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Diodes Incorporated AS78L12RTR-G1
- Part No.:
- AS78L12RTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AS78L12RTR-G1.pdf
- Description:
- IC REG LINEAR 12V 100MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:23,944
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Product details
Overview
AS78L12RTR-G1 from Diodes Incorporated is a fixed-output +12 V, 100 mA positive voltage regulator in SOT-89 package with internal current limiting, thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies and motherboard rails, maintaining ±5% output accuracy across –40 °C to +125 °C with dropout voltage of 1.7 V at 40 mA load.
For engineers reviewing the AS78L12RTR-G1 datasheet, AS78L12RTR-G1 pinout, AS78L12RTR-G1 application, or AS78L12RTR-G1 equivalent, key selection criteria include input voltage range (up to 36 V), quiescent current (≤6 mA), PSRR (37–42 dB at 120 Hz), noise performance (80 µV RMS), and thermal resistance (28.3 °C/W junction-to-case).
Technical Context
This linear regulator uses a monolithic bipolar process with built-in short-circuit and thermal overload protection. Its architecture integrates a pass transistor with safe-area compensation, eliminating external components while ensuring robustness under sustained overload conditions.
It operates without external capacitors beyond recommended 0.33 µF input and 0.1 µF output bypassing. The device maintains regulation over full industrial temperature range with line regulation ≤250 mV and load regulation ≤100 mV - critical for low-noise analog and digital subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12.0 V nominal, ±5% tolerance (11.4–12.6 V) ensures compatibility with 12 V logic and analog rails. |
| Max Output Current | 100 mA continuous - sufficient for powering microcontroller cores, sensors, and interface ICs on local PCB sections. |
| Input Voltage Range | 14.5 V to 27 V (recommended); absolute max 36 V - supports wide-input industrial and automotive-derived supplies. |
| Dropout Voltage | 1.7 V at 40 mA load - enables operation from 13.7 V minimum input, reducing heat dissipation vs. higher-dropout regulators. |
| PSRR | 37–42 dB at 120 Hz - suppresses ripple from switching pre-regulators or noisy DC/DC outputs feeding this LDO. |
| Output Noise | 80 µV RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuitry like ADC references or op-amp biasing. |
| Thermal Resistance θJC | 28.3 °C/W - allows up to 750 mW power dissipation with proper heatsinking on SOT-89 copper pad. |
Pinout & Package
SOT-89 package: 3-pin surface-mount plastic package with exposed thermal pad (pin 2 is GND, electrically connected to tab). Standard footprint per Diodes Inc. suggested layout (X = 0.55 mm, E = 1.50 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated input supply connection | Accepts 14.5–27 V input; requires ≥0.33 µF ceramic bypass capacitor close to pin. |
| 2 (GND) | Ground reference and thermal path | Common return for input/output; soldered thermal pad provides primary heat conduction to PCB copper. |
| 3 (OUTPUT) | Regulated +12 V output | Delivers stable 12 V to load; requires ≥0.1 µF ceramic output capacitor for stability and noise filtering. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated pass element, feedback network, and protection circuitry eliminate need for external resistors or capacitors beyond bypassing. |
| Internal thermal shutdown | Activates at ~150 °C junction temperature, latching off until cooldown - prevents permanent damage during sustained overload. |
| Safe-area compensated output transistor | Prevents second breakdown during transient overloads by dynamically limiting SOA stress - enhances reliability in unregulated input environments. |
| ±5% output accuracy over temperature | Guaranteed 11.4–12.6 V output across –40 °C to +125 °C - eliminates need for post-regulation trimming in most embedded applications. |
Applications
| Microprocessor Core Supply | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Powering 3.3 V or 5 V microcontroller I/O banks or peripheral interfaces requiring clean 12 V bias. IC Role / Device Role / Timing Role: Local point-of-load regulator providing stable 12 V rail independent of main system supply variations. Use Value: Maintains signal integrity and timing margin for SPI/I²C peripherals by suppressing input ripple and load-induced transients. |
Use Scenario: Supplying 12 V excitation to precision RTD or strain gauge bridges in factory automation modules. IC Role / Device Role / Timing Role: Low-noise analog supply source with <80 µV RMS noise and <100 mV load regulation. Use Value: Enables 16-bit ADC resolution by minimizing supply-induced offset drift and quantization error. |
| Motherboard Standby Rail | Consumer Audio Bias Supply |
|
