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

Diodes Incorporated ZSR285CL

Name: ZSR285CL
Brand: Diodes Incorporated
SKU: ZSR285CL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSR285CL

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: ZSR285CL.pdf

Description:: IC REG LINEAR 2.85V 200MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,037

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Product details

Overview

ZSR285CL from Zetex Semiconductors is a fixed positive 2.85 V 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, 350 µA typical quiescent current, and operates across –55°C to +125°C. Used in embedded microcontroller power rails and sensor signal conditioning circuits where low dropout and thermal robustness are required.

For engineers reviewing the ZSR285CL datasheet, ZSR285CL pinout, ZSR285CL application, or ZSR285CL equivalent, this page provides verified electrical specifications, thermal derating guidance, real-world load/line regulation behavior, and validated alternatives for industrial and automotive-grade local regulation designs.

Technical Context

The ZSR285CL employs a monolithic bipolar architecture with internal current limiting and thermal shutdown circuitry, enabling self-protection under overload or fault conditions without external components. Its dropout voltage remains below 450 mV at 200 mA and 25°C, and its output voltage temperature coefficient is tightly controlled at 0.1 mV/°C (typical).

It achieves 48–62 dB ripple rejection at 120 Hz with input voltage ranging from 4.85 V to 20 V, and maintains regulation stability over full load (1–200 mA) and temperature (–55°C to +125°C) ranges. No external capacitors are required for stability, though a ≥1 µF input capacitor is recommended to suppress transients during thermal shutdown events.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.85 V ±2.5% (2.735–2.964 V over full load/temp range)
Max Output Current	200 mA - supports logic-level MCU cores and analog sensors
Quiescent Current	350 µA typ., 600 µA max - enables low-power standby operation
Input Voltage Range	4.85 V to 20 V - compatible with 5 V, 12 V, and 15 V supply rails
Line Regulation	10–40 mV - minimal output shift across input variation
Load Regulation	5–25 mV (1–200 mA) - stable output under dynamic load steps
Ripple Rejection	48–62 dB at 120 Hz - effective suppression of rectified AC noise
Operating Temp	–55°C to +125°C - qualified for extended industrial and under-hood use

Pinout & Package

Package: SOT223 (4-pin, high-power surface-mount); Pin 4 is internally connected to Pin 2 (GND) or may be left electrically isolated per design requirements.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (IN)	Input voltage supply	Accepts 4.85–20 V DC; requires ≥1 µF ceramic bypass capacitor for transient immunity
Pin 2 (GND)	Ground reference	Main power return path; also connects to exposed thermal pad (Pin 4) when used
Pin 3 (OUT)	Regulated output	Delivers stable 2.85 V to load; no external compensation needed
Pin 4 (Thermal Pad)	Thermal and electrical connection	Internally tied to GND; improves thermal dissipation when soldered to PCB copper area

Key Features

Feature	Design Value
No external components required	Guaranteed stability with zero external capacitors or resistors
Internal thermal shutdown	Activates at junction temperature >150°C; auto-recovers after cooldown
Short-circuit current limit	Peak output current limited to ~400 mA (typ.) at 25°C; reduces at elevated temp
Tight initial tolerance	±2.5% output accuracy eliminates need for post-production trimming
Low-noise operation	75 µV_rms output noise (10 Hz–10 Hz bandwidth) preserves ADC/Sensor SNR

Applications

Industrial PLC I/O Modules

Automotive Body Control Units

Use Scenario: Powering isolated 2.85 V ADC reference and analog front-end in modular I/O cards.

IC Role / Device Role / Timing Role: Local voltage regulator providing clean, stable bias for precision measurement circuitry.

Use Value: Maintains <±0.5% output drift over –40°C to +85°C ambient, ensuring consistent 12-bit ADC accuracy without recalibration.

Use Scenario: Supplying 2.85 V to LIN transceiver interface ICs and EEPROMs in door module ECUs.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering fault-tolerant power under battery voltage fluctuations (9–16 V).

Use Value: Withstands 20 V transients and shuts down safely during short-circuit faults-no latch-up or damage observed in qualification testing.

Medical Portable Monitors

Smart Energy Meters

Use Scenario: Regulating power for low-power ECG amplifier stages and OLED display bias in handheld diagnostics.

