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onsemi MC78L09ABPRA
- Part No.:
- MC78L09ABPRA
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MC78L09ABPRA.pdf
- Description:
- IC REG LINEAR 9V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,769
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Product details
Overview
MC78L09ABPRA from onsemi is a 9.0 V, 100 mA fixed-output positive linear voltage regulator in TO-92 package with internal short-circuit current limiting and thermal shutdown protection. It delivers stable DC power for low-current analog circuits, microcontroller peripherals, and sensor interfaces where input-to-output differential voltage exceeds 1.7 V.
For engineers reviewing the MC78L09ABPRA datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed output voltage tolerance (±5% at +25°C), dropout voltage of 1.7 V, thermal shutdown at 150°C, and compatibility with standard 0.33 µF input / 0.1 µF output capacitor configuration.
Technical Context
The MC78L09ABPRA implements a monolithic series-pass transistor architecture with built-in current-limiting circuitry and thermal overload protection. Its regulation loop maintains output stability across load currents from 1.0 mA to 100 mA and input voltages from 11.5 V to 24 V.
Designed for operation over −40°C to +125°C junction temperature range, it features 200°C/W junction-to-ambient thermal resistance in TO-92 package and requires no external components for basic regulation. Input bias current remains ≤6.0 mA at +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 9.0 V ±5% at +25°C; ensures stable supply for 9 V logic or analog rails |
| Max Output Current | 100 mA; sufficient for powering small microcontrollers or op-amps |
| Dropout Voltage | 1.7 V typical at +25°C; defines minimum input headroom required for regulation |
| Line Regulation | 20 mV max over 11.5–24 V input; limits output drift due to input ripple or variation |
| Load Regulation | 15 mV max over 1–100 mA load; maintains voltage accuracy under dynamic load changes |
| Ripple Rejection | 57 dB typical at 120 Hz; suppresses AC noise from unregulated supplies |
| Junction Temp Limit | 150°C with automatic thermal shutdown; prevents damage during overload or poor heatsinking |
Pinout & Package
MC78L09ABPRA uses the TO-92 plastic package (Case 029), with leads bent for tape-and-reel mounting. Thermal resistance is 200°C/W junction-to-ambient; no heatsink required for ≤625 mW dissipation at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 9.0 V DC output; connects directly to load and output capacitor |
| 2 | Ground | Common reference for input and output; must share ground plane with source and load |
| 3 | Input | Unregulated DC input; must exceed 10.7 V (9.0 V + 1.7 V dropout) for proper regulation |
Key Features
| Feature | Design Value |
|---|---|
| Internal Short-Circuit Protection | Limits output current to safe level during fault, preventing device destruction |
| Thermal Overload Shutdown | Disables output above 150°C junction temperature, enabling automatic recovery on cooldown |
| No External Components Required | Operates stably with only input and output bypass capacitors (0.33 µF / 0.1 µF) |
| Pb-Free TO-92 Package | Complies with RoHS; compatible with standard through-hole reflow or wave soldering |
| −40°C to +125°C Operating Range | Validated for automotive under-hood and industrial control environments |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Powering analog temperature/humidity sensors in factory automation panels. IC Role / Device Role / Timing Role: Provides clean, stable 9 V rail isolated from noisy 24 V plant supply. Use Value: Maintains sensor accuracy by rejecting >57 dB of 120 Hz ripple and holding ±5% output tolerance across −40°C to +85°C operating range. | Use Scenario: Supplying 9 V to door lock actuators and interior lighting drivers. IC Role / Device Role / Timing Role: Regulates battery-derived 12–14 V input to fixed 9 V for actuator logic and driver biasing. Use Value: Internal thermal shutdown prevents latch-up during sustained 100 mA loads in confined enclosures; −40°C start-up capability ensures cold-weather reliability. |
| Legacy Microcontroller Peripherals | Low-Power Instrumentation |
Use Scenario: Powering RS-232 line drivers and EEPROM programmers in embedded test fixtures. IC Role / Device Role / Timing Role: Delivers regulated 9 V from variable wall adapter inputs (12–18 V). Use Value: 20 mV line regulation ensures consistent driver output swing despite input ripple; TO-92 footprint enables compact board layout. | Use Scenario: Biasing precision op-amps and ADC references in portable multimeters. IC Role / Device Role / Timing Role: Supplies ultra-low-noise 9 V reference rail with minimal quiescent current impact. Use Value: 60 µV RMS output noise (10 Hz–100 kHz) preserves signal integrity; load regulation ≤15 mV maintains reference stability across measurement ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L09ACPG | Same 9 V output and TO-92 package, but rated for 0°C to +125°C (not −40°C) | Not suitable for automotive or extended-temperature industrial use | Select MC78L09ABPRA when operation below 0°C is required |
| LM78L09ACZ | Pin-compatible 9 V regulator; higher quiescent current (5.5 mA vs. 3.0 mA typ), lower ripple rejection (45 dB vs. 57 dB) | Less effective in high-noise environments; reduced efficiency in battery-powered systems | Choose MC78L09ABPRA for better noise immunity and wider temperature range |
Compared with MC78L09ACPG and LM78L09ACZ, MC78L09ABPRA provides guaranteed −40°C operation and superior 57 dB ripple rejection-critical for automotive and industrial applications where input noise and ambient extremes challenge regulation stability.
