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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated ZSR330C

Name: ZSR330C
Brand: Diodes Incorporated
SKU: ZSR330C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSR330C

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: ZSR330C.pdf

Description:: IC REG LINEAR 3.3V 200MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,360

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Product details

Overview

ZSR330C from Zetex Semiconductors is a fixed 3.3 V positive linear voltage regulator in SOT223 package, designed for local regulation in space-constrained PCBs. It delivers up to 200 mA output current with ±2.5% initial output voltage tolerance (3.218–3.382 V), 350–600 µA quiescent current, and operates across –55°C to +125°C. It is used in embedded microcontroller power rails where low-noise, stable local supply and thermal robustness are critical.

For engineers reviewing the ZSR330C datasheet, ZSR330C pinout, ZSR330C application, or ZSR330C equivalent, this page provides verified electrical specifications, thermal derating guidance, ripple rejection (50–64 dB at 120 Hz), dropout behavior, and real-world substitution options - all validated against Zetex Issue 9 (October 2007) datasheet.

Technical Context

The ZSR330C integrates internal current limiting and thermal shutdown circuitry, enabling fault resilience without external protection components. Its architecture eliminates need for output capacitance stabilization, supporting operation with zero external parts while maintaining regulation under load steps from 1 mA to 200 mA.

It requires minimum input voltage of 5.3 V to sustain 3.3 V output under full load, with line regulation of 7.5–30 mV over Vin = 5.3–20 V and load regulation of 5–25 mV over IO = 1–200 mA. Output noise is 50 µV_rms (10 Hz–10 Hz), and temperature coefficient is 0.1 mV/°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3 V nominal; 3.168–3.432 V over full load/temp range - ensures logic-level compatibility with 3.3 V I/O systems
Max Output Current	200 mA - sufficient for powering MCU cores, sensors, or small peripherals without heatsinking
Quiescent Current	350–600 µA - enables low-power standby modes in battery-backed or energy-sensitive designs
Ripple Rejection	50–64 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the regulator
Dropout Voltage	Typ. 0.5 V at 100 mA (Tj=25°C); rises with temperature - defines minimum Vin–Vout headroom needed for regulation
Operating Temp	–55°C to +125°C - supports industrial, automotive under-hood, and extended-temperature embedded deployments
Thermal Shutdown	Activates above design limit (exact threshold not specified, but functional up to 125°C ambient) - prevents catastrophic failure during overload or poor PCB thermal design

Pinout & Package

SOT223 package (suffix C), high-power surface-mount outline with exposed thermal pad (pin 4). Pin 4 is internally connected to pin 2 (GND) in standard mounting; may be left electrically isolated if thermal pad is not soldered.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage terminal	Accepts 5.3–20 V DC; must exceed dropout voltage plus output to maintain regulation
2 (GND)	Ground reference	Common return for input, output, and internal circuitry; connects to thermal pad (pin 4) in standard layout
3 (OUT)	Regulated output	Delivers stable 3.3 V ±2.5%; no external capacitor required for stability
4 (Tab)	Thermal pad / GND extension	Electrically tied to pin 2; enhances thermal dissipation - recommended to solder to large copper pour

Key Features

Feature	Design Value
No external components required	Internally compensated - eliminates need for output capacitor or feedback network, reducing BOM count and board area
Tight initial tolerance	±2.5% output voltage accuracy - avoids post-production trimming and simplifies system-level voltage margining
Low quiescent current	350 µA typical - minimizes standby power loss in always-on subsystems such as RTC or wake-up circuitry
Full thermal protection	Integrated thermal shutdown - autonomously disables output above safe junction temperature, eliminating need for discrete thermal monitoring
Robust short-circuit immunity	Internal current limit - sustains indefinite short-circuit condition without damage, enabling fail-safe power domain isolation

Applications

Industrial PLC I/O Module

Automotive Body Control Unit

Use Scenario: Powering isolated 3.3 V digital I/O buffers and level-shifters in modular PLC backplanes subject to wide ambient temperature swings.

IC Role / Device Role / Timing Role: Local point-of-load regulator providing clean, stable supply independent of main 24 V rail noise and dropouts.

Use Value: Maintains 3.3 V output within ±2.5% across –40°C to +85°C operating range while rejecting >50 dB of 120 Hz ripple from upstream AC/DC converter.

Use Scenario: Supplying CAN transceiver and microcontroller core in door module electronics exposed to under-dash thermal cycling.

IC Role / Device Role / Timing Role: Primary 3.3 V regulator for low-power MCU and interface ICs, operating directly from vehicle battery (9–16 V).

