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onsemi MC79M05BTG
- Part No.:
- MC79M05BTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC79M05BTG.pdf
- Description:
- IC REG LINEAR -5V 500MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
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Product details
Overview
MC79M05BTG from onsemi is a fixed-output negative voltage regulator delivering −5.0 V at up to 500 mA, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It uses a TO-220-3 package with Pb-free finish and operates across −40 °C to +125 °C, commonly deployed in industrial power supplies and analog signal conditioning circuits requiring stable negative bias.
For engineers reviewing the MC79M05BTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, package mechanicals, real-world use scenarios, and validated alternative options for design-in and supply continuity planning.
Technical Context
The MC79M05BTG implements a monolithic bipolar linear regulator architecture with built-in protection circuitry including foldback current limiting and thermal foldback. Its output voltage is trimmed during production to ±4.0% tolerance over temperature and load.
It requires no external components for basic operation but benefits from input (0.33 µF) and output (1.0 µF) capacitors to improve ripple rejection (≥54 dB at 120 Hz) and transient response. Dropout voltage remains ≤1.1 Vdc at 500 mA and 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5.0 V ±4.0% (guaranteed over −40 °C to +125 °C, 5–500 mA load) |
| Maximum Output Current | 500 mA (continuous, with adequate heatsinking) |
| Input Voltage Range | −35 Vdc maximum; minimum input must be ≥−6.1 Vdc to maintain regulation under full load and ripple |
| Dropout Voltage | ≤1.1 Vdc at 500 mA and 25 °C (defines minimum headroom between input and output) |
| Ripple Rejection | ≥54 dB at 120 Hz (enables effective filtering of rectified AC-derived inputs) |
| Thermal Resistance | Junction-to-case = 5.0 °C/W (supports high-power dissipation when mounted to heatsink) |
| Operating Temperature | −40 °C to +125 °C junction range (validated for extended industrial environments) |
Pinout & Package
MC79M05BTG uses the TO-220-3 (Case 221AB) package: a through-hole, thermally enhanced plastic package with three leads and an electrically isolated metal tab for heatsink attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground (GND) | Reference node for internal biasing and feedback; common return path for input and output circuits |
| 2 | Input (VI) | Negative input terminal; accepts unregulated negative DC voltage (e.g., −7 V to −25 V) |
| 3 | Output (VO) | Regulated −5.0 V output; supplies downstream analog or logic circuitry requiring stable negative rail |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables minimal BOM count and compact PCB layout for basic regulation without external pass transistors or compensation networks |
| Internal thermal overload protection | Shuts down output when junction temperature exceeds safe limit, preventing permanent damage during sustained overload or poor heatsinking |
| Internal short-circuit current limiting | Clamps output current to safe level during fault conditions, protecting both regulator and load from destructive currents |
| Safe-area compensated output transistor | Prevents secondary breakdown under high-voltage/high-current stress, improving reliability in transient-heavy applications |
| Pb-free TO-220-3 package | Complies with RoHS Directive 2011/65/EU; compatible with standard leaded and lead-free solder reflow profiles |
Applications
| Industrial Power Supply | Analog Signal Conditioning |
|---|---|
Use Scenario: Provides clean −5 V rail for op-amp biasing and sensor front-end circuitry in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Negative linear voltage regulator supplying stable reference voltage to precision instrumentation amplifiers. Use Value: Maintains <±100 mV load regulation across 5–500 mA, ensuring consistent gain and offset performance despite varying sensor channel count. | Use Scenario: Powers dual-supply op-amps and ADC drivers in data acquisition modules interfacing with ±10 V industrial sensors. IC Role / Device Role / Timing Role: Fixed negative rail generator enabling symmetrical signal swing and minimizing common-mode error. Use Value: Delivers ≤40 µV RMS output noise (10 Hz–100 kHz), preserving SNR in 16-bit+ measurement systems. |
| Legacy System Replacement | Embedded Control Subsystem |
Use Scenario: Direct replacement for obsolete −5 V regulators in field-deployed medical diagnostic equipment requiring long-term component availability. IC Role / Device Role / Timing Role: Pin-compatible drop-in regulator supporting backward-compatible board revisions without layout change. Use Value: Matches legacy TO-220 footprint and electrical behavior (including dropout and thermal resistance), reducing qualification time. | Use Scenario: Supplies −5 V to microcontroller I/O buffers and level-shifting interfaces in motor control gate driver boards. IC Role / Device Role / Timing Role: Local negative rail generator decoupling digital noise from analog sensing paths. Use Value: Achieves ≥66 dB typical ripple rejection, suppressing switching noise from adjacent 48 V DC-DC converters. |
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 |
|---|---|---|---|
| LM7905CT | Same −5 V output, ±2% initial tolerance (tighter than MC79M05BTG's ±4%), but higher dropout (1.3 V) and lower max current (1.5 A vs. 500 mA) | Preferred where tighter output accuracy is critical and higher current capability is needed; less suitable for space-constrained layouts due to larger TO-220 thermal pad requirements | Select LM7905CT when ±2% output tolerance and 1.5 A drive are required; verify heatsink adequacy for higher power dissipation |
| MC79L05ACDR2G | Lower current rating (100 mA), SOIC-8 surface-mount package, wider input range (−35 V), same −5 V output | Suitable for low-power, space-sensitive designs; lacks thermal performance of TO-220 package and cannot support >100 mA continuous loads | Choose MC79L05ACDR2G only for low-current auxiliary rails where PCB area is constrained and thermal load is minimal |
Compared with LM7905CT and MC79L05ACDR2G, the MC79M05BTG balances moderate current delivery (500 mA), robust thermal performance (5.0 °C/W θJC), and industrial temperature range (−40 °C to +125 °C), making it optimal for mid-power embedded systems where reliability under thermal stress is prioritized over ultra-tight tolerance or miniaturization.
