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onsemi NCP1086T-ADJG
- Part No.:
- NCP1086T-ADJG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
NCP1086T-ADJG.pdf
- Description:
- IC REG LIN POS ADJ 1.5A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,366
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Product details
Overview
NCP1086T-ADJG from onsemi is an adjustable-output linear voltage regulator delivering up to 1.5 A with ±1% output accuracy over temperature, 1.05 V typical dropout at full load, fast transient response, and integrated overcurrent/thermal shutdown protection. It serves as a post-regulator or microprocessor supply in low-voltage, high-transient-demand systems.
For engineers reviewing the NCP1086T-ADJG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1.5 A, thermal shutdown threshold (150–210°C), reference voltage stability (1.241–1.266 V), minimum load current requirement (0.6–2.0 mA), and compatibility with tantalum output capacitors for stability.
Technical Context
The NCP1086T-ADJG uses a composite PNP-NPN pass transistor architecture enabling low dropout and high current capability. Its error amplifier maintains a precise 1.25 V reference between VOUT and ADJ pins, with adjust pin current (50–100 µA) directly affecting output setpoint accuracy when using external resistors.
Thermal regulation is specified at 0.002–0.02 %/W, and ripple rejection reaches 80 dB at 120 Hz. Protection circuitry includes foldback current limiting (1.6–3.1 A) and functional thermal shutdown tested 100% in production at junction temperatures of 150–210°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A maximum - supports microprocessor core rails and FPGA I/O supplies requiring stable high-current regulation. |
| Reference Voltage | 1.254 V typical (1.241–1.266 V) - sets output via external resistor divider; determines absolute accuracy of adjustable output. |
| Dropout Voltage | 1.05 V typical at 1.5 A - enables operation with only 1.05 V headroom above output, critical for low-VIN applications like 5 V-to-3.3 V post-regulation. |
| Line Regulation | 0.02% typical - ensures <±0.66 mV change in 3.3 V output per 1 V input variation, minimizing sensitivity to upstream supply ripple. |
| Load Regulation | 0.04% typical - guarantees <±1.32 mV output shift from 10 mA to 1.5 A load, essential for dynamic digital loads. |
| Ripple Rejection | 80 dB at 120 Hz - attenuates 1 VP-P input ripple to 10 mVP-P at output, preserving clean power for noise-sensitive analog circuits. |
| Thermal Shutdown | 150–210°C activation range - protects against sustained overload or poor heatsinking; hysteresis of 25°C prevents oscillation near trip point. |
Pinout & Package
Package: TO−220−3 (T SUFFIX, Case 221A); tab connected to VOUT; Pb-free plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj) | Adjust reference node | Low-side terminal of internal 1.25 V bandgap reference; connects to resistor divider midpoint to set output voltage (1.25–5.5 V range). |
| 2 (VOUT) | Regulated output | Power output node and thermal tab connection; requires Kelvin sensing at package pin for specified load regulation accuracy. |
| 3 (VIN) | Input supply | Unregulated input; must stay within 7.0 V max differential vs. VOUT to avoid absolute maximum rating violation. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-10 µs recovery from 750 mA load step (±120 mV deviation), verified in Figure 9 - maintains CPU core voltage during burst-mode execution. |
| Low dropout architecture | 1.05 V typical at 1.5 A - enables efficient 5 V-to-3.3 V conversion without switching losses or EMI concerns. |
| Integrated fault protection | Current limit (1.6–3.1 A) + thermal shutdown (100% production tested) - eliminates need for external current-sense or thermal monitoring circuitry. |
| Stable with standard capacitors | Compatible with 22 µF tantalum output capacitor (no special ESR requirements) - simplifies BOM and avoids ceramic capacitor instability risks. |
| Pb-free packaging | RoHS-compliant TO−220−3 leadframe - meets environmental compliance mandates without derating or performance trade-offs. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulator |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.2–1.8 V at up to 1.5 A with rapid load transients during instruction fetch bursts. IC Role / Device Role / Timing Role: Primary linear post-regulator downstream of a switching DC-DC converter; provides ultra-low-noise, low-ripple bias independent of switching frequency artifacts. Use Value: 80 dB ripple rejection and <±1.32 mV load regulation ensure core voltage stays within ±1% tolerance during 0–1.5 A load swings, preventing timing violations. | Use Scenario: Supplies configurable 1.8/2.5/3.3 V I/O banks in Xilinx Artix-7 FPGAs where sequencing and noise immunity are critical. IC Role / Device Role / Timing Role: Adjustable-output LDO configured via precision resistor divider to match bank-specific voltage; provides independent regulation per bank. Use Value: ±1% output accuracy over −40 to +70°C and 1.25 V reference stability enable reliable I/O signaling margins across industrial temperature ranges. |
| Industrial PLC Power Module | Medical Diagnostic Sensor Interface |
Use Scenario: Generates stable 3.3 V or 5.0 V for microcontroller, CAN transceiver, and ADC subsystems in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Central low-noise supply rail generator; operates from wide-input 12–24 V DC bus with dropout headroom down to 1.05 V. Use Value: 1.5 A output current and thermal shutdown (150–210°C) support continuous operation in enclosed cabinets without forced air cooling. | Use Scenario: Powers low-noise analog front-end (AFE) circuits in portable ultrasound or ECG devices where EMI from switching regulators could corrupt µV-level sensor signals. IC Role / Device Role / Timing Role: Ultra-low-ripple linear regulator supplying ADC reference and op-amp bias rails; placed adjacent to sensitive analog signal paths. Use Value: 80 dB ripple rejection at 120 Hz and <0.02% line regulation suppress mains-borne noise, ensuring >12-bit effective resolution in data acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CT-ADJ | Pin-compatible but higher 1.3 V typical dropout at 1.5 A; ±2% reference voltage tolerance vs. ±1% for NCP1086T-ADJG. | Less suitable for low-headroom 5 V-to-3.3 V designs; wider reference tolerance reduces output setpoint accuracy. | Select LT1086CT-ADJ only if legacy design reuse or dual-sourcing is required; verify thermal margin due to higher dropout power dissipation. |
| TPS7A4701RGWR | Lower 0.3 V dropout at 1.5 A; 20 µV RMS noise vs. no specified noise for NCP1086T-ADJG; requires 2.2 µF ceramic output capacitor. | Better for ultra-low-noise analog rails; incompatible with tantalum-only capacitor designs due to ESR requirements. | Choose TPS7A4701RGWR for high-precision sensor interfaces; avoid in cost-sensitive industrial controls where tantalum caps reduce BOM cost. |
Compared with LT1086CT-ADJ and TPS7A4701RGWR, the NCP1086T-ADJG delivers optimal balance of low dropout (1.05 V), tight reference accuracy (±1%), and robustness with standard tantalum capacitors-making it ideal for industrial microprocessor supplies where reliability and ease of design outweigh ultra-low-noise or ultra-low-dropout requirements.