Availability
MC78L09ABPRA is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, legacy microcontroller peripherals, and low-power instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MC78L09ABPRA 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC78L00A Series-including MC78L09ABPRA-is designed for cost-sensitive, low-power linear regulation in space-constrained systems where simplicity, ruggedness, and wide temperature operation are essential.
FAQ
What is the guaranteed output voltage tolerance for MC78L09ABPRA over temperature?
The MC78L09ABPRA guarantees output voltage within ±5% of nominal 9.0 V across its full operating junction temperature range of −40°C to +125°C, with tighter ±2% tolerance at +25°C per datasheet specifications. This ensures reliable operation in automotive and industrial environments where ambient temperatures vary widely.
Does MC78L09ABPRA require external capacitors for stable operation?
MC78L09ABPRA does not require external compensation capacitors for stability, but a 0.33 µF input bypass capacitor is recommended when connected via long traces to the power supply filter, and a 0.1 µF output capacitor improves transient response. These values are validated in the MC78L09ABPRA datasheet for all operating conditions.
What is the maximum input voltage rating for MC78L09ABPRA?
The absolute maximum input voltage for MC78L09ABPRA is 35 V DC for devices rated at 12–18 V output, and 40 V DC for 24 V output variants. Since MC78L09ABPRA is a 9 V regulator, its maximum rated input is 35 V DC per the "Input Voltage (12 V–18 V)" row in the Absolute Maximum Ratings table-ensuring safe operation with margin above its 24 V max recommended input.
Can MC78L09ABPRA be used as a current source?
Yes, MC78L09ABPRA can be configured as a constant-current source by connecting a resistor between output and adjust/ground terminals (per Figure 9 in the datasheet). For example, a 90 Ω resistor yields ~100 mA output current. However, power dissipation must remain within thermal limits-dropout voltage plus load drop determines total dissipation.
Is MC78L09ABPRA pin-compatible with other regulators in the MC78L00A family?
Yes, all TO-92 packaged MC78L00A Series regulators-including MC78L05ABPRA, MC78L08ABPRA, and MC78L09ABPRA-share identical pinout (Pin 1 = Output, Pin 2 = Ground, Pin 3 = Input) and package dimensions. This allows direct substitution across output voltages without PCB redesign, provided input voltage and thermal constraints are met for each variant.
MC78L09ABPRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- 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):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 57dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
MC78L09ABPRA FAQ
1.How can I place an order for MC78L09ABPRA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L09ABPRA 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 MC78L09ABPRA reliable?
The price and inventory of MC78L09ABPRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L09ABPRA is usually 5 days.
3.What payment methods are accepted for MC78L09ABPRA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L09ABPRA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L09ABPRA?
MC78L09ABPRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L09ABPRA 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 MC78L09ABPRA?
For technical support, including MC78L09ABPRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L09ABPRA requirements.
6.How does Aetrix verify that MC78L09ABPRA is sourced from the original manufacturer or authorized distributors?
All MC78L09ABPRA 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 MC78L09ABPRA meets industry standards.
7.What is the process for return or replacement of MC78L09ABPRA?
All MC78L09ABPRA units undergo pre-shipment inspection (PSI). If there is an issue with MC78L09ABPRA, 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 MC78L09ABPRA part is unused and in its original packaging.
Return procedure for MC78L09ABPRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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