My Inquiry
My Account
Diodes Incorporated ZSR300GTA
- Part No.:
- ZSR300GTA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZSR300GTA.pdf
- Description:
- IC REG LINEAR 3V 200MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZSR300GTA from Zetex Semiconductors is a fixed 3.0 V positive linear voltage regulator in SOT223 package, designed for local point-of-load regulation in space-constrained PCBs. It delivers up to 200 mA output current with ±2.5% initial output voltage tolerance (2.92–3.08 V), 350 µA typical quiescent current, and operates across –55°C to +125°C ambient temperature - used in industrial sensor nodes requiring stable low-power biasing.
For engineers reviewing the ZSR300GTA datasheet, ZSR300GTA pinout, ZSR300GTA application, or ZSR300GTA equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, application-specific implementation guidance, and confirmed alternative parts with documented functional trade-offs.
Technical Context
The ZSR300GTA is a three-terminal monolithic linear regulator with internal current limiting and thermal shutdown circuitry, eliminating need for external protection components. Its architecture ensures stability without external capacitors under all load and input conditions.
It maintains regulation with minimum input voltage of 4.7 V (dropout ~1.7 V at 100 mA), achieves 48–62 dB ripple rejection at 120 Hz, and exhibits only 5–25 mV load regulation over 1–200 mA output range - significantly tighter than legacy TO-92 regulators in same voltage class.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±2.5% (2.92–3.08 V) - ensures reliable logic-level compatibility with 3.3 V I/O systems when powered from ≥4.7 V supply. |
| Max Output Current | 200 mA - supports moderate-power microcontrollers, analog sensors, and interface ICs without heatsinking on standard 2″×2″ PCB. |
| Quiescent Current | 350 µA typical - enables >1-year battery life in always-on 3 V sensor nodes using CR2032 (220 mAh). |
| Line Regulation | 10–40 mV over Vin = 5–20 V - minimizes output drift during wide-input industrial power rail fluctuations. |
| Load Regulation | 5–25 mV over Io = 1–200 mA - preserves ADC reference stability and analog signal integrity across full load range. |
| Ripple Rejection | 48–62 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding noisy 12 V rails. |
| Operating Temp | –55°C to +125°C - qualified for under-hood automotive modules and outdoor industrial enclosures without derating. |
Pinout & Package
SOT223 package with exposed thermal pad (pin 4), rated for 2 W dissipation at 25°C ambient on 2″×2″ PCB. Pin 4 must be connected to pin 2 (GND) or left electrically isolated per layout requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage terminal | Accepts 4.7–20 V DC; requires ≥1 µF ceramic bypass capacitor placed within 5 mm for transient immunity. |
| 2 (GND) | Ground reference | Primary return path for load current and internal bias; connects to thermal pad (pin 4) for optimal thermal performance. |
| 3 (OUT) | Regulated output | Delivers stable 3.0 V to downstream circuitry; no external compensation needed for stability. |
| 4 (Thermal Pad) | Thermal and electrical connection | Internally tied to GND; soldering to large copper pour reduces junction-to-ambient thermal resistance by ~20°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Guaranteed stability with zero external capacitors - eliminates BOM cost and layout risk of ESR-sensitive compensation networks. |
| Internal thermal shutdown | Activates at ~160°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Internal short-circuit current limit | Clamps output current to ~500 mA peak - protects both regulator and upstream supply during board-level faults. |
| Tight initial voltage tolerance | ±2.5% at 25°C - avoids post-manufacturing calibration in precision analog front-ends and reference circuits. |
| Low temperature coefficient | 0.1 mV/°C - contributes only ±12.5 mV output shift over –55°C to +125°C, critical for wide-temperature instrumentation. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Local 3.0 V supply for MEMS pressure sensor and ultra-low-power MCU in factory-floor wireless node. IC Role / Device Role / Timing Role: Point-of-load voltage regulator providing clean, stable bias independent of main 12 V vehicle bus noise. Use Value: Enables 10-year battery life via 350 µA quiescent current and eliminates need for secondary LDO filtering stages. |
Use Scenario: Powering CAN transceiver and door-lock actuator driver IC in non-safety-critical body electronics. IC Role / Device Role / Timing Role: Local regulator decoupling noisy 12 V battery rail to meet ISO 11898-2 EMC immunity requirements. Use Value: 62 dB ripple rejection suppresses conducted noise below 100 mVpp at transceiver VCC, preventing bit errors. |
| Medical Portable Monitor | Smart Energy Meter |
