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Diodes Incorporated AS78L15RTR-G1
- Part No.:
- AS78L15RTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AS78L15RTR-G1.pdf
- Description:
- IC REG LINEAR 15V 100MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:394
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Product details
Overview
AS78L15RTR-G1 from Diodes Incorporated is a fixed-output +15 V, 100 mA positive voltage regulator in SOT-89 package, featuring internal current limiting, thermal shutdown, and safe-area protection for local on-card regulation. It delivers stable output with ±5% accuracy over −40 °C to +125 °C, supports input voltages up to 36 V, and requires no external components.
For engineers reviewing the AS78L15RTR-G1 datasheet, AS78L15RTR-G1 pinout, AS78L15RTR-G1 application, or AS78L15RTR-G1 equivalent, key selection criteria include dropout voltage (1.7 V at 40 mA), PSRR (34–39 dB at 120 Hz), output noise (90 µV RMS), thermal resistance (28.3 °C/W), and compatibility with low-ESR ceramic capacitors.
Technical Context
This linear regulator uses a PNP pass transistor architecture with built-in foldback current limiting and thermal shutdown triggered at 150 °C junction temperature. Its safe-area compensation ensures robustness under sustained overload without external protection circuitry.
Designed for fixed-voltage operation only, it lacks adjustment pins or enable control - output is always active when input voltage exceeds dropout plus 15 V. The SOT-89 package provides enhanced thermal performance versus TO-92 while maintaining 3-pin simplicity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +15.0 V nominal, ±5% tolerance over full temperature and load range - ensures compatibility with 15 V logic and analog rails. |
| Max Output Current | 100 mA continuous - sufficient for microcontroller cores, op-amp biasing, and sensor signal conditioning stages. |
| Dropout Voltage | 1.7 V at 40 mA load - enables operation from 16.7 V minimum input, supporting wide-input industrial supplies. |
| PSRR | 34–39 dB at 120 Hz - suppresses ripple from rectified AC or switching supply residuals feeding into sensitive analog circuits. |
| Output Noise | 90 µV RMS (10 Hz–100 kHz) - low enough for precision ADC references and low-noise amplifier biasing. |
| Thermal Resistance θJA | 28.3 °C/W (SOT-89) - allows 100 mA operation up to +105 °C ambient with minimal heatsinking. |
| Quiescent Current | 3–6 mA - enables predictable standby power budgeting in always-on subsystems. |
Pinout & Package
AS78L15RTR-G1 is housed in a 3-pin SOT-89 surface-mount package with exposed thermal pad (pin 2 connected to GND). Pin assignments are standardized across AS78LXX variants in this package option.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated DC input | Accepts 17.5–30 V input; must be decoupled with ≥0.33 µF capacitor near pin. |
| 2 (GND) | Ground reference and thermal path | Internal substrate connection; PCB copper pour required for thermal dissipation. |
| 3 (OUTPUT) | Regulated +15 V output | Stable 15 V rail; requires ≥0.1 µF ceramic output capacitor for stability and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated pass element, error amplifier, and feedback network eliminate need for resistors or capacitors beyond input/output bypassing. |
| Internal short-circuit protection | Foldback current limiting reduces output current during overload, preventing thermal runaway without external fusing. |
| Thermal shutdown | Automatic disable above 150 °C junction temperature, with automatic recovery after cooldown - protects against board-level overheating events. |
| Safe-area compensation | Dynamic adjustment of SOA limits during transient overloads preserves reliability under pulse-current conditions typical in digital load switching. |
| ±5% output accuracy | Guaranteed over −40 °C to +125 °C and 1–100 mA load - eliminates need for post-regulation trimming in cost-sensitive consumer and industrial designs. |
Applications
| Microprocessor Core Supply | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Powering 15 V-tolerant MCU I/O banks or legacy peripheral interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering clean, stable 15 V rail independent of main system supply variations. Use Value: Eliminates need for discrete Zener+transistor regulators; maintains <±5% output under 100 mA dynamic load steps common in I/O toggling. |
Use Scenario: Biasing precision op-amps and analog front-ends in pressure/temperature transmitters operating in harsh environments. IC Role / Device Role / Timing Role: Low-noise, thermally robust voltage source enabling <90 µV RMS noise floor and operation up to +105 °C ambient. Use Value: Replaces higher-cost LDOs while meeting EN 61000-4-2 ESD immunity (2 kV HBM) and thermal shutdown requirements for field-deployed sensors. |
| Consumer Audio DAC Reference | Automotive Body Control Module Sub-Rail |
|
Use Scenario: Providing dedicated 15 V reference for high-resolution audio DACs in home theater receivers and streaming amplifiers. IC Role / Device Role / Timing Role: Ultra-low-noise analog supply isolated from noisy digital domains via physical layout separation and PSRR filtering. Use Value: Achieves 90 µV RMS noise and 34–39 dB PSRR at 120 Hz - directly improves DAC SNR by >1 dB compared to generic 78xx alternatives. |
