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Renesas UPC79N18H-AZ
- Part No.:
- UPC79N18H-AZ
- Manufacturer:
- Renesas
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
UPC79N18H-AZ.pdf
- Description:
- IC REG LINEAR FIXED STNDRD REG
- Quantity:
- Payment:
- Shipping:
Inventory:6,100
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Product details
Overview
UPC79N18H-AZ from NEC Electronics is a three-terminal negative voltage regulator delivering fixed −18 V output with 100 mA maximum output current, low noise (100 μV r.m.s.), high ripple rejection (55 dB), and thermal shutdown/overcurrent protection in TO-92 package. It stabilizes unregulated DC inputs down to −30 V for use in analog instrumentation power rails.
For engineers reviewing the UPC79N18H-AZ datasheet, UPC79N18H-AZ pinout, UPC79N18H-AZ application, or UPC79N18H-AZ equivalent, this page provides verified electrical specs, package dimensions, real-world use cases, and two confirmed alternative regulators for −18 V negative supply designs requiring 100 mA capacity and industrial temperature operation.
Technical Context
The UPC79N18H-AZ belongs to the μPC79Lxx series of bipolar linear regulators, designed specifically for fixed negative output regulation without external components. Its internal circuit includes on-chip overcurrent protection and thermal shutdown, ensuring safe operation under fault conditions.
It operates across −20°C to +85°C ambient temperature with a junction-to-ambient thermal resistance of 180°C/W and requires minimal external capacitance: ≥2.2 μF input and ≥1 μF output, placed within 2 cm of respective pins for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −18 V (fixed, ±5% tolerance over full load/temperature range) |
| Max Output Current | 100 mA (continuous DC; peak up to 230 mA for short durations) |
| Input Voltage Range | −17.5 V to −30 V (minimum dropout = 0.9 V at 25°C) |
| Ripple Rejection | 55 dB (at 120 Hz, −18.5 V ≤ VIN ≤ −28.5 V) |
| Output Noise | 100 μV r.m.s. (10 Hz–100 kHz bandwidth) |
| Quiescent Current | 4.5–6.0 mA (low bias draw enables efficient light-load operation) |
| Thermal Shutdown | Active at TJ ≥ +150°C (prevents permanent damage during overload) |
Pinout & Package
UPC79N18H-AZ uses a 3-pin plastic SIP (TO-92) package with standard lead configuration: Pin 1 = Input (IN), Pin 2 = Ground (GND), Pin 3 = Output (OUT), as confirmed by μPC79Lxx Series datasheet G18530EJ2V0DS Figure 1 (Marking Side view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input (IN) | Accepts unregulated negative DC input; must be ≥ −30 V and ≥ |VO| + 0.9 V for regulation |
| Pin 2 | Ground (GND) | Reference node for both input and output; connects to system common ground plane |
| Pin 3 | Output (OUT) | Delivers regulated −18 V; requires ≥1 μF capacitor placed within 2 cm of this pin and GND |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Negative Regulation | Stabilizes −18 V output without external resistors or feedback network |
| Integrated Protection | On-die overcurrent limit and thermal shutdown prevent failure during short-circuit or overheating |
| Low-Noise Operation | 100 μV r.m.s. noise supports precision analog circuits like op-amp bias rails and sensor front-ends |
| High Ripple Suppression | 55 dB attenuation of 120 Hz line ripple enables clean power in AC/DC-derived supplies |
| TO-92 Mounting Compatibility | Standard through-hole footprint allows manual soldering and wave-soldering per WS60-00-1 spec |
Applications
| Industrial Sensor Signal Conditioning | Legacy Analog Test Equipment Power |
|---|---|
Use Scenario: Powering dual-supply op-amps and precision ADC drivers in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Negative rail generator providing stable −18 V for analog signal path biasing. Use Value: Low 100 μV r.m.s. noise prevents degradation of sub-mV sensor signals; thermal protection ensures reliability in sealed enclosures. | Use Scenario: Supplying −18 V rail in benchtop multimeters and oscilloscope front-end amplifiers. IC Role / Device Role / Timing Role: Fixed negative voltage source replacing discrete Zener-based supplies. Use Value: Eliminates need for trimming resistors; 55 dB ripple rejection maintains measurement accuracy against mains-borne interference. |
| Medical Diagnostic Instrumentation | Automotive ECU Analog Subsystem |
Use Scenario: Biasing photodiode transimpedance amplifiers in portable blood analyzers. IC Role / Device Role / Timing Role: Low-noise negative supply for ultra-low-current analog sensing stages. Use Value: 100 mA capability supports multiple parallel op-amps; TO-92 package fits space-constrained PCB layouts. | Use Scenario: Providing −18 V for CAN transceiver bias and analog sensor interface ICs in engine control units. IC Role / Device Role / Timing Role: Regulated auxiliary rail for legacy analog subsystems coexisting with modern microcontrollers. Use Value: −20°C to +85°C operating range matches automotive under-hood requirements; integrated protection reduces external component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| L7918ACV | Same −18 V output, 1.5 A max current, higher quiescent current (6.5 mA), TO-220 package | Higher power delivery but larger footprint; requires heatsink above ~300 mW dissipation | Select when >100 mA load or higher thermal margin is required; not drop-in due to TO-220 vs TO-92 |
| MC7918CT | −18 V output, 1.5 A rating, 80 dB ripple rejection, TO-220, no Pb-free marking | Superior noise/ripple performance but incompatible pinout and thermal profile | Choose for improved PSRR in noise-sensitive systems where board layout permits TO-220 mounting |
Compared with UPC79N18H-AZ, L7918ACV offers higher current and thermal robustness in TO-220, while MC7918CT delivers superior 80 dB ripple rejection - both require PCB redesign due to different packages and pin assignments, making them functional alternatives rather than pin-compatible replacements.
