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Renesas HA178L12A-E
- Part No.:
- HA178L12A-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
HA178L12A-E.pdf
- Description:
- IC REG LINEAR FIXED STNDRD REG
- Quantity:
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Inventory:8,364
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Product details
Overview
HA178L12A-E from Renesas Electronics is a 3-terminal fixed-output linear voltage regulator delivering +12 V with ±5% tolerance at up to 150 mA, featuring overcurrent and thermal shutdown protection in a TO-92 ModV package. It operates across –40°C to +85°C ambient temperature and supports industrial power rail stabilization for microcontroller peripherals and sensor interfaces.
For engineers reviewing the HA178L12A-E datasheet, HA178L12A-E pinout, HA178L12A-E application, or HA178L12A-E equivalent, key selection criteria include dropout voltage (1.7 V), ripple rejection (52 dB at 120 Hz), load regulation (≤50 mV), thermal protection behavior, and compatibility with 0.33 µF input / 0.1 µF output capacitor network.
Technical Context
The HA178L12A-E implements a classic series-pass regulator architecture with internal reference (2.5 V), error amplifier, and protection circuitry. Its thermal shutdown activates when junction temperature exceeds safe limits, and current limiting engages during overload conditions to prevent device damage.
Designed for low-noise, low-quiescent-current operation, it maintains stable output under varying line (14.5–27 V input) and load (1–150 mA) conditions. The device requires no external components beyond standard input/output capacitors and does not support adjustable output or enable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12 V ±5% (11.5–12.5 V at Tj = 25°C; ensures tight rail accuracy for logic-level peripherals) |
| Max Output Current | 150 mA (supports small-signal analog circuits and MCU I/O rails without external boost) |
| Dropout Voltage | 1.7 V (minimum VIN = 13.7 V for regulated 12 V output; defines minimum headroom requirement) |
| Ripple Rejection | 52 dB at 120 Hz (attenuates rectified AC noise; critical for clean analog supply domains) |
| Quiescent Current | 3.1–6.5 mA (low standby draw enables battery-backed subsystems with extended runtime) |
| Operating Temp | –40°C to +85°C ambient (validated for industrial-grade environmental resilience) |
| Power Dissipation | 800 mW (TO-92 ModV package; derates linearly above 25°C at 6.4 mW/°C) |
Pinout & Package
HA178L12A-E uses the TO-92 ModV package (JEITA code PRSS0003DC-A), a 3-pin through-hole plastic case with 2.54 mm lead pitch and 0.35 g typical mass. Pin 1 is OUT, Pin 2 is GND, Pin 3 is IN - confirmed per datasheet Figure on Page 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated +12 V supply node; connects directly to load and output capacitor (0.1 µF) |
| 2 | Ground | Common return path for input, output, and internal reference; must be low-impedance |
| 3 | Input | Unregulated DC input (≥13.7 V); requires 0.33 µF bypass capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Shutdown Protection | Automatically disables output when junction temperature exceeds safe threshold, preventing permanent damage during sustained overload or high ambient |
| Overcurrent Limiting | Clamps output current at ~150–200 mA to protect internal pass transistor and maintain reliability under short-circuit conditions |
| Fixed +12 V Output | Eliminates need for external feedback resistors; simplifies design and reduces BOM count in cost-sensitive applications |
| Low Quiescent Current | Typical 3.1 mA draw enables use in always-on subsystems where standby power budget is constrained |
| Industrial Temperature Range | Rated for continuous operation from –40°C to +85°C ambient, supporting deployment in factory automation and outdoor equipment |
Applications
| Microcontroller Power Supply | Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable +12 V rail to power ADC reference buffers and op-amp stages in an industrial pressure sensor module. IC Role / Device Role / Timing Role: Fixed-voltage linear regulator supplying clean analog domain power; no timing function. Use Value: Ripple rejection of 52 dB suppresses switching noise from adjacent DC-DC converters, preserving 12-bit measurement accuracy. | Use Scenario: Biasing photodiode transimpedance amplifiers and powering analog front-end ICs in optical smoke detectors. IC Role / Device Role / Timing Role: Primary 12 V supply source for analog signal chain; no clock or timing role. Use Value: ±5% output tolerance and –0.3 mV/°C tempco ensure consistent gain calibration across temperature without software compensation. |
| Legacy Industrial Control I/O | Embedded Display Backlight Driver Support |
Use Scenario: Powering discrete transistor-based 24 V-to-12 V level-shifting circuits for PLC digital input modules. IC Role / Device Role / Timing Role: Local 12 V rail generator for interface logic; no timing or communication function. Use Value: Overcurrent and thermal protection allow safe operation during field wiring faults or ESD events without fuse replacement. | Use Scenario: Supplying gate drive voltage for discrete N-channel MOSFETs controlling CCFL backlight inverters in medical panel displays. IC Role / Device Role / Timing Role: Dedicated 12 V bias supply for high-side gate drivers; no timing or PWM generation. Use Value: 150 mA output current and 1.7 V dropout enable direct drive of gate charge circuits without additional boost stages. |
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 |
|---|---|---|---|
| LM78L12ACZ/NOPB | Same TO-92 package, ±5% tolerance, but higher quiescent current (5.5 mA typ) and lower ripple rejection (45 dB) | Less effective in noise-sensitive analog rails; suitable where thermal margin is ample | Prefer HA178L12A-E when low-noise performance or tighter thermal management is required |
| MC78L12ACP | TO-92 package, ±6% tolerance, 100 mA max output, no thermal shutdown | Limited fault tolerance; unsuitable for unattended industrial deployments | HA178L12A-E offers superior protection and 50% higher current rating for same footprint |
Compared with LM78L12ACZ/NOPB and MC78L12ACP, HA178L12A-E delivers better ripple suppression, integrated thermal shutdown, and higher output current in identical TO-92 ModV packaging-making it optimal for space-constrained industrial analog power nodes requiring robustness and precision.
