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STMicroelectronics L78L15ACD13TR
- Part No.:
- L78L15ACD13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L78L15ACD13TR.pdf
- Description:
- IC REG LINEAR 15V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:13,309
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Product details
Overview
L78L15ACD13TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 15 V output at up to 100 mA, featuring ±4% output voltage tolerance (A grade), thermal overload protection, and short-circuit current limiting. It requires no external components and is used for local on-card regulation in industrial control modules, sensor signal conditioning circuits, and low-power microcontroller power rails.
For engineers reviewing the L78L15ACD13TR datasheet, L78L15ACD13TR pinout, L78L15ACD13TR application, or L78L15ACD13TR equivalent, this device is selected for stable low-current fixed-voltage regulation where dropout voltage ≤1.7 V, quiescent current ≤6.5 mA at 25 °C, and supply voltage rejection ≥34 dB (120 Hz) are critical design constraints.
Technical Context
The L78L15ACD13TR implements an internally compensated NPN pass transistor architecture with built-in current limiting and thermal shutdown circuitry. Its regulation loop maintains output stability across input voltages from 17.5 V to 30 V and load currents from 1 mA to 100 mA.
It operates over a junction temperature range of 0 to 125 °C and achieves 75 mV load regulation (1–40 mA) and 250 mV line regulation (20–30 V), with 90 µV RMS output noise (10 Hz–100 kHz) and 1.7 V dropout voltage at rated load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 15 V ±4% (±0.6 V) at 25 °C - ensures compatibility with 15 V logic and analog subsystems requiring tight DC accuracy |
| Max Output Current | 100 mA - supports power delivery to multiple low-power ICs (e.g., op-amps, comparators, MCU peripherals) on a single rail |
| Dropout Voltage | 1.7 V at 40 mA - enables operation from 16.7 V minimum input, reducing heat dissipation vs. higher-dropout regulators |
| Quiescent Current | 6.5 mA at 25 °C - minimizes standby power loss in battery-backed or energy-sensitive applications |
| Supply Rejection | 34–39 dB at 120 Hz - suppresses ripple from unregulated AC/DC supplies feeding downstream analog circuitry |
| Output Noise | 90 µV RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog front-ends such as precision ADC references or sensor amplifiers |
| Thermal Shutdown | Active at TJ ≥150 °C - protects against sustained overload or inadequate PCB copper heatsinking |
Pinout & Package
Supplied in SO-8 package with internal die attach flag connected to pins 2, 3, 6, and 7 for enhanced thermal performance. Requires ≥6 cm² copper pour on PCB for optimal RthJA = 55 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage terminal | Accepts 17.5–30 V DC; must be decoupled with ≥0.33 µF ceramic capacitor close to pin |
| Pin 2 (GND) | Ground reference | Common return path for input and output capacitors; electrically tied to die flag for thermal conduction |
| Pin 3 (OUT) | Regulated output | Delivers 15 V ±4%; requires ≥0.1 µF ceramic capacitor at output for stability |
| Pins 4, 5, 8 | No-connect / thermal pad | Internally floating; may be left unconnected or grounded for mechanical stability only |
| Pins 2, 3, 6, 7 | Die attach flag connection | Electrically common; forms primary thermal path to PCB copper heatsink |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Internal compensation eliminates need for external capacitors beyond mandatory input/output bypassing |
| Short-circuit protected | Current-limited output prevents damage during accidental output-to-ground faults |
| Thermal overload protection | Automatic shutdown at junction temperature ≥150 °C; auto-recovery after cooldown |
| Low quiescent current | 6.5 mA typical at 25 °C - reduces system-level idle power by >30% vs. legacy 78LxxC variants |
| Fixed output with tight tolerance | ±4% (A grade) ensures reliable operation without post-regulation trimming in cost-sensitive designs |
Applications
| Industrial Sensor Node Power | PLC I/O Module Local Regulation |
|---|---|
Use Scenario: Powering analog sensor signal chains (e.g., 4–20 mA transmitters, RTD interfaces) in DIN-rail mounted field devices. IC Role / Device Role / Timing Role: Fixed 15 V local regulator supplying op-amps, ADC drivers, and reference buffers. Use Value: 90 µV output noise and 34 dB SVR prevent measurement drift caused by switching supply coupling or line harmonics. |
Use Scenario: Providing isolated 15 V rail for digital isolator biasing and optocoupler LED drive in modular PLC backplanes. IC Role / Device Role / Timing Role: On-card voltage source ensuring clean, regulated supply independent of main 24 V bus ripple. Use Value: 1.7 V dropout allows direct derivation from 24 V bus with minimal derating, reducing need for intermediate buck stages. |
| Microcontroller Peripherals Supply | Legacy Equipment Voltage Replacement |
