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Analog Devices Inc./Maxim Integrated LM4041DEM3-1.2+
- Part No.:
- LM4041DEM3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041DEM3-1.2+.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
LM4041DEM3-1.2+ from Maxim Integrated is a precision 1.225V two-terminal shunt voltage reference in SOT23-3 package, rated for -40°C to +125°C operation, with 1.0% initial accuracy, 150ppm/°C max temperature coefficient, and 60µA–12mA shunt current range-used for stable biasing in portable power management circuits.
For engineers reviewing the LM4041DEM3-1.2+ datasheet, LM4041DEM3-1.2+ pinout, LM4041DEM3-1.2+ application, or LM4041DEM3-1.2+ equivalent, key selection criteria include guaranteed extended-temperature performance, no-output-capacitor stability, low dynamic impedance (≤2.0Ω), and compatibility with high-impedance sensing nodes in battery-powered systems.
Technical Context
The LM4041DEM3-1.2+ implements a bandgap-based shunt reference architecture that maintains a fixed 1.225V reverse breakdown voltage across its terminals when biased with 60µA–12mA cathode-to-anode current. It operates without external stabilization capacitors and tolerates arbitrary capacitive loads.
Its internal BiCMOS process enables low 20µVRMS wideband noise (10Hz–10kHz) and long-term stability of 120ppm over 1000 hours. The D-grade variant specifies ±12mV reverse voltage tolerance at +25°C and ±24mV overtemperature tolerance in the -40°C to +125°C range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±12mV (±1.0%) tolerance at +25°C ensures predictable ADC/DAC reference level setting |
| Temperature Coefficient | 150ppm/°C max; guarantees ≤±24mV total drift over -40°C to +125°C for industrial sensor calibration |
| Shunt Current Range | 60µA to 12mA; supports low-power microcontroller wake-up references and high-current analog front-end biasing |
| Dynamic Impedance | ≤2.0Ω at 1mA/120Hz; minimizes output voltage shift under load transients in precision measurement circuits |
| Wideband Noise | 20µVRMS (10Hz–10kHz); preserves signal integrity in 12-bit+ data acquisition systems |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial control environments |
Pinout & Package
LM4041DEM3-1.2+ uses the standard 3-pin SOT23-3 surface-mount package (1.7mm × 2.9mm × 1.3mm), compatible with automated assembly and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to system ground or low-impedance return path; forms cathode-to-anode current loop with pin 2 |
| 2 (−) | Cathode / Negative Terminal | Reference output node; voltage measured between pins 2 and 1 defines 1.225V regulation point |
| 3 (N.C.) | No Connect | Must be left floating or tied to pin 2; not internally connected-ensures no parasitic leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.225V Reference | Eliminates external resistor dividers in 1.2V system rails and matches common LDO feedback thresholds |
| No Output Capacitor Required | Reduces BOM count and PCB area in space-constrained designs like wearables and IoT sensors |
| Stable with Any Capacitive Load | Enables direct connection to ADC input capacitors or op-amp integrators without phase-margin risk |
| 120ppm Long-Term Stability | Supports 10-year field reliability in uncalibrated instrumentation without periodic recalibration |
| BiCMOS Process Construction | Delivers low noise and tight tempco while maintaining robust ESD immunity (≥2kV HBM) |
Applications
| Battery-Powered Sensor Nodes | Industrial 4–20mA Transmitters |
|---|---|
Use Scenario: Low-power environmental sensor (temperature/humidity) operating from coin cell for multi-year deployment. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V excitation for bridge sensors and ADC reference for 12-bit SAR conversion. Use Value: 60µA minimum operating current enables >10-year battery life; 150ppm/°C tempco ensures <0.5% full-scale error across -40°C to +85°C ambient. | Use Scenario: Loop-powered transmitter conditioning thermocouple or RTD signals into 4–20mA output. IC Role / Device Role / Timing Role: Precision voltage reference for DAC and op-amp gain-setting resistors in analog signal chain. Use Value: Guaranteed -40°C to +125°C operation supports harsh factory-floor environments; ±24mV overtemperature tolerance meets IEC 61000-4-2 immunity requirements. |
| Portable Medical Devices | Automotive Cabin Sensors |
Use Scenario: Handheld pulse oximeter requiring clinical-grade accuracy and FDA-compliant long-term stability. IC Role / Device Role / Timing Role: Reference source for analog front-end amplifiers and ADCs measuring photodiode current ratios. Use Value: 20µVRMS noise prevents SNR degradation in sub-100nA current measurements; 120ppm/1000h drift satisfies ISO 13485 lifetime validation. | Use Scenario: Occupancy or air quality sensor mounted near HVAC ducts inside vehicle cabin. IC Role / Device Role / Timing Role: Stable bias reference for MEMS pressure and CO₂ sensor signal conditioning ICs. Use Value: Extended temperature rating eliminates need for local thermal derating; SOT23-3 footprint allows placement directly adjacent to sensor die. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZR | Adjustable 1.24V reference; 0.5% initial accuracy; 90ppm/°C tempco; requires external resistors for 1.225V setup | Higher design flexibility but adds two precision resistors and layout area; less suitable for ultra-low-power sleep modes | Select TLVH431IDBZR only if adjustable output or tighter tempco is required and board space permits resistor network |
| ADR3412ARJZ-R7 | 1.200V fixed output; 0.1% initial accuracy; 30ppm/°C tempco; 3-pin SOT23 package; higher 120µA min current | Superior accuracy and stability but incompatible output voltage; unsuitable where 1.225V matching is mandatory (e.g., legacy LDO feedback) | Choose ADR3412ARJZ-R7 only when system redesign allows 1.200V reference and lowest possible drift is critical |
Compared with TLVH431IDBZR and ADR3412ARJZ-R7, LM4041DEM3-1.2+ uniquely delivers exact 1.225V output with extended-temperature qualification, zero external components, and micropower operation-making it optimal for drop-in replacement in existing 1.225V-referenced designs.
