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STMicroelectronics TS4041EILT-1.2
- Part No.:
- TS4041EILT-1.2
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TS4041EILT-1.2.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,064
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Product details
Overview
TS4041EILT-1.2 from STMicroelectronics is a 1.225 V, ±2% precision micropower shunt voltage reference in SOT23-3 package, operating from 65 µA min current over -40°C to +85°C, with 150 ppm/°C tempco and 0.25–0.5 Ω static impedance-used for accurate biasing in battery-powered SMPS feedback loops.
For engineers reviewing the TS4041EILT-1.2 datasheet, TS4041EILT-1.2 pinout, TS4041EILT-1.2 application, or TS4041EILT-1.2 equivalent, key selection criteria include ultra-low quiescent current, tight initial tolerance at 25°C, capacitive-load stability, and industrial temperature performance without series pass transistor overhead.
Technical Context
The TS4041EILT-1.2 functions as a two-terminal shunt reference, sinking cathode current to maintain 1.225 V across its terminals. It requires an external current-limiting resistor and operates stably with up to 100 µF capacitive loads-no series capacitor needed for phase margin.
Its 150 ppm/°C max temperature coefficient and <2.5 mV current-induced voltage shift (for Ik = 1 mA to 12 mA) enable predictable error budgeting in analog signal chains where supply headroom is constrained and thermal gradients exist.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V typical; ±2% initial accuracy at 25°C ensures ≤24.5 mV absolute error in precision ADC reference or op-amp bias networks. |
| Operating Current | 65 µA max at 25°C; enables operation from high-value resistive dividers in energy-harvesting or coin-cell systems. |
| Tempco | 150 ppm/°C max; contributes ≤18.6 mV drift over full -40°C to +85°C range, critical for unregulated ambient sensing nodes. |
| Static Impedance | 0.25–0.5 Ω; minimizes load-regulation error (<0.5 mV per 1 mA load change), supporting dynamic current-sink applications. |
| Noise Density | 200 nV/√Hz (10 Hz–10 kHz); low enough for 12-bit SAR ADC references without additional filtering. |
| Long-Term Stability | 120 ppm over 1000 hrs; supports calibration retention in portable instrumentation with infrequent recalibration cycles. |
Pinout & Package
SOT23-3L plastic micropackage (JEDEC MO-178AA), 2.9 mm × 2.64 mm × 1.12 mm body, lead-free, ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground return path | Connected to system GND; carries full cathode current; must be low-impedance to avoid ground bounce errors. |
| Cathode (Pin 2) | Reference output node | Provides stable 1.225 V when biased with external resistor; sinks current into this pin to regulate voltage. |
| NC (Pin 3) | No connection | Internally unconnected; left floating or tied to GND per layout best practice to reduce parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low operating current | 65 µA max enables use in 10-year battery-powered sensors with >1 MΩ bias resistors. |
| Capacitive-load stability | Stable with 0–100 µF output capacitance eliminates need for isolation resistors in LDO feedback paths. |
| Industrial temperature range | -40°C to +85°C operation supports deployment in outdoor metering and automotive cabin electronics. |
| Low static impedance | 0.25–0.5 Ω reduces load-induced voltage shift to <0.5 mV, preserving accuracy under varying sink conditions. |
Applications
| Battery Charger Feedback | Portable Instrumentation Reference |
|---|---|
Use Scenario: Precision voltage sensing in single-cell Li-ion charger IC feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V setpoint for error amplifier comparison. Use Value: ±2% initial tolerance and 150 ppm/°C tempco ensure charge termination voltage stays within ±30 mV over temperature and lifetime. | Use Scenario: Reference source for handheld multimeter's 12-bit ADC front-end. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for ratiometric measurement against internal DAC. Use Value: 200 nV/√Hz noise and 120 ppm long-term stability support 0.1% measurement repeatability without recalibration. |
| SMPS Output Regulation | IoT Sensor Node Bias |