Availability
NCP1086T-ADJG is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic sensor interfaces, FPGA I/O banks, and microprocessor core supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for NCP1086T-ADJG 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 manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The NCP1086T-ADJG belongs to onsemi's NCP1086 linear regulator family, engineered specifically for high-current post-regulation in space-constrained industrial and computing systems where thermal robustness and dropout efficiency are prioritized over ultra-low noise.
FAQ
What is the maximum input-to-output voltage differential allowed for the NCP1086T-ADJG?
The NCP1086T-ADJG has an absolute maximum VIN–VOUT differential of 7.0 V. Exceeding this rating risks permanent damage, even if average power dissipation remains within limits. This constraint applies regardless of thermal management - the 7.0 V limit is a silicon-level breakdown specification, not a thermal limit. Designers must ensure that under all operating conditions, including startup and fault states, the differential stays below 7.0 V.
Can the NCP1086T-ADJG be used with ceramic output capacitors?
The NCP1086T-ADJG is characterized and stabilized for use with 22 µF tantalum capacitors and is not guaranteed stable with low-ESR ceramic capacitors. The datasheet explicitly recommends tantalum or aluminum electrolytic types due to their inherent ESR, which damps the control loop. Using ceramic capacitors may cause oscillation or poor transient response. If ceramics are required, external compensation or a hybrid network (ceramic + tantalum) must be validated per the Stability Considerations section on page 6 of the NCP1086 datasheet.
What is the minimum load current required for regulation in the NCP1086T-ADJG?
The NCP1086T-ADJG requires a minimum load current of 0.6–2.0 mA to maintain regulation, as specified in the Electrical Characteristics table. This current is typically supplied by the resistor divider connecting ADJ to ground. For a 3.3 V output set with R1 = 1 kΩ and R2 = 1.69 kΩ, the divider draws ~1.25 mA - satisfying the minimum load requirement. Failure to meet this current causes output voltage to rise uncontrollably above the setpoint.
How does thermal shutdown behave in the NCP1086T-ADJG during sustained overload?
The NCP1086T-ADJG features 100%-tested thermal shutdown activating between 150°C and 210°C, with 25°C hysteresis. During sustained overload, the device will shut down completely - dropping output voltage to near zero - and remain off until junction temperature falls below the hysteresis threshold (e.g., 185°C trip → 160°C restart). This behavior is non-latching and self-recovering, but repeated cycling indicates inadequate heatsinking or excessive ambient temperature.
Is the NCP1086T-ADJG pin-compatible with other TO-220 LDOs beyond the LT1086 family?
The NCP1086T-ADJG is explicitly documented as pin-compatible only with the LT1086 family of adjustable LDOs (e.g., LT1086CT-ADJ) in TO-220-3 packages. It is not pin-compatible with fixed-output LDOs (e.g., LM317T variants have different pinouts), nor with newer low-noise or ultra-low-dropout regulators like the TPS7A47 series, which use different pin assignments and thermal pad configurations. Always verify pin function mapping using the "PACKAGE PIN DESCRIPTION" tables on page 4 of the NCP1086 datasheet before substitution.
NCP1086T-ADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 1.4V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
NCP1086T-ADJG FAQ
1.How can I place an order for NCP1086T-ADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086T-ADJG 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 NCP1086T-ADJG reliable?
The price and inventory of NCP1086T-ADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086T-ADJG is usually 5 days.
3.What payment methods are accepted for NCP1086T-ADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086T-ADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086T-ADJG?
NCP1086T-ADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086T-ADJG 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 NCP1086T-ADJG?
For technical support, including NCP1086T-ADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086T-ADJG requirements.
6.How does Aetrix verify that NCP1086T-ADJG is sourced from the original manufacturer or authorized distributors?
All NCP1086T-ADJG 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 NCP1086T-ADJG meets industry standards.
7.What is the process for return or replacement of NCP1086T-ADJG?
All NCP1086T-ADJG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086T-ADJG, 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 NCP1086T-ADJG part is unused and in its original packaging.
Return procedure for NCP1086T-ADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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