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onsemi MC7815BT
- Part No.:
- MC7815BT
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7815BT.pdf
- Description:
- IC REG LINEAR 15V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,162
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Product details
Overview
MC7815BT from onsemi is a fixed-output +15 V, 1.0 A linear voltage regulator in TO-220 package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable DC power for industrial control logic, analog sensor interfaces, and legacy embedded systems requiring low-noise, non-switching regulation.
For engineers reviewing the MC7815BT datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world load regulation behavior, and validated drop-in alternatives for legacy power supply redesigns.
Technical Context
The MC7815BT uses a monolithic bipolar pass transistor architecture with integrated bandgap reference, error amplifier, and protection circuitry. Its dropout voltage remains fixed at 2.0 V (at 1.0 A, TJ = 25°C), enabling operation with input as low as 17.5 V under full load.
It features output voltage tolerance of ±3% (14.4 V to 15.6 V at TJ = 25°C) and exhibits −1.0 mV/°C average temperature coefficient-critical for precision analog subsystems where thermal drift must be bounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +15.0 V nominal, 14.4–15.6 V range at 25°C - ensures compatibility with TTL/CMOS logic rails and op-amp supplies. |
| Output Current | 1.0 A continuous - supports moderate-power analog circuits, relay drivers, and microcontroller peripherals without external boost. |
| Dropout Voltage | 2.0 V at 1.0 A - mandates minimum 17.5 V input under full load; dictates heatsink sizing for >1 W dissipation. |
| Ripple Rejection | 58 dB at 120 Hz - suppresses line-frequency ripple from unregulated AC/DC supplies by >770×. |
| Quiescent Current | 3.5–6.0 mA - enables low standby power in always-on industrial modules. |
| Thermal Shutdown | Activates at TJ ≥ +150°C - prevents catastrophic failure during transient overloads or inadequate heatsinking. |
| Short-Circuit Limit | 0.2 A typical - protects upstream components during output faults while allowing safe fault detection. |
Pinout & Package
MC7815BT is housed in a TO-220 package (Case 221AB) with electrically isolated heatsink tab connected internally to Pin 2 (Ground). The package supports vertical mounting with mechanical fastening and requires thermal interface material for reliable heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Accepts unregulated DC input (17.5–30 V); must be bypassed with ≥0.33 µF capacitor near pin for stability. |
| Pin 2 | Ground | Common reference for input, output, and heatsink; all grounds must share low-impedance path to avoid regulation error. |
| Pin 3 | Output | Delivers regulated +15 V; optional 0.1–1.0 µF output capacitor improves transient response but is not required for stability. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Operates stably with only input bypass cap - reduces BOM count and PCB area in space-constrained designs. |
| Internal thermal overload protection | Shuts down output above +150°C junction temperature - eliminates need for discrete thermal sensors or shutdown logic. |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT increases - prevents secondary breakdown during sustained overloads. |
| ±3% output tolerance (B-grade) | Tighter than standard C-grade (±5%) - simplifies system-level calibration and meets industrial-grade accuracy requirements. |
| Pb-free and RoHS-compliant | Meets EU Directive 2011/65/EU - supports green manufacturing and global market access without requalification. |
Applications
| Industrial PLC I/O Modules | Analog Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering isolated 4–20 mA transmitter circuits and digital input buffers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary +15 V rail generator for op-amps, ADC references, and optocoupler biasing. Use Value: Stable output minimizes offset drift in precision current loops; thermal protection prevents field failures during ambient temperature excursions. |
Use Scenario: Supplying dual-rail op-amps and bridge amplifiers in pressure, temperature, and strain gauge front-ends. IC Role / Device Role / Timing Role: Low-noise analog supply source with <10 µV/V output noise density. Use Value: 58 dB ripple rejection preserves SNR in 16-bit+ measurement systems; ±3% tolerance ensures consistent gain calibration across production units. |
| Legacy Embedded Control Systems | Test & Measurement Equipment Power Rails |
Use Scenario: Replacing obsolete 7815 regulators in aging medical devices and factory automation hardware. IC Role / Device Role / Timing Role: Drop-in compatible fixed-voltage regulator maintaining same pinout and thermal profile. Use Value: TO-220 footprint and identical electrical behavior enable zero-layout-change upgrades; AEC-Q100 qualified variants available for automotive-adjacent use. |
