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Renesas UPC79M12HF-1-AZ
- Part No.:
- UPC79M12HF-1-AZ
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
UPC79M12HF-1-AZ.pdf
- Description:
- IC REG LINEAR NEG VOLTAGE REG
- Quantity:
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Inventory:1,033
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Product details
Overview
UPC79M12HF-1-AZ from Renesas Electronics is a three-terminal negative fixed-voltage linear regulator delivering −12 V output at up to 350 mA continuous current, with 1.1 V dropout voltage, 64 dB ripple rejection at 120 Hz, and 125–280 μVr.m.s. output noise (10 Hz–100 kHz). It serves as the primary negative rail in dual-supply analog circuits such as op-amp biasing, instrumentation amplifiers, and legacy industrial control systems requiring stable, low-noise DC power.
For engineers reviewing the UPC79M12HF-1-AZ datasheet, UPC79M12HF-1-AZ pinout, UPC79M12HF-1-AZ application, or UPC79M12HF-1-AZ equivalent, key selection criteria include guaranteed −12 V output tolerance (±5% over load/temperature), thermal shutdown protection, SOA-limited short-circuit current (400 mA at −30 V input), and compatibility with standard TO-220 footprint mounting in space-constrained through-hole designs.
Technical Context
This bipolar monolithic regulator uses internal current limiting, safe operating area (SOA) protection, and thermal shutdown circuitry to ensure robust operation under overload or high ambient temperature conditions. Its architecture provides fixed negative regulation without external components beyond input/output capacitors-CIN ≥ 2.2 μF (if remote from filter), COUT ≥ 1 μF (within 2 cm of pins).
Designed for use in −14.5 V to −30 V input ranges, it maintains regulated −12 V output across 5 mA to 350 mA loads and −20°C to +85°C ambient temperatures. Junction temperature is limited to +125°C under normal operation and +150°C absolute maximum, with thermal resistance Rth(J−C) = 7°C/W enabling heatsink-assisted power dissipation up to 15 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −12.0 V ±5% (−11.4 V to −12.6 V over 5–350 mA, −14.5 V ≤ VIN ≤ −30 V, 0°C ≤ TJ ≤ +125°C) |
| Max Output Current | 350 mA continuous; peak output current up to 1020 mA (transient, limited by SOA and thermal response) |
| Dropout Voltage | 1.1 V typical at 25°C - defines minimum VIN − VOUT differential required for regulation |
| Ripple Rejection | 64 dB typical at 120 Hz, −15 V ≤ VIN ≤ −25 V, IO = 100 mA - critical for rejecting rectified AC noise in unregulated supplies |
| Output Noise | 125–280 μVr.m.s. (10 Hz–100 kHz) - enables clean biasing of precision analog stages without added filtering |
| Quiescent Current | 4.4–6.0 mA at 25°C - sets no-load power loss and impacts standby efficiency in battery-backed systems |
| Thermal Shutdown | Activates at TJ ≥ +150°C - prevents permanent damage during sustained overload or inadequate heatsinking |
Pinout & Package
UPC79M12HF-1-AZ uses the 3-pin plastic SIP (MP-45G), also labeled "Isolated TO-220", with 2.54 mm lead pitch and body dimensions 17.0 × 10.0 × 8.9 mm. The package features electrically isolated tab (no internal connection to any pin), enabling direct heatsink mounting without insulation washers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference node for output voltage; must be low-impedance path to system ground to maintain regulation accuracy and noise immunity |
| 2 | INPUT | Negative input terminal - accepts unregulated −14.5 V to −30 V DC; requires ≥2.2 μF bypass capacitor if >2 cm from bulk filter |
| 3 | OUTPUT | Regulated −12 V source - requires ≥1 μF ceramic or tantalum capacitor placed within 2 cm of pin and GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed −12 V output | Eliminates need for external feedback resistors - simplifies layout and improves long-term voltage drift stability |
| On-chip SOA protection | Prevents destructive second breakdown during output short-circuit or high VIN−VOUT transients without external current-sense circuitry |
| Low output noise | 125–280 μVr.m.s. enables direct powering of low-noise op-amps and ADC reference buffers without post-regulation filtering |
| Thermal shutdown | Self-resetting protection that disables output above +150°C junction temperature - avoids catastrophic failure in sealed enclosures |
| Pb-free termination | AZ suffix denotes RoHS-compliant lead finish - supports compliance with EU Directive 2011/65/EU without process requalification |