Availability
MC79M05BTG is available at Aetrix Electronics and suitable for industrial power supplies, analog signal conditioning, legacy system replacement, and embedded control subsystems requiring stable component supply and long-term lifecycle support.
Supply support for MC79M05BTG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC79M00 series was designed specifically for rugged, cost-effective negative voltage regulation in industrial and embedded systems where thermal resilience, fault protection, and wide operating temperature range are essential.
FAQ
What is the guaranteed output voltage tolerance for MC79M05BTG over its full operating temperature range?
The MC79M05BTG has a guaranteed output voltage tolerance of ±4.0% over its full operating junction temperature range of −40 °C to +125 °C, as specified in the official onsemi datasheet revision 16. This tolerance applies under all rated load and line conditions, and the device is tested to ensure compliance across temperature extremes.
Can MC79M05BTG be used without external capacitors?
Yes, MC79M05BTG can operate without external capacitors for basic functionality, as stated in its "No External Components Required" feature. However, adding a 0.33 µF input capacitor (if located remotely from the filter) and a 1.0 µF output capacitor significantly improves stability, transient response, and ripple rejection-especially critical in noisy industrial environments where the MC79M05BTG is commonly deployed.
What is the maximum power dissipation capability of MC79M05BTG at 25 °C ambient with a standard heatsink?
MC79M05BTG has internally limited power dissipation, but its thermal resistance junction-to-case is 5.0 °C/W. With a typical heatsink providing ~10 °C/W junction-to-ambient, the MC79M05BTG can safely dissipate approximately 10 W at 25 °C ambient-supporting 500 mA output at up to 20 V input-to-output differential. Derating is required above 25 °C ambient per the datasheet thermal curves.
Is MC79M05BTG pin-compatible with older non-Pb-free versions like MC79M05BT?
Yes, MC79M05BTG is mechanically and electrically pin-compatible with MC79M05BT. Both use the identical TO-220-3 (Case 221AB) package, share identical pinout (Pin 1 = GND, Pin 2 = Input, Pin 3 = Output), and meet the same electrical specifications. The "G" suffix denotes Pb-free finish, with no functional or layout impact-making MC79M05BTG a direct drop-in replacement.
Does MC79M05BTG include reverse-polarity protection?
No, MC79M05BTG does not include integrated reverse-polarity protection. The datasheet recommends adding an external Schottky diode (e.g., MBRS140) from output to input to prevent damage during output polarity reversal or fast input shutdown. This external protection is necessary in systems where input power sequencing or fault conditions could expose the regulator to reverse voltage stress.
MC79M05BTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 500mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 66dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC79M05BTG FAQ
1.How can I place an order for MC79M05BTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79M05BTG 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 MC79M05BTG reliable?
The price and inventory of MC79M05BTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79M05BTG is usually 5 days.
3.What payment methods are accepted for MC79M05BTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79M05BTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79M05BTG?
MC79M05BTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79M05BTG 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 MC79M05BTG?
For technical support, including MC79M05BTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79M05BTG requirements.
6.How does Aetrix verify that MC79M05BTG is sourced from the original manufacturer or authorized distributors?
All MC79M05BTG 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 MC79M05BTG meets industry standards.
7.What is the process for return or replacement of MC79M05BTG?
All MC79M05BTG units undergo pre-shipment inspection (PSI). If there is an issue with MC79M05BTG, 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 MC79M05BTG part is unused and in its original packaging.
Return procedure for MC79M05BTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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