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STMicroelectronics L78L09ABD13TR
- Part No.:
- L78L09ABD13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L78L09ABD13TR.pdf
- Description:
- IC REG LINEAR 9V 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,333
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Product details
Overview
L78L09ABD13TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 9 V output at up to 100 mA, featuring internal current limiting, thermal shutdown, and short-circuit protection. It operates across -40 °C to +125 °C junction temperature, supports input voltages up to 30 V (for VO = 9 V), and achieves ±4% output voltage tolerance at 25 °C. It is used in local on-card regulation for noise-sensitive analog subsystems in industrial control modules.
For engineers reviewing the L78L09ABD13TR datasheet, L78L09ABD13TR pinout, L78L09ABD13TR application, or L78L09ABD13TR equivalent, this device serves as a drop-in replacement for legacy 9 V Zener/resistor regulators-offering lower quiescent current (6 mA typ.), improved line/load regulation (150 mV/40 mV), and enhanced supply voltage rejection (37–44 dB at 120 Hz).
Technical Context
The L78L09ABD13TR implements a monolithic silicon-based series pass architecture with built-in foldback current limiting and thermal overload protection. Its internal circuitry ensures stable regulation without external components while maintaining low output noise (70 µV RMS, 10 Hz–100 kHz) and predictable dropout behavior (1.7 V typical at 40 mA).
It is specified for operation over the extended industrial temperature range (-40 °C to +125 °C), with guaranteed performance under varying load (1–100 mA) and input voltage (11.5–23 V). The SO-8 package variant uses internally bonded pins 2, 3, 6, and 7 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 | 9 V ±4% at 25 °C; maintains 8.55–9.45 V across 1–40 mA load and 11.5–23 V input - enables stable biasing of analog sensors and op-amps. |
| Max Output Current | 100 mA continuous - sufficient for powering small microcontrollers, logic ICs, or sensor signal chains without external pass transistors. |
| Dropout Voltage | 1.7 V typical at 40 mA - allows operation from 11.5 V minimum input, supporting 12 V rail systems with margin. |
| Quiescent Current | 6 mA typical at 25 °C, 5.5 mA at 125 °C - minimizes standby power loss in battery-backed or energy-constrained designs. |
| Supply Voltage Rejection | 37–44 dB at 120 Hz - suppresses ripple from unregulated DC supplies or rectified AC sources feeding downstream analog circuitry. |
| Output Noise | 70 µV RMS (10 Hz–100 kHz) - suitable for low-noise analog front-ends in precision measurement applications. |
| Thermal Protection | Internal thermal shutdown activates above safe junction temperature - prevents permanent damage during sustained overload or poor PCB heatsinking. |
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 dissipation. Requires ≥6 cm² copper pour on PCB for rated power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | VIN | Unregulated positive input supply; must exceed VO + VDROP (≥10.7 V) for regulation. |
| Pin 2 (Ground) | GND | Common reference for input and output; electrically tied to die flag for thermal path. |
| Pin 3 (Output) | VOUT | Regulated +9 V output; requires 0.1 µF ceramic capacitor (CO) for stability per datasheet. |
| Pins 4–5, 7–8 | No Connect / Flag Tie | Internally shorted to die flag (pins 2/3/6/7); used for PCB thermal anchoring - not signal pins. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Stable regulation achieved with only input (0.33 µF) and output (0.1 µF) capacitors - reduces BOM count and layout complexity. |
| Thermal overload protection | Automatic shutdown below safe junction temperature (125 °C max operating), with auto-recovery upon cooling - eliminates need for external thermal monitoring. |
| Short-circuit protection | Foldback current limiting limits output current to <100 mA during hard shorts - prevents catastrophic failure and enables safe restart. |
| Low quiescent current | 6 mA typical at room temperature - improves efficiency in always-on subsystems such as real-time clocks or supervisory circuits. |
| Fixed 9 V output with tight tolerance | ±4% over full temperature and load range - ensures consistent biasing for 9 V–compatible analog ICs without trimming. |
Applications
| Industrial Sensor Interface | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Powering 4–20 mA current loop transmitters and bridge-based pressure sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Local 9 V regulation for sensor excitation and op-amp signal conditioning stages. Use Value: Eliminates noise coupling from shared 24 V system rails and maintains accuracy over -40 °C to +85 °C ambient. |
Use Scenario: Providing isolated 9 V bias to digital isolators and level-shifting buffers in modular PLC backplanes. IC Role / Device Role / Timing Role: Fixed-voltage supply for interface ICs requiring clean, stable 9 V with minimal ripple. Use Value: Enables reliable communication between CPU and field I/O via optocouplers without external filtering. |
| Medical Diagnostic Instrumentation | Automotive Body Control Module (BCM) |