Applications
| Industrial Process Controllers | Legacy Test Equipment |
|---|---|
Use Scenario: Powering dual-rail op-amps and analog front-ends in PLC I/O modules operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides stable −12 V bias for signal conditioning circuits, ensuring consistent common-mode range and offset performance across −20°C to +70°C. Use Value: Maintains ±5% output accuracy over full load/temperature range while surviving 30 V reverse-input transients common in relay-driven industrial backplanes. | Use Scenario: Supplying negative rails in benchtop oscilloscopes and spectrum analyzers where low-noise analog sections require clean DC references. IC Role / Device Role / Timing Role: Delivers regulated −12 V to active filters and mixer stages, minimizing hum and intermodulation distortion introduced by supply ripple. Use Value: 64 dB ripple rejection and sub-300 μVr.m.s. noise enable <100 nV/√Hz input-referred noise floors in high-resolution measurement paths. |
| Audio Signal Processing | Medical Diagnostic Instruments |
Use Scenario: Generating symmetrical ±12 V supplies for discrete transistor-based audio preamplifiers and equalizer circuits in studio-grade equipment. IC Role / Device Role / Timing Role: Supplies negative rail to Class-A amplifier stages, where quiescent current stability directly impacts harmonic distortion and channel balance. Use Value: 4.4–6.0 mA IBIAS with <0.4 mA variation over load ensures predictable idle current and thermal tracking between complementary gain devices. | Use Scenario: Biasing photodiode transimpedance amplifiers and sensor interface ICs in portable ultrasound and ECG units with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Provides isolated −12 V rail referenced to patient-isolated analog ground, preventing leakage current paths in Class I medical devices. Use Value: Electrically isolated TO-220 package allows direct heatsink attachment without additional insulation, reducing thermal resistance by ~3°C/W versus insulated mounts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7912CDT/NOPB | Higher quiescent current (6.5 mA typ), lower ripple rejection (50 dB), wider output tolerance (±10%), same −12 V nominal output | Less suitable for low-noise analog stages but widely available in SMD packages for new PCB designs | Select when cost, availability, or surface-mount assembly outweigh low-noise or tight-tolerance requirements |
| MC7912BD2TR4G | Lower max output current (1.5 A), higher dropout (2.0 V), tighter initial tolerance (±2%), same TO-220 package | Better for high-current applications but requires ≥16 V input for regulation - less efficient in low-differential systems | Select when higher output current capability and tighter initial accuracy are prioritized over noise and dropout performance |
Compared with LM7912CDT/NOPB, UPC79M12HF-1-AZ delivers superior noise and ripple rejection for precision analog use; compared with MC7912BD2TR4G, it offers lower dropout and better thermal efficiency in constrained input-voltage systems, though with reduced peak current headroom.
Availability
UPC79M12HF-1-AZ is available at Aetrix Electronics and suitable for industrial process controllers, legacy test equipment, and audio signal processing systems requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole regulators.
Supply support for UPC79M12HF-1-AZ 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 Corporation is a global semiconductor manufacturer formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog power devices, and automotive SoCs.
The UPC79Mxx Series was developed as a family of bipolar negative linear regulators targeting cost-sensitive, reliability-critical industrial and instrumentation applications where fixed-output simplicity and built-in protection outweigh programmability or ultra-low quiescent current needs.
FAQ
What is the maximum input voltage rating for the UPC79M12HF-1-AZ?
The UPC79M12HF-1-AZ has an absolute maximum input voltage rating of −35 V at TA = 25°C. Operation above this level risks permanent damage due to junction breakdown. For reliable continuous operation, the recommended input range is −14.5 V to −30 V per the datasheet's Recommended Operating Conditions table. This −30 V upper limit ensures margin against transients and maintains SOA integrity across the full temperature range. Always verify actual system rail voltages before final design sign-off.