Availability
HA178L12A-E is available at Aetrix Electronics and suitable for industrial control systems, sensor signal conditioning modules, and legacy embedded display power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for HA178L12A-E 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
Renesas Electronics is a Japanese semiconductor manufacturer specializing in microcontrollers, analog power devices, and automotive SoCs, with global R&D and manufacturing infrastructure.
The HA178L00 Series was designed specifically for cost-effective, reliable fixed-voltage regulation in industrial and commercial equipment where simplicity, protection, and thermal resilience are prioritized over programmability or ultra-low IQ.
FAQ
What is the maximum input voltage rating for HA178L12A-E?
The absolute maximum input voltage for HA178L12A-E is 35 V, as specified in the Absolute Maximum Ratings table on Page 5 of the datasheet. Operation above this voltage risks permanent damage. For reliable regulation, input must remain within 14.5–27 V under normal load conditions per the Electrical Characteristics table for HA178L12A on Page 9. Always observe derating curves for elevated ambient temperatures.
Does HA178L12A-E require external capacitors, and what values are recommended?
Yes, HA178L12A-E requires both input and output capacitors for stability and noise suppression. The datasheet specifies 0.33 µF ceramic or tantalum at the input (VIN) and 0.1 µF at the output (VOUT), placed as close as possible to the respective pins. These values are validated for all operating conditions in the HA178L00 Series standard circuit on Page 3. Larger values may improve transient response but are not required.
Is HA178L12A-E pin-compatible with other regulators in the HA178Lxx family?
Yes, all HA178Lxx variants-including HA178L12A-E-share identical TO-92 ModV pinout (OUT-GND-IN) and package dimensions. This allows direct substitution across output voltages (e.g., HA178L05A-E, HA178L15A-E) without PCB changes, provided input voltage and load requirements remain compatible with the new output rail.
What protection features does HA178L12A-E include?
HA178L12A-E integrates two hardware protection mechanisms: overcurrent limiting and thermal shutdown. The overcurrent circuit limits output current to prevent damage during shorts or excessive loads, while the temperature protection circuit disables the output if junction temperature exceeds safe limits. Both functions are fully autonomous and require no external components, as shown in the Block Diagram on Page 3.
How does the output voltage tolerance of HA178L12A-E compare to the base HA178L12 variant?
HA178L12A-E has ±5% output voltage tolerance at Tj = 25°C (11.5–12.5 V), whereas the base HA178L12 variant has ±8% tolerance (11.22–12.78 V). This tighter specification makes HA178L12A-E suitable for applications demanding higher rail accuracy, such as precision analog front-ends or reference voltage generation where post-regulation filtering is impractical.
HA178L12A-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
HA178L12A-E FAQ
1.How can I place an order for HA178L12A-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HA178L12A-E 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 HA178L12A-E reliable?
The price and inventory of HA178L12A-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HA178L12A-E is usually 5 days.
3.What payment methods are accepted for HA178L12A-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HA178L12A-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HA178L12A-E?
HA178L12A-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HA178L12A-E 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 HA178L12A-E?
For technical support, including HA178L12A-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HA178L12A-E requirements.
6.How does Aetrix verify that HA178L12A-E is sourced from the original manufacturer or authorized distributors?
All HA178L12A-E 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 HA178L12A-E meets industry standards.
7.What is the process for return or replacement of HA178L12A-E?
All HA178L12A-E units undergo pre-shipment inspection (PSI). If there is an issue with HA178L12A-E, 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 HA178L12A-E part is unused and in its original packaging.
Return procedure for HA178L12A-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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