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Renesas UPC79N08H-AZ
- Part No.:
- UPC79N08H-AZ
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
UPC79N08H-AZ.pdf
- Description:
- IC REG LINEAR FIXED STNDRD REG
- Quantity:
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Inventory:2,170
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Product details
Overview
UPC79N08H-AZ from NEC Electronics is a three-terminal negative fixed-voltage linear regulator delivering −8 V output with 100 mA maximum output current, 56 μVr.m.s. output noise, and 75 dB ripple rejection at 120 Hz. It features on-chip overcurrent protection and thermal shutdown, and is used in low-noise analog supply rails for op-amp biasing, sensor signal conditioning, and dual-rail instrumentation circuits.
For engineers reviewing the UPC79N08H-AZ datasheet, UPC79N08H-AZ pinout, UPC79N08H-AZ application, or UPC79N08H-AZ equivalent, key selection criteria include guaranteed −8 V output tolerance (±0.4 V), dropout voltage of 0.9 V at 25°C, TO-92 package thermal resistance (180°C/W), and operating junction temperature range up to +125°C under load.
Technical Context
The UPC79N08H-AZ operates as a monolithic bipolar linear regulator with emitter-follower pass transistor topology, requiring no external compensation. Its internal reference and error amplifier maintain regulation across input voltages from −10.5 V to −23 V and output loads from 1 mA to 100 mA.
It integrates thermal shutdown triggered at TJ ≥ +150°C and foldback current limiting that reduces short-circuit current to 75 mA at VIN = −23 V, ensuring safe operation during fault conditions without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −8.0 V ±0.4 V (guaranteed over line/load/temperature) |
| Max Output Current | 100 mA continuous (supports rail-splitting for ±5 V systems) |
| Dropout Voltage | 0.9 V at 25°C (enables use with −9 V input for stable −8 V rail) |
| Ripple Rejection | 75 dB at 120 Hz (suppresses rectifier ripple in linear power supplies) |
| Output Noise | 56 μVr.m.s. (10 Hz–100 kHz; critical for low-noise audio/sensor front-ends) |
| Quiescent Current | 4.3–6.0 mA (low standby draw for battery-backed subsystems) |
| Thermal Shutdown | Active at TJ ≥ +150°C (prevents permanent damage during overload) |
Pinout & Package
UPC79N08H-AZ is housed in a 3-pin plastic SIP (TO-92) package with standard lead spacing (2.54 mm), 5.0 mm body height, and 15.0 mm overall length. The package is Pb-free and rated for −20°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated negative input | Accepts −10.5 V to −23 V DC; must be ≥0.9 V more negative than output |
| 2 (Ground) | Common reference node | Return path for load current and quiescent bias; requires low-impedance layout |
| 3 (Output) | Regulated negative output | Delivers stable −8 V to load; capacitor COUT (≥1 μF) must be placed ≤2 cm from this pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed −8 V output | Eliminates external resistor network; simplifies design of dual-supply analog stages |
| On-chip thermal shutdown | Automatically disables output above +150°C junction temperature-no external thermal sensor needed |
| Low 56 μVr.m.s. noise | Enables direct powering of precision op-amps and ADC reference buffers without additional filtering |
| 75 dB ripple rejection | Reduces 120 Hz full-wave rectifier ripple by >5,600×-critical for clean analog supply rails |
| TO-92 package compatibility | Supports manual prototyping and legacy through-hole assembly; compatible with standard wave-solder profiles |
Applications
| Industrial Sensor Signal Conditioning | Audio Pre-amplifier Bias Supply |
|---|---|
Use Scenario: Powering low-noise instrumentation amplifiers in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Negative rail generator for dual-supply op-amps interfacing with bridge sensors. Use Value: 56 μVr.m.s. noise ensures <0.001% added noise floor degradation in 24-bit sigma-delta ADC front-ends. | Use Scenario: Providing clean −8 V bias to JFET-input op-amps in microphone preamplifiers. IC Role / Device Role / Timing Role: Low-noise negative voltage source decoupled from noisy digital supply rails. Use Value: 75 dB ripple rejection prevents audible 120 Hz hum modulation in high-gain (>60 dB) audio paths. |
| Dual-Rail Microcontroller Peripherals | Legacy Industrial Control I/O Modules |
Use Scenario: Generating symmetric ±8 V rails for analog output DACs and motor driver gate bias in PLC analog output cards. IC Role / Device Role / Timing Role: Fixed negative regulator paired with UPC78N08H-AZ for rail symmetry. Use Value: Guaranteed −8.0 V ±0.4 V output enables precise 16-bit DAC full-scale accuracy without calibration. | Use Scenario: Replacing obsolete −8 V regulators in field-installed programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for legacy μPC79L08J-A in repair and spare parts programs. Use Value: Identical TO-92 footprint and electrical specs ensure zero PCB rework during maintenance upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative fixed-voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7908ACZ | Higher quiescent current (6.5 mA typ), lower ripple rejection (70 dB), same −8 V output tolerance | Wider industrial temp range (−40°C to +125°C) but higher noise (80 μVr.m.s.) | Prefer when extended temperature operation is required and noise is less critical |
| MC79L08ACP | Same TO-92 package, identical −8 V output spec, but lower max current (100 mA vs 100 mA), higher dropout (1.7 V) | Compatible in space-constrained designs but requires ≥−9.7 V input for regulation | Choose only if LM79xx family sourcing is standardized and input headroom allows |
Compared with LM7908ACZ and MC79L08ACP, UPC79N08H-AZ offers the lowest output noise (56 μVr.m.s.) and best ripple rejection (75 dB) among TO-92 −8 V regulators, making it optimal for precision analog signal chains where supply-induced distortion must be minimized.