Use Scenario: Secondary-side voltage reference in isolated flyback converter for USB-C PD adapters. IC Role / Device Role / Timing Role: Cathode-connected to optocoupler LED anode; regulates feedback current proportional to output voltage. Use Value: 0.25–0.5 Ω static impedance ensures <0.3 mV regulation error despite optocoupler CTR variation and aging. | Use Scenario: Power rail reference for ultra-low-power environmental sensor ASIC in smart agriculture node. IC Role / Device Role / Timing Role: Provides stable bias for analog front-end amplifiers and ADC reference during intermittent wake-up cycles. Use Value: 65 µA max operating current extends coin-cell life beyond 5 years while maintaining ±2% accuracy at cold start (-40°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5 V fixed output; 1% initial tolerance; 90 ppm/°C tempco; 80 µA min operating current | Requires resistor divider for 1.225 V derivation; higher current demand limits ultra-low-power use | Select when 2.5 V reference suffices or when tighter tempco outweighs voltage mismatch penalty |
| LM4040CIM3-ADJ | Adjustable output (1.235–10 V); 0.5% initial tolerance; 100 ppm/°C tempco; 60 µA min current | Needs two external resistors; adds layout area and resistor tolerance error to final accuracy | Select when design requires programmable reference voltage or tighter initial tolerance than ±2% |
Compared with TLVH431ACDBVR and LM4040CIM3-ADJ, TS4041EILT-1.2 delivers exact 1.225 V without external resistors, lowest quiescent current, and optimized stability for space-constrained, battery-limited designs-even if it trades off some tempco and initial tolerance.
Availability
TS4041EILT-1.2 is available at Aetrix Electronics and suitable for battery chargers, portable instrumentation, switch-mode power supplies, and IoT sensor nodes requiring stable component supply with guaranteed long-term sourcing.
Supply support for TS4041EILT-1.2 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS4041 belongs to ST's precision analog reference product line, engineered specifically for ultra-low-power, space-constrained applications where shunt topology offers superior simplicity and reliability versus series references.
FAQ
What is the minimum cathode current required for regulation at -40°C?
The TS4041EILT-1.2 requires ≥70 µA cathode current across the full industrial temperature range (-40°C to +85°C) to maintain regulation. At -40°C, this exceeds the 65 µA typical value at 25°C due to increased bandgap-related leakage; design must ensure bias resistor delivers ≥70 µA even at worst-case low temperature and supply voltage.
Can TS4041EILT-1.2 drive a 10 µF ceramic capacitor directly?
Yes-TS4041EILT-1.2 is explicitly characterized for stability with 0–100 µF capacitive loads, including ceramic types. No series isolation resistor is needed, unlike many older shunt references. This simplifies layout in SMPS feedback networks and eliminates ESR-dependent phase margin concerns.
How does the 150 ppm/°C temperature coefficient translate to voltage error at +85°C?
Over a 125°C span (-40°C to +85°C), 150 ppm/°C yields a maximum drift of 18.75 mV (1.225 V × 125 × 150 × 10⁻⁶). Combined with ±2% initial error (±24.5 mV), total worst-case deviation remains within ±43.3 mV-suitable for 10-bit systems but may require trimming in 12-bit+ applications.
Is the NC pin (Pin 3) safe to connect to ground?
Yes-Pin 3 is internally unconnected and may be tied to ground without electrical impact. Doing so improves mechanical robustness and reduces susceptibility to noise coupling in high-density layouts; ST's recommended footprint shows Pin 3 grounded in evaluation designs.
TS4041EILT-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TS4041EILT-1.2 FAQ
1.How can I place an order for TS4041EILT-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for TS4041EILT-1.2 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 TS4041EILT-1.2 reliable?
The price and inventory of TS4041EILT-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4041EILT-1.2 is usually 5 days.
3.What payment methods are accepted for TS4041EILT-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4041EILT-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS4041EILT-1.2?
TS4041EILT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS4041EILT-1.2 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 TS4041EILT-1.2?
For technical support, including TS4041EILT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4041EILT-1.2 requirements.
6.How does Aetrix verify that TS4041EILT-1.2 is sourced from the original manufacturer or authorized distributors?
All TS4041EILT-1.2 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 TS4041EILT-1.2 meets industry standards.
7.What is the process for return or replacement of TS4041EILT-1.2?
All TS4041EILT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with TS4041EILT-1.2, 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 TS4041EILT-1.2 part is unused and in its original packaging.
Return procedure for TS4041EILT-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS4041EILT-1.2 Tags
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