Use Scenario: Supplying analog front-end (AFE) circuitry in portable ECG monitors where low noise and thermal robustness are critical. IC Role / Device Role / Timing Role: Low-noise 9 V source for instrumentation amplifiers and ADC reference buffers. Use Value: 70 µV output noise and 44 dB SVR ensure sub-mV signal integrity in millivolt-level biopotential measurements. |
Use Scenario: Regulating 9 V for LIN bus transceivers and window lift motor drivers in non-safety-critical BCM subsystems. IC Role / Device Role / Timing Role: Robust local regulator tolerant of automotive load dump (up to 30 V transient input). Use Value: Withstands 30 V absolute max input and operates down to -40 °C - meets AEC-Q100 Class 2 ambient requirements. |
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 |
|---|---|---|---|
| LM78L09ACZ/NOPB | ±5% tolerance, 0–125 °C operating range, TO-92 package only, higher quiescent current (5.5–8.5 mA). | Lacks extended temperature rating and SO-8 thermal performance - unsuitable for industrial environments below -25 °C or high-power-density layouts. | Select if cost sensitivity outweighs thermal performance and extended temp needs; verify PCB heatsinking for >50 mA loads. |
| MC78L09ACP | ±5% tolerance, TO-92 only, no SO-8 option, 100 mA rating but higher dropout (2.0 V min) and lower SVR (35 dB). | Lower PSRR and wider voltage tolerance reduce suitability for noise-sensitive analog circuits and wide-input-range designs. | Prefer only for legacy board replacements where footprint and thermal specs are not constrained. |
Compared with LM78L09ACZ/NOPB and MC78L09ACP, the L78L09ABD13TR offers tighter tolerance (±4%), extended temperature support (-40 °C), superior thermal management via SO-8 flag bonding, and higher supply rejection - making it optimal for new industrial and automotive designs demanding reliability and low noise.
Availability
L78L09ABD13TR is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) I/O modules, and medical diagnostic instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for L78L09ABD13TR 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-constrained and thermally demanding embedded systems - emphasizing simplicity, reliability, and compatibility with legacy designs.
FAQ
What is the maximum input voltage for L78L09ABD13TR?
The absolute maximum DC input voltage is 30 V when regulating 9 V output, as specified in Table 1 of DS0424 Rev 30. Exceeding this risks permanent damage even with thermal protection active. For reliable operation, maintain VI ≤ 23 V under normal load conditions to ensure adequate headroom and longevity.
Does L78L09ABD13TR require input and output capacitors?
Yes - ST specifies a 0.33 µF ceramic capacitor (CI) on the input and a 0.1 µF ceramic capacitor (CO) on the output for stability and transient response. Omitting CO may cause oscillation; using electrolytic instead of ceramic degrades high-frequency noise suppression and increases ESR-related instability risk.
Can L78L09ABD13TR be used in parallel for higher current?
No - the L78L09ABD13TR lacks current-sharing capability and has no built-in balancing features. Parallel connection risks thermal runaway due to mismatched output voltages and unequal current distribution. For >100 mA, use an external pass transistor configured per Figure 14 in DS0424.
Is L78L09ABD13TR RoHS and REACH compliant?
Yes - the L78L09ABD13TR carries ECOPACK2 compliance, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full material declarations and substance reports are available through ST's official product page and environmental documentation portal.
L78L09ABD13TR 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):
- 30V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5.5 mA
- Current - Supply (Max):
- 6 mA
- PSRR:
- 44dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
L78L09ABD13TR FAQ
1.How can I place an order for L78L09ABD13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L78L09ABD13TR 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 L78L09ABD13TR reliable?
The price and inventory of L78L09ABD13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78L09ABD13TR is usually 5 days.
3.What payment methods are accepted for L78L09ABD13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78L09ABD13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L78L09ABD13TR?
L78L09ABD13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L78L09ABD13TR 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 L78L09ABD13TR?
For technical support, including L78L09ABD13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78L09ABD13TR requirements.
6.How does Aetrix verify that L78L09ABD13TR is sourced from the original manufacturer or authorized distributors?
All L78L09ABD13TR 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 L78L09ABD13TR meets industry standards.
7.What is the process for return or replacement of L78L09ABD13TR?
All L78L09ABD13TR units undergo pre-shipment inspection (PSI). If there is an issue with L78L09ABD13TR, 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 L78L09ABD13TR part is unused and in its original packaging.
Return procedure for L78L09ABD13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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