Availability
UPC79N08H-AZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, audio preamplifier biasing, and dual-rail microcontroller peripherals requiring stable component supply, long-term obsolescence management, and traceable Pb-free sourcing.
Supply support for UPC79N08H-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 (now part of Renesas Electronics) was a Japanese semiconductor manufacturer specializing in analog, logic, and memory ICs for industrial and consumer applications.
The μPC79Lxx Series was designed specifically as cost-effective, low-noise negative linear regulators for analog subsystems in measurement equipment, audio devices, and legacy control hardware.
FAQ
What is the guaranteed output voltage tolerance for UPC79N08H-AZ across temperature and load?
The UPC79N08H-AZ guarantees −8.0 V output within ±0.4 V (i.e., −7.6 V to −8.4 V) over input voltage range −10.5 V to −23 V, load current 1 mA to 40 mA, and junction temperature 0°C to +125°C. At 25°C with 40 mA load, typical output is −8.0 V with ±0.3 V variation.
Does UPC79N08H-AZ require an input bypass capacitor, and if so, what value is recommended?
Yes - UPC79N08H-AZ requires a minimum 2.2 μF input capacitor (CIN) when located more than a few centimeters from the main power supply filter. This stabilizes the input against source impedance and prevents oscillation under transient load changes. Ceramic or tantalum types are acceptable; aluminum electrolytic is also commonly used.
Can UPC79N08H-AZ be used in parallel to increase output current capacity?
No - UPC79N08H-AZ is not designed for parallel operation. Its output voltage tolerance and thermal characteristics prevent balanced current sharing. Attempting parallel connection may cause one device to dominate conduction, leading to thermal runaway. For >100 mA, select a higher-current regulator such as UPC79M08H-AZ (500 mA).
What is the maximum allowable input voltage for UPC79N08H-AZ, and does it vary by output version?
The absolute maximum input voltage for UPC79N08H-AZ is −23 V. This is specific to the −8 V version; −5 V variants (e.g., UPC79N05H-AZ) are rated to −20 V, while −12 V and −15 V versions support up to −27 V and −30 V respectively per the datasheet's note on VIN rating differentiation.
Is UPC79N08H-AZ RoHS-compliant and Pb-free?
Yes - UPC79N08H-AZ is Pb-free, with no lead content in external electrodes or other parts, as explicitly stated in the "Note" section of the ordering information table in the official NEC datasheet G18530EJ2V0DS. It complies with RoHS Directive 2011/65/EU requirements.
UPC79N08H-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:
- -
UPC79N08H-AZ FAQ
1.How can I place an order for UPC79N08H-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for UPC79N08H-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 UPC79N08H-AZ reliable?
The price and inventory of UPC79N08H-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPC79N08H-AZ is usually 5 days.
3.What payment methods are accepted for UPC79N08H-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPC79N08H-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UPC79N08H-AZ?
UPC79N08H-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UPC79N08H-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 UPC79N08H-AZ?
For technical support, including UPC79N08H-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPC79N08H-AZ requirements.
6.How does Aetrix verify that UPC79N08H-AZ is sourced from the original manufacturer or authorized distributors?
All UPC79N08H-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 UPC79N08H-AZ meets industry standards.
7.What is the process for return or replacement of UPC79N08H-AZ?
All UPC79N08H-AZ units undergo pre-shipment inspection (PSI). If there is an issue with UPC79N08H-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 UPC79N08H-AZ part is unused and in its original packaging.
Return procedure for UPC79N08H-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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