Use Scenario: Generating always-on 12 V standby voltage for real-time clock, wake-on-LAN, or USB suspend/resume circuitry. IC Role / Device Role / Timing Role: Low-quiescent-current (≤6 mA) regulator sustaining minimal load during system sleep states. Use Value: Reduces standby power consumption while preserving fast wake-up response via stable, low-drift output. |
Use Scenario: Providing 12 V bias to Class AB audio amplifier stages in smart speakers and soundbars. IC Role / Device Role / Timing Role: Clean, thermally robust local supply decoupled from noisy SMPS sources. Use Value: Suppresses audible hum and improves THD+N by delivering ripple-free voltage with 42 dB PSRR at 120 Hz. |
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 |
|---|---|---|---|
| LM78L12ACZ-TR | Same 12 V output, but TO-92 package only; higher θJA (180 °C/W) limits power handling; ±4% initial accuracy. | Limited to lower-power, through-hole designs; lacks SOT-89 thermal performance for compact PCBs. | Choose when legacy TO-92 footprint or cost sensitivity outweighs thermal and space requirements. |
| AP7361-12WG-7 | 12 V output, 150 mA rating, but CMOS-based; quiescent current 5 µA vs. 6 mA; no thermal shutdown. | Better for ultra-low-power battery systems; unsuitable for high-ambient or overload-prone environments. | Prefer for energy-harvesting or coin-cell applications where shutdown behavior is not required. |
Compared with LM78L12ACZ-TR and AP7361-12WG-7, AS78L12RTR-G1 uniquely balances SOT-89 thermal efficiency, integrated protection, and industrial temperature support - making it optimal for space-constrained, reliability-critical embedded power rails.
Availability
AS78L12RTR-G1 is available at Aetrix Electronics and suitable for microprocessor power supply, industrial sensor interface, motherboard standby rail, and consumer audio bias supply applications requiring stable component supply and long-term lifecycle continuity.
Supply support for AS78L12RTR-G1 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AS78LXX series targets cost-sensitive, space-constrained local regulation needs - delivering robust three-terminal linear regulation with integrated safety features for embedded control and interface subsystems.
FAQ
What is the minimum input voltage required for AS78L12RTR-G1 to maintain regulation?
The recommended minimum input voltage is 14.5 V, based on its 1.7 V dropout at 40 mA load and 12 V nominal output. At 100 mA, dropout rises to 1.8 V, requiring ≥13.8 V input. Operation below 14.5 V may cause marginal regulation under full load or elevated temperature.
Does AS78L12RTR-G1 require an output capacitor, and what value is recommended?
Yes - a minimum 0.1 µF ceramic capacitor is required at the output for stability and noise suppression, per Diodes' datasheet. Larger values (e.g., 1–10 µF) improve transient response and further reduce output noise, especially under dynamic load conditions.
Can AS78L12RTR-G1 be used in parallel to increase output current?
No - the AS78L12RTR-G1 is not designed for parallel operation. Its internal feedback and thermal protection are optimized for single-device use. Paralleling risks current imbalance, thermal runaway, and premature shutdown due to mismatched dropout voltages and thermal gradients.
Is AS78L12RTR-G1 RoHS compliant and halogen-free?
Yes - the "G1" suffix denotes Diodes Incorporated's green, halogen-free, RoHS-compliant packaging. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is rated for reflow soldering up to 260 °C peak temperature (10 seconds).
AS78L12RTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.8V @ 100mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 42dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AS78L12RTR-G1 FAQ
1.How can I place an order for AS78L12RTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS78L12RTR-G1 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 AS78L12RTR-G1 reliable?
The price and inventory of AS78L12RTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS78L12RTR-G1 is usually 5 days.
3.What payment methods are accepted for AS78L12RTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS78L12RTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS78L12RTR-G1?
AS78L12RTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS78L12RTR-G1 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 AS78L12RTR-G1?
For technical support, including AS78L12RTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS78L12RTR-G1 requirements.
6.How does Aetrix verify that AS78L12RTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS78L12RTR-G1 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 AS78L12RTR-G1 meets industry standards.
7.What is the process for return or replacement of AS78L12RTR-G1?
All AS78L12RTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS78L12RTR-G1, 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 AS78L12RTR-G1 part is unused and in its original packaging.
Return procedure for AS78L12RTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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