IC Role / Device Role / Timing Role: Low-quiescent-current local regulator enabling >100-hour battery life in sleep mode.

Use Value: 350 µA typical I_Q minimizes standby drain while maintaining fast wake-up response (<10 µs output stabilization).

Use Scenario: Providing 2.85 V rail for metrology ADCs and RTC backup in DIN-rail mounted electricity meters.

IC Role / Device Role / Timing Role: High-temperature-stable regulator operating continuously at 70°C ambient inside sealed enclosures.

Use Value: Guaranteed operation to +125°C junction temperature with linear derating-no output collapse or parameter shift observed at 85°C case temp.

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
TLV700285DBVR	Lower I_Q (30 µA), but only rated to 85°C ambient; 150 mA max output	Suitable for battery-powered consumer devices, not extended-temp industrial use	Choose if ultra-low I_Q dominates and temperature range ≤85°C
MCP1702T-285I/TT	Higher dropout (600 mV @ 250 mA), wider V_IN range (2.7–13.2 V), RoHS-compliant	Better for low-input-voltage systems (e.g., single-cell Li-ion), less robust at high temp	Prefer when input voltage is <5 V or RoHS compliance is mandatory

Compared with TLV700285DBVR and MCP1702T-285I/TT, the ZSR285CL offers superior high-temperature operation (125°C), higher output current (200 mA), and tighter line/load regulation-making it the only choice for ruggedized industrial and automotive local regulation where thermal margin and precision are critical.

Availability

ZSR285CL is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical portable monitors, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ZSR285CL 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 and TS16949 certified designer of high-reliability analog and power semiconductor solutions before its acquisition by Diodes Incorporated in 2008.

The ZSR Series was developed specifically for robust local voltage regulation in harsh environments-emphasizing thermal resilience, fault tolerance, and minimal external component count for space-constrained industrial and automotive PCBs.

FAQ

Is ZSR285CL still in production?

No-ZSR285CL is an obsolete part per Zetex's Issue 9 datasheet (October 2007). It is no longer manufactured, but Aetrix Electronics maintains legacy inventory with full traceability and supports obsolescence mitigation through cross-reference analysis and drop-in alternatives where technically validated.

What is the maximum power dissipation of ZSR285CL in SOT223?

At 25°C ambient, maximum power dissipation is 2 W assuming a 2-inch-square PCB copper area. Derating is linear to zero at 125°C ambient. At 85°C ambient, usable power drops to ~1.2 W-requiring careful thermal design for 200 mA loads at high ambient temperatures.

Does ZSR285CL require an input capacitor?

ZSR285CL is unconditionally stable without external capacitors. However, a ≥1 µF ceramic capacitor across IN–GND is strongly advised to absorb voltage transients during thermal shutdown events-especially when powered from inductive sources like switch-mode supplies or long cables.

Can ZSR285CL be used with 3.3 V input?

No-minimum input voltage to maintain 2.85 V regulation is 4.85 V (specified in datasheet). At 3.3 V input, the device enters dropout and cannot regulate; output collapses to ~2.4 V or lower depending on load. A minimum 4.85 V input is mandatory for specified performance.

ZSR285CL 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):: 2.85V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 200mA

Current - Quiescent (Iq):: 600 µA

Current - Supply (Max):: -

PSRR:: 62dB (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

ZSR285CL FAQ

1.How can I place an order for ZSR285CL through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR285CL 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 ZSR285CL reliable?

The price and inventory of ZSR285CL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR285CL is usually 5 days.

3.What payment methods are accepted for ZSR285CL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR285CL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR285CL?

ZSR285CL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR285CL 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 ZSR285CL?

For technical support, including ZSR285CL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR285CL requirements.

6.How does Aetrix verify that ZSR285CL is sourced from the original manufacturer or authorized distributors?

All ZSR285CL 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 ZSR285CL meets industry standards.

7.What is the process for return or replacement of ZSR285CL?

All ZSR285CL units undergo pre-shipment inspection (PSI). If there is an issue with ZSR285CL, 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 ZSR285CL part is unused and in its original packaging.

Return procedure for ZSR285CL:

1.Submit a request within 90 days.

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

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