Use Scenario: Powering UART transceivers, CAN controllers, and SPI flash memory in embedded edge controllers. IC Role / Device Role / Timing Role: Dedicated low-noise 15 V rail for interface ICs requiring stable VCC independent of core MCU supply. Use Value: 100 mA output supports concurrent operation of 3–4 interface ICs while maintaining <±1% output deviation under dynamic load steps. |
Use Scenario: Direct replacement for obsolete 78L15AC in repair and obsolescence mitigation programs for test equipment and medical analyzers. IC Role / Device Role / Timing Role: Pin-compatible upgrade offering improved thermal resistance (RthJA = 55 °C/W vs. TO-92's 200 °C/W) and tighter tolerance. Use Value: SO-8 package enables automated assembly and superior thermal performance without board redesign. |
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 |
|---|---|---|---|
| LM78L15ACM/NOPB | TO-92 package, ±5% tolerance, RthJA = 200 °C/W, 100 mA max, 2 V dropout | Higher thermal resistance limits continuous 100 mA operation without heatsink; less suitable for compact PCB layouts | Select when legacy through-hole assembly or minimal BOM change is prioritized over thermal performance |
| MC78L15ACP | TO-92, ±5% tolerance, 60 mA max output, 1.7 V dropout, 8 mA quiescent current | Lower current rating and higher quiescent current reduce suitability for multi-load or low-power systems | Choose only for cost-sensitive, low-current (<60 mA) replacements where SO-8 footprint is unavailable |
Compared with LM78L15ACM/NOPB and MC78L15ACP, the L78L15ACD13TR provides superior thermal management via SO-8 die-flag construction, tighter ±4% output tolerance, and lower quiescent current-enabling higher reliability in space-constrained, thermally demanding industrial applications.
Availability
L78L15ACD13TR is available at Aetrix Electronics and suitable for industrial sensor nodes, PLC I/O modules, and microcontroller peripheral power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for L78L15ACD13TR 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
STMicroelectronics is a global semiconductor leader specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
The L78L series belongs to ST's legacy linear regulator product line, designed specifically for cost-effective, robust local regulation in space- and thermal-constrained embedded systems.
FAQ
What is the minimum input voltage required for stable 15 V output?
The L78L15ACD13TR requires a minimum input voltage of 16.7 V to maintain regulation at full 100 mA load, based on its 1.7 V dropout specification. At lighter loads (e.g., 40 mA), input can be as low as 16.7 V; for guaranteed operation across temperature and tolerance, 17.5 V is specified in datasheet test conditions.
Can this regulator be used in parallel to increase output current?
No-L78L15ACD13TR is not designed for parallel operation. Its internal current limiting and thermal protection are per-device; paralleling without external ballast resistors causes unequal current sharing and potential thermal runaway. For >100 mA, use a single higher-current regulator or external pass transistor configuration per Figure 14 in DS0424.
Is the SO-8 package lead-free and RoHS compliant?
Yes, the L78L15ACD13TR uses STMicroelectronics' ECOPACK2-compliant SO-8 package, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The "D13TR" suffix denotes tape-and-reel packaging with lead-free finish and halogen-free molding compound.
How does the thermal performance compare between SO-8 and TO-92 versions?
In SO-8 (L78L15ACD13TR), RthJA is 55 °C/W with 6 cm² PCB copper heatsink, versus 200 °C/W for TO-92. This allows continuous 100 mA operation at ambient temperatures up to 85 °C in SO-8, while TO-92 is limited to ~40 mA at same ambient-making SO-8 essential for high-density or thermally constrained designs.
L78L15ACD13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- 6.5 mA
- PSRR:
- 39dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
L78L15ACD13TR FAQ
1.How can I place an order for L78L15ACD13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L78L15ACD13TR 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 L78L15ACD13TR reliable?
The price and inventory of L78L15ACD13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78L15ACD13TR is usually 5 days.
3.What payment methods are accepted for L78L15ACD13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78L15ACD13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L78L15ACD13TR?
L78L15ACD13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L78L15ACD13TR 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 L78L15ACD13TR?
For technical support, including L78L15ACD13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78L15ACD13TR requirements.
6.How does Aetrix verify that L78L15ACD13TR is sourced from the original manufacturer or authorized distributors?
All L78L15ACD13TR 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 L78L15ACD13TR meets industry standards.
7.What is the process for return or replacement of L78L15ACD13TR?
All L78L15ACD13TR units undergo pre-shipment inspection (PSI). If there is an issue with L78L15ACD13TR, 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 L78L15ACD13TR part is unused and in its original packaging.
Return procedure for L78L15ACD13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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