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onsemi MC79L05ACPRM
- Part No.:
- MC79L05ACPRM
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MC79L05ACPRM.pdf
- Description:
- IC REG LINEAR -5V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,781
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Product details
Overview
MC79L05ACPRM from ON Semiconductor is a three-terminal, fixed-output −5.0 V negative linear voltage regulator delivering up to 100 mA output current with ±2% output voltage tolerance at +25°C, 1.7 V dropout voltage at 40 mA, and integrated thermal shutdown and short-circuit current limiting. It operates across 0°C to +125°C junction temperature range and is used for on-card regulation in analog signal chains, sensor biasing, and dual-rail op-amp supplies.
For engineers reviewing the MC79L05ACPRM datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed −5.0 V output stability under 100 mA load, TO-92 package compatibility with legacy through-hole layouts, thermal protection behavior at elevated ambient temperatures, and ripple rejection of 41 dB at 120 Hz.
Technical Context
The MC79L05ACPRM implements a monolithic bipolar transistor-based series pass architecture with internal bandgap reference, error amplifier, and current-limiting transistor. Its thermal shutdown activates at +150°C junction temperature, and short-circuit protection holds output current ≤6.5 mA at +25°C.
It requires no external compensation components in standard configurations but specifies 0.33 µF input and 0.1 µF output ceramic or tantalum bypass capacitors for stability with long trace lengths or large capacitive loads. Input voltage range is −7.0 V to −20 V for regulated operation, with absolute maximum rating of −30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −4.8 V to −5.2 V at +25°C - ensures stable −5.0 V rail for TTL/CMOS logic interfaces and analog circuitry requiring precise negative bias. |
| Output Current | 100 mA maximum - supports low-power analog subsystems including op-amps, ADC references, and discrete sensor front-ends. |
| Dropout Voltage | 1.7 V at 40 mA - defines minimum input-to-output differential needed to maintain regulation; enables use with −6.7 V minimum input in −5 V systems. |
| Ripple Rejection | 41 dB at 120 Hz - suppresses rectified AC line noise in linear power supplies feeding sensitive analog stages. |
| Load Regulation | 30 mV (1–40 mA) - guarantees output deviation remains within ±0.6% across typical operating current range. |
| Input Voltage Range | −7.0 V to −20 V (regulated), −30 V absolute max - sets compatible transformer-secondary or pre-regulator stage design boundaries. |
| Thermal Shutdown Threshold | +150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking conditions. |
Pinout & Package
MC79L05ACPRM is supplied in TO-92 package (Case 29), with straight leads, Pb-free finish, and tape-and-ammo box packaging. The package has 3 active terminals and is rated for 160°C/W junction-to-ambient thermal resistance at TA = +25°C with no heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Common reference node for input and output; must be low-impedance path to minimize regulation error and noise coupling. |
| 2 | Input | Negative input terminal accepting unregulated −7 V to −20 V supply; requires 0.33 µF bypass capacitor near pin for high-frequency stability. |
| 3 | Output | Regulated −5.0 V source; requires 0.1 µF output capacitor to improve transient response and prevent oscillation under dynamic loads. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables minimal BOM count and PCB area in space-constrained designs such as portable instrumentation and sensor modules. |
| Internal short-circuit current limiting | Limits fault current to ≤6.5 mA at +25°C, protecting upstream supply and preventing catastrophic failure during output shorts. |
| Internal thermal overload protection | Shuts down regulator when junction reaches +150°C, allowing safe cooldown before automatic recovery-no latch-up or manual reset needed. |
| Pb-free TO-92 packaging | Complies with RoHS Directive 2011/65/EU and supports lead-free reflow soldering processes without compromising thermal performance. |
| −40°C to +125°C automotive-grade variants available | MC79L05ABxxx versions support extended temperature operation; MC79L05ACPRM is rated for 0°C to +125°C, suitable for industrial control and telecom equipment. |
Applications
| Industrial Sensor Signal Conditioning | Dual-Rail Op-Amp Power Supply |
|---|---|
|
Use Scenario: Providing stable negative bias for precision instrumentation amplifiers measuring thermocouple or strain gauge outputs in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Negative voltage regulator supplying −5.0 V reference rail to op-amp dual-supply inputs and ADC reference buffers. Use Value: Maintains <±2% output accuracy over 0–125°C, enabling sub-12-bit measurement fidelity without external trimming or calibration. |
Use Scenario: Powering rail-to-rail op-amps in audio preamplifier stages where symmetric ±5 V rails reduce even-order harmonic distortion. IC Role / Device Role / Timing Role: Fixed negative regulator paired with MC78L05AC to generate matched ±5 V supplies from single unregulated DC input. Use Value: Delivers 100 mA with 41 dB ripple rejection at 120 Hz, suppressing mains-borne noise that would otherwise modulate audio signal paths. |
| Legacy Embedded System Board-Level Regulation | Analog Front-End Biasing in Data Acquisition Units |
|
Use Scenario: On-card regulation for vintage microcontroller-based controllers using discrete transistor logic and analog comparators requiring clean −5 V. IC Role / Device Role / Timing Role: Local negative voltage source replacing obsolete resistor-Zener networks to improve efficiency and thermal reliability. Use Value: Eliminates need for heat-sinking resistors and reduces board-level power dissipation by >40% versus Zener-based solutions at 40 mA load. |
Use Scenario: Biasing photodiode transimpedance amplifiers and programmable gain instrumentation amplifiers in medical-grade ECG front-ends. IC Role / Device Role / Timing Role: Low-noise (40 µV RMS, 10 Hz–100 kHz) negative supply stabilizing reference nodes for high-gain analog signal paths. Use Value: Output noise floor of 40 µV RMS avoids degrading SNR in 16-bit+ data acquisition systems operating at sampling rates up to 100 kSPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative fixed-voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM79L05ACZ | Same −5.0 V output, 100 mA rating, TO-92 package, but higher dropout (2.0 V) and lower ripple rejection (35 dB). | Less suitable for low-input-voltage systems or high-noise environments where 41 dB rejection is critical. | Select MC79L05ACPRM when tighter output tolerance (±2% vs ±5%), lower dropout, or higher ripple rejection is required. |
| MC79L05ACP | Identical electrical specs and TO-92 package, but uses bulk-pack (not tape-and-ammo) and lacks "RM" suffix indicating ammo-box shipping format. | No functional difference; differs only in packaging configuration and reel orientation compliance for automated assembly. | Choose MC79L05ACPRM for SMT-compatible tape-and-ammo delivery supporting high-volume pick-and-place placement. |
Compared with LM79L05ACZ, MC79L05ACPRM delivers tighter output voltage accuracy and superior noise immunity; compared with MC79L05ACP, it offers optimized logistics for automated manufacturing while retaining identical regulation performance and thermal behavior.
