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onsemi LM317MADTRK
- Part No.:
- LM317MADTRK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LM317MADTRK.pdf
- Description:
- IC REG LINEAR POS ADJ 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,224
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Product details
Overview
LM317MADTRK from onsemi is a 500 mA adjustable positive voltage regulator in DPAK (DT) package, delivering 1.2 V to 37 V output with 1.25 V internal reference, ±2% output voltage tolerance, and built-in thermal shutdown and current limiting. It serves as a local on-card linear regulator for industrial power supplies and embedded control boards requiring stable, low-noise DC bias.
For engineers reviewing the LM317MADTRK datasheet, pinout, applications, or equivalent options, this page provides verified specifications, validated DPAK pin mapping, confirmed thermal performance at TJ = 0°C to +125°C, and two industry-validated alternative parts for adjustable linear regulation.
Technical Context
The LM317MADTRK operates as a floating three-terminal regulator with fixed 1.25 V reference between Vout and Adjust terminals, enabling programmable output via external R1/R2 divider. Its internal safe-area compensation and thermal shutdown circuitry ensure robust operation under overload or high ambient conditions.
It requires only two resistors for output setting and supports precision current regulation when a fixed resistor bridges Adjust and Vout. Input-output differential up to 40 V and minimum load current of 3.5 mA are key operational constraints defined in its electrical characteristics table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500 mA max - sufficient for powering microcontrollers, sensors, and analog front-ends without external pass transistors |
| Output Voltage Range | 1.2 V to 37 V - set by external resistors; enables single-part flexibility across multiple system rails |
| Reference Voltage | 1.25 V typical (1.225–1.275 V) - defines baseline accuracy for output calculation Vout = 1.25 × (1 + R2/R1) |
| Line Regulation | 0.01–0.04 %/V - ensures <±5 mV output shift per volt input change, critical for unregulated input sources |
| Load Regulation | 5.0 mV (VO ≤5 V) or 0.1% VO (VO ≥5 V) - maintains tight output stability across full 10 mA–500 mA load range |
| Thermal Shutdown Threshold | 180 °C - protects die during sustained overload or poor heatsinking; non-latching recovery |
| Adjust Pin Current | 50–100 µA - low and stable, minimizing error contribution in R2 value selection |
Pinout & Package
DPAK (DT suffix, Case 369C) package with exposed heatsink tab electrically connected to Pin 2 (Adjust). Requires PCB copper pad for thermal management per Figure 25.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Unregulated input supply; must exceed Vout by ≥3 V for regulation; max VI−VO = 40 V |
| 2 | Adjust | Reference node for feedback network; connects to R1–R2 junction; heatsink tab tied here |
| 3 | Vout | Regulated output; referenced to Adjust pin; delivers up to 500 mA with proper thermal design |
Key Features
| Feature | Design Value |
|---|---|
| Internal current limiting | Prevents destructive overcurrent during short-circuit events without external components |
| Floating operation capability | Enables high-side or battery-ground-referenced configurations without level-shifting circuitry |
| Safe-area compensated output transistor | Guarantees SOA compliance across temperature and voltage ranges-no derating curves needed |
| Pb-free DPAK packaging | RoHS-compliant, lead-free finish compatible with standard reflow profiles (J-STD-020) |
Applications
| Industrial Power Supply | Embedded Control Board |
|---|---|
Use Scenario: Local regulation for PLC I/O modules powered from 24 VDC bus with variable load demand. IC Role / Device Role / Timing Role: Primary linear regulator providing clean 5 V or 3.3 V rail to microcontroller and analog signal chain. Use Value: Eliminates need for multiple fixed-voltage regulators; ±2% tolerance meets industrial ADC reference requirements. | Use Scenario: On-board bias generation for sensor interface circuits in HVAC controllers operating at 0°C to 70°C ambient. IC Role / Device Role / Timing Role: Adjustable voltage source for op-amp rails and precision DAC references. Use Value: 1.25 V reference stability (0.7% temp drift) ensures consistent analog performance across temperature. |
| Test Equipment Power | LED Driver Bias |
Use Scenario: Programmable bench power supply channel delivering 1.5–12 V at ≤500 mA for prototype validation. IC Role / Device Role / Timing Role: Core adjustable regulator in constant-voltage output stage with manual potentiometer control. Use Value: Low RMS noise (0.003% VO) prevents interference in sensitive measurement circuits. | Use Scenario: Constant-current LED bias for status indicators in medical device panels requiring stable brightness. IC Role / Device Role / Timing Role: Precision current regulator using fixed R between Adjust and Vout (IOUT ≈ 1.25 V / R). Use Value: 100 µA max IAdj variation ensures <1% current error across line/load/temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDTRKG | Same DPAK package, but rated for TJ = −40°C to +125°C and ±4% output tolerance | Suitable for automotive or extended-temperature industrial use where wider tolerance is acceptable | Select when AEC-Q100 qualification or −40°C startup is required; not drop-in due to tolerance and temp range mismatch |
| TLV1117-33CDR | Fixed 3.3 V LDO in SOT-223; 800 mA output; 1.2 V dropout; no adjust pin | Replaces LM317MADTRK only in fixed-voltage, low-dropout scenarios with lower IQ and better PSRR | Choose for space-constrained 3.3 V rails where adjustability and high input voltage are unnecessary |
Compared with LM317MADTRK, LM317LDTRKG offers wider temperature range but looser output accuracy, while TLV1117-33CDR trades adjustability and high-VIN capability for lower dropout and fixed output-neither is pin-compatible, and both require schematic and layout changes.
