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Analog Devices Inc./Maxim Integrated LM4041DIM3-1.2+T
- Part No.:
- LM4041DIM3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041DIM3-1.2+T.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,579
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Product details
Overview
LM4041DIM3-1.2+T from Maxim Integrated is a precision 1.225V two-terminal shunt voltage reference in SOT23-3 package, rated for -40°C to +85°C operation, with 1.0% initial accuracy, 150ppm/°C max temperature coefficient, and 60µA–12mA operating current range-used in portable power monitoring and ADC reference circuits.
For engineers reviewing the LM4041DIM3-1.2+T datasheet, LM4041DIM3-1.2+T pinout, LM4041DIM3-1.2+T application, or LM4041DIM3-1.2+T equivalent, key selection criteria include guaranteed 1.225V output tolerance over temperature, no-output-capacitor stability, low 20µVRMS noise (10Hz–10kHz), and compatibility with high-impedance sensing nodes in battery-powered systems.
Technical Context
The LM4041DIM3-1.2+T implements a bandgap-based shunt reference architecture, maintaining a stable 1.225V reverse breakdown voltage across its anode and cathode terminals when biased with 60µA–12mA reverse current. It behaves electrically like a precision Zener diode with low dynamic impedance (≤2.0Ω at 1mA).
No external capacitor is required for stability, and it tolerates arbitrary capacitive loads without oscillation. Its BiCMOS process ensures long-term stability of 120ppm over 1000 hours and supports operation up to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V fixed reverse breakdown voltage; maintains ±12mV tolerance over full -40°C to +85°C range for D-grade accuracy. |
| Initial Accuracy | ±1.0% (max) at +25°C; corresponds to ±12.25mV absolute error, defining baseline calibration uncertainty. |
| Tempco | 150ppm/°C (max); contributes ±15.6mV additional error over full temperature range, critical for wide-temp industrial designs. |
| Operating Current | 60µA to 12mA shunt current range; enables ultra-low-power sensor biasing and high-current reference buffering. |
| Noise (10Hz–10kHz) | 20µVRMS; limits resolution in 16-bit+ ADC references and precision analog front-ends. |
| Dynamic Impedance | ≤2.0Ω at 1mA; ensures minimal voltage shift under load transients, supporting stable feedback in regulator loops. |
| Long-Term Stability | 120ppm over 1000 hours; defines drift budget for calibration-critical instrumentation and medical devices. |
Pinout & Package
LM4041DIM3-1.2+T uses the industry-standard 3-pin SOT23-3 surface-mount package (1.7mm × 2.9mm × 1.3mm), optimized for space-constrained PCB layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connected to system ground or low-impedance return path; serves as reference voltage sink point. |
| 2 (−) | Cathode (negative terminal) | Provides 1.225V output node; connected to supply rail via series resistor to establish shunt current. |
| 3 (N.C.) | No-connect terminal | Must be left floating or tied to Pin 2; not internally bonded-leaving unconnected avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.225V reference | Enables direct replacement of 1.2V logic-level references without scaling resistors in low-voltage microcontroller ADCs. |
| No output capacitor required | Reduces BOM count and board area in wearables and hearing aids where every mm² matters and layout parasitics dominate stability. |
| Capacitive load tolerance | Allows direct connection to ADC input capacitors or op-amp feedback networks without phase-margin compensation. |
| 120ppm/1000h long-term drift | Supports 10-year field calibration intervals in utility metering and industrial sensor transmitters. |
| BiCMOS process technology | Delivers lower leakage and tighter matching than CMOS-only references, improving accuracy at sub-100µA operating currents. |
Applications
| Battery Voltage Monitoring | Portable Medical Sensors |
|---|---|
|
Use Scenario: Real-time Li-ion cell voltage measurement in smart battery packs with integrated fuel gauging ICs. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V reference for 12-bit SAR ADCs sampling battery voltage under varying load and temperature. Use Value: Enables ±0.5% state-of-charge accuracy over -20°C to +60°C ambient, meeting UL2054 safety compliance thresholds. |
Use Scenario: Low-power ECG front-end in disposable patch monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision voltage reference for instrumentation amplifier gain-setting and ADC reference in analog signal chain. Use Value: Delivers 20µVRMS noise floor compatible with 100nV-level biopotential signals, preserving diagnostic SNR. |
| Industrial 4–20mA Transmitters | Smart Energy Meters |
|
Use Scenario: Loop-powered 4–20mA current transmitter for pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Stable shunt reference establishing precise current-sense threshold in HART-compatible analog output stage. Use Value: Maintains <±0.1% full-scale error over -40°C to +85°C, satisfying IEC 61000-6-2 immunity requirements. |
Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for polyphase energy calculation. IC Role / Device Role / Timing Role: Primary reference for 24-bit sigma-delta ADC measuring phase voltage in Class 0.2 metering ICs. Use Value: 120ppm/1000h drift meets ANSI C12.20 long-term stability requirement for 20-year meter lifetime. |
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 | 2.5V adjustable reference (min 1.24V), 0.5% initial accuracy, 92ppm/°C tempco, SOT23-3 | Requires external resistor divider for 1.225V output; higher minimum cathode current (80µA) | Select when system already uses TLVH431 family and needs flexibility to scale reference voltage. |
| MAX6008AEUR+T | 1.25V fixed reference, 0.2% initial accuracy, 50ppm/°C tempco, SOT23-3 | Tighter accuracy and lower tempco but higher cost; limited to -40°C to +85°C same as LM4041DIM3-1.2+T | Select when 1.25V output is acceptable and metrology-grade stability is required in compact footprint. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041DIM3-1.2+T offers exact 1.225V output with proven robustness in high-capacitance ADC interfaces and lower cost for D-grade accuracy, while trading off tempco and long-term drift for price-sensitive industrial designs.
