BZT52C33-TP Equivalent & Substitute Parts

Part Overview

The BZT52C33-TP is a Zener diode manufactured by Micro Commercial Co, rated at 33 V nominal with 200 mW maximum power dissipation in a surface mount SOD-123 package. This component is classified as Active and is ROHS3 compliant. The part is used in voltage regulation and protection circuits where precise 33 V reference voltage is required.

Substitute parts are necessary when the primary part becomes unavailable, when higher power ratings are required for the same application, or when alternative package configurations are needed to meet specific design constraints.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±6%	-
Power - Max	200	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 23.1 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	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the BZT52C33-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): Must be 33 V or within ±6% tolerance range
Package / Case: SOD-123 or SOD-323 (same footprint family)
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass -65°C to 150°C or be compatible with application requirements
RoHS Status: ROHS3 Compliant preferred for regulatory alignment

Secondary Substitution Criteria:

Power - Max: Can be equal to or greater than 200 mW
Impedance (Max): 80 Ohms or lower
Tolerance: ±6% or tighter
Current - Reverse Leakage: 100 nA or lower at specified voltage

Substitute parts are grouped into three categories:

Direct Substitutes (Higher Power Rating): Parts with identical electrical specifications except for increased power dissipation (500 mW). These are pin-compatible and functionally equivalent with enhanced thermal capability.

Similar Substitutes (Alternative Package): Parts with matching voltage and tolerance specifications but different package configurations (SOD-323 instead of SOD-123). These require PCB layout modification but maintain electrical equivalence.

Similar Substitutes (Automotive Grade): Parts meeting automotive qualification standards (AEC-Q101) with comparable electrical specifications. These include tighter tolerances and lower leakage currents.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Status	RoHS
BZT52C33-TP	Micro Commercial Co	33 V	±6%	200 mW	80 Ω	SOD-123	Active	ROHS3
BZT52C33-13-F	Diodes Incorporated	33 V	±6%	500 mW	80 Ω	SOD-123	Active	ROHS3
BZT52C33-7-F	Diodes Incorporated	33 V	±6%	500 mW	80 Ω	SOD-123	Active	ROHS3
BZT52-C33_R1_00001	Panjit International Inc.	33 V	±5%	410 mW	80 Ω	SOD-123	Active	ROHS3
BZT52C33-13	Diodes Incorporated	33 V	±6%	500 mW	80 Ω	SOD-123	Discontinued	Non-compliant
BZT52C33Q-7-F	Diodes Incorporated	33 V	±6.06%	370 mW	80 Ω	SOD-123	Active	ROHS3
BZT52C33S-7-F	Diodes Incorporated	33 V	±6%	200 mW	80 Ω	SOD-323	Active	ROHS3
CMHZ5257B TR PBFREE	Central Semiconductor Corp	33 V	±5%	500 mW	58 Ω	SOD-123	Active	ROHS3
DDZ33Q-7	Diodes Incorporated	32.97 V	±3%	310 mW	75 Ω	SOD-123	Active	ROHS3
DDZ33S-7	Diodes Incorporated	33 V	±2.5%	200 mW	75 Ω	SOD-323	Active	ROHS3
DDZ9714-7	Diodes Incorporated	33 V	±5%	500 mW	-	SOD-123	Active	ROHS3

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (SOD-123 Package):

BZT52C33-7-F and BZT52C33-13-F from Diodes Incorporated are direct substitutes with identical electrical specifications and higher power rating (500 mW vs. 200 mW). Both are Active status, ROHS3 compliant, and maintain the same SOD-123 footprint. BZT52C33-7-F has higher inventory availability (21,200 pcs) compared to BZT52C33-13-F (4,463 pcs).

For Equivalent Performance with Tighter Tolerance:

DDZ9714-7 from Diodes Incorporated provides 33 V nominal with 500 mW power rating and ±5% tolerance. This part has the highest inventory availability (52,545 pcs) and is ROHS3 compliant. It is suitable for applications requiring higher power dissipation capacity.

For Automotive-Grade Applications:

BZT52C33Q-7-F from Diodes Incorporated is AEC-Q101 qualified and rated for automotive use. It provides 33 V nominal with 370 mW power rating and maintains ROHS3 compliance. This part is recommended for automotive or mission-critical applications requiring qualification documentation.

