current: 500 nA to 5 µA (low-leakage variants acceptable)

Parts are classified as direct substitutes when all primary criteria are met. Parts with reduced power rating (300 mW vs. 350 mW) or tighter tolerance (±2% vs. ±5%) are listed as manufacturer-recommended alternatives for applications with specific requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ω)	Ir @ Vr	Temp Range (°C)	Package	Status
CZRT5232B-HF	Comchip Technology	5.6	±5%	350	12	5 µA @ 3V	-65 to 150	SOT-23-3	Active
MMBZ5232B-7-F	Diodes Incorporated	5.6	±5%	350	11	5 µA @ 3V	-65 to 150	SOT-23-3	Active
MMBZ5232BQ-7-F	Diodes Incorporated	5.6	±5%	350	11	5 µA @ 3V	-65 to 150	SOT-23-3	Active (AEC-Q101)
BZX84B5V6-7-F	Diodes Incorporated	5.6	±2%	300	40	1 µA @ 2V	-65 to 150	SOT-23-3	Active
BZX84B5V6-TP	Micro Commercial Co	5.6	±2%	350	40	1 µA @ 2V	-55 to 150	SOT-23-3	Active
BZX84B5V6Q-13-F	Diodes Incorporated	5.6	±2%	300	40	1 µA @ 2V	-65 to 150	SOT-23-3	Active (AEC-Q101)
BZX84B5V6Q-7-F	Diodes Incorporated	5.6	±2%	300	40	1 µA @ 2V	-65 to 150	SOT-23-3	Active (AEC-Q101)
BZX84C5V6-7-F	Diodes Incorporated	5.6	±7%	300	40	1 µA @ 2V	-65 to 150	SOT-23-3	Active
BZX84C5V6-TP	Micro Commercial Co	5.6	±5%	350	40	1 µA @ 2V	-55 to 150	SOT-23-3	Active
DDZX5V6B-13	Diodes Incorporated	5.6	±3%	300	11	500 nA @ 2.5V	-65 to 150	SOT-23-3	Active
DDZX5V6B-7	Diodes Incorporated	5.6	±3%	300	11	500 nA @ 2.5V	-65 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Direct Substitutes (Electrical and Mechanical Equivalence):

MMBZ5232B-7-F and MMBZ5232BQ-7-F are direct substitutes for CZRT5232B-HF. Both maintain identical Zener voltage (5.6 V), tolerance (±5%), power rating (350 mW), and operating temperature range (-65°C to 150°C). MMBZ5232BQ-7-F includes AEC-Q101 automotive qualification, suitable for automotive applications. Both are ROHS3 compliant with MSL 1 rating.

Manufacturer-Recommended Alternatives (Reduced Power Rating):

BZX84B5V6-7-F, BZX84B5V6Q-13-F, BZX84B5V6Q-7-F, DDZX5V6B-13, and DDZX5V6B-7 are rated at 300 mW maximum power (versus 350 mW). These are suitable for applications where the 350 mW rating is not required. BZX84B5V6Q variants include AEC-Q101 automotive qualification. DDZX5V6B variants feature lower reverse leakage current (500 nA) and lower impedance (11 Ohms), matching CZRT5232B-HF impedance characteristics.

Manufacturer-Recommended Alternatives (Tighter Tolerance):

BZX84B5V6-7-F, BZX84B5V6Q-13-F, BZX84B5V6Q-7-F, and DDZX5V6B variants offer ±2% or ±3% tolerance versus ±5% of the main part. These are suitable for precision voltage regulation applications. BZX84C5V6-7-F offers ±7% tolerance with 300 mW rating.

Temperature Range Consideration:

BZX84B5V6-TP and BZX84C5V6-TP (Micro Commercial Co) operate from -55°C to 150°C, which is narrower than the -65°C to 150°C range of CZRT5232B-HF. These are suitable only for applications not requiring -65°C operation.

All substitute parts are ROHS3 compliant and MSL 1 rated.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5232B-7-F replace CZRT5232B-HF directly?

A: Yes. MMBZ5232B-7-F is a direct substitute. Both devices have identical Zener voltage (5.6 V), tolerance (±5%), power rating (350 mW), operating temperature range (-65°C to 150°C), and SOT-23-3 package. Impedance differs slightly (11 Ω vs. 12 Ω), which is within acceptable Zener diode specification variance.

Q: What is the difference between BZX84B5V6-7-F and CZRT5232B-HF?

A: BZX84B5V6-7-F has a reduced power rating (300 mW vs. 350 mW) and tighter tolerance (±2% vs. ±5%). It is suitable for applications not requiring the full 350 mW dissipation capability. Zener voltage, package, and operating temperature range are identical.

Q: Can I use BZX84B5V6-TP in place of CZRT5232B-HF?

A: BZX84B5V6-TP is mechanically and electrically compatible but has a narrower operating temperature range (-55°C to 150°C vs. -65°C to 150°C). Use only if your application does not require operation below -55°C.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive qualification standard. MMBZ5232BQ-7-F, BZX84B5V6Q-13-F, and BZX84B5V6Q-7-F carry this qualification, making them suitable for automotive applications. Non-qualified parts (CZRT5232B-HF, MMBZ5232B-7-F) are suitable for industrial and consumer applications.

Q: Why do some substitutes have lower impedance (11 Ω vs. 40 Ω)?

A: Impedance variation is normal across Zener diode manufacturers and series. Lower impedance (MMBZ5232B-7-F, DDZX5V6B series) indicates better voltage regulation characteristics. Higher impedance (BZX84 series) is acceptable for general-purpose applications. Select based on your circuit's voltage regulation requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching CZRT5232B-HF compliance status.

Q: Can I use DDZX5V6B-7 instead of CZRT5232B-HF?

A: DDZX5V6B-7 is compatible with restrictions. It has identical Zener voltage (5.6 V), package (SOT-23-3), and operating temperature range (-65°C to 150°C), but reduced power rating (300 mW vs. 350 mW) and tighter tolerance (±3% vs. ±5%). Use only if your application does not require 350 mW dissipation.

Q: What is the difference between tape reel (TR) and cut tape (CT) packaging?

A: Both are surface-mount delivery formats. Tape & Reel (TR) is supplied on continuous carrier tape in reel format for automated assembly. Cut Tape (CT) is supplied in shorter tape segments. Electrical specifications are identical; packaging format affects procurement and assembly processes only.

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