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Renesas HA178L12A-TZ-E
- Part No.:
- HA178L12A-TZ-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
HA178L12A-TZ-E.pdf
- Description:
- IC REG LINEAR FIXED STNDRD REG
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
HA178L12A-TZ-E from Renesas is a three-terminal fixed-output linear voltage regulator delivering 12 V ±5% at up to 150 mA, housed in a TO-92MOD package with 800 mW power dissipation capability. It integrates overcurrent and thermal protection circuits and serves as a stable local supply for microcontroller I/O rails, sensor signal conditioning, and low-power analog circuitry.
For engineers reviewing the HA178L12A-TZ-E datasheet, HA178L12A-TZ-E pinout, HA178L12A-TZ-E application, or HA178L12A-TZ-E equivalent, key selection criteria include output tolerance (±5%), dropout voltage (1.7 V typ.), ripple rejection (52 dB at 120 Hz), quiescent current (3.1–6.5 mA), and thermal shutdown behavior under sustained load.
Technical Context
The HA178L12A-TZ-E implements a classic series-pass regulator architecture with an internal 2.5 V reference, error amplifier, and thermal foldback protection. Its output voltage is set by internal resistor ratios, eliminating external feedback components.
It operates across –40°C to +85°C ambient temperature and requires only 0.33 μF input and 0.1 μF output ceramic capacitors for stability. Dropout voltage remains constant at 1.7 V (typ.) across junction temperatures from 0°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 12 V ±5% (guaranteed over full temperature and line/load range) |
| Max output current | 150 mA (supports logic-level peripherals and small-signal analog stages) |
| Dropout voltage | 1.7 V (typ. at 25°C; enables operation from 13.7 V min. input) |
| Ripple rejection | 52 dB at 120 Hz (suppresses rectified AC noise in wall-adapter-fed systems) |
| Quiescent current | 3.1–6.5 mA (low no-load draw suitable for battery-backed standby circuits) |
| Thermal protection | Integrated junction temperature shutdown (prevents latch-up during overload) |
| Line regulation | 100–200 mV (specifies output drift over 16–27 V input range) |
Pinout & Package
HA178L12A-TZ-E uses the TO-92MOD package (JEITA code PRSS0003DC-A), a through-hole plastic case with 0.1" lead pitch, 8.0 mm body length, and 0.35 g mass. Pin 1 is OUT, Pin 2 is GND, Pin 3 is IN - verified per Renesas block diagram and pin arrangement diagram on page 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output terminal | Delivers stable 12 V to load; requires 0.1 μF ceramic capacitor to ground for stability |
| 2 (GND) | Reference and return path | Common ground for internal error amp and protection circuits; must be low-impedance |
| 3 (IN) | Unregulated input supply | Accepts 14.5–27 V DC; requires 0.33 μF ceramic capacitor to ground near pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external resistor network; reduces BOM count and layout area |
| ±5% output tolerance | Tighter than standard ±8% variants (e.g., HA178L12-TZ), improving system margin for 12 V logic |
| Overcurrent protection | Current-limiting folds back above ~180 mA, preventing damage during short-circuit events |
| Thermal shutdown | Activates at ~150°C junction temperature, allowing safe recovery after cooling |
| TO-92MOD package | Compatible with legacy through-hole assembly; supports manual prototyping and repair |
Applications
| Industrial Sensor Interface | Microcontroller Power Rail |
|---|---|
Use Scenario: Powering analog front-end circuitry for pressure/temperature transducers in factory automation nodes. IC Role / Device Role / Timing Role: Local 12 V regulator supplying op-amps, ADC references, and signal-conditioning ICs. Use Value: ±5% tolerance ensures consistent sensor excitation and reference stability across temperature; thermal protection prevents field failure during ambient spikes. |
Use Scenario: Providing clean 12 V to I/O peripherals (e.g., level shifters, optocouplers) of 8-bit MCUs in HVAC controllers. IC Role / Device Role / Timing Role: Secondary regulator downstream of main 24 V supply, decoupling digital noise from analog subsystems. Use Value: 52 dB ripple rejection suppresses switching noise from upstream DC/DC converters; 150 mA capacity supports multiple I/O drivers simultaneously. |
| Legacy Equipment Replacement | Low-Power Analog Instrumentation |
Use Scenario: Direct replacement for obsolete 12 V regulators in service manuals for test equipment built before 2010. IC Role / Device Role / Timing Role: Pin-compatible drop-in substitute for aging 78L12 variants requiring same TO-92 footprint and electrical specs. Use Value: Identical pinout (IN-GND-OUT), same 1.7 V dropout, and ±5% tolerance ensure zero PCB rework and functional equivalence. |
Use Scenario: Biasing precision op-amps and voltage references in portable multimeters and calibration tools. IC Role / Device Role / Timing Role: Low-noise, thermally stable 12 V source for high-accuracy analog signal chains. Use Value: –0.3 mV/°C temperature coefficient minimizes drift-induced measurement error; 800 mW dissipation allows 150 mA at 70°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM78L12ACZ/NOPB | ±5% tolerance, TO-92 package, but higher quiescent current (5.5 mA typ.) and lower PSRR (45 dB) | Lacks integrated thermal foldback; relies on external heatsinking above 100 mA | Choose when LM78L12ACZ/NOPB is already qualified in legacy designs and thermal margin is sufficient |
| MC78L12ACP | ±5% tolerance, TO-92, but no overcurrent foldback-only current limiting-and wider dropout (2.0 V min.) | Higher dropout reduces usable input range; less robust under sustained overload | Prefer HA178L12A-TZ-E where thermal reliability in unventilated enclosures is critical |
Compared with LM78L12ACZ/NOPB and MC78L12ACP, HA178L12A-TZ-E delivers superior thermal safety via foldback protection, tighter load regulation (10 mV vs. ≥20 mV), and better ripple suppression-making it optimal for compact, sealed, or high-ambient industrial modules.
