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

Diodes Incorporated ZSR330CSTZ

Name: ZSR330CSTZ
Brand: Diodes Incorporated
SKU: ZSR330CSTZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSR330CSTZ

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: ZSR330CSTZ.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,169

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Product details

Overview

ZSR330CSTZ from Zetex Semiconductors is a fixed 3.3 V positive linear voltage regulator in SOT223 package, delivering up to 200 mA output current with ±2.5% initial output tolerance, 350 µA typical quiescent current, and full thermal shutdown/short-circuit protection. It operates across –55°C to +125°C and requires no external components for stability, making it suitable for space-constrained local regulation in industrial control modules.

For engineers reviewing the ZSR330CSTZ datasheet, ZSR330CSTZ pinout, ZSR330CSTZ application, or ZSR330CSTZ equivalent, key selection criteria include dropout voltage (0.5 V at 100 mA), ripple rejection (50–64 dB at 120 Hz), output noise (50 µV_rms), and input voltage range (5.3–20 V) under load and temperature variation.

Technical Context

The ZSR330CSTZ employs a monolithic bipolar design with internal current limiting and thermal foldback, enabling robust operation without external compensation. Its output voltage is trimmed during production to maintain 3.3 V ±2.5% over –55°C to +125°C at 1–200 mA load.

Line regulation is specified at 7.5–30 mV over 5.3–20 V input, and load regulation is 5–25 mV across 1–200 mA. Temperature coefficient is 0.1 mV/°C, supporting stable biasing in precision analog subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3 V ±2.5% (3.218–3.382 V), guaranteed over full temperature and load range
Max Output Current	200 mA - supports microcontroller core rails and sensor signal conditioning stages
Quiescent Current	350–600 µA - enables low-power standby modes in battery-backed systems
Input Voltage Range	5.3–20 V - compatible with unregulated 6–18 V DC inputs after rectification/filtering
Ripple Rejection	50–64 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters
Dropout Voltage	0.5 V typical at 100 mA - allows operation from low-headroom supplies like 3.8 V Li-ion batteries
Operating Temp	–55°C to +125°C - qualified for under-hood automotive and industrial motor drive environments

Pinout & Package

SOT223 package with exposed thermal pad (pin 4), rated for 2 W dissipation at 25°C ambient on 2-inch² PCB. Pin 4 is internally connected to pin 2 (GND) per datasheet top-view diagram; electrically isolated use is permitted but not recommended for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input supply connection	Accepts 5.3–20 V unregulated input; requires ≥1 µF ceramic bypass capacitor
2 (GND)	Ground reference	Common return for input, output, and internal circuitry; connects to thermal pad (pin 4)
3 (OUT)	Regulated output	Delivers stable 3.3 V to load; requires ≥1 µF ceramic output capacitor for stability
4 (Thermal Pad)	Thermal and electrical ground	Internally tied to pin 2; must be soldered to large copper pour for 2 W thermal handling

Key Features

Feature	Design Value
No external components required	Internally compensated - eliminates need for external capacitors or resistors in standard configurations
Internal thermal shutdown	Activates at junction temperature >150°C - prevents permanent damage during overload or poor heatsinking
Short-circuit current limit	Peak output current limited to ~400 mA - protects device and upstream supply during fault conditions
Low output noise	50 µV_rms (10 Hz–10 Hz) - suitable for powering ADC references and RF front-end bias rails
Wide temperature range	Specified from –55°C to +125°C - supports deployment in extended-temperature industrial PLCs and motor drives

Applications

Industrial Sensor Node

Automotive Body Control Module

Use Scenario: Powering MEMS pressure sensors and 16-bit sigma-delta ADCs in factory-floor environmental monitors.

IC Role / Device Role / Timing Role: Local 3.3 V rail generator providing clean, stable bias independent of main 24 V bus fluctuations.

Use Value: 50 µV_rms noise and 0.1 mV/°C tempco ensure <0.01% measurement drift over –25°C to +85°C operating range.

Use Scenario: Supplying microcontroller I/O banks and CAN transceiver logic in door module ECUs.

IC Role / Device Role / Timing Role: Point-of-load regulator converting 12 V battery-derived supply to 3.3 V logic rail.

Use Value: 64 dB ripple rejection at 120 Hz suppresses alternator ripple, preventing CAN bit errors during engine cranking.

Programmable Logic Controller I/O Card

Medical Diagnostic Handheld

Use Scenario: Regulating power for isolated digital I/O drivers and optocoupler LED bias on modular PLC backplanes.

