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STMicroelectronics L78L08CD13TR
- Part No.:
- L78L08CD13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L78L08CD13TR.pdf
- Description:
- IC REG LINEAR 8V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:9,107
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Product details
Overview
L78L08CD13TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 8 V output at up to 100 mA, featuring internal current limiting, thermal shutdown, and short-circuit protection. It requires no external components, supports input voltages up to 35 V (for 8 V output), and exhibits ±4% output tolerance (C-grade), making it suitable for local on-card regulation in industrial control modules and low-power microcontroller power rails.
For engineers reviewing the L78L08CD13TR datasheet, L78L08CD13TR pinout, L78L08CD13TR application, or L78L08CD13TR equivalent, this device is evaluated for noise-sensitive analog supply domains, embedded system point-of-load regulation, and replacement of Zener/resistor networks where lower quiescent current (6 mA typ.) and improved line/load regulation (125 mV max line, 40 mV max load) are critical.
Technical Context
The L78L08CD13TR implements a monolithic silicon-based series pass regulator with built-in thermal overload and short-circuit protection circuitry. Its architecture relies on an internal bandgap reference, error amplifier, and Darlington pass transistor - enabling stable DC output without external compensation.
It operates across an input-to-output differential range of ≥1.7 V (dropout voltage) and maintains regulation over junction temperatures from 0 °C to 125 °C. The device's SO-8 package integrates pins 2, 3, 6, and 7 electrically to the die attach flag, reducing thermal resistance (RthJC = 20 °C/W) when mounted on copper heat-sink areas.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8 V nominal, ±4% tolerance (7.68–8.32 V at 25 °C); ensures compatibility with 8 V logic or analog subsystems requiring tight DC stability. |
| Max Output Current | 100 mA continuous; sufficient for powering MCU cores, sensors, or small peripherals without external pass transistors. |
| Dropout Voltage | 1.7 V typical at 40 mA; enables operation from 9.7 V minimum input, supporting wide-input legacy supplies. |
| Quiescent Current | 6 mA typical at 25 °C; minimizes standby power loss in battery-backed or energy-constrained designs. |
| Supply Voltage Rejection | 37–45 dB at 120 Hz; suppresses ripple from unregulated wall adapters or switching pre-regulators. |
| Output Noise | 60 µV RMS (10 Hz–100 kHz); low enough for precision ADC references or op-amp biasing without added filtering. |
| Thermal Shutdown Threshold | Internally set; activates before junction damage occurs, allowing safe recovery after fault removal. |
Pinout & Package
Package: SO-8 (small outline integrated circuit, 8-pin), with pins 2, 3, 6, and 7 internally connected to the die attach flag for enhanced thermal performance. Compatible with standard SO-8 footprints and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | VIN | Unregulated DC input; must exceed VO + 1.7 V and remain ≤35 V for safe operation. |
| Pin 2 (Ground) | GND | Common reference for input and output; tied to die flag for low-impedance thermal path. |
| Pin 3 (Output) | VOUT | Regulated 8 V output; decoupling capacitor (0.1 µF ceramic) required per datasheet layout guidelines. |
| Pins 4, 5, 7, 8 | No Connect / Flag Tie | Internally bonded to die flag; PCB copper pour under these pins improves thermal dissipation (RthJA = 55 °C/W with 6 cm² copper). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-output voltage regulation | Eliminates need for external feedback resistors or trimming, reducing BOM count and layout complexity. |
| Thermal overload protection | Automatic shutdown below safe junction temperature (125 °C), enabling robust operation in sealed enclosures. |
| Short-circuit current limiting | Clamps output current to safe levels during faults, preventing damage to upstream supply or PCB traces. |
| No external components required | Supports minimal footprint design: only input/output capacitors needed (0.33 µF and 0.1 µF). |
| Low output noise | 60 µV RMS enables direct use in signal-chain power domains without additional LDO post-regulation. |
Applications
| Industrial Sensor Interface | Microcontroller Core Supply |
|---|---|
|
Use Scenario: Powering 12-bit ADCs and analog front-ends in factory automation sensors. IC Role / Device Role / Timing Role: Local 8 V rail generator providing clean, stable bias for precision analog circuits. Use Value: 60 µV noise and 40 mV load regulation ensure <1 LSB error drift across 0–100 mA load swings. |
Use Scenario: Supplying 8 V to legacy 8-bit microcontrollers with integrated 8 V I/O buffers. IC Role / Device Role / Timing Role: Fixed-voltage source replacing discrete Zener/resistor networks in cost-sensitive control boards. Use Value: 6 mA quiescent current reduces standby power by >50% versus Zener-based solutions. |
