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STMicroelectronics TS4436ICT
- Part No.:
- TS4436ICT
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TS4436ICT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:13,879
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Product details
Overview
TS4436ICT from STMicroelectronics is a four-terminal adjustable shunt voltage reference with 0.6V ±1% initial accuracy, 150ppm/°C temperature coefficient, and ultra-low 75mV max saturation voltage at 20mA sink current; it operates down to 1.7V supply and targets secondary-side feedback in isolated DC/DC converters.
For engineers reviewing the TS4436ICT datasheet, TS4436ICT pinout, TS4436ICT application, or TS4436ICT equivalent, key selection criteria include its open-collector output architecture, sub-1.8V regulation capability, industrial temperature range (–40°C to +85°C), low 150µA supply current, and SC70-5 package compatibility with space-constrained SMPS designs.
Technical Context
The TS4436ICT implements a precision 0.6V bandgap reference core with integrated error amplifier and open-collector NPN output transistor. Its REF pin senses feedback voltage in closed-loop configurations, while the SINK terminal delivers proportional current to regulate output via optocoupler-coupled feedback paths.
Unlike fixed-reference ICs, it supports adjustable output via external resistor dividers connected to REF and V; its 1.7V minimum operating voltage and 75mV max VSAT enable regulation of outputs as low as 1.8V - a critical capability for modern low-voltage isolated supplies where TL431-based solutions fail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 0.6V ±1% at 25°C; ensures stable feedback threshold for ±1% output voltage tolerance in regulated supplies |
| Tempco | 150 ppm/°C; limits Vref drift to ±0.0126V over –40°C to +85°C, supporting industrial-grade stability |
| Saturation Voltage | ≤75mV at 20mA sink; enables regulation of 1.8V outputs when series-connected with optocoupler LED |
| Supply Voltage Range | 1.7V to 10V; allows operation directly from low-voltage auxiliary rails without LDO pre-regulation |
| Supply Current | 150µA typical at 2mA sink; minimizes quiescent loss in standby and light-load conditions |
| Operating Temp | –40°C to +85°C; qualified for industrial ambient environments without derating |
Pinout & Package
TS4436ICT is housed in a 5-pin SC70 plastic micropackage (JEDEC MO-203AA), measuring 2.2mm × 1.35mm × 0.9mm, with gull-wing leads and lead-free finish compliant with ECOPACK® requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Dedicated ground return for internal reference and amplifier circuitry; separate from signal GND to minimize noise coupling |
| 2 (GND) | Signal Ground | Reference ground for REF input; must be tied to PGND externally but kept low-impedance and noise-isolated in layout |
| 3 (REF) | Feedback Input | High-impedance node sensing divided output voltage; regulates Vref = 0.6V by adjusting sink current at SINK |
| 4 (V) | Supply Input | Primary power rail connection (1.7–10V); powers internal reference, amplifier, and output stage |
| 5 (SINK) | Open-Collector Output | NPN collector output sinking up to 20mA; requires external pull-up to VCC or optocoupler anode for feedback loop closure |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable 0.6V Reference | Enables precise output regulation across wide voltage ranges using external resistor divider - no trimming required |
| Ultra-Low Saturation Voltage | 75mV max at 20mA allows direct series connection with optocoupler LED even at 1.8V output, eliminating need for auxiliary bias winding |
| Low Supply Current | 150µA typical enables high-efficiency operation in standby and light-load modes without compromising regulation accuracy |
| Industrial Temperature Range | –40°C to +85°C operation ensures reliable performance in embedded power systems without thermal derating |
Applications
| Isolated DC/DC Converter | Low-Voltage SMPS |
|---|---|
Use Scenario: Secondary-side voltage regulation in flyback or forward converters with optocoupler feedback isolation. IC Role / Device Role / Timing Role: Shunt reference and error amplifier providing closed-loop feedback current to control primary-side PWM controller via optocoupler. Use Value: Enables 1.8V–5V output regulation with <±1% accuracy and minimal auxiliary winding dependency due to 75mV VSAT. | Use Scenario: Compact, low-cost AC/DC adapter or USB-C PD secondary-side regulation under tight board area constraints. IC Role / Device Role / Timing Role: Adjustable shunt reference replacing TL431 in applications requiring <2V output compliance and SC70 footprint. Use Value: Reduces solution size by 40% vs. SOT-23-5 alternatives while maintaining 150ppm/°C stability and 1.7V start-up capability. |
| Computer Power Supply | Low-Voltage Discrete Regulator |
