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onsemi MC7912BD2TG
- Part No.:
- MC7912BD2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7912BD2TG.pdf
- Description:
- IC REG LINEAR -12V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
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Product details
Overview
MC7912BD2TG from onsemi is a fixed-output negative voltage regulator delivering −12 V at up to 1.0 A, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged operation in industrial power supplies. It requires no external components for basic regulation and maintains stable output under input ripple up to −35 V with ≥2.0 V headroom.
For engineers reviewing the MC7912BD2TG datasheet, pinout, applications, or equivalent options, key selection criteria include its −12 V output tolerance (±4%), D2PAK package thermal performance (θJC = 5.0°C/W), dropout voltage of 1.3 V at 1.0 A, and suitability for dual-rail op-amp supplies and MECL system biasing.
Technical Context
The MC7912BD2TG implements a monolithic bipolar pass transistor with integrated protection circuitry including current-limit foldback, thermal overload sensing, and safe-area compensation to prevent second breakdown during output shorts. Its internal bias network draws 4.4 mA typical input current and delivers regulated −12 V across load currents from 5 mA to 1.0 A.
Designed for operation over TJ = −40°C to +125°C, it achieves 61 dB ripple rejection at 120 Hz and exhibits 75 µVRMS output noise (10 Hz–100 kHz). Line regulation is specified at 24 mV over −16 V ≤ VI ≤ −22 V at 1.0 A, while load regulation is 46 mV across 5 mA–1.5 A at TJ = +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −12 V nominal, −11.5 V to −12.5 V range at TJ = +25°C - ensures compatibility with −12 V logic and analog rails |
| Output Current | 1.0 A maximum continuous - supports medium-power analog circuits and dual-supply op-amps |
| Input Voltage Range | −14.5 V to −30 V - requires ≥2.5 V differential headroom for regulation stability |
| Dropout Voltage | 1.3 V at 1.0 A and +25°C - determines minimum input-to-output differential for regulation |
| Ripple Rejection | 61 dB at 120 Hz - suppresses AC line noise in unregulated DC inputs |
| Thermal Resistance | θJC = 5.0°C/W - enables high-power dissipation when mounted on heatsink |
| Operating Temperature | −40°C to +125°C junction - suitable for automotive under-hood and industrial control environments |
Pinout & Package
D2PAK (Case 936) surface-mount package with heatsink surface electrically connected to Pin 2 (Input). Requires PCB copper area for thermal management per Figure 12 in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground | Reference node for output voltage; must be low-impedance connection to system ground plane |
| Pin 2 | Input | Negative input supply rail; also serves as thermal interface to heatsink |
| Pin 3 | Output | Regulated −12 V output; bypass capacitor (≥1.0 µF) required for transient stability |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM designs for fixed −12 V point-of-load regulation |
| Internal thermal overload protection | Shuts down at +150°C junction temperature to prevent permanent damage during sustained overload |
| Internal short-circuit current limiting | Clamps output current to safe level during output-to-ground faults without external sensing |
| Safe-area compensated output transistor | Prevents secondary breakdown during high-voltage, high-current transients (e.g., capacitive loads) |
| Pb-free D2PAK package | RoHS-compliant lead finish (G-suffix) compatible with standard reflow profiles |
Applications
| Operational Amplifier Dual Supply | Industrial Control Power Rail |
|---|---|
|
Use Scenario: Providing symmetrical ±15 V or ±12 V rails for precision op-amps in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Negative voltage regulator supplying stable −12 V to op-amp negative supply pin. Use Value: Eliminates need for discrete negative charge pump or transformer-based supply; supports rail-to-rail input op-amps requiring clean, low-noise negative bias. |
Use Scenario: Powering PLC I/O modules, analog input cards, and isolated DACs in factory automation systems. IC Role / Device Role / Timing Role: Primary −12 V regulator for analog front-end circuitry interfacing with 4–20 mA current loops. Use Value: Withstands industrial ambient temperatures (−40°C to +85°C case) and input ripple from rectified AC mains. |
| MECL Logic Bias Supply | Test Equipment Power Module |
|
Use Scenario: Generating precise −5.2 V or −12 V bias for ECL/MECL digital logic families in high-speed communication test gear. IC Role / Device Role / Timing Role: Fixed negative reference source ensuring consistent logic threshold voltage across temperature. Use Value: 4% output tolerance and −1.0 mV/°C tempco maintain timing margins in sub-nanosecond edge-rate circuits. |
Use Scenario: Embedded power stage in benchtop multimeters, oscilloscope channel supplies, and calibration sources. IC Role / Device Role / Timing Role: Regulated −12 V source for analog-to-digital converter reference buffers and multiplexer drivers. Use Value: 75 µVRMS output noise and 61 dB ripple rejection preserve measurement accuracy in 6½-digit instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC7912CTG | TO-220 package, same −12 V output but 4% tolerance and 0°C to +125°C operating range | Lacks extended −40°C low-temp capability; higher θJA (65°C/W vs. 70°C/W) limits power handling in confined spaces | Select when through-hole assembly is preferred and full industrial temperature range is not required |
| LM7912CD2T | Same D2PAK package and −12 V output, but TI part has 5% tolerance and 60 dB ripple rejection | Lower PSRR and wider output tolerance reduce suitability for precision analog rails | Choose only if cross-manufacturer second-source validation is complete and thermal margin allows |
Compared with MC7912CTG and LM7912CD2T, MC7912BD2TG offers guaranteed −40°C startup, tighter thermal resistance control in D2PAK, and superior ripple rejection-making it optimal for automotive and harsh-environment designs where reliability under cold-start and noisy input conditions is critical.
