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Diodes Incorporated AS78L15RTR-E1
- Part No.:
- AS78L15RTR-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AS78L15RTR-E1.pdf
- Description:
- IC REG LINEAR 15V 100MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:3,810
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Product details
Overview
AS78L15RTR-E1 from Diodes Incorporated is a fixed-output +15 V, 100 mA positive linear voltage regulator in SOT-89 package with internal current limiting, thermal shutdown, and safe-area protection. It delivers stable local regulation for low-power microprocessor supplies and embedded logic rails, maintaining ±5% output accuracy over –40 °C to +125 °C with dropout voltage of 1.7 V at 40 mA.
For engineers reviewing the AS78L15RTR-E1 datasheet, AS78L15RTR-E1 pinout, AS78L15RTR-E1 application, or AS78L15RTR-E1 equivalent, key selection criteria include input voltage range (up to 30 V), quiescent current (≤6 mA), PSRR (34–39 dB at 120 Hz), noise performance (90 µV RMS), and thermal resistance (28.3 °C/W junction-to-case).
Technical Context
The AS78L15RTR-E1 implements a monolithic series-pass regulator architecture with built-in short-circuit current limiting and thermal overload protection. Its safe-area compensation ensures reliable operation under transient overloads without external foldback circuitry.
It operates across an input voltage range of 17.5 V to 30 V and maintains regulated output across load currents from 1 mA to 100 mA. The device requires no external components for basic operation and supports stable regulation with only 0.1 µF output capacitance.
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 subsystems. |
| Max Output Current | 100 mA continuous - sufficient for powering small microcontrollers, sensors, or interface ICs without heatsinking. |
| Dropout Voltage | 1.7 V at 40 mA, 1.8 V at 100 mA - enables operation from 17.5 V minimum input while retaining regulation margin. |
| Line Regulation | 25–250 mV over 17.5–30 V input - limits output variation due to supply rail fluctuations in unregulated DC inputs. |
| Load Regulation | 25–150 mV over 1–100 mA load - maintains voltage stability across dynamic current demands in digital logic rails. |
| PSRR | 34–39 dB at 120 Hz - suppresses ripple from rectified AC or switching supply sources feeding the regulator input. |
| Output Noise | 90 µV RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like ADC references or op-amp biasing. |
| Quiescent Current | 3–6 mA - enables low standby power consumption in always-on embedded monitoring systems. |
Pinout & Package
AS78L15RTR-E1 is housed in a surface-mount SOT-89 package with three terminals. Thermal performance is optimized via the exposed collector pad (Pin 2), which serves as both GND and thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated DC input (17.5–30 V); connects to upstream supply or filter capacitor. |
| 2 | GND | Ground reference and primary thermal conduction path; must be soldered to large PCB copper area. |
| 3 | OUTPUT | Stable +15 V output; decoupled with ≥0.1 µF ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables minimal BOM count and board space usage - only input/output capacitors needed for stability. |
| Internal thermal shutdown | Protects against sustained overload or poor PCB thermal design without external sensing circuitry. |
| Safe-area compensated pass transistor | Prevents second breakdown during transient overloads - eliminates need for external current foldback. |
| ±5% output voltage accuracy | Guarantees compliance with 15 V TTL/CMOS and legacy analog subsystem tolerances across industrial temperature range. |
| Lead-free and RoHS-compliant (E1 suffix) | Meets global environmental compliance requirements for industrial and consumer manufacturing. |
Applications
| Industrial Sensor Interface | Microcontroller Power Rail |
|---|---|
|
Use Scenario: Powering analog front-end circuitry for 4–20 mA transmitters and RTD signal conditioners in factory automation nodes. IC Role / Device Role / Timing Role: Local +15 V regulator supplying precision op-amps and ADC reference buffers. Use Value: Low 90 µV noise and ±5% accuracy preserve measurement integrity; thermal shutdown prevents field failure during sensor cable fault events. |
Use Scenario: Providing clean 15 V supply to legacy 8-bit microcontrollers (e.g., PIC16F, 8051 variants) in programmable logic controllers. IC Role / Device Role / Timing Role: Primary VDD source for MCU core and peripheral I/O banks requiring stable rail under variable load. Use Value: 100 mA capacity supports full I/O drive; 1.7 V dropout allows use with 18 V nominal industrial supplies. |
| Legacy Analog Instrumentation | Embedded Display Backlight Bias |
|
Use Scenario: Generating bias voltage for op-amp-based signal generators and function generator output stages. IC Role / Device Role / Timing Role: Fixed +15 V rail for dual-supply op-amp rails and DAC output amplifiers. Use Value: 34–39 dB PSRR attenuates switching noise from shared DC/DC converters; SOIC-8-compatible footprint allows drop-in replacement in existing designs. |
