ZSR330C Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The ZSR330C is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 3.3V output at 200mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The ZSR330C serves applications requiring low-dropout regulation with thermal and short-circuit protection in compact through-hole configurations.

Substiute Parts

ZSR330C

Diodes IncorporatedIn Stock: 757ZSR330C Datasheet

Current PartRFQ

LP2950CZ-3.3/NOPB

Texas InstrumentsIn Stock: 6291LP2950CZ-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZSR330C is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• TO-92-3 package configuration for through-hole mounting
• Positive output configuration
• Protection against over-temperature and short-circuit conditions
• Operating temperature range compatibility

The LP2950CZ-3.3/NOPB qualifies as a direct substitute based on matching output voltage, package type, and protection features. While the LP2950CZ-3.3/NOPB has a lower maximum output current (100mA versus 200mA), it maintains the same package footprint and electrical interface, making it suitable for applications where the reduced current rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

The LP2950CZ-3.3/NOPB is the manufacturer-recommended substitute for the ZSR330C. Selection of this substitute should be based on the following engineering criteria:

Current Rating Compatibility: The substitute part is rated for 100mA maximum output current, compared to the original 200mA specification. Applications requiring the full 200mA output must verify that actual load current does not exceed 100mA.

Compliance Status: The LP2950CZ-3.3/NOPB is ROHS3 compliant and carries active product status, ensuring long-term availability and regulatory compliance. The ZSR330C is non-compliant and obsolete.

Temperature Range: The substitute operates from -40°C to 125°C, compared to the original -55°C to 125°C. Applications requiring operation below -40°C require alternative solutions.

Electrical Performance: The substitute provides improved quiescent current (120 µA versus 600 µA) and specified dropout voltage (0.6V @ 100mA), offering better power efficiency in battery-powered applications.

Frequently Asked Questions (FAQ)

Q: Can the LP2950CZ-3.3/NOPB directly replace the ZSR330C in existing designs?

A: Direct replacement is possible if the application load current does not exceed 100mA and the minimum operating temperature requirement is -40°C or higher. The TO-92-3 package pinout is identical, requiring no PCB modifications.

Q: What is the primary limitation of using the LP2950CZ-3.3/NOPB as a substitute?

A: The maximum output current is reduced from 200mA to 100mA. Applications designed for the full 200mA capability must be re-evaluated or alternative regulators selected.

Q: Are there compliance differences between the two parts?

A: Yes. The LP2950CZ-3.3/NOPB is ROHS3 compliant with active product status, while the ZSR330C is non-compliant and obsolete. New designs should use the compliant substitute.

Q: Does the substitute require any circuit modifications?

A: No circuit modifications are required. Both parts use identical TO-92-3 pinouts and operate as fixed 3.3V regulators. Existing bypass capacitor recommendations should be verified with the LP2950CZ-3.3/NOPB datasheet.

Q: What is the impact of the lower quiescent current in the substitute?

A: The LP2950CZ-3.3/NOPB draws 120 µA versus 600 µA for the ZSR330C, resulting in reduced standby power consumption. This is beneficial for battery-powered and low-power applications.

Q: Can the LP2950CZ-3.3/NOPB handle the full 20V input specification of the ZSR330C?

A: The LP2950CZ-3.3/NOPB is rated for 30V maximum input, exceeding the ZSR330C specification of 20V. Both parts are compatible with input voltages up to 20V.