Availability
MC7912BD2TG is available at Aetrix Electronics and suitable for industrial control systems, test equipment power modules, operational amplifier dual supplies, and MECL logic biasing requiring stable component supply with full industrial temperature support.
Supply support for MC7912BD2TG 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, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 Series-including MC7912BD2TG-is designed specifically for robust, fixed-output negative voltage regulation in cost-sensitive, high-reliability power systems where simplicity, thermal resilience, and built-in protection are essential.
FAQ
What is the maximum input voltage rating for MC7912BD2TG?
The MC7912BD2TG has a maximum input voltage rating of −35 V for output voltages between −5.0 V and −18 V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent device damage due to junction breakdown, even momentarily. For reliable operation, maintain input within −14.5 V to −30 V per electrical characteristics.
Does MC7912BD2TG require input and output capacitors?
Yes, MC7912BD2TG requires both input and output capacitors for stable operation. A minimum 0.33 µF input capacitor (tantalum or low-ESR ceramic) is recommended when the regulator is located more than a few inches from the power supply filter. A 1.0 µF output capacitor improves transient response and stability-especially with capacitive loads-and is mandatory per application guidelines in the datasheet.
What is the thermal resistance and heatsinking requirement for MC7912BD2TG?
MC7912BD2TG has θJC = 5.0°C/W and θJA = 70°C/W (free air). To sustain 1.0 A output at full temperature range, a heatsink or substantial PCB copper area is required. Figure 12 shows that 25 mm of 2 oz. copper reduces θJA to ~40°C/W. Without heatsinking, power dissipation must be limited to ~0.7 W at +50°C ambient to avoid thermal shutdown.
How does MC7912BD2TG compare to MC7912ACTG in output voltage tolerance?
MC7912BD2TG has a 4% output voltage tolerance (−11.5 V to −12.5 V), whereas MC7912ACTG specifies 2% tolerance (−11.75 V to −12.25 V). The "B" grade prioritizes extended temperature range (−40°C to +125°C) over tight regulation, making it suitable for environments where thermal drift dominates initial accuracy-while the "A" grade targets precision analog applications with tighter initial error budgets.
Can MC7912BD2TG be used in parallel for higher current output?
No, MC7912BD2TG is not designed for direct parallel operation. Its output voltage tolerance and load regulation characteristics cause current imbalance-potentially leading to thermal runaway. For >1.0 A requirements, use a current-boost configuration with an external pass transistor (as shown in Figure 9 of the datasheet), or select a higher-current regulator such as the MC7912CD2TG (same package, different grade).
MC7912BD2TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 61dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7912BD2TG FAQ
1.How can I place an order for MC7912BD2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7912BD2TG 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 MC7912BD2TG reliable?
The price and inventory of MC7912BD2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7912BD2TG is usually 5 days.
3.What payment methods are accepted for MC7912BD2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7912BD2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7912BD2TG?
MC7912BD2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7912BD2TG 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 MC7912BD2TG?
For technical support, including MC7912BD2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7912BD2TG requirements.
6.How does Aetrix verify that MC7912BD2TG is sourced from the original manufacturer or authorized distributors?
All MC7912BD2TG 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 MC7912BD2TG meets industry standards.
7.What is the process for return or replacement of MC7912BD2TG?
All MC7912BD2TG units undergo pre-shipment inspection (PSI). If there is an issue with MC7912BD2TG, 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 MC7912BD2TG part is unused and in its original packaging.
Return procedure for MC7912BD2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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