Use Scenario: Supplying constant-current LED driver ICs (e.g., TLC591x) in HMI panels with segmented LCD backlights. IC Role / Device Role / Timing Role: Stable 15 V bias for high-side LED driver FET gates and current-sense resistors. Use Value: Internal current limiting protects against LED string open-circuit faults; GND-pin thermal path sustains reliability under continuous backlight operation. |
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 | Same 15 V output, but ±4% initial accuracy and higher quiescent current (5.5–8.5 mA); TO-92 package only. | Limited to lower-power, through-hole designs; lacks SOT-89 thermal performance. | Select when legacy TO-92 footprint is mandatory and tighter initial accuracy is required. |
| TL78L15ACDR | 15 V output with ±5% tolerance, but lower max current (100 mA same), higher dropout (2.0 V), and no safe-area compensation. | Suitable for cost-sensitive consumer designs where thermal robustness is secondary. | Choose for lower-cost alternatives where thermal overload risk is mitigated by system-level derating. |
Compared with LM78L15ACZ-TR and TL78L15ACDR, AS78L15RTR-E1 offers superior thermal resistance (28.3 °C/W vs. >180 °C/W), integrated safe-area protection, and SOT-89 surface-mount compatibility - making it optimal for space-constrained, thermally demanding industrial PCBs.
Availability
AS78L15RTR-E1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power rails, legacy analog instrumentation, and embedded display backlight biasing requiring stable component supply and long-term manufacturability.
Supply support for AS78L15RTR-E1 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 and automotive markets.
The AS78LXX series was designed specifically for local, on-card regulation in space- and cost-constrained embedded systems - delivering robust linear regulation without external components across consumer, industrial, and computing applications.
FAQ
What is the minimum input voltage required for AS78L15RTR-E1 to maintain regulation?
The AS78L15RTR-E1 requires a minimum input voltage of 17.5 V to sustain 15 V output under full 100 mA load, based on its 1.8 V dropout specification. At lighter loads (e.g., 40 mA), regulation holds down to 16.7 V input. Operation below 17.5 V risks output collapse during peak current demand.
Can AS78L15RTR-E1 replace older 78L15 regulators in existing designs?
Yes - AS78L15RTR-E1 is pin-compatible with standard 78L15 SOT-89 variants (e.g., LM78L15ACZ-TR in SOT-89 form factor) and matches the same INPUT-GND-OUTPUT pinout. Its improved thermal resistance (28.3 °C/W) and safe-area protection provide enhanced reliability over legacy parts without layout changes.
Is an input capacitor required for stable operation?
A 0.33 µF ceramic input capacitor is recommended per the datasheet to suppress high-frequency noise and prevent oscillation during line transients. While the regulator may function without it under ideal lab conditions, omitting this capacitor risks instability in real-world PCB layouts with trace inductance.
Does AS78L15RTR-E1 support reverse-polarity input protection?
No - AS78L15RTR-E1 lacks internal reverse-voltage protection. Applying negative voltage to the INPUT pin relative to GND can damage the device. External protection (e.g., series diode or TVS) is required in systems where input polarity reversal is possible, such as battery-powered or field-serviceable equipment.
AS78L15RTR-E1 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-E1 FAQ
1.How can I place an order for AS78L15RTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS78L15RTR-E1 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-E1 reliable?
The price and inventory of AS78L15RTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS78L15RTR-E1 is usually 5 days.
3.What payment methods are accepted for AS78L15RTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS78L15RTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS78L15RTR-E1?
AS78L15RTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS78L15RTR-E1 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-E1?
For technical support, including AS78L15RTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS78L15RTR-E1 requirements.
6.How does Aetrix verify that AS78L15RTR-E1 is sourced from the original manufacturer or authorized distributors?
All AS78L15RTR-E1 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-E1 meets industry standards.
7.What is the process for return or replacement of AS78L15RTR-E1?
All AS78L15RTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS78L15RTR-E1, 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-E1 part is unused and in its original packaging.
Return procedure for AS78L15RTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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