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Analog Devices Inc./Maxim Integrated LM4040AEM3-2.5-T
- Part No.:
- LM4040AEM3-2.5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AEM3-2.5-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
LM4040AEM3-2.5-T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse-breakdown voltage across 60μA–15mA shunt current and is used in high-accuracy analog signal conditioning and ADC/DAC reference circuits.
For engineers reviewing the LM4040AEM3-2.5-T datasheet, LM4040AEM3-2.5-T pinout, LM4040AEM3-2.5-T application, or LM4040AEM3-2.5-T equivalent, key selection criteria include initial voltage tolerance (±2.5mV at +25°C), wide operating current range, low dynamic impedance (≤0.8Ω), no external capacitor requirement, and extended temperature grade suitability for industrial and automotive power management systems.
Technical Context
The LM4040AEM3-2.5-T uses bandgap-based shunt regulation to maintain a precise 2.500V reverse breakdown voltage without requiring forward bias or external components. Its internal laser-trimmed resistor network ensures 0.1% initial accuracy, and its temperature compensation architecture limits drift to ≤±100ppm/°C over –40°C to +125°C.
It operates as a two-terminal device with cathode-anode polarity, sinking current from a source resistor to regulate voltage across its terminals. Stability is maintained under capacitive loads up to 1µF and across full shunt current range (60μA–15mA) without oscillation or external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2.5mV at +25°C - defines reference level for 12-bit+ ADCs and precision sensor interfaces |
| Initial Accuracy | 0.1% (±2.5mV) - enables single-point calibration elimination in factory-trimmed systems |
| Temp Coefficient | ±100ppm/°C max - contributes ≤±25mV drift over full –40°C to +125°C range |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sensor nodes and high-current reference buffering |
| Dynamic Impedance | ≤0.8Ω at 1mA - ensures <1mV output shift under 1mA load transients |
| Wideband Noise | 35µVRMS (10Hz–10kHz) - suitable for 16-bit SAR ADC reference without additional filtering |
| Long-Term Stability | 120ppm over 1000h - predicts <0.012% output drift after one year of continuous operation |
Pinout & Package
LM4040AEM3-2.5-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to supply rail via series resistor |
| 2 (–) | Anode | Reference ground node; common return for load and shunt current |
| 3 (N.C.) | No Connection | Must not be bonded; electrically isolated - tie to pin 2 only if mechanical stability required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - enables placement in space-constrained portable and wearable PCBs |
| No output capacitor required | Stable with any capacitive load up to 1µF - eliminates BOM cost and layout area for decoupling cap |
| Extended temperature grade | –40°C to +125°C operation - qualified for under-hood automotive and industrial control environments |
| Low 35µVRMS noise | 10Hz–10kHz bandwidth - avoids noise-induced quantization error in precision data acquisition |
| Laser-trimmed accuracy | 0.1% initial tolerance - reduces system-level calibration overhead in production test |
Applications
| Portable Medical Sensors | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Battery-powered glucose meter with 16-bit ADC measuring electrochemical cell voltage. IC Role / Device Role / Timing Role: Precision 2.500V shunt reference for ADC VREF input, rejecting supply ripple and thermal drift. Use Value: Enables ±0.5mV absolute measurement accuracy over –20°C to +50°C ambient without recalibration. | Use Scenario: 4–20mA loop-powered transmitter conditioning analog sensor signals in factory automation. IC Role / Device Role / Timing Role: Stable reference for 24-bit ΣΔ ADC and DAC feedback path in isolated I/O modules. Use Value: Maintains <0.01% full-scale error across –40°C to +85°C operating range, meeting SIL-2 functional safety margin. |
| Automotive Cabin Control Units | Test & Measurement Equipment |
Use Scenario: HVAC controller monitoring thermistor and pressure sensor outputs in vehicle cabin modules. IC Role / Device Role / Timing Role: Primary voltage reference for microcontroller's internal ADC and external precision op-amp signal chains. Use Value: Survives 125°C junction temperature during prolonged engine-off solar soak, preserving calibration integrity. | Use Scenario: Benchtop multimeter front-end using dual-slope integration with 24-bit resolution. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for integrator capacitor charging and zero-reference comparison. Use Value: Contributes <0.005% of total measurement uncertainty budget, supporting 6½-digit display accuracy. |
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 | Adjustable 1.24V–18V output; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 | Requires two external resistors for 2.5V setting; higher minimum cathode current (80μA) | Choose when design flexibility or higher voltage options are needed; verify layout compatibility with different pinout |
| ADR3425ARJZ-R7 | Fixed 2.5V; 0.1% accuracy; 30ppm/°C tempco; SOT23-5 (with enable pin) | 5-pin package adds enable control but increases board area; lower noise (12µVRMS) | Prefer when ultra-low tempco or shutdown capability is critical; requires redesign for 5-pin footprint |
Compared with TLVH431ACDBVR and ADR3425ARJZ-R7, LM4040AEM3-2.5-T offers smallest footprint, true two-terminal simplicity, and guaranteed –40°C to +125°C operation without enable logic-making it optimal for space- and reliability-critical embedded references where fixed 2.5V is acceptable.