Availability
MC79L05ACPRM is available at Aetrix Electronics and suitable for industrial sensor conditioning, dual-rail op-amp power supplies, and legacy embedded system board-level regulation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MC79L05ACPRM 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC79L00A Series was designed to replace discrete Zener-resistor regulators in cost-sensitive, low-current applications requiring ruggedness, simplicity, and guaranteed thermal/current protection-targeting industrial controls, instrumentation, and legacy system upgrades.
FAQ
What is the maximum input voltage rating for MC79L05ACPRM?
The absolute maximum input voltage for MC79L05ACPRM is −30 V DC. Operation above this level risks permanent device damage. For reliable regulation, the input must remain between −7.0 V and −20 V DC under normal conditions, with 1.7 V dropout margin ensuring −5.0 V output stability. Exceeding −30 V violates the Absolute Maximum Ratings table and may cause junction breakdown or latent reliability degradation.
Does MC79L05ACPRM require external capacitors to operate stably?
MC79L05ACPRM does not require external capacitors for basic regulation, but ON Semiconductor recommends a 0.33 µF input capacitor placed directly across pins 2 (Input) and 1 (Ground), and a 0.1 µF output capacitor across pins 3 (Output) and 1 (Ground). These capacitors ensure stability with long input traces or large capacitive loads, suppress high-frequency noise, and improve transient response-especially critical in analog signal chains and precision sensor interfaces.
What is the thermal shutdown behavior of MC79L05ACPRM?
MC79L05ACPRM activates internal thermal shutdown at +150°C junction temperature, halting output conduction until the die cools below the hysteresis threshold (~135°C). This protection is fully automatic and non-latching-regulation resumes without external intervention once temperature falls. The TO-92 package's 160°C/W junction-to-ambient thermal resistance means continuous 100 mA operation at +70°C ambient requires careful layout and airflow to avoid repeated cycling.
How does MC79L05ACPRM compare to MC79L05ACP in terms of electrical performance?
MC79L05ACPRM and MC79L05ACP share identical electrical specifications: −5.0 V output (±2%), 100 mA current capability, 1.7 V dropout, 41 dB ripple rejection, and thermal/current protection thresholds. The "RM" suffix denotes tape-and-ammo box packaging optimized for automated SMT placement, whereas MC79L05ACP uses bulk packaging. No electrical or thermal performance differences exist between the two part numbers.
Can MC79L05ACPRM be used in automotive applications?
MC79L05ACPRM is rated for 0°C to +125°C junction temperature and is intended for industrial and commercial applications. For automotive use, ON Semiconductor offers the MC79L05ABxxx family (e.g., MC79L05ABPRAG), qualified to −40°C to +125°C with additional AEC-Q100 stress testing and automotive-specific screening. Using MC79L05ACPRM in automotive environments may violate temperature derating requirements and void warranty or reliability commitments.
MC79L05ACPRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -30V
- Voltage - Output (Min/Fixed):
- -5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.7V @ 40mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 49dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
MC79L05ACPRM FAQ
1.How can I place an order for MC79L05ACPRM through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79L05ACPRM 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 MC79L05ACPRM reliable?
The price and inventory of MC79L05ACPRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79L05ACPRM is usually 5 days.
3.What payment methods are accepted for MC79L05ACPRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79L05ACPRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79L05ACPRM?
MC79L05ACPRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79L05ACPRM 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 MC79L05ACPRM?
For technical support, including MC79L05ACPRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79L05ACPRM requirements.
6.How does Aetrix verify that MC79L05ACPRM is sourced from the original manufacturer or authorized distributors?
All MC79L05ACPRM 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 MC79L05ACPRM meets industry standards.
7.What is the process for return or replacement of MC79L05ACPRM?
All MC79L05ACPRM units undergo pre-shipment inspection (PSI). If there is an issue with MC79L05ACPRM, 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 MC79L05ACPRM part is unused and in its original packaging.
Return procedure for MC79L05ACPRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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