For Alternative Package Configuration (SOD-323):

BZT52C33S-7-F from Diodes Incorporated matches the original 200 mW power rating with identical electrical specifications but uses the smaller SOD-323 package. This requires PCB layout modification but provides space savings. DDZ33S-7 offers the same package with tighter ±2.5% tolerance and lower impedance (75 Ω).

Parts to Avoid:

BZT52C33-13 from Diodes Incorporated is discontinued at DiGi Electronics and is RoHS non-compliant, making it unsuitable for new designs.

Frequently Asked Questions (FAQ)

Q: Can BZT52C33-7-F be used as a direct replacement for BZT52C33-TP?

A: Yes. BZT52C33-7-F is a direct pin-compatible substitute with identical nominal voltage (33 V), tolerance (±6%), impedance (80 Ω), and operating temperature range (-65°C to 150°C). The higher power rating (500 mW vs. 200 mW) provides additional thermal margin without affecting circuit operation. Both use SOD-123 packaging and are ROHS3 compliant.

Q: What is the difference between SOD-123 and SOD-323 packages?

A: SOD-123 and SOD-323 are both surface mount packages for two-terminal diodes but differ in physical dimensions. SOD-323 is smaller than SOD-123. Parts using SOD-323 (such as BZT52C33S-7-F and DDZ33S-7) require different PCB footprints and cannot be used as direct pin-compatible replacements without layout modification.

Q: Why would I choose a higher power-rated substitute like BZT52C33-7-F over the original BZT52C33-TP?

A: Higher power-rated substitutes (500 mW vs. 200 mW) provide improved thermal performance and allow operation at higher current levels without exceeding maximum junction temperature. This is beneficial in applications with variable load conditions or where thermal margin is critical. The electrical characteristics remain identical.

Q: Are automotive-qualified parts like BZT52C33Q-7-F suitable for non-automotive applications?

A: Yes. Automotive-qualified parts (AEC-Q101) meet or exceed commercial-grade specifications and can be used in any application. They typically feature tighter tolerances, lower leakage currents, and more rigorous testing. Their use in non-automotive applications provides enhanced reliability without penalty.

Q: What does ±6% tolerance mean for the 33 V zener voltage?

A: ±6% tolerance on a 33 V nominal zener means the actual zener voltage will fall within the range of 31.02 V to 34.98 V. This specification defines the acceptable variation in the reference voltage across the manufacturing process and operating conditions. Tighter tolerances (such as ±3% or ±2.5%) provide narrower voltage ranges for applications requiring more precise regulation.

Q: Can I use DDZ33Q-7 with 32.97 V nominal voltage instead of 33 V?

A: DDZ33Q-7 has a nominal voltage of 32.97 V with ±3% tolerance, resulting in an operating range of 31.98 V to 33.96 V. This overlaps with the BZT52C33-TP range (31.02 V to 34.98 V) but is not an exact match. Use DDZ33Q-7 only if the application can tolerate the slightly lower nominal voltage or if the tighter tolerance provides a specific advantage.

Q: What is impedance (Zzt) and why does it matter?

A: Impedance (Zzt) is the dynamic resistance of the zener diode in the breakdown region. Lower impedance values indicate better voltage regulation and lower output impedance. The BZT52C33-TP specifies 80 Ω maximum impedance. Substitutes with equal or lower impedance (such as CMHZ5257B with 58 Ω) provide equivalent or superior regulation performance.

Q: Is CMHZ5257B TR PBFREE a suitable substitute despite different impedance?

A: Yes. CMHZ5257B TR PBFREE provides 33 V nominal with ±5% tolerance, 500 mW power rating, and lower impedance (58 Ω vs. 80 Ω). The lower impedance represents an improvement in voltage regulation characteristics. This part is ROHS3 compliant and Active status, making it a suitable substitute with enhanced performance.

Q: What does RoHS compliance mean for component selection?

A: ROHS3 compliance indicates the component does not contain restricted substances (lead, cadmium, mercury, etc.) as defined by the Restriction of Hazardous Substances Directive. For new designs and applications subject to regulatory requirements, ROHS3 compliant parts are mandatory. All recommended substitutes are ROHS3 compliant except BZT52C33-13, which should not be used in new designs.

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