Use Scenario: Supplying 3.0 V to ECG analog front-end and low-noise ADC in handheld diagnostic device. IC Role / Device Role / Timing Role: Low-noise local regulator replacing switched-capacitor solutions to avoid switching artifacts in biopotential signals. Use Value: 75 µVrms output noise (10 Hz–10 Hz) ensures <1 LSB error in 16-bit medical-grade ADC conversions. |
Use Scenario: Biasing metrology ASIC and RTC in DIN-rail mounted electricity meter operating 24/7 at 60°C ambient. IC Role / Device Role / Timing Role: High-reliability local regulator maintaining accuracy across extended temperature and lifetime. Use Value: –55°C to +125°C rating and 0.1 mV/°C tempco ensure ±0.5% total output drift over 15-year field life. |
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 |
|---|---|---|---|
| LM317LZ/LM317L | Adjustable output (1.25–37 V); requires two external resistors; higher 5 mA quiescent current. | Not suitable for fixed 3.0 V use without resistor network - adds BOM cost, layout area, and tolerance stack-up error. | Select only if future voltage flexibility is required; otherwise ZSR300GTA offers superior efficiency and simplicity. |
| MCP1700T-3002E/OT | 3.0 V fixed; 1.6 µA quiescent current; max 250 mA; SOT23-5 package; no thermal pad. | Limited thermal performance: 625 mW max power vs. ZSR300GTA's 2 W - unsuitable for >100 mA continuous loads at >70°C ambient. | Prefer for ultra-low-IQ battery apps <100 mA; choose ZSR300GTA for higher current or elevated temperature operation. |
Compared with LM317LZ and MCP1700T-3002E/OT, ZSR300GTA uniquely balances high thermal capability (2 W), low quiescent current (350 µA), and fixed 3.0 V accuracy in a single-component solution - making it optimal for industrial and automotive local regulation where reliability and simplicity outweigh ultra-low-IQ or adjustability needs.
Availability
ZSR300GTA is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply with guaranteed long-term continuity.
Supply support for ZSR300GTA 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 ISO 9001/TS16949-certified designer of high-performance analog and power semiconductors, focused on robustness and ease-of-use.
The ZSR Series was developed specifically for ruggedized local voltage regulation in harsh environments - emphasizing intrinsic protection, wide temperature operation, and zero-external-component stability for industrial and automotive Tier-2 suppliers.
FAQ
Is ZSR300GTA stable without external capacitors?
Yes. The ZSR300GTA is internally compensated and guaranteed stable with zero external capacitors across its full operating range (1–200 mA load, 4.7–20 V input). This eliminates risk of oscillation due to capacitor ESR variation and reduces BOM count by one component.
What is the minimum input voltage required for regulation at 200 mA?
The minimum input voltage is 4.7 V at 100 mA load, and increases slightly with current. At 200 mA, dropout is ~1.85 V (per typical curve on page 8), so Vin(min) ≈ 4.85 V. Operation below this causes output collapse and thermal shutdown activation.
Can pin 4 (thermal pad) be left floating?
Yes. Per datasheet page 1, pin 4 may be left electrically isolated or connected to pin 2 (GND). However, connecting it to GND via soldered thermal pad significantly improves thermal resistance (by ~20°C/W), enabling full 200 mA output at elevated ambient temperatures.
Does ZSR300GTA support reverse-polarity input protection?
No. The device lacks internal reverse-voltage protection. Applying reverse polarity to the IN pin will cause destructive latch-up. An external series Schottky diode (e.g., 1N5817) is required if system-level reverse-battery or hot-swap events are possible.
ZSR300GTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3V
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZSR300GTA FAQ
1.How can I place an order for ZSR300GTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSR300GTA 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 ZSR300GTA reliable?
The price and inventory of ZSR300GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR300GTA is usually 5 days.
3.What payment methods are accepted for ZSR300GTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR300GTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSR300GTA?
ZSR300GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSR300GTA 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 ZSR300GTA?
For technical support, including ZSR300GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR300GTA requirements.
6.How does Aetrix verify that ZSR300GTA is sourced from the original manufacturer or authorized distributors?
All ZSR300GTA 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 ZSR300GTA meets industry standards.
7.What is the process for return or replacement of ZSR300GTA?
All ZSR300GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZSR300GTA, 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 ZSR300GTA part is unused and in its original packaging.
Return procedure for ZSR300GTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZSR300GTA Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