| Programmable Logic Controller (PLC) I/O Module | Medical Diagnostic Instrument Auxiliary Rail |
|
Use Scenario: Generating isolated 8 V for digital isolator biasing and optocoupler LED drivers. IC Role / Device Role / Timing Role: On-card regulator eliminating noise coupling from shared 24 V backplane supplies. Use Value: 45 dB SVR at 120 Hz suppresses ripple from 50/60 Hz transformer-derived inputs. |
Use Scenario: Providing regulated 8 V to low-noise op-amps in ECG signal conditioning stages. IC Role / Device Role / Timing Role: Secondary low-noise supply derived from main 12 V or 15 V system rail. Use Value: Thermal shutdown prevents overheating during extended diagnostic test cycles in enclosed housings. |
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 |
|---|---|---|---|
| LM78L08ACZ/NOPB | ±5% output tolerance (vs. ±4%), higher quiescent current (5.5–8 mA), TO-92 only; no SO-8 option. | Limited thermal performance (RthJA = 200 °C/W) restricts use in high-ambient or high-power-density layouts. | Select if TO-92 through-hole assembly is required and tighter output tolerance is not critical. |
| MC78L08CP | ±5% tolerance, 100 mA rating, TO-92 package; lacks SO-8 variant and has higher dropout (2 V). | Not suitable for space-constrained PCBs needing surface-mount packaging or sub-2 V headroom operation. | Prefer for legacy designs already using ON Semiconductor's footprint and qualification baseline. |
Compared with LM78L08ACZ/NOPB and MC78L08CP, the L78L08CD13TR offers superior thermal management via SO-8 flag bonding, tighter output tolerance, and lower dropout - making it optimal for modern SMT-based industrial and medical systems demanding reliability and density.
Availability
L78L08CD13TR is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC I/O modules, medical diagnostic instrument auxiliary rails, and microcontroller core supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for L78L08CD13TR 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 headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The L78L series belongs to ST's legacy linear regulator product line, engineered specifically for cost-effective, robust local regulation in space- and power-constrained embedded systems - emphasizing simplicity, reliability, and ease of integration.
FAQ
What is the maximum input voltage for L78L08CD13TR?
The absolute maximum input voltage is 35 V when regulating to 8 V, as specified in Table 1 of DS0424 Rev 30. Exceeding this risks permanent damage due to internal junction breakdown. For reliable operation, maintain VI ≤ 30 V with adequate derating margin, especially at elevated ambient temperatures.
Does L78L08CD13TR require input and output capacitors?
Yes - ST specifies a 0.33 µF ceramic capacitor on the input and a 0.1 µF ceramic capacitor on the output, placed as close as possible to the device pins. These stabilize regulation, prevent oscillation, and improve transient response; omitting them may cause instability or excessive noise.
Can L78L08CD13TR be used in parallel to increase output current?
No - the L78L08CD13TR is not designed for parallel operation. Its output voltage tolerance (±4%) and lack of current-sharing circuitry mean mismatched units will cause one device to dominate conduction, leading to thermal imbalance and premature failure.
Is L78L08CD13TR RoHS-compliant and halogen-free?
Yes - the L78L08CD13TR carries ECOPACK2 compliance, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Full environmental documentation is available in ST's ECOPACK database at www.st.com/ecopack.
L78L08CD13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5.5 mA
- Current - Supply (Max):
- 6 mA
- PSRR:
- 45dB (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
L78L08CD13TR FAQ
1.How can I place an order for L78L08CD13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L78L08CD13TR 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 L78L08CD13TR reliable?
The price and inventory of L78L08CD13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78L08CD13TR is usually 5 days.
3.What payment methods are accepted for L78L08CD13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78L08CD13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L78L08CD13TR?
L78L08CD13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L78L08CD13TR 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 L78L08CD13TR?
For technical support, including L78L08CD13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78L08CD13TR requirements.
6.How does Aetrix verify that L78L08CD13TR is sourced from the original manufacturer or authorized distributors?
All L78L08CD13TR 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 L78L08CD13TR meets industry standards.
7.What is the process for return or replacement of L78L08CD13TR?
All L78L08CD13TR units undergo pre-shipment inspection (PSI). If there is an issue with L78L08CD13TR, 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 L78L08CD13TR part is unused and in its original packaging.
Return procedure for L78L08CD13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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