Use Scenario: Standby rail (e.g., +5VSB or +3.3VSB) regulation in ATX or EPS-compliant desktop/server PSUs. IC Role / Device Role / Timing Role: Precision feedback element ensuring tight voltage tolerance during low-power sleep states. Use Value: 150µA supply current minimizes no-load losses; 150ppm/°C tempco maintains ±1.5% output accuracy across full industrial temperature range. | Use Scenario: Point-of-load regulation for FPGA I/O banks or ASIC core supplies where discrete LDOs lack precision. IC Role / Device Role / Timing Role: Programmable shunt reference setting feedback threshold for external pass transistor or controller. Use Value: 0.6V reference allows use of standard resistor values for 1.2V, 1.8V, or 2.5V outputs; SC70 package fits dense PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Fixed 2.495V reference; higher 2.5V min cathode-anode voltage; 100ppm/°C tempco; SOT-23-3 package | Requires resistive divider to achieve sub-2V outputs; cannot regulate below ~2.5V without additional components | Select when higher reference voltage and tighter tempco are acceptable, and board space permits larger SOT-23-3 footprint |
| MAX8501ESA+ | 0.6V reference; 100ppm/°C tempco; 200µA supply current; SO-8 package; no open-collector output | Integrated op-amp output drives external transistor directly; not compatible with optocoupler-based isolation schemes | Select when driving discrete pass devices is preferred over optocoupler feedback, and SO-8 mounting is acceptable |
Compared with TL431ACDBVR and MAX8501ESA+, TS4436ICT uniquely combines 0.6V reference, ultra-low VSAT, and open-collector output in SC70-5 - enabling compact, low-voltage isolated regulation unattainable with either alternative.
Availability
TS4436ICT is available at Aetrix Electronics and suitable for isolated DC/DC converters, low-voltage switch mode power supplies, and computer standby rail regulation requiring stable component supply and long-term industrial-grade availability.
Supply support for TS4436ICT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS4436ICT belongs to ST's precision analog reference product line, engineered specifically for high-accuracy, low-voltage feedback in isolated power conversion topologies where traditional references fall short.
FAQ
What is the maximum sink current rating for TS4436ICT?
The TS4436ICT is rated for continuous sink current up to 20mA under normal operating conditions, with absolute maximum rating of 30mA. At 20mA, saturation voltage remains ≤75mV, ensuring reliable operation in optocoupler-coupled feedback loops without excessive power dissipation in the device.
Can TS4436ICT replace TL431 in existing designs?
TS4436ICT can replace TL431 only in designs requiring ≤1.8V output regulation or where SC70-5 footprint and ultra-low VSAT are critical. It is not pin-compatible: TL431 uses 3 pins (KA, R, A), while TS4436ICT uses 5 pins (PGND, GND, REF, V, SINK) and requires separate ground routing for optimal noise immunity.
What is the role of the PGND and GND pins?
PGND (Pin 1) serves as the power ground return for internal reference and amplifier circuitry, while GND (Pin 2) is the dedicated signal ground reference for the REF input. They must be connected externally but routed separately on PCB to prevent switching noise from power ground from corrupting the high-impedance REF node.
Does TS4436ICT require external compensation?
No external compensation is required for basic operation. The internal amplifier is unity-gain stable with typical optocoupler and divider networks. However, if used with high-capacitance feedback paths or fast-response controllers, a small capacitor (10–100pF) from REF to GND may be added to suppress high-frequency oscillation observed in some isolated converter layouts.
TS4436ICT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 1.8 V
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 250 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
TS4436ICT FAQ
1.How can I place an order for TS4436ICT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS4436ICT 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 TS4436ICT reliable?
The price and inventory of TS4436ICT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4436ICT is usually 5 days.
3.What payment methods are accepted for TS4436ICT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4436ICT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS4436ICT?
TS4436ICT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS4436ICT 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 TS4436ICT?
For technical support, including TS4436ICT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4436ICT requirements.
6.How does Aetrix verify that TS4436ICT is sourced from the original manufacturer or authorized distributors?
All TS4436ICT 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 TS4436ICT meets industry standards.
7.What is the process for return or replacement of TS4436ICT?
All TS4436ICT units undergo pre-shipment inspection (PSI). If there is an issue with TS4436ICT, 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 TS4436ICT part is unused and in its original packaging.
Return procedure for TS4436ICT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS4436ICT 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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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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