Availability
LM4040AEM3-2.5-T is available at Aetrix Electronics and suitable for industrial process controls, portable medical devices, and automotive cabin electronics requiring stable component supply with long lifecycle assurance.
Supply support for LM4040AEM3-2.5-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 designs high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and consumer applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, high-reliability systems demanding tight initial accuracy and extended temperature operation.
FAQ
What is the guaranteed operating temperature range for LM4040AEM3-2.5-T?
The LM4040AEM3-2.5-T is specified and guaranteed over –40°C to +125°C ambient temperature. This extended grade (denoted by "E" in the part number) makes it suitable for under-hood automotive, industrial motor drives, and outdoor equipment where high-temperature reliability is essential. The device maintains 2.500V ±2.5mV accuracy at +25°C and meets all electrical specifications across the full range.
Does LM4040AEM3-2.5-T require an external output capacitor for stability?
No, LM4040AEM3-2.5-T does not require an external output capacitor. It is internally compensated and remains stable with any capacitive load from 0 to 1µF. This eliminates the need for additional passive components, reduces PCB area, and simplifies design-especially valuable in battery-powered and miniaturized systems where LM4040AEM3-2.5-T is commonly deployed.
What is the minimum shunt current required for LM4040AEM3-2.5-T to maintain regulation?
The LM4040AEM3-2.5-T requires a minimum shunt current of 65μA (typical) to maintain regulation within specification. At –40°C, the minimum may rise to 70μA. Designers must ensure the series resistor and supply voltage combination always delivers ≥65μA across the full temperature and load range. Below this threshold, output voltage accuracy degrades significantly.
How does the pin configuration of LM4040AEM3-2.5-T differ from standard SOT23 voltage references?
LM4040AEM3-2.5-T uses a 3-pin SC70 package with pins labeled (+), (–), and N.C. Pin 3 is unconnected and must remain floating or be tied to pin 2 (anode); it is not a functional terminal. Unlike many SOT23 references with cathode/anode/adjust or enable pins, LM4040AEM3-2.5-T is strictly two-terminal-simplifying layout but requiring careful attention to the N.C. pin handling per Maxim's datasheet guidance.
Can LM4040AEM3-2.5-T be used in place of LM4040AIM3-2.5+T?
LM4040AEM3-2.5-T and LM4040AIM3-2.5+T share identical electrical specs (0.1% accuracy, 2.500V, 100ppm/°C), but differ in temperature grade and package: LM4040AEM3-2.5-T is SC70-3 rated for –40°C to +125°C, while LM4040AIM3-2.5+T is SOT23-3 rated for –40°C to +85°C. They are not pin-compatible due to different footprints. Substitution requires PCB layout revision and thermal validation for high-temp operation.
LM4040AEM3-2.5-T 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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040AEM3-2.5-T FAQ
1.How can I place an order for LM4040AEM3-2.5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEM3-2.5-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 LM4040AEM3-2.5-T reliable?
The price and inventory of LM4040AEM3-2.5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEM3-2.5-T is usually 5 days.
3.What payment methods are accepted for LM4040AEM3-2.5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEM3-2.5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEM3-2.5-T?
LM4040AEM3-2.5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEM3-2.5-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 LM4040AEM3-2.5-T?
For technical support, including LM4040AEM3-2.5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEM3-2.5-T requirements.
6.How does Aetrix verify that LM4040AEM3-2.5-T is sourced from the original manufacturer or authorized distributors?
All LM4040AEM3-2.5-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 LM4040AEM3-2.5-T meets industry standards.
7.What is the process for return or replacement of LM4040AEM3-2.5-T?
All LM4040AEM3-2.5-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEM3-2.5-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 LM4040AEM3-2.5-T part is unused and in its original packaging.
Return procedure for LM4040AEM3-2.5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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