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Diodes Incorporated AS78L12MTR-G1
- Part No.:
- AS78L12MTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AS78L12MTR-G1.pdf
- Description:
- IC REG LINEAR 12V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,145
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Product details
Overview
AS78L12MTR-G1 from Diodes Incorporated is a fixed-output +12 V, 100 mA positive voltage regulator in SOIC-8 package with internal current limiting, thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies and motherboard applications, maintaining ±5% output accuracy over −40 °C to +125 °C with 1.7 V dropout at 40 mA load.
For engineers reviewing the AS78L12MTR-G1 datasheet, AS78L12MTR-G1 pinout, AS78L12MTR-G1 application, or AS78L12MTR-G1 equivalent, key selection criteria include dropout voltage at 100 mA, PSRR of 37–42 dB at 120 Hz, thermal resistance (θJA = 62 °C/W), and SOIC-8 footprint compatibility with board-level space constraints.
Technical Context
This linear regulator uses a PNP pass transistor architecture with built-in short-circuit and thermal overload protection. Its internal safe-area compensation ensures reliable operation under transient overloads without external components.
It operates across an input range of 14.5 V to 27 V and maintains regulated output down to 1 mA load. The device exhibits 84 ppm/°C output voltage temperature coefficient and 80 µV RMS output noise (10 Hz–100 kHz), supporting low-noise analog and digital supply domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12.0 V nominal, ±5% tolerance (11.4–12.6 V) over full temperature and load range - ensures compatibility with 12 V logic and analog rails. |
| Max Output Current | 100 mA continuous - sufficient for local regulation of microcontrollers, sensors, and interface ICs. |
| Dropout Voltage | 1.7 V at 40 mA, 1.8 V at 100 mA - defines minimum headroom required between input and output for regulation. |
| PSRR | 37–42 dB at 120 Hz - suppresses ripple from upstream switching supplies or noisy DC sources. |
| Quiescent Current | 3–6 mA - enables low-power standby operation without significant supply drain. |
| Thermal Resistance θJA | 62 °C/W (SOIC-8) - determines junction temperature rise under 750 mW max power dissipation. |
| Output Noise | 80 µV RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuitry downstream. |
Pinout & Package
AS78L12MTR-G1 is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm body, 1.27 mm pitch). Pin 1 is INPUT; Pins 2, 4, 5, and 7 are GND; Pin 3 is OUTPUT; Pins 6 and 8 are NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated DC input (14.5–27 V); requires ≥0.33 µF ceramic bypass capacitor. |
| 2, 4, 5, 7 | GND | Common ground return path for input, output, and internal circuitry; multiple pins reduce impedance. |
| 3 | OUTPUT | Regulated +12 V output; requires ≥0.1 µF ceramic output capacitor for stability. |
| 6, 8 | NC | No internal connection; must be left floating or tied to GND per layout best practice (not electrically required). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +12 V output | Eliminates need for external feedback resistors - simplifies design and improves long-term voltage stability. |
| Internal thermal shutdown | Activates at ~150 °C junction temperature - prevents catastrophic failure during sustained overload or poor heatsinking. |
| Safe-area compensated pass transistor | Prevents secondary breakdown under high-voltage/high-current transients - enhances reliability in unregulated input environments. |
| No external components required | Reduces BOM count and PCB area; only input/output capacitors needed for stability and filtering. |
| Lead-free and green compliant | G1 suffix indicates halogen-free, RoHS-compliant packaging - meets environmental compliance for industrial and consumer shipments. |
Applications
| Microprocessor Power Supply | Motherboard Local Regulation |
|---|---|
|
Use Scenario: Providing clean 12 V bias to microcontroller I/O banks and peripheral interfaces on embedded control boards. IC Role / Device Role / Timing Role: Primary local voltage regulator supplying core logic and communication peripherals. Use Value: Maintains stable 12 V rail despite input ripple up to 27 V, enabling robust operation in automotive or industrial power environments. |
Use Scenario: Decoupling and regulation of 12 V auxiliary rails on PC motherboards or server backplanes. IC Role / Device Role / Timing Role: Point-of-load regulator for USB hub controllers, fan drivers, and BIOS chipsets. Use Value: SOIC-8 footprint allows dense placement near load; 62 °C/W θJA supports passive cooling in multi-regulator layouts. |
| Consumer Audio Amplifier Bias | Industrial Sensor Signal Conditioning |
|
Use Scenario: Generating low-noise ±12 V dual-rail supply (with complementary negative regulator) for op-amp stages in portable audio DACs. IC Role / Device Role / Timing Role: Positive rail regulator feeding precision op-amps and analog-to-digital converters. Use Value: 80 µV RMS output noise and 42 dB PSRR minimize audible hum and distortion in audio signal paths. |