Use Scenario: Generating clean auxiliary rails for oscilloscope front-end amplifiers and spectrum analyzer local oscillators. IC Role / Device Role / Timing Role: Low-drift, low-noise DC source for sensitive analog signal paths. Use Value: −1.0 mV/°C tempco limits output drift to <15 mV over 0–70°C operating range - critical for calibrated instrument accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7815CT | ±2% output tolerance (tighter), higher quiescent current (4.5–8.0 mA), lower ripple rejection (50 dB @ 120 Hz) | Preferred where tighter initial accuracy outweighs efficiency loss; less suitable for high-ripple environments | Select LM7815CT when absolute output accuracy is prioritized over thermal performance and ripple suppression |
| NCV7815BT | Automotive-grade variant with AEC-Q100 qualification, extended temperature range (−40°C to +150°C), same electrical specs | Required for automotive body electronics, ADAS power domains, and harsh-environment industrial deployments | Choose NCV7815BT for mission-critical applications demanding PPAP documentation and extended thermal reliability |
Compared with LM7815CT, MC7815BT offers superior ripple rejection and lower quiescent current-key for energy-sensitive or noisy supply environments-while NCV7815BT adds automotive qualification without sacrificing core regulation performance.
Availability
MC7815BT is available at Aetrix Electronics and suitable for industrial PLCs, analog sensor interfaces, and legacy embedded control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MC7815BT 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 is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The MC7800 series was designed for robust, maintenance-free local regulation in harsh environments-emphasizing thermal resilience, fault tolerance, and long-term parametric stability over decades of field operation.
FAQ
What is the maximum input voltage rating for MC7815BT?
The MC7815BT has an absolute maximum input voltage of 35 Vdc. However, its recommended operating input range is 17.5 V to 30 Vdc to maintain regulation within specifications and ensure thermal safety. Exceeding 30 Vdc significantly increases power dissipation and risks triggering thermal shutdown under load.
Does MC7815BT require an input bypass capacitor?
Yes, MC7815BT requires a minimum 0.33 µF input bypass capacitor placed directly across Pins 1 and 2. This capacitor stabilizes the regulator against high-frequency noise and prevents oscillation-especially when input traces exceed 2 inches or connect to switching supplies. Tantalum or ceramic types with low ESR are preferred.
Can MC7815BT be used in parallel for higher current?
No, MC7815BT is not designed for direct parallel operation due to mismatched output voltages and lack of current-sharing circuitry. Attempting parallel connection may cause one device to dominate conduction, leading to thermal runaway. For >1.0 A, use a single higher-current regulator or implement active current balancing externally.
What is the thermal resistance junction-to-case for MC7815BT?
The MC7815BT has a thermal resistance of RJC = 5.0°C/W. When mounted on a properly sized heatsink with thermal compound, this value enables calculation of junction temperature rise: TJ = TCASE + (PD × 5.0). Accurate heatsink selection requires combining this with RCA (heatsink-to-ambient) for total thermal path analysis.
Is MC7815BT pin-compatible with older 7815 variants?
Yes, MC7815BT maintains identical TO-220 pinout (Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output), mechanical dimensions, and electrical interface as legacy 7815 regulators including LM7815 and UA7815. No PCB layout changes are needed for drop-in replacement in existing designs.
MC7815BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 58dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC7815BT FAQ
1.How can I place an order for MC7815BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7815BT 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 MC7815BT reliable?
The price and inventory of MC7815BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7815BT is usually 5 days.
3.What payment methods are accepted for MC7815BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7815BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7815BT?
MC7815BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7815BT 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 MC7815BT?
For technical support, including MC7815BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7815BT requirements.
6.How does Aetrix verify that MC7815BT is sourced from the original manufacturer or authorized distributors?
All MC7815BT 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 MC7815BT meets industry standards.
7.What is the process for return or replacement of MC7815BT?
All MC7815BT units undergo pre-shipment inspection (PSI). If there is an issue with MC7815BT, 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 MC7815BT part is unused and in its original packaging.
Return procedure for MC7815BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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