GDZ3V3B-G3-08 Equivalent & Substitute Parts

Part Overview

The GDZ3V3B-G3-08 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 3.3 V nominal with 200 mW maximum power dissipation in a surface mount SOD-323 package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±2%	—
Power - Max	200	mW
Impedance (Max)	120	Ohms
Current - Reverse Leakage @ Vr	20	µA @ 1 V
Operating Temperature Range	-55 to 150	°C
Package / Case	SC-76, SOD-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the GDZ3V3B-G3-08 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 3.3 V (exact match required)
Package / Case: SOD-323 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)

Secondary Compatibility Parameters:

Power - Max: 200 mW or greater (equal or higher rating acceptable)
Tolerance: ±2% or wider (equal or wider tolerance acceptable)
Impedance (Max): 120 Ohms or lower (equal or lower impedance acceptable)
Operating Temperature Range: -55°C to 150°C minimum (equal or wider range acceptable)
RoHS Status: ROHS3 Compliant (regulatory requirement)

Substitute parts are grouped into two categories based on power rating: parts rated at 200 mW (direct equivalents) and parts rated above 200 mW (higher power alternatives). All substitute parts maintain the 3.3 V nominal zener voltage and SOD-323 package specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom) (V)	Tolerance	Power - Max (mW)	Impedance (Max) (Ohms)	Current - Reverse Leakage @ Vr (µA @ 1 V)	Operating Temperature (°C)	Package
GDZ3V3B-G3-08	Vishay General Semiconductor	3.3	±2%	200	120	20	-55 to 150	SOD-323
BZT52C3V3SQ-7-F	Diodes Incorporated	3.3	±6.06%	200	95	5	-65 to 150	SOD-323
CMDZ3L3 TR PBFREE	Central Semiconductor Corp	3.3	±5%	250	900	5	-65 to 150	SOD-323
CMDZ5226B TR PBFREE	Central Semiconductor Corp	3.3	±5%	250	28	25	-65 to 150	SOD-323
MM3Z3V3ST1G	onsemi	3.3	±3%	300	95	5	-65 to 150	SOD-323
MM3Z3V3T1G	onsemi	3.3	±6%	300	95	5	-65 to 150	SOD-323
PZU3.3B2A,115	Nexperia USA Inc.	3.3	±2%	320	95	5	-55 to 150	SOD-323
SZMM3Z3V3ST1G	onsemi	3.3	±3%	300	95	5	-65 to 150	SOD-323
SZMM3Z3V3T1G	onsemi	3.3	±5%	300	95	5	-65 to 150	SOD-323

Engineering Selection Recommendations

Direct Equivalent (200 mW Power Rating):

The BZT52C3V3SQ-7-F from Diodes Incorporated is the only substitute part with identical 200 mW power rating. This part carries AEC-Q101 automotive qualification and operates across an extended temperature range of -65°C to 150°C, exceeding the GDZ3V3B-G3-08 specification. The impedance is lower at 95 Ohms compared to 120 Ohms, and reverse leakage current is reduced to 5 µA. All RoHS3 and regulatory compliance requirements are met.

Higher Power Alternatives (250 mW and 300 mW Ratings):

Parts with power ratings above 200 mW provide additional thermal margin and are suitable for applications where the GDZ3V3B-G3-08 supply is unavailable. These include:

CMDZ3L3 TR PBFREE and CMDZ5226B TR PBFREE (250 mW, Central Semiconductor Corp)
MM3Z3V3ST1G, MM3Z3V3T1G, SZMM3Z3V3ST1G, and SZMM3Z3V3T1G (300 mW, onsemi)
PZU3.3B2A,115 (320 mW, Nexperia USA Inc.)

All substitute parts maintain the 3.3 V nominal zener voltage, SOD-323 package, surface mount configuration, and RoHS3 compliance. Operating temperature ranges extend to -65°C minimum for most alternatives, providing broader environmental coverage than the original part's -55°C minimum.

The SZMM3Z3V3ST1G and SZMM3Z3V3T1G variants from onsemi carry AEC-Q101 automotive qualification, suitable for automotive applications requiring certified components.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating than the GDZ3V3B-G3-08?

A: Yes. The GDZ3V3B-G3-08 is rated at 200 mW. Substitute parts with 250 mW or 300 mW ratings are electrically compatible and provide additional thermal headroom. The zener voltage remains 3.3 V, and the SOD-323 package is identical. Higher power ratings do not degrade circuit performance in applications designed for 200 mW operation.

Q: What is the significance of tolerance differences between the main part and substitutes?

A: The GDZ3V3B-G3-08 has ±2% tolerance. Substitute parts with wider tolerances (±3%, ±5%, ±6%, ±6.06%) are acceptable in applications where the circuit design accommodates the full tolerance band. Narrower tolerance is always preferable but not required for substitution. Verify circuit performance across the substitute part's tolerance range if precision is critical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the GDZ3V3B-G3-08.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both packaging formats contain identical components in SOD-323 packages. Cut Tape is supplied in smaller quantities on individual tape strips, while Tape & Reel is supplied on continuous reels for high-volume automated assembly. Electrical and mechanical specifications are identical. Selection depends on production volume and assembly equipment compatibility.

Q: Can I substitute the GDZ3V3B-G3-08 with a part having lower impedance?

A: Yes. Lower impedance values (such as 28 Ohms in CMDZ5226B TR PBFREE or 95 Ohms in multiple onsemi parts) are acceptable substitutes. Lower impedance indicates better voltage regulation characteristics and is not detrimental to circuit operation. The original part's 120 Ohms impedance is not a limiting factor for substitution.

Q: Which substitute part is recommended for automotive applications?

A: The BZT52C3V3SQ-7-F (Diodes Incorporated), SZMM3Z3V3ST1G, and SZMM3Z3V3T1G (onsemi) carry AEC-Q101 automotive qualification. These parts are suitable for automotive-grade applications requiring certified components.

Q: What is the operating temperature range difference between the main part and substitutes?

A: The GDZ3V3B-G3-08 operates from -55°C to 150°C. Most substitute parts extend the minimum temperature to -65°C, providing 10°C additional cold-temperature margin. The maximum temperature of 150°C is consistent across all parts. Extended temperature range does not affect substitution compatibility.

Q: Is the reverse leakage current specification critical for substitution?

A: Reverse leakage current affects standby power consumption and circuit performance in high-impedance applications. The GDZ3V3B-G3-08 specifies 20 µA at 1 V. Most substitute parts have lower leakage at 5 µA, which improves performance. Higher leakage values are acceptable if circuit design accommodates the specification. Verify leakage requirements for precision applications.

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