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Semtech Corporation SC431MSKQTRT-01
- Part No.:
- SC431MSKQTRT-01
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431MSKQTRT-01.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,526
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Product details
Overview
SC431MSKQTRT-01 from Semtech is an adjustable three-terminal shunt regulator with 2.495 V reference voltage (±0.5% tolerance), 130 µA to 150 mA operating current range, 0.25 Ω typical dynamic output impedance, and military-grade temperature operation from –55°C to +125°C. It replaces Zener diodes in precision feedback loops of linear and switching power supplies.
For engineers reviewing the SC431MSKQTRT-01 datasheet, pinout, applications, or equivalent options, key selection criteria include reference voltage accuracy, cathode current capability, thermal stability over –55°C to +125°C, SOT-23-3 package compatibility, and direct drop-in suitability for TL431/TL1431 designs.
Technical Context
The SC431MSKQTRT-01 implements a trimmed bandgap reference core with active output circuitry enabling sharp turn-on behavior and low dynamic impedance. Its internal architecture supports stable regulation across full cathode voltage range (2.5 V to 30 V) using two external resistors while maintaining <25 mV reference deviation over temperature.
It operates with minimal reference input current (0.5–4 µA) and exhibits low off-state cathode leakage (≤0.5 µA at 30 V), enabling high-efficiency feedback networks. Stability is maintained up to 100 mA cathode current with load capacitance up to 10 nF per manufacturer-recommended conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±0.5% at 10 mA - enables precise output voltage setting from 2.5 V to 30 V via resistor divider |
| Operating Current Range | 130 µA to 150 mA - supports ultra-low-power standby and high-current regulation without external boost |
| Dynamic Output Impedance | 0.25 Ω typical - ensures tight regulation under fast load transients in SMPS feedback paths |
| Temp Range | –55°C to +125°C ambient - qualified for aerospace, defense, and industrial control environments |
| Max Cathode Voltage | 31 V absolute max - allows safe operation with 30 V regulated outputs and margin for ripple |
| Off-State Cathode Current | ≤0.5 µA at 30 V - minimizes quiescent loss in high-impedance feedback networks |
| Power Dissipation | 370 mW at 25°C (SOT-23-3) - defines thermal derating envelope for continuous operation |
Pinout & Package
SOT-23-3 surface-mount package with standard pin assignment: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference (REF). Thermal resistance θJA = 336°C/W; footprint compatible with IPC-SM-782A land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Regulated output node | Connects to supply rail being regulated; sinks current to maintain VREF at divider junction |
| Anode (Pin 2) | Ground return path | Low-impedance return for cathode current; must be tied to system ground with minimal trace inductance |
| Reference (Pin 3) | Feedback sense input | High-impedance input sensing voltage divider midpoint; sets regulation point when VREF = 2.495 V |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed bandgap reference | 0.5% initial VREF tolerance - eliminates need for post-manufacture calibration in precision supplies |
| Sharp turn-on characteristic | Active output stage enables fast response to load steps - improves transient regulation vs. passive Zener solutions |
| Military temperature rating | –55°C to +125°C operation - validated for extended environmental stress without parameter drift |
| Pb-free / RoHS compliant | Halogen-free SOT-23-3 package - meets global environmental compliance requirements for industrial and defense programs |
Applications
| Switching Power Supply Feedback | Linear Regulator Reference |
|---|---|
Use Scenario: Used in secondary-side feedback loop of isolated DC-DC converters to regulate output voltage via optocoupler interface. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise 2.495 V reference to drive optocoupler LED current proportional to output error. Use Value: Enables ±1% output regulation across line/load/temperature with no external trimming required. | Use Scenario: Replaces Zener diode in series-pass regulator feedback network to improve accuracy and thermal stability. IC Role / Device Role / Timing Role: High-impedance reference source setting base-emitter voltage of pass transistor via resistor divider. Use Value: Reduces output drift to <10 mV over –55°C to +125°C versus >50 mV for standard Zeners. |
| Programmable Voltage Monitor | Current Source Biasing |
Use Scenario: Configured as comparator-like threshold detector by tying REF to fixed voltage and monitoring cathode current onset. IC Role / Device Role / Timing Role: Precision voltage threshold element triggering protection circuitry when input exceeds setpoint. Use Value: Achieves 2.5 V trigger point with ±12.5 mV accuracy over full temperature range, eliminating calibration. | Use Scenario: Biases constant-current sink in analog front-end circuits using cathode as controlled current output node. IC Role / Device Role / Timing Role: Shunt-regulated current source delivering stable 1–100 mA with <0.5% variation across temperature. Use Value: Provides programmable bias current independent of supply rail fluctuations up to 30 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.5 V reference (±1%), 0.35 Ω rZ, –40°C to +125°C operation | Lacks military temp range; higher reference drift above 85°C | Preferred for commercial-grade cost-sensitive designs where full –55°C rating not required |
| AS431ASTZTR-G1 | 2.5 V reference (±0.5%), 0.22 Ω rZ, –40°C to +125°C, same SOT-23-3 | Lower dynamic impedance but limited to industrial temp range | Selected when tighter rZ is critical and extended cold operation is not needed |
Compared with TL431ACDR and AS431ASTZTR-G1, the SC431MSKQTRT-01 uniquely delivers 0.5% reference accuracy *plus* –55°C operation in the same SOT-23-3 footprint-making it the only option for high-reliability systems requiring both precision and extreme cold-start capability.