Availability
LM317MADTRK is available at Aetrix Electronics and suitable for industrial power supplies, embedded control boards, test equipment power stages, and LED bias circuits requiring stable component supply with guaranteed long-term continuity.
Supply support for LM317MADTRK 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.
The LM317M series belongs to onsemi's legacy linear regulator product line, designed for cost-sensitive, robust local regulation in industrial, consumer, and computing applications where simplicity and reliability outweigh ultra-low quiescent current or switching efficiency.
FAQ
What is the maximum input-to-output voltage differential for LM317MADTRK?
The LM317MADTRK supports a maximum input-output voltage differential (VI−VO) of 40 Vdc, as specified in its Absolute Maximum Ratings table. Exceeding this limit risks permanent damage. This rating applies across the full operating temperature range of 0°C to +125°C and is independent of output current, provided power dissipation remains within package limits.
Does LM317MADTRK require an input bypass capacitor?
Yes, LM317MADTRK requires a 0.1 µF ceramic or disc input bypass capacitor (Cin) placed close to the Vin and GND pins, especially when the regulator is located appreciable distance from the main power supply filter. This reduces sensitivity to input line impedance and prevents potential instability or noise coupling into the regulation loop.
Can LM317MADTRK be used as a precision current regulator?
Yes, LM317MADTRK can function as a precision current regulator by connecting a single resistor between the Adjust and Output pins. The output current is approximately IOUT = 1.25 V / R, leveraging its stable internal reference. With IAdj controlled to ≤100 µA and low drift, current accuracy remains within ±2% over temperature and line variations when R has tight tolerance.
What is the thermal resistance (Junction-to-Air) for LM317MADTRK in DPAK package?
For LM317MADTRK in DPAK (DT suffix, Case 369C), the typical Junction-to-Air thermal resistance (θJA) is 92°C/W at TA = 25°C with standard PCB mounting. This value decreases significantly with increased copper pad area-e.g., 2.0 oz. copper extending 10 mm improves θJA to ~50°C/W per Figure 25. Heatsink tab connection to Pin 2 is mandatory for thermal performance.
Is LM317MADTRK RoHS compliant and lead-free?
Yes, LM317MADTRK is Pb-free and RoHS compliant, as confirmed in the Ordering Information table (page 10) and Marking Diagrams (page 11) of the official datasheet. The "G" suffix in the marking (e.g., "317MAG") explicitly denotes Pb-free packaging, and it meets JEDEC J-STD-020 reflow profile requirements for lead-free assembly.
LM317MADTRK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LM317MADTRK FAQ
1.How can I place an order for LM317MADTRK through Aetrix?
Please submit a Request for Quotation (RFQ) for LM317MADTRK 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 LM317MADTRK reliable?
The price and inventory of LM317MADTRK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM317MADTRK is usually 5 days.
3.What payment methods are accepted for LM317MADTRK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM317MADTRK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM317MADTRK?
LM317MADTRK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM317MADTRK 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 LM317MADTRK?
For technical support, including LM317MADTRK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM317MADTRK requirements.
6.How does Aetrix verify that LM317MADTRK is sourced from the original manufacturer or authorized distributors?
All LM317MADTRK 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 LM317MADTRK meets industry standards.
7.What is the process for return or replacement of LM317MADTRK?
All LM317MADTRK units undergo pre-shipment inspection (PSI). If there is an issue with LM317MADTRK, 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 LM317MADTRK part is unused and in its original packaging.
Return procedure for LM317MADTRK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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