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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics TS4436AICT

Name: TS4436AICT
Brand: STMicroelectronics
SKU: TS4436AICT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4436AICT

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: TS4436AICT.pdf

Description:: IC VREF SHUNT ADJ 0.5% SC70-5

Quantity:: RFQ Add To RFQ list

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Inventory:1,159

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Product details

Overview

TS4436AICT from STMicroelectronics is an adjustable 0.6 V open-collector shunt voltage reference optimized for low-voltage SMPS feedback loops. It integrates a precision 0.6 V ±0.5% reference, error amplifier, and ultra-low-V_SAT (≤60 mV @ 20 mA) NPN output transistor in SC70-5 package. Used in isolated DC/DC converters with 1.8 V output, it enables stable regulation where headroom is constrained.

For engineers reviewing the TS4436AICT datasheet, TS4436AICT pinout, TS4436AICT application, or TS4436AICT equivalent, key selection criteria include its 0.6 V reference accuracy, 150 µA supply current, 1.7 V minimum operating voltage, 150 ppm/°C tempco, and open-collector sink capability up to 20 mA - all critical for compact, low-input-voltage power supplies.

Technical Context

The TS4436AICT operates as a 4-terminal shunt regulator: REF pin senses feedback voltage, VCC supplies bias, SINK sinks error current into optocoupler LED, and PGND/GND provide separate power/ground returns to minimize noise coupling. Its internal amplifier compares REF voltage to 0.6 V and drives the open-collector transistor accordingly.

Unlike standard TL431-based designs, TS4436AICT achieves regulation down to 1.8 V output by maintaining ≤60 mV saturation voltage across SINK–GND at full load, enabling use with low-forward-voltage optocouplers without external level-shifting circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_REF	0.6 V ±0.5% (0.597–0.603 V @ 25°C); enables precise 1.8 V output setpoint in isolated SMPS
V_SAT (SINK–GND)	≤60 mV @ 20 mA, -40°C to +85°C; allows direct series connection with optocoupler LED at low output voltages
I_CC	150–250 µA over temperature; minimizes auxiliary winding loading in flyback converters
V_CC Range	1.7 V to 10 V; supports operation from 1.8 V outputs without external bias supply
Tempco	150 ppm/°C; ensures <±5 mV drift over -40°C to +85°C for stable long-term regulation
Regulation Line/Load	≤3 mV line change (1.7–10 V), ≤7 mV load change (0.1–20 mA); maintains tight output tolerance under dynamic conditions

Pinout & Package

TS4436AICT is housed in a 5-pin SC70 package (JEDEC MO-203AA), measuring 2.2 × 1.35 × 1.1 mm, with lead-free terminations compliant with ECOPACK® and RoHS.

Pin/Terminal	Circuit Role	Design Meaning
1 - PGND	Power ground return	Separate low-impedance path for SINK current to reduce ground bounce in feedback loop
2 - GND	Analog ground reference	Reference node for internal amplifier and REF input; decoupled from PGND to suppress noise coupling
3 - REF	Feedback voltage sense input	High-impedance input (I_REF ≤ 65 nA) that sets output voltage via resistor divider (V_OUT = 0.6 × (1 + R1/R2))
4 - V	Supply voltage input	Bias rail for internal circuitry; operates down to 1.7 V, enabling direct use on low-voltage secondary side
5 - SINK	Open-collector NPN collector	Sinks regulated current to PGND; requires external pull-up (e.g., optocoupler LED anode) to set feedback loop gain

Key Features

Feature	Design Value
0.6 V precision reference	±0.5% initial accuracy enables 1.8 V output with ±9 mV absolute tolerance without trimming
Ultra-low V_SAT	≤60 mV @ 20 mA ensures ≥1.74 V headroom remains for optocoupler forward voltage at full load
Dual ground separation (PGND/GND)	Reduces switching noise injection into REF node, improving stability in high-dV/dt SMPS environments
1.7 V minimum V_CC	Eliminates need for auxiliary bias winding or charge pump in sub-2 V output converters

Applications

Isolated Flyback Converter

Low-Voltage DC/DC Module

Use Scenario: Secondary-side regulation in 1.8 V/3 A isolated flyback for industrial I/O module.

IC Role / Device Role / Timing Role: Shunt reference and error amplifier driving optocoupler LED to close feedback loop.

Use Value: 0.6 V reference + ≤60 mV V_SAT enables regulation without auxiliary winding, reducing BOM count and board area.

Use Scenario: Compact 1.2 V → 1.8 V isolated DC/DC converter for FPGA core supply.

IC Role / Device Role / Timing Role: Precision voltage sensing and current sinking element in opto-coupled feedback path.