Availability
HA178L12A-TZ-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O power rails, legacy equipment replacement, and low-power analog instrumentation requiring stable component supply and long-term manufacturability.
Supply support for HA178L12A-TZ-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 global semiconductor leader specializing in microcontrollers, analog power devices, and embedded solutions for industrial, automotive, and infrastructure markets.
The HA178L00 series was designed as cost-effective, robust three-terminal regulators for commercial-grade applications where simplicity, reliability, and TO-92 compatibility are prioritized over ultra-low IQ or adjustable output.
FAQ
What is the maximum input voltage rating for HA178L12A-TZ-E?
The absolute maximum input voltage for HA178L12A-TZ-E is 35 V, as specified in the Absolute Maximum Ratings table on page 4 of the datasheet. Operation above this voltage risks permanent damage. For reliable 12 V output, the recommended input range is 14.5 V to 27 V, ensuring adequate headroom while staying within safe thermal limits.
Does HA178L12A-TZ-E require external capacitors, and what values are recommended?
Yes, HA178L12A-TZ-E requires both input and output capacitors for stability and noise suppression. The standard application circuit specifies a 0.33 μF ceramic capacitor on the IN pin and a 0.1 μF ceramic capacitor on the OUT pin, placed as close as possible to the device leads. These values are validated across temperature and load conditions per the datasheet's Standard Circuit diagram on page 2.
How does the thermal protection in HA178L12A-TZ-E behave during overload?
HA178L12A-TZ-E features a thermal protection circuit that activates when junction temperature exceeds approximately 150°C. Unlike simple shutdown, it employs foldback current limiting-reducing output current progressively as temperature rises-to prevent thermal runaway and allow safe cooldown. Recovery occurs automatically once junction temperature falls below the hysteresis threshold.
Is HA178L12A-TZ-E pin-compatible with other 78L12-family regulators in TO-92 packages?
Yes, HA178L12A-TZ-E uses the standard TO-92MOD pinout (IN-GND-OUT, left-to-right when viewing the flat side), matching industry-standard 78L12 variants including LM78L12ACZ and MC78L12ACP. This enables direct mechanical and electrical substitution without PCB modification, provided input voltage and thermal constraints align.
What is the typical dropout voltage of HA178L12A-TZ-E, and how does it vary with load?
The typical dropout voltage of HA178L12A-TZ-E is 1.7 V at 25°C and 40 mA load, as confirmed in the Electrical Characteristics table on page 6. It remains stable across 1–150 mA output current and shows minimal variation with junction temperature-enabling predictable minimum input voltage calculation (e.g., 13.7 V min. for 12 V output at 40 mA).
HA178L12A-TZ-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-TZ-E FAQ
1.How can I place an order for HA178L12A-TZ-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HA178L12A-TZ-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-TZ-E reliable?
The price and inventory of HA178L12A-TZ-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-TZ-E is usually 5 days.
3.What payment methods are accepted for HA178L12A-TZ-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HA178L12A-TZ-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HA178L12A-TZ-E?
HA178L12A-TZ-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HA178L12A-TZ-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-TZ-E?
For technical support, including HA178L12A-TZ-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HA178L12A-TZ-E requirements.
6.How does Aetrix verify that HA178L12A-TZ-E is sourced from the original manufacturer or authorized distributors?
All HA178L12A-TZ-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-TZ-E meets industry standards.
7.What is the process for return or replacement of HA178L12A-TZ-E?
All HA178L12A-TZ-E units undergo pre-shipment inspection (PSI). If there is an issue with HA178L12A-TZ-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-TZ-E part is unused and in its original packaging.
Return procedure for HA178L12A-TZ-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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