Availability
LM4041DIM3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial 4–20mA transmitters, and smart energy meters requiring stable component supply across multi-year production cycles.
Supply support for LM4041DIM3-1.2+T 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The LM4041 series delivers micropower shunt references optimized for space-constrained, battery-operated systems needing stable voltage references without external components.
FAQ
What is the output voltage tolerance of LM4041DIM3-1.2+T over its full operating temperature range?
The LM4041DIM3-1.2+T has a guaranteed output voltage of 1.225V with ±1.0% initial accuracy at +25°C and a maximum temperature coefficient of 150ppm/°C. Over -40°C to +85°C, its total tolerance is ±1.98% (±24.1mV), calculated as ±1.0% ±150ppm/°C × 65°C. This value is confirmed in the device's Electrical Characteristics table under "Reverse Breakdown Voltage Tolerance" for D-grade parts.
Does LM4041DIM3-1.2+T require an external output capacitor for stability?
No, LM4041DIM3-1.2+T does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or op-amp feedback networks. This is explicitly stated in the General Description and Applications Information sections of the official datasheet.
What is the minimum operating current for LM4041DIM3-1.2+T, and why is it important?
The LM4041DIM3-1.2+T requires a minimum shunt current of 60µA to maintain regulation and specified accuracy. Below this threshold, the reference voltage deviates significantly due to insufficient bias current in the bandgap core. This value is critical when designing high-impedance source resistor networks for battery-powered systems where quiescent current must be minimized.
Can LM4041DIM3-1.2+T be used in place of a Zener diode in existing designs?
Yes, LM4041DIM3-1.2+T can directly replace low-voltage Zener diodes (e.g., 1.2V types) in shunt regulator or reference applications. It offers superior initial accuracy (±1.0% vs typical ±5% for Zeners), lower tempco, and guaranteed performance over temperature-without requiring changes to PCB layout or external components.
What is the function of Pin 3 on LM4041DIM3-1.2+T, and how should it be handled?
Pin 3 on LM4041DIM3-1.2+T is labeled N.C. (No Connect) and must be left floating or tied to Pin 2 (cathode). It is not internally bonded; connecting it elsewhere may introduce noise or leakage paths. This requirement is documented in the Pin Description section and Figure 3 of the datasheet, and applies identically across all LM4041 SOT23-3 variants including LM4041DIM3-1.2+T.
LM4041DIM3-1.2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4041DIM3-1.2+T FAQ
1.How can I place an order for LM4041DIM3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041DIM3-1.2+T 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 LM4041DIM3-1.2+T reliable?
The price and inventory of LM4041DIM3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041DIM3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4041DIM3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DIM3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041DIM3-1.2+T?
LM4041DIM3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041DIM3-1.2+T 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 LM4041DIM3-1.2+T?
For technical support, including LM4041DIM3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DIM3-1.2+T requirements.
6.How does Aetrix verify that LM4041DIM3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4041DIM3-1.2+T 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 LM4041DIM3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4041DIM3-1.2+T?
All LM4041DIM3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DIM3-1.2+T, 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 LM4041DIM3-1.2+T part is unused and in its original packaging.
Return procedure for LM4041DIM3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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