Use Value: 150 µA supply current minimizes loading on 1.2 V primary-side bias rail, preserving efficiency.

USB-C Power Delivery Adapter

Programmable Logic Controller (PLC) Power Rail

Use Scenario: 5 V → 1.8 V isolated buck-boost converter in multi-output USB-C PD adapter.

IC Role / Device Role / Timing Role: Adjustable shunt reference setting output voltage via DAC-controlled divider.

Use Value: 0.6 V base reference with 150 ppm/°C tempco ensures ±0.5% output stability across ambient temperature swings.

Use Scenario: 24 V input → 1.8 V isolated auxiliary supply for PLC analog front-end ICs.

IC Role / Device Role / Timing Role: Feedback reference in wide-input-range isolated flyback with variable load.

Use Value: Dual ground pins (PGND/GND) suppress EMI-induced REF node perturbation in noisy industrial environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDT	2.495 V nominal reference; higher V_KA min = 2.5 V; no PGND/GND separation	Requires resistive divider to scale 1.8 V output; needs ≥2.5 V headroom, limiting use below ~3.3 V outputs	Select only if output >3.3 V or existing TL431 layout reuse is required
MAX8501ESA+	Adjustable 0.6 V reference; 1.5 V min V_CC; but only 3-pin SOT23 package, no PGND/GND isolation	Lacks dedicated PGND, increasing susceptibility to ground noise in high-noise SMPS; limited to non-isolated or low-dV/dt topologies	Prefer when space is critical and noise immunity is secondary to footprint reduction

Compared with TL431ACDT and MAX8501ESA+, TS4436AICT uniquely combines 0.6 V reference, ultra-low V_SAT, dual-ground architecture, and SC70-5 packaging - making it the only option capable of stable 1.8 V isolated regulation without auxiliary bias or noise mitigation compromises.

Availability

TS4436AICT is available at Aetrix Electronics and suitable for isolated DC/DC converters, low-voltage switch-mode power supplies, and industrial embedded power rails requiring stable component supply across extended temperature ranges.

Supply support for TS4436AICT 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 microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The TS4436 belongs to ST's precision analog reference product line, engineered specifically for low-headroom, isolated power supply feedback applications where traditional 2.5 V references fail.

FAQ

What is the maximum sink current TS4436AICT can deliver continuously?

TS4436AICT is rated for continuous sink current up to 20 mA over the full -40°C to +85°C range, with saturation voltage guaranteed ≤140 mV. At 20 mA and 25°C, typical V_SAT is 90–120 mV. Exceeding 20 mA risks thermal overload given its 310 mW SC70 power dissipation limit at 25°C ambient.

Can TS4436AICT replace TL431 in existing designs?

Direct replacement is not recommended due to fundamental differences: TS4436AICT has a 0.6 V reference (vs. TL431's 2.495 V), 5-pin SC70 package (vs. TL431's 3-pin SOT23), and separate PGND/GND pins. Circuit redesign - including feedback divider scaling and PCB layout changes - is required to leverage its low-voltage capability.

Why does TS4436AICT have two ground pins (PGND and GND)?

PGND carries high-current SINK return path to minimize IR drop and switching noise, while GND serves as quiet reference for the internal amplifier and REF input. This separation prevents SINK current transients from modulating the reference voltage, enhancing loop stability in noisy SMPS environments - a key differentiator versus single-ground shunt references.

Is TS4436AICT qualified for automotive applications?

No. TS4436AICT is specified only for industrial temperature range (-40°C to +85°C) and is not AEC-Q100 qualified. ST does not recommend or warrant its use in automotive safety-critical systems. For automotive-grade alternatives, consult ST's ASIL-compliant voltage reference portfolio, such as the TS431Q series.

TS4436AICT 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:: ±0.5%

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

TS4436AICT FAQ

1.How can I place an order for TS4436AICT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4436AICT 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 TS4436AICT reliable?

The price and inventory of TS4436AICT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4436AICT is usually 5 days.

3.What payment methods are accepted for TS4436AICT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4436AICT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4436AICT?

TS4436AICT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4436AICT 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 TS4436AICT?

For technical support, including TS4436AICT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4436AICT requirements.

6.How does Aetrix verify that TS4436AICT is sourced from the original manufacturer or authorized distributors?

All TS4436AICT 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 TS4436AICT meets industry standards.

7.What is the process for return or replacement of TS4436AICT?

All TS4436AICT units undergo pre-shipment inspection (PSI). If there is an issue with TS4436AICT, 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 TS4436AICT part is unused and in its original packaging.

Return procedure for TS4436AICT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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