Use Scenario: Generating auxiliary 15 V rail for LIN transceivers, LED drivers, and relay coils in non-safety-critical automotive body electronics. IC Role / Device Role / Timing Role: Robust local regulator surviving load-dump transients up to 36 V input and operating across −40 °C to +125 °C under hood conditions. Use Value: Withstands 36 V absolute max input and 150 °C thermal shutdown - meets AEC-Q100 stress test margins without derating. |
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 |
|---|---|---|---|
| LM78L15ACZ-TR | TO-92 package, higher θJA (180 °C/W), ±4% initial accuracy but wider temp drift (1.25 mV/°C vs. 1.25 mV/°C). | Limited to ≤30 mA at +85 °C ambient due to thermal constraints; unsuitable for compact SMT layouts. | Select if through-hole assembly is required and thermal load is light; avoid for SMT density-critical designs. |
| TL78L15ACDR | SOIC-8 package, same 15 V output, but higher quiescent current (6.5 mA typ) and lower PSRR (30 dB). | Requires larger PCB area and delivers higher noise floor - less suitable for audio or precision analog use cases. | Choose only if SOIC-8 footprint is mandated and noise/PSRR are secondary to package compatibility. |
Compared with LM78L15ACZ-TR and TL78L15ACDR, AS78L15RTR-G1 offers superior thermal performance in SOT-89, lower noise, and tighter line/load regulation - making it optimal for space-constrained, thermally demanding, or noise-sensitive 15 V regulation tasks.
Availability
AS78L15RTR-G1 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, consumer audio subsystems, and microprocessor I/O power requiring stable component supply with RoHS-compliant green packaging.
Supply support for AS78L15RTR-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 automotive markets.
The AS78LXX series was developed as a drop-in replacement for legacy 78Lxx regulators, emphasizing thermal robustness, simplified design, and extended temperature operation - targeting cost-sensitive, high-volume embedded systems.
FAQ
What is the minimum input voltage required for AS78L15RTR-G1 to maintain regulation?
The minimum input voltage is 16.7 V - calculated as nominal output (15 V) plus worst-case dropout (1.7 V at 40 mA). At 100 mA load, dropout rises to 1.8 V, requiring ≥16.8 V input. Operation below these thresholds results in unregulated output tracking input minus dropout.
Can AS78L15RTR-G1 be used with ceramic output capacitors?
Yes - the datasheet specifies a minimum 0.01 µF ceramic capacitor for high-frequency noise suppression, and recommends ≥0.1 µF for general stability. Unlike older 78xx regulators, it does not require ESR damping and remains stable with low-ESR ceramics commonly used in modern PCB designs.
Does AS78L15RTR-G1 include reverse-polarity protection?
No - the device lacks internal reverse-voltage protection. Applying reversed input voltage may cause permanent damage. External protection, such as a series Schottky diode or parallel TVS, is required in applications where polarity reversal is possible during service or assembly.
How does thermal shutdown behave during sustained overload?
When junction temperature reaches ~150 °C, the regulator disables output and holds it off until temperature drops ~20 °C below trip point. This hysteresis prevents rapid cycling. Recovery is automatic and requires no external reset - critical for unattended industrial equipment operation.
AS78L15RTR-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):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.8V @ 100mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 39dB (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
AS78L15RTR-G1 FAQ
1.How can I place an order for AS78L15RTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS78L15RTR-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 AS78L15RTR-G1 reliable?
The price and inventory of AS78L15RTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS78L15RTR-G1 is usually 5 days.
3.What payment methods are accepted for AS78L15RTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS78L15RTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS78L15RTR-G1?
AS78L15RTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS78L15RTR-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 AS78L15RTR-G1?
For technical support, including AS78L15RTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS78L15RTR-G1 requirements.
6.How does Aetrix verify that AS78L15RTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS78L15RTR-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 AS78L15RTR-G1 meets industry standards.
7.What is the process for return or replacement of AS78L15RTR-G1?
All AS78L15RTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS78L15RTR-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 AS78L15RTR-G1 part is unused and in its original packaging.
Return procedure for AS78L15RTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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