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Diodes Incorporated ZSR520GTA
- Part No.:
- ZSR520GTA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZSR520GTA.pdf
- Description:
- IC REG LINEAR 5.2V 200MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
ZSR520GTA from Zetex Semiconductors is a fixed positive 5.2 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 (5.07–5.33 V), 350–600 µA quiescent current, and operates across –55°C to +125°C. It is used in industrial control modules where stable low-noise local supply is required despite input ripple or load transients.
For engineers reviewing the ZSR520GTA datasheet, ZSR520GTA pinout, ZSR520GTA application, or ZSR520GTA equivalent, key selection criteria include dropout behavior at 200 mA, thermal shutdown response under short-circuit, ripple rejection at 120 Hz, and compatibility with minimal external capacitance for input transient suppression.
Technical Context
The ZSR520GTA employs an internally compensated bandgap reference and series pass transistor architecture, enabling stability without external capacitors. Its thermal shutdown activates above junction temperature limits, and internal short-circuit current limiting protects against sustained overloads.
It requires a minimum input voltage of 7.2 V to maintain regulation at full 200 mA load, with typical dropout voltage of ~1.9 V at 100 mA and rising to ~2.2 V at 200 mA across temperature. Line regulation is specified at 10–40 mV over Vin = 7.2–20 V, and load regulation is 5–25 mV over IO = 1–200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.2 V nominal; 4.99–5.41 V over temperature and load ensures reliable logic-level supply for 5 V microcontrollers. |
| Output Current | 200 mA maximum; supports moderate-power analog sensors or small FPGA I/O banks without external boost. |
| Quiescent Current | 350–600 µA; enables low-standby-power operation in battery-backed systems. |
| Ripple Rejection | 48–62 dB at 120 Hz; suppresses switching noise from upstream DC/DC converters feeding the regulator input. |
| Operating Temperature | –55°C to +125°C; qualified for under-hood automotive and industrial motor drive environments. |
| Input Voltage Range | 7.2 V to 20 V; accommodates wide-input 12 V rail variations while maintaining regulation margin. |
| Thermal Shutdown | Active above safe junction limit; prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
Package: SOT223 - high-power surface-mount package with exposed thermal pad (pin 4), rated for 2 W dissipation at 25°C ambient on 2-inch² PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage terminal | Accepts unregulated DC input; must be decoupled with ≥1 µF capacitor to prevent overshoot during thermal shutdown. |
| 2 (GND) | Ground reference | Common return path for load current and internal bias; connects to PCB ground plane for thermal conduction. |
| 3 (OUT) | Regulated output | Delivers stable 5.2 V; no external compensation required due to internal frequency compensation. |
| 4 (GND) | Thermal pad / secondary ground | Electrically identical to pin 2; soldered to large copper area to enhance thermal dissipation and reduce θJA. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Internally compensated design eliminates need for output capacitor ESR tuning or feedforward capacitors. |
| Tight initial output tolerance | ±2.5% (5.07–5.33 V) reduces need for post-regulation trimming in cost-sensitive applications. |
| Low quiescent current drift | Ig change ≤100 µA over IO = 1–200 mA and Vin = 7.2–20 V, preserving efficiency across load range. |
| Robust fault protection | Integrated thermal shutdown and short-circuit current limit prevent latch-up or catastrophic failure. |
| Wide operating temperature range | Specified performance from –55°C to +125°C supports deployment in harsh environmental enclosures. |
Applications
| Industrial Sensor Node | Programmable Logic Controller (PLC) I/O Module |
|---|---|
|
Use Scenario: Local 5.2 V supply for analog front-end and ADC in distributed temperature/humidity sensor nodes mounted near motors or transformers. IC Role / Device Role / Timing Role: Fixed-output linear regulator providing clean, low-noise bias for precision signal conditioning circuitry. Use Value: Maintains <±0.5% output variation over –40°C to +85°C ambient and rejects >48 dB of 120 Hz ripple from shared 12 V bus. |
Use Scenario: Dedicated 5.2 V rail for digital isolator power and microcontroller I/O bank in modular PLC backplane slots. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring stable voltage during fast-switching digital load transients. Use Value: Delivers 200 mA with <25 mV load regulation and survives repeated short-circuit events via internal current limiting. |
| Embedded Motor Drive Control Board | Legacy Industrial Communication Interface |
|
Use Scenario: Powering gate driver bias and op-amp comparators in compact BLDC motor control boards with limited board area. IC Role / Device Role / Timing Role: Compact, thermally robust regulator replacing larger TO-220 parts in high-density layouts. Use Value: SOT223 footprint enables direct replacement of obsolete TO-92 variants while doubling power handling capability. |