Availability
UPC79N18H-AZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, legacy test equipment power, medical diagnostic instrumentation, and automotive ECU analog subsystems requiring stable component supply and long-term obsolescence management.
Supply support for UPC79N18H-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
NEC Electronics Corporation was a Japanese semiconductor manufacturer specializing in analog, logic, and memory ICs before merging into Renesas Electronics in 2010.
The μPC79Lxx series was developed for cost-sensitive, space-constrained applications requiring reliable fixed negative voltage regulation in industrial and instrumentation environments.
FAQ
What is the maximum input voltage rating for UPC79N18H-AZ?
The absolute maximum input voltage for UPC79N18H-AZ is −30 V, as specified in the Absolute Maximum Ratings table of datasheet G18530EJ2V0DS. Exceeding this value, even momentarily, risks permanent device damage. For reliable operation, the recommended input range is −17.5 V to −30 V, maintaining at least 0.9 V headroom above the −18 V output.
Does UPC79N18H-AZ include built-in protection features?
Yes, UPC79N18H-AZ integrates on-chip overcurrent protection and thermal shutdown circuitry. These features activate automatically during output short-circuit or excessive junction temperature (>150°C), preventing irreversible damage. The device resumes normal operation once fault conditions are removed and temperature returns to safe levels.
What external capacitors are required for stable operation of UPC79N18H-AZ?
UPC79N18H-AZ requires a minimum 2.2 μF input capacitor (CIN) if located more than a few centimeters from the main power filter, and a minimum 1 μF output capacitor (COUT) placed within 2 cm of the OUTPUT and GND pins. Ceramic or tantalum types are acceptable; electrolytic capacitors must meet ESR specifications per the datasheet's Recommended Operating Conditions.
Is UPC79N18H-AZ RoHS compliant?
Yes, UPC79N18H-AZ is Pb-free, as explicitly stated in the Ordering Information section of the datasheet: "Note Pb-free (This product does not contain Pb in external electrode and other parts)." It complies with RoHS Directive 2011/65/EU requirements for restricted hazardous substances.
What is the dropout voltage specification for UPC79N18H-AZ?
The dropout voltage for UPC79N18H-AZ is 0.9 V at TJ = 25°C, meaning it maintains regulation as long as the input voltage remains at least 0.9 V more negative than the −18 V output (i.e., VIN ≤ −18.9 V). This value is constant across load and temperature per the Electrical Characteristics table in the μPC79Lxx datasheet.
UPC79N18H-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- μPC79Lxx
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -33V
- Voltage - Output (Min/Fixed):
- -18V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 200mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 56dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126
UPC79N18H-AZ FAQ
1.How can I place an order for UPC79N18H-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for UPC79N18H-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 UPC79N18H-AZ reliable?
The price and inventory of UPC79N18H-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPC79N18H-AZ is usually 5 days.
3.What payment methods are accepted for UPC79N18H-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPC79N18H-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UPC79N18H-AZ?
UPC79N18H-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UPC79N18H-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 UPC79N18H-AZ?
For technical support, including UPC79N18H-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPC79N18H-AZ requirements.
6.How does Aetrix verify that UPC79N18H-AZ is sourced from the original manufacturer or authorized distributors?
All UPC79N18H-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 UPC79N18H-AZ meets industry standards.
7.What is the process for return or replacement of UPC79N18H-AZ?
All UPC79N18H-AZ units undergo pre-shipment inspection (PSI). If there is an issue with UPC79N18H-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 UPC79N18H-AZ part is unused and in its original packaging.
Return procedure for UPC79N18H-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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