Does the UPC79M12HF-1-AZ require external capacitors, and if so, what values are mandatory?
Yes, the UPC79M12HF-1-AZ requires both input and output capacitors for stable operation. A minimum 2.2 μF input capacitor (CIN) is required if the regulator is located more than 2 cm from the main power supply filter; otherwise, local bulk capacitance may suffice. A minimum 1 μF output capacitor (COUT) must be placed within 2 cm of the OUTPUT and GND pins - ceramic or tantalum types are preferred for low ESR. These values are specified in the Typical Connection diagram and are essential to prevent oscillation and ensure transient response integrity in the UPC79M12HF-1-AZ.
How does thermal shutdown behave in the UPC79M12HF-1-AZ during overload conditions?
In the UPC79M12HF-1-AZ, thermal shutdown activates when the junction temperature reaches approximately +150°C, disabling the output until the die cools below the hysteresis threshold (~135°C). This self-resetting protection is implemented via on-chip thermal sensing and does not require external circuitry. During sustained overload, the device cycles on/off - measurable as output voltage pulsing - which prevents permanent damage but indicates insufficient heatsinking or excessive power dissipation. The thermal resistance Rth(J−C) = 7°C/W means even modest heatsinks significantly extend safe operating time before shutdown triggers in the UPC79M12HF-1-AZ.
Can the UPC79M12HF-1-AZ be used in parallel to increase output current capacity?
No, the UPC79M12HF-1-AZ is not designed for parallel operation. Its output voltage tolerance (±5%) and lack of current-sharing features mean mismatched units will cause one device to dominate conduction, leading to thermal runaway and premature failure. Unlike modern regulators with current-limit matching or external share pins, the UPC79M12HF-1-AZ relies on individual SOA and thermal protection - attempting parallel use violates the Absolute Maximum Ratings and voids reliability guarantees. For higher current needs, select a single higher-capacity part such as MC7912BD2TR4G instead of paralleling UPC79M12HF-1-AZ units.
What is the significance of the "-AZ" suffix in UPC79M12HF-1-AZ?
The "-AZ" suffix in UPC79M12HF-1-AZ denotes compliance with the EU RoHS Directive 2011/65/EU, indicating that the device uses lead-free terminations (Pb-free external electrodes) and meets all restricted substance thresholds. This marking replaces older "-HF" variants that may contain lead in solderable finishes. The "-AZ" version is fully backward-compatible in form, fit, and function with non-RoHS predecessors but requires requalification of soldering profiles - particularly wave soldering temperature limits (≤260°C) and dwell time (≤10 s) - to avoid delamination or voiding in the UPC79M12HF-1-AZ package.
UPC79M12HF-1-AZ 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:
- -
UPC79M12HF-1-AZ FAQ
1.How can I place an order for UPC79M12HF-1-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for UPC79M12HF-1-AZ 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 UPC79M12HF-1-AZ reliable?
The price and inventory of UPC79M12HF-1-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPC79M12HF-1-AZ is usually 5 days.
3.What payment methods are accepted for UPC79M12HF-1-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPC79M12HF-1-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UPC79M12HF-1-AZ?
UPC79M12HF-1-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UPC79M12HF-1-AZ 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 UPC79M12HF-1-AZ?
For technical support, including UPC79M12HF-1-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPC79M12HF-1-AZ requirements.
6.How does Aetrix verify that UPC79M12HF-1-AZ is sourced from the original manufacturer or authorized distributors?
All UPC79M12HF-1-AZ 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 UPC79M12HF-1-AZ meets industry standards.
7.What is the process for return or replacement of UPC79M12HF-1-AZ?
All UPC79M12HF-1-AZ units undergo pre-shipment inspection (PSI). If there is an issue with UPC79M12HF-1-AZ, 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 UPC79M12HF-1-AZ part is unused and in its original packaging.
Return procedure for UPC79M12HF-1-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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