BZT52B33-TP Equivalent & Substitute Parts

Part Overview

The BZT52B33-TP is a 33 V Zener diode manufactured by Micro Commercial Co, rated for 410 mW maximum power dissipation in a surface mount SOD-123 package. This component is classified as Active and is ROHS3 compliant. Substitute parts are necessary when the primary part experiences extended lead times, inventory constraints, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Tolerance	±2%	—
Power - Maximum	410	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 25 V	—
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-55°C to 175°C	—
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZT52B33-TP is determined by the following critical parameters:

Mandatory Matching Criteria:

Zener voltage: 33 V nominal
Package type: SOD-123 surface mount
Mounting type: Surface mount
RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

Tolerance: ±2% to ±6% acceptable
Power rating: 310 mW to 500 mW acceptable (equal to or greater than 410 mW preferred)
Impedance: 58 Ohms to 80 Ohms acceptable
Reverse leakage current: 50 nA to 100 nA acceptable
Forward voltage: 900 mV @ 10 mA (consistent across all parts)
Operating temperature: -65°C to 175°C acceptable (minimum -55°C required)

All substitute parts listed maintain the same zener voltage, package configuration, and surface mount technology. Variations in power dissipation, impedance, and tolerance are within acceptable engineering ranges for this component category.

Parameter Comparison

Parameter	BZT52B33-TP (Main)	BZT52C33-7-F	DDZ33-7	MMSZ5257B-HE3-18	SZMMSZ5257BT1G
Manufacturer	Micro Commercial Co	Diodes Incorporated	Diodes Incorporated	Vishay General Semiconductor	onsemi
Voltage - Zener (Nom)	33 V	33 V	33 V	33 V	33 V
Tolerance	±2%	±6%	±2.5%	±5%	±5%
Power - Max	410 mW	500 mW	310 mW	500 mW	500 mW
Impedance (Max)	80 Ohms	80 Ohms	75 Ohms	58 Ohms	58 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 25 V	100 nA @ 23.1 V	50 nA @ 27 V	100 nA @ 25 V	100 nA @ 25 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	—	900 mV @ 10 mA
Operating Temperature	-55°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Primary Substitutes (Active Status):

BZT52C33-7-F and SZMMSZ5257BT1G are the preferred substitutes. Both maintain Active product status, ensuring long-term availability and supply chain stability. BZT52C33-7-F offers higher power dissipation (500 mW) with matching impedance (80 Ohms). SZMMSZ5257BT1G provides automotive-grade qualification (AEC-Q101) with lower impedance (58 Ohms) and higher power rating (500 mW), suitable for applications requiring automotive reliability standards.

DDZ33-7 is an Active substitute with lower power rating (310 mW) and reduced impedance (75 Ohms). This part is suitable for applications where the 410 mW rating of the main part exceeds circuit requirements.

Secondary Substitute (Obsolete Status):

MMSZ5257B-HE3-18 carries Obsolete product status and should be avoided for new designs. While it meets electrical specifications and holds AEC-Q101 automotive qualification, its obsolete classification indicates discontinued manufacturing and limited future availability.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory posture of the main part. Automotive-qualified alternatives (MMSZ5257B-HE3-18 and SZMMSZ5257BT1G) are available for applications requiring AEC-Q101 certification.

Frequently Asked Questions (FAQ)

Q: Can BZT52B33-TP be replaced with DDZ33-7?

A: Yes. DDZ33-7 maintains the same 33 V zener voltage, SOD-123 package, and surface mount configuration. The lower power rating (310 mW versus 410 mW) is acceptable if circuit power dissipation does not exceed 310 mW. Tolerance (±2.5%) and impedance (75 Ohms) remain within acceptable ranges.

Q: What is the difference between BZT52C33-7-F and SZMMSZ5257BT1G?

A: Both parts share 33 V zener voltage, 500 mW power rating, SOD-123 package, and surface mount technology. BZT52C33-7-F has higher impedance (80 Ohms) and wider tolerance (±6%). SZMMSZ5257BT1G has lower impedance (58 Ohms), tighter tolerance (±5%), and includes automotive-grade AEC-Q101 qualification. Selection depends on impedance requirements and automotive certification needs.

Q: Is MMSZ5257B-HE3-18 suitable for new designs?

A: MMSZ5257B-HE3-18 is classified as Obsolete. While electrical parameters are compatible, obsolete status indicates discontinued production. New designs should use Active alternatives: BZT52C33-7-F, DDZ33-7, or SZMMSZ5257BT1G.

Q: What packaging options are available for substitutes?

A: All substitute parts use SOD-123 surface mount package, matching the main part. Packaging formats vary: BZT52C33-7-F and MMSZ5257B-HE3-18 are supplied in Cut Tape (CT) & Digi-Reel®; BZT52B33-TP and DDZ33-7 are supplied in Tape & Reel (TR); SZMMSZ5257BT1G is supplied in Tape & Reel (TR). Verify packaging compatibility with assembly equipment.

Q: Can I use a substitute with lower power rating?

A: Yes, if circuit design permits. DDZ33-7 (310 mW) can replace BZT52B33-TP (410 mW) when actual power dissipation remains below 310 mW. Verify thermal and electrical requirements before substitution.

Q: Are automotive-qualified alternatives available?

A: Yes. SZMMSZ5257BT1G and MMSZ5257B-HE3-18 both carry AEC-Q101 automotive qualification. SZMMSZ5257BT1G is Active; MMSZ5257B-HE3-18 is Obsolete. For automotive applications, SZMMSZ5257BT1G is the recommended choice.

Q: What tolerance differences exist among substitutes?

A: BZT52B33-TP and DDZ33-7 offer tighter tolerance (±2% and ±2.5% respectively). BZT52C33-7-F, MMSZ5257B-HE3-18, and SZMMSZ5257BT1G have wider tolerance (±6%, ±5%, and ±5% respectively). Tighter tolerance parts provide more precise zener voltage regulation.

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