Availability
LM4041DEM3-1.2+ is available at Aetrix Electronics and suitable for portable medical devices, industrial 4–20mA transmitters, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4041DEM3-1.2+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The LM4041 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems requiring stable 1.225V references across extreme temperatures.
FAQ
What is the guaranteed operating temperature range for LM4041DEM3-1.2+?
The LM4041DEM3-1.2+ is fully specified and guaranteed over -40°C to +125°C. This extended temperature range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet, making it suitable for under-hood automotive and industrial control applications where ambient temperatures exceed +85°C.
Does LM4041DEM3-1.2+ require an external output capacitor for stability?
No, LM4041DEM3-1.2+ does not require an external output capacitor. The device is inherently stable with any capacitive load, including direct connection to ADC input capacitors or op-amp inputs. This capability is explicitly stated in the General Description and Applications Information sections and verified by the "OUTPUT IMPEDANCE vs. FREQUENCY" plot showing stable impedance down to 0.1Hz.
What is the pin configuration and terminal function of LM4041DEM3-1.2+?
LM4041DEM3-1.2+ uses a 3-pin SOT23-3 package with pin 1 as anode (+), pin 2 as cathode (−), and pin 3 as no-connect (N.C.). Pin 3 must remain unconnected or be tied to pin 2 per the Pin Description table. This configuration is identical across all LM4041 variants and validated in the Top View diagram and Pin Configuration section.
How does the 1.0% initial accuracy of LM4041DEM3-1.2+ compare to other grades in the family?
LM4041DEM3-1.2+ belongs to the D-grade variant, specifying ±1.0% initial accuracy (±12mV at +25°C), which is the widest tolerance among LM4041 grades. In contrast, A-grade offers ±0.1%, B-grade ±0.2%, and C-grade ±0.5%. All grades share the same 1.225V nominal output and SOT23-3 packaging, enabling cost-optimized selection where tighter accuracy is unnecessary.
What is the maximum shunt current and power dissipation limit for LM4041DEM3-1.2+?
LM4041DEM3-1.2+ supports a shunt current range of 60µA to 12mA. Its absolute maximum reverse current is 20mA, and continuous power dissipation in the SOT23-3 package is 320mW at +70°C, derating by 4.01mW/°C above that temperature. These limits are defined in the Absolute Maximum Ratings table and ensure safe operation under worst-case load and ambient conditions.
LM4041DEM3-1.2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- SOT-23-3
LM4041DEM3-1.2+ FAQ
1.How can I place an order for LM4041DEM3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041DEM3-1.2+ 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 LM4041DEM3-1.2+ reliable?
The price and inventory of LM4041DEM3-1.2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041DEM3-1.2+ is usually 5 days.
3.What payment methods are accepted for LM4041DEM3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DEM3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041DEM3-1.2+?
LM4041DEM3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041DEM3-1.2+ 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 LM4041DEM3-1.2+?
For technical support, including LM4041DEM3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DEM3-1.2+ requirements.
6.How does Aetrix verify that LM4041DEM3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4041DEM3-1.2+ 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 LM4041DEM3-1.2+ meets industry standards.
7.What is the process for return or replacement of LM4041DEM3-1.2+?
All LM4041DEM3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DEM3-1.2+, 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 LM4041DEM3-1.2+ part is unused and in its original packaging.
Return procedure for LM4041DEM3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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