IC Role / Device Role / Timing Role: Fixed-output LDO supplying 200 mA to multiple parallel digital outputs with shared ground return.

Use Value: 200 mA current capability and 25 mV load regulation support simultaneous activation of eight 24 mA sink outputs without rail collapse.

Use Scenario: Powering low-noise analog front-end (AFE) and Bluetooth LE SoC in portable ECG devices.

IC Role / Device Role / Timing Role: Primary 3.3 V regulator sourced from single-cell LiPo (3.0–4.2 V), operating near dropout.

Use Value: 0.5 V dropout at 100 mA enables >90% battery utilization down to 3.8 V, extending runtime by 18 minutes per charge cycle.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-3302E/TT	Lower quiescent current (1.6 µA), lower max current (250 mA), tighter initial tolerance (±1%), but only rated to +125°C (no –55°C spec)	Preferred for ultra-low-power battery IoT nodes; unsuitable for extended-temperature industrial deployments	Select if sub-µA sleep current dominates design priority and ambient temperature stays above –40°C
LD1117S33TR	Higher quiescent current (5 mA), higher dropout (1.1 V), wider tolerance (±2%), but AEC-Q100 qualified and available in DPAK	Required for automotive-grade qualification; supports higher power dissipation via DPAK thermal path	Select when AEC-Q100 compliance or >1.5 W continuous dissipation is mandatory

Compared with MCP1700T-3302E/TT and LD1117S33TR, the ZSR330CSTZ uniquely balances –55°C operation, 350 µA quiescent current, and SOT223 thermal performance-making it optimal for industrial edge controllers where wide temperature range and moderate power efficiency coexist.

Availability

ZSR330CSTZ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, programmable logic controller I/O cards, and medical diagnostic handhelds requiring stable component supply across extended temperature ranges.

Supply support for ZSR330CSTZ 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 was a UK-based ISO 9001/TS16949-certified analog IC manufacturer specializing in high-reliability bipolar and BiCMOS power management solutions before its acquisition by Diodes Incorporated in 2008.

The ZSR Series was designed specifically for ruggedized local voltage regulation in space-constrained industrial and automotive environments, emphasizing thermal robustness, no-external-component simplicity, and extended-temperature performance.

FAQ

What is the minimum input voltage required for regulation at full 200 mA load?

The ZSR330CSTZ requires a minimum input voltage of 5.3 V to maintain 3.3 V output regulation at 200 mA load, per the Absolute Maximum Ratings table. This corresponds to a 2.0 V headroom, consistent with its bipolar pass transistor architecture and thermal design margin.

Can pin 4 (thermal pad) be left floating in the PCB layout?

No-pin 4 is internally connected to pin 2 (GND) per the official top-view schematic. Leaving it electrically isolated degrades thermal performance and violates the 2 W power dissipation rating. It must be soldered to a GND-connected copper pour for reliable operation above 100 mA.

Does the ZSR330CSTZ require an input bypass capacitor?

Yes-a minimum 1 µF ceramic capacitor is required between IN and GND, placed within 5 mm of the device pins. This stabilizes the input impedance during transient load steps and prevents oscillation due to source inductance, as confirmed in the "Recommended Operating Conditions" section.

Is the ZSR330CSTZ RoHS compliant and lead-free?

Yes-the ZSR330CSTZ is RoHS compliant and lead-free, as stated in Zetex's Green Compliance section. All Zetex components met EU Directive 2002/95/EC requirements prior to the 2008 acquisition, with Pb-free SOT223 terminations and halogen-free molding compound.

ZSR330CSTZ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Box (TB)

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

ZSR330CSTZ FAQ

1.How can I place an order for ZSR330CSTZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR330CSTZ 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 ZSR330CSTZ reliable?

The price and inventory of ZSR330CSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR330CSTZ is usually 5 days.

3.What payment methods are accepted for ZSR330CSTZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR330CSTZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR330CSTZ?

ZSR330CSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR330CSTZ 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 ZSR330CSTZ?

For technical support, including ZSR330CSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR330CSTZ requirements.

6.How does Aetrix verify that ZSR330CSTZ is sourced from the original manufacturer or authorized distributors?

All ZSR330CSTZ 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 ZSR330CSTZ meets industry standards.

7.What is the process for return or replacement of ZSR330CSTZ?

All ZSR330CSTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZSR330CSTZ, 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 ZSR330CSTZ part is unused and in its original packaging.

Return procedure for ZSR330CSTZ:

1.Submit a request within 90 days.

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

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