Use Value: Delivers 200 mA with <600 µA quiescent current and survives 125°C ambient via SOT223 thermal pad, meeting OEM thermal derating requirements.

Medical Sensor Node

POS Terminal Peripheral Interface

Use Scenario: Regulating power for ultra-low-noise analog front-end (AFE) and ADC in portable patient monitoring sensor pods.

IC Role / Device Role / Timing Role: Low-noise local regulator minimizing supply-induced errors in 16-bit biomedical signal chains.

Use Value: 50 µV_rms output noise and 0.1 mV/°C tempco ensure sub-LSB drift in precision measurements across clinical temperature range.

Use Scenario: Powering smart card reader IC and USB PHY in retail point-of-sale terminals with limited PCB real estate.

IC Role / Device Role / Timing Role: Compact, self-protected 3.3 V source replacing larger TO-220 regulators in dense peripheral modules.

Use Value: SOT223 footprint saves >70% board area vs. through-hole alternatives while delivering identical 200 mA capability and thermal safety.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM1117MPX-3.3/NOPB	Higher quiescent current (5 mA typ), lower max current (800 mA), TO-220/SOT-223 options, requires 10 µF output cap	Supports higher load currents but consumes ~14× more quiescent current - unsuitable for low-power sleep modes	Select only when >200 mA output or adjustable version needed; verify stability with required output capacitance
MCP1700T-3302E/TT	Lower IQ (1.6 µA), lower max current (250 mA), SOT-23 package, tighter initial tolerance (±0.4%), but no thermal shutdown	Lacks internal thermal protection - requires external thermal design oversight and cannot survive sustained short-circuit	Prefer for ultra-low-power always-on circuits where thermal faults are mitigated by system architecture

Compared with ZSR330C, LM1117MPX-3.3 offers higher output current but sacrifices efficiency in standby; MCP1700T-3302E/TT improves quiescent performance and accuracy but removes fault protection - making ZSR330C optimal for thermally unmanaged, medium-current local regulation where robustness is prioritized.

Availability

ZSR330C is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical sensor nodes, and POS terminal peripheral interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZSR330C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Zetex Semiconductors plc (now part of Diodes Incorporated) was a UK-based designer of high-performance analog and power semiconductors, ISO 9001 and TS16949 certified, focused on rugged, application-optimized devices.

The ZSR Series was developed specifically for local voltage regulation in harsh environments - emphasizing thermal resilience, fault tolerance, and minimal external component count in compact SMT packages.

FAQ

Is ZSR330C still in active production?

No - ZSR330C is an obsolete part per Zetex Issue 9 datasheet status key. It was discontinued and replaced by newer Zetex/Diodes regulator families. Aetrix Electronics maintains legacy inventory and offers cross-reference support for form-fit-function replacements with documented parametric alignment.

What is the maximum power dissipation for ZSR330C in SOT223?

Maximum power dissipation is 2 W at 25°C ambient, linearly derated to zero at 125°C. At 100 mA load and 12 V input, power dissipation is ~0.87 W - well within safe limits on a 2-inch² PCB with standard copper pour, assuming proper thermal pad soldering.

Does ZSR330C require an input bypass capacitor?

While not mandatory for stability, Zetex recommends ≥1 µF ceramic capacitor across IN–GND to suppress input transients - especially when thermal shutdown activates due to inductive source coupling. This prevents input voltage overshoot beyond the 20 V absolute maximum rating.

Can ZSR330C be used with input voltages below 5.3 V?

No - minimum input voltage is 5.3 V to maintain 3.3 V output at full 200 mA load. At lower inputs, output drops out of regulation. For lower VIN applications, consider low-dropout alternatives like AP2112K-3.3 or TPS7A0533, which specify dropout <200 mV at 200 mA.

ZSR330C Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 20V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 200mA

Current - Quiescent (Iq):: 600 µA

Current - Supply (Max):: -

PSRR:: 64dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZSR330C FAQ

1.How can I place an order for ZSR330C through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR330C on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZSR330C reliable?

The price and inventory of ZSR330C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR330C is usually 5 days.

3.What payment methods are accepted for ZSR330C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR330C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR330C?

ZSR330C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR330C order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZSR330C?

For technical support, including ZSR330C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR330C requirements.

6.How does Aetrix verify that ZSR330C is sourced from the original manufacturer or authorized distributors?

All ZSR330C products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZSR330C meets industry standards.

7.What is the process for return or replacement of ZSR330C?

All ZSR330C units undergo pre-shipment inspection (PSI). If there is an issue with ZSR330C, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZSR330C part is unused and in its original packaging.

Return procedure for ZSR330C:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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