Use Scenario: Supplying isolated RS-485 transceiver and level-shifting logic in legacy factory-floor communication nodes. IC Role / Device Role / Timing Role: Stable local regulator tolerant of long cable-induced input transients and EMI. Use Value: Withstands 20 V absolute max input and maintains regulation down to 7.2 V input-compatible with aging 12 V supplies with sag. |
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 |
|---|---|---|---|
| LM78L05ACZ | 5.0 V output, ±5% tolerance, 100 mA max, TO-92 package, higher quiescent current (~5.5 mA) | Limited to lower-current logic rails; lacks thermal shutdown robustness and SOT223 thermal performance | Select only if legacy TO-92 footprint is mandatory and load current remains ≤100 mA. |
| MCP1700T-5202E/MB | 5.2 V output, ±1% tolerance, 250 mA max, SOT23-5, ultra-low quiescent current (1.6 µA) | Optimized for battery-powered standby; lacks short-circuit current limit and thermal shutdown redundancy | Prefer for energy-harvesting or always-on low-power nodes-but not for industrial overload-prone environments. |
Compared with LM78L05ACZ, ZSR520GTA offers tighter tolerance, double output current, and superior thermal resilience; compared with MCP1700T-5202E/MB, it trades ultra-low Ig for proven fault protection and higher continuous power delivery in demanding settings.
Availability
ZSR520GTA is available at Aetrix Electronics and suitable for industrial sensor nodes, programmable logic controller (PLC) I/O modules, and embedded motor drive control boards requiring stable component supply despite its obsolete status and limited remaining stock.
Supply support for ZSR520GTA 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 manufacturer specializing in high-reliability analog and power semiconductors before acquisition by Diodes Incorporated in 2008.
The ZSR Series was developed for space-constrained industrial and automotive local regulation, emphasizing ruggedness, no-external-component simplicity, and extended temperature operation without derating.
FAQ
Is ZSR520GTA still in production?
No-ZSR520GTA is marked "Obsolete" in the official Zetex documentation. It is no longer manufactured, but limited legacy stock may be available through authorized distributors with full traceability. Aetrix Electronics sources verified remainder stock with full lot traceability and electrical test verification per original Zetex specifications.
Can ZSR520GTA be used without an input capacitor?
A minimum 1 µF input capacitor is strongly advised. The datasheet explicitly warns that inductive input sources can generate destructive transients during thermal shutdown activation; the capacitor clamps these spikes and ensures the 20 V absolute maximum rating is not exceeded.
What is the thermal resistance (θJA) of ZSR520GTA in SOT223?
Zetex specifies 2 W maximum power dissipation at Tamb = 25°C for the SOT223 package on a 2-inch² PCB. This implies θJA ≈ 62.5°C/W (calculated as 125°C − 25°C ÷ 2 W), with linear derating to zero at 125°C ambient. No explicit θJA value is published, but this inferred value aligns with standard SOT223 thermal performance under the stated test conditions.
Does ZSR520GTA require output capacitance for stability?
No-ZSR520GTA is internally compensated and fully stable with zero output capacitance. The datasheet confirms "completely stable with no external components," and all electrical characteristics are measured without output capacitors. Adding output capacitance may improve transient response but is not required for loop stability.
ZSR520GTA 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):
- 5.2V
- 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
ZSR520GTA FAQ
1.How can I place an order for ZSR520GTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSR520GTA 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 ZSR520GTA reliable?
The price and inventory of ZSR520GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR520GTA is usually 5 days.
3.What payment methods are accepted for ZSR520GTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR520GTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSR520GTA?
ZSR520GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSR520GTA 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 ZSR520GTA?
For technical support, including ZSR520GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR520GTA requirements.
6.How does Aetrix verify that ZSR520GTA is sourced from the original manufacturer or authorized distributors?
All ZSR520GTA 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 ZSR520GTA meets industry standards.
7.What is the process for return or replacement of ZSR520GTA?
All ZSR520GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZSR520GTA, 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 ZSR520GTA part is unused and in its original packaging.
Return procedure for ZSR520GTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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