Use Scenario: Powering 4–20 mA transmitter circuits and bridge sensor amplifiers in factory automation modules. IC Role / Device Role / Timing Role: Stable excitation source for Wheatstone bridges and reference voltage generator for ADC front-ends. Use Value: ±5% output accuracy and 84 ppm/°C tempco ensure consistent sensor gain and offset calibration across operating temperature. |
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 |
|---|---|---|---|
| LM78L12ACM/NOPB | TO-92 or SOIC-8; ±4% output tolerance; higher quiescent current (5.5 mA typ); no NC pins. | Lower cost for non-space-constrained designs; less suitable for high-density SOIC layouts requiring pin 6/8 routing flexibility. | Select when tighter initial output tolerance is required and thermal performance is secondary. |
| MC78L12CP | TO-92 only; ±5% tolerance; 100 mA rating; θJA = 180 °C/W - significantly higher thermal resistance than SOIC-8. | Requires external heatsink for >30 mA loads; unsuitable for compact surface-mount assemblies. | Choose only for through-hole prototyping or legacy board replacements where SOIC footprint is unavailable. |
Compared with LM78L12ACM/NOPB and MC78L12CP, AS78L12MTR-G1 offers superior thermal performance in SOIC-8 (62 °C/W vs. 180 °C/W), dedicated NC pins for optimized layout, and green/halogen-free compliance - making it preferred for modern high-density industrial and consumer PCBs.
Availability
AS78L12MTR-G1 is available at Aetrix Electronics and suitable for microprocessor power supply, motherboard local regulation, consumer audio amplifier bias, and industrial sensor signal conditioning requiring stable component supply, RoHS compliance, and SOIC-8 manufacturability.
Supply support for AS78L12MTR-G1 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AS78LXX series targets cost-sensitive, space-constrained local regulation applications where simplicity, thermal robustness, and fixed-output stability outweigh programmability or ultra-low quiescent current needs.
FAQ
What is the minimum input voltage required for AS78L12MTR-G1 to maintain regulation?
The recommended minimum input voltage is 14.5 V, per the datasheet's Recommended Operating Conditions. Below this, output voltage drops below specification due to insufficient headroom relative to the 1.7–1.8 V dropout voltage. Sustained operation below 14.5 V risks unregulated output and potential instability.
Can AS78L12MTR-G1 replace older 78L12 variants in existing SOIC-8 footprints?
Yes - AS78L12MTR-G1 uses the standard SOIC-8 outline (6.2 mm × 4.0 mm) with identical pin 1 location and pad layout as industry-standard 78L12 SOIC packages. Pin functions match exactly: Pin 1 = INPUT, Pin 3 = OUTPUT, Pins 2/4/5/7 = GND, Pins 6/8 = NC.
Does AS78L12MTR-G1 require external capacitors, and what values are recommended?
Yes: a minimum 0.33 µF ceramic capacitor on the INPUT pin and 0.1 µF ceramic capacitor on the OUTPUT pin are required for stability and transient response. Larger values (e.g., 1 µF) improve ripple rejection but do not affect basic regulation. Electrolytic or tantalum caps are not recommended due to ESR sensitivity.
How does the SOIC-8 package affect thermal performance compared to TO-92 or SOT-89 versions?
The SOIC-8 version has θJA = 62 °C/W, significantly lower than TO-92 (180 °C/W) and comparable to SOT-89 (28.3 °C/W). This enables higher continuous current (up to 100 mA) without heatsinking on standard FR-4 PCBs with 2 oz copper and thermal vias - unlike TO-92, which requires heatsinking above ~30 mA.
AS78L12MTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.8V @ 100mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 42dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AS78L12MTR-G1 FAQ
1.How can I place an order for AS78L12MTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS78L12MTR-G1 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 AS78L12MTR-G1 reliable?
The price and inventory of AS78L12MTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS78L12MTR-G1 is usually 5 days.
3.What payment methods are accepted for AS78L12MTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS78L12MTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS78L12MTR-G1?
AS78L12MTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS78L12MTR-G1 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 AS78L12MTR-G1?
For technical support, including AS78L12MTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS78L12MTR-G1 requirements.
6.How does Aetrix verify that AS78L12MTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS78L12MTR-G1 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 AS78L12MTR-G1 meets industry standards.
7.What is the process for return or replacement of AS78L12MTR-G1?
All AS78L12MTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS78L12MTR-G1, 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 AS78L12MTR-G1 part is unused and in its original packaging.
Return procedure for AS78L12MTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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