Availability
SC431MSKQTRT-01 is available at Aetrix Electronics and suitable for switching power supply feedback, linear regulator reference, and programmable voltage monitor applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SC431MSKQTRT-01 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for power management, protection, and sensing.
The SC431MSKQTRT-01 belongs to Semtech's precision shunt regulator product line, designed specifically for high-stability feedback and voltage reference applications in aerospace, defense, and industrial power systems.
FAQ
What is the reference voltage tolerance of the SC431MSKQTRT-01 over temperature?
The SC431MSKQTRT-01 has a 0.5% initial reference voltage tolerance at 25°C and maintains ≤25 mV total deviation over the full –55°C to +125°C operating ambient temperature range. This is achieved through trimmed bandgap design and on-die thermal compensation, ensuring stable regulation without external calibration in SC431MSKQTRT-01-based feedback networks.
Can the SC431MSKQTRT-01 replace TL431 in existing PCB layouts?
Yes, the SC431MSKQTRT-01 uses the same SOT-23-3 package and pinout (Cathode-Anode-REF) as TL431, enabling direct drop-in replacement. Its identical electrical interface, lower dynamic impedance (0.25 Ω vs. 0.35 Ω), and tighter reference tolerance make SC431MSKQTRT-01 a functional and performance upgrade without layout changes.
What is the minimum cathode current required for regulation in the SC431MSKQTRT-01?
The SC431MSKQTRT-01 requires a minimum cathode current of 130 µA to maintain regulation at the reference voltage. Below this level, the device exits active regulation and behaves as a high-impedance node. Designers must ensure resistor divider values guarantee IZ ≥ 130 µA even at minimum input voltage and maximum load in SC431MSKQTRT-01 applications.
Does the SC431MSKQTRT-01 support operation above 125°C ambient?
No-the SC431MSKQTRT-01 is rated for –55°C to +125°C ambient operation. Its junction temperature limit is +150°C, so operation above 125°C ambient is only possible with significant derating of power dissipation and verified board-level thermal management. The datasheet specifies all parameters within the stated ambient range, and SC431MSKQTRT-01 performance outside this range is not characterized.
Is the SC431MSKQTRT-01 RoHS and halogen-free compliant?
Yes, the SC431MSKQTRT-01 is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. This is confirmed in the official Semtech datasheet Rev. 2.6 and applies to the SOT-23-3 package used in SC431MSKQTRT-01. Compliance documentation is available upon request for SC431MSKQTRT-01 procurement audits.
SC431MSKQTRT-01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 130 µA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 150 mA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SC431MSKQTRT-01 FAQ
1.How can I place an order for SC431MSKQTRT-01 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431MSKQTRT-01 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 SC431MSKQTRT-01 reliable?
The price and inventory of SC431MSKQTRT-01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431MSKQTRT-01 is usually 5 days.
3.What payment methods are accepted for SC431MSKQTRT-01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431MSKQTRT-01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431MSKQTRT-01?
SC431MSKQTRT-01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431MSKQTRT-01 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 SC431MSKQTRT-01?
For technical support, including SC431MSKQTRT-01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431MSKQTRT-01 requirements.
6.How does Aetrix verify that SC431MSKQTRT-01 is sourced from the original manufacturer or authorized distributors?
All SC431MSKQTRT-01 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 SC431MSKQTRT-01 meets industry standards.
7.What is the process for return or replacement of SC431MSKQTRT-01?
All SC431MSKQTRT-01 units undergo pre-shipment inspection (PSI). If there is an issue with SC431MSKQTRT-01, 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 SC431MSKQTRT-01 part is unused and in its original packaging.
Return procedure for SC431MSKQTRT-01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431MSKQTRT-01 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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