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Texas Instruments UA78L15ACDRM3
- Part No.:
- UA78L15ACDRM3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA78L15ACDRM3.pdf
- Description:
- 100-MA 30-VLINEAR VOLTAGE REGULA
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
UA78L15ACDRM3 from Texas Instruments is a fixed-output +15 V positive-voltage linear regulator delivering up to 100 mA output current, with 1.7 V dropout voltage at 25°C, 3.8 mA quiescent current, and input voltage range of 17.5 V to 30 V (legacy chip) or 17.5 V to 45 V (new chip). It operates across –40°C to +125°C junction temperature and is used for local regulation in motor drives and building automation systems.
For engineers reviewing the UA78L15ACDRM3 datasheet, UA78L15ACDRM3 pinout, UA78L15ACDRM3 application, or UA78L15ACDRM3 equivalent, key selection criteria include guaranteed ±3% output voltage tolerance over full temperature and load range, built-in thermal shutdown and short-circuit protection, no external capacitor requirement for stability, and compatibility with TO-92, SOT-89, and SOIC packages.
Technical Context
The UA78L15ACDRM3 implements a classic series-pass linear regulator architecture with internal NPN pass transistor, error amplifier, reference, and protection circuitry. Its design supports stable operation without external compensation components across 1 mA–100 mA load currents and input-to-output differentials down to 1.7 V.
It features dual thermal shutdown and current-limiting mechanisms that activate under sustained overload or elevated junction temperature. The device is characterized for both legacy (0°C to +125°C) and new (–40°C to +125°C) silicon versions, with the RM3 suffix indicating the 3-pin SOT-89 package variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | +15 V nominal, ±3% tolerance (14.25 V to 15.75 V) over –40°C to +125°C and 1–70 mA load |
| Max output current | 100 mA - sufficient for biasing op-amps, sensors, and logic interfaces in space-constrained designs |
| Dropout voltage | 1.7 V at 25°C - enables operation with minimal headroom from 17.5 V input minimum |
| Quiescent current | 3.8 mA typical - low static power draw suitable for always-on subsystems |
| Input voltage range | 17.5 V to 30 V (legacy), 17.5 V to 45 V (new chip) - supports wide industrial supply rails |
| Thermal shutdown | Active above ~150°C junction - protects against sustained overload or poor heatsinking |
| Ripple rejection | 40–45 dB at 120 Hz - suppresses AC line noise on unregulated DC inputs |
Pinout & Package
UA78L15ACDRM3 is supplied in a 3-pin SOT-89 package (4.5 mm × 4.095 mm), with exposed thermal pad for enhanced heat dissipation. Pin 1 = OUTPUT, Pin 2 = COMMON (GND), Pin 3 = INPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTPUT) | Regulated output node | Delivers stable +15 V; requires 0.1 µF ceramic capacitor placed adjacent to pin for optimal transient response |
| 2 (COMMON) | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance connection to system ground plane |
| 3 (INPUT) | Unregulated DC input | Accepts 17.5–45 V; requires 0.33 µF ceramic capacitor near pin to suppress source inductance-induced ringing |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Internally compensated for stability across full 1–100 mA load range and temperature - eliminates BOM cost and layout area |
| Short-circuit current limiting | Self-limiting foldback protection prevents destructive current during output faults - enables safe operation without external fusing |
| Thermal shutdown | Automatic shutdown at ~150°C junction temperature with hysteresis - prevents permanent damage during overheating events |
| Wide operating temperature | Specified from –40°C to +125°C junction - qualified for industrial and automotive under-hood environments |
| Low dropout voltage | 1.7 V at 25°C - allows use with lower-input supplies than standard 78xx regulators, improving efficiency in margin-constrained systems |
Applications
| Motor Drive Power Supply | Building Automation Sensor Node |
|---|---|
Use Scenario: Local +15 V rail generation for gate drivers and analog front-ends in BLDC motor controllers. IC Role / Device Role / Timing Role: Fixed-output linear regulator providing clean, low-noise bias for precision current sensing and PWM signal conditioning. Use Value: Eliminates need for external compensation capacitors and reduces EMI susceptibility versus switching alternatives in noise-sensitive drive stages. | Use Scenario: Powering temperature/humidity sensors and RS-485 transceivers in HVAC control panels. IC Role / Device Role / Timing Role: On-board voltage regulator delivering stable +15 V to analog sensor ICs and half-duplex communication interfaces. Use Value: Guaranteed ±3% output accuracy over –40°C to +125°C ensures consistent sensor excitation and transceiver operation across environmental extremes. |
| Factory Automation I/O Module | Flow Transmitter Signal Conditioning |
Use Scenario: Generating isolated +15 V for analog output drivers (4–20 mA loop) in programmable logic controller (PLC) expansion modules. IC Role / Device Role / Timing Role: Local regulation stage converting shared 24 V backplane supply to precise +15 V reference for DAC and op-amp circuits. Use Value: 40–45 dB ripple rejection at 120 Hz suppresses residual AC ripple from rectified industrial supplies, preserving analog output accuracy. | Use Scenario: Biasing piezoresistive pressure sensors and instrumentation amplifiers in industrial flow meters. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying excitation voltage and analog signal chain rails. Use Value: 82 µV (legacy) or 388 µV (new chip) output noise ensures minimal contribution to sensor measurement uncertainty in high-resolution metering applications. |
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/LFT7 | Same +15 V output, 100 mA rating, but TO-92 package only; higher quiescent current (5.5 mA typ); no SOT-89 option | Limited thermal performance in high-ambient environments due to TO-92 package; not drop-in compatible with SOT-89 footprint | Select when TO-92 mounting is preferred and thermal load is light; verify PCB land pattern match before substitution |
| TL78L15ACDR | Same SOT-89-3 package and +15 V output; lower max input voltage (30 V absolute max vs. 45 V for UA78L15ACDRM3); identical 1.7 V dropout | Not suitable for 40–45 V transient-tolerant industrial inputs; otherwise functionally aligned for space-constrained +15 V regulation | Choose for cost-sensitive designs where input never exceeds 30 V; confirm input surge immunity requirements |
Compared with LM78L15ACZ/LFT7 and TL78L15ACDR, UA78L15ACDRM3 offers broader input voltage support (up to 45 V), superior thermal performance via SOT-89 package, and tighter output voltage tolerance over temperature - making it preferable for demanding industrial environments requiring robustness and long-term stability.
Availability
UA78L15ACDRM3 is available at Aetrix Electronics and suitable for motor drives, building automation, and factory automation applications requiring stable component supply, extended temperature operation, and proven reliability in harsh environments.
Supply support for UA78L15ACDRM3 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management ICs.
The UA78L series was designed specifically for cost-effective, robust local regulation in industrial, automotive, and appliance systems - emphasizing simplicity, reliability, and wide-temperature operation without external components.
FAQ
What is the maximum input voltage rating for UA78L15ACDRM3?
The UA78L15ACDRM3 has an absolute maximum input voltage of 45 V for the new chip version and 35 V for the legacy chip version. Per TI's SLVS010X datasheet, recommended operating conditions specify 17.5 V to 30 V for legacy and 17.5 V to 45 V for new silicon. Exceeding these limits risks permanent damage.
Does UA78L15ACDRM3 require external capacitors for stability?
No - UA78L15ACDRM3 is internally compensated and stable without external capacitors across its full 1–100 mA load range and temperature specification. However, TI recommends a 0.33 µF input and 0.1 µF output ceramic capacitor for optimal transient response and noise suppression, as documented in Section 6.3 of the UA78L datasheet.
What is the output voltage tolerance of UA78L15ACDRM3 over temperature and load?
For UA78L15ACDRM3 (AC-grade, new chip), output voltage is specified as 14.75 V to 15.425 V at 25°C, and 14.575 V to 15.45 V over –40°C to +125°C and 1–70 mA load - representing ±3% tolerance. This is confirmed in Table 6.13 of the SLVS010X datasheet.
Is UA78L15ACDRM3 pin-compatible with other UA78Lxx variants in SOT-89?
Yes - all UA78Lxx devices in the SOT-89-3 package (e.g., UA78L05ACDRM3, UA78L12ACDRM3) share identical pinout: Pin 1 = OUTPUT, Pin 2 = COMMON, Pin 3 = INPUT. This allows direct substitution within the same package family when output voltage and thermal requirements align.
What thermal metrics apply to UA78L15ACDRM3 in SOT-89 package?
Per Section 6.4 of the datasheet, UA78L15ACDRM3 in PK (SOT-89) package has RθJA = 54.7°C/W, RθJC(bot) = 7.7°C/W, and ψJB = 9.7°C/W. These values assume JEDEC-standard PCB mounting; actual thermal performance depends on copper area, layer count, and airflow in the end application.
UA78L15ACDRM3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- UA78L
- 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):
- 1.7V @ 40mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 45dB ~ 39dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Current, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA78L15ACDRM3 FAQ
1.How can I place an order for UA78L15ACDRM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78L15ACDRM3 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 UA78L15ACDRM3 reliable?
The price and inventory of UA78L15ACDRM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78L15ACDRM3 is usually 5 days.
3.What payment methods are accepted for UA78L15ACDRM3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA78L15ACDRM3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA78L15ACDRM3?
UA78L15ACDRM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78L15ACDRM3 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 UA78L15ACDRM3?
For technical support, including UA78L15ACDRM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78L15ACDRM3 requirements.
6.How does Aetrix verify that UA78L15ACDRM3 is sourced from the original manufacturer or authorized distributors?
All UA78L15ACDRM3 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 UA78L15ACDRM3 meets industry standards.
7.What is the process for return or replacement of UA78L15ACDRM3?
All UA78L15ACDRM3 units undergo pre-shipment inspection (PSI). If there is an issue with UA78L15ACDRM3, 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 UA78L15ACDRM3 part is unused and in its original packaging.
Return procedure for UA78L15ACDRM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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