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Analog Devices Inc./Maxim Integrated LM4040BEX3-2.5-T
- Part No.:
- LM4040BEX3-2.5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BEX3-2.5-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,348
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Product details
Overview
LM4040BEX3-2.5-T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 100ppm/°C max temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +125°C. It serves as a stable reference in portable battery-powered systems where space and thermal stability are critical.
For engineers reviewing the LM4040BEX3-2.5-T datasheet, LM4040BEX3-2.5-T pinout, LM4040BEX3-2.5-T application, or LM4040BEX3-2.5-T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at low currents, wideband noise (35µVRMS), no-output-capacitor stability, and SC70 footprint compatibility for high-density PCB layouts.
Technical Context
The LM4040BEX3-2.5-T uses a bandgap-based shunt architecture to maintain a precise 2.500V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its laser-trimmed internal resistor network ensures ±0.2% initial accuracy at +25°C, with temperature drift bounded by ±100ppm/°C over –40°C to +125°C.
No external capacitor is required for stability - the device remains stable under any capacitive load due to low dynamic impedance (≤0.8Ω at 1mA) and inherent frequency compensation. It exhibits 35µVRMS wideband noise (10Hz–10kHz) and long-term stability of 120ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V nominal; ±4.0mV (±0.2%) tolerance at +25°C - enables accurate ADC/DAC biasing in 2.5V systems. |
| Tempco | ≤100ppm/°C - ensures ≤±25mV drift over full –40°C to +125°C range, critical for industrial sensor front-ends. |
| Operating Current | 60μA to 15mA - supports ultra-low-power sleep modes and high-current regulation without external components. |
| Dynamic Impedance | ≤0.8Ω at 1mA - minimizes output voltage variation under load transients, improving PSRR in precision analog circuits. |
| Wideband Noise | 35µVRMS (10Hz–10kHz) - low enough for 16-bit+ data acquisition systems without additional filtering. |
| Long-Term Stability | 120ppm over 1000h - predicts <0.012% output shift after one year, supporting calibration-critical instrumentation. |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, enabling placement in space-constrained wearables and IoT nodes. |
Pinout & Package
The LM4040BEX3-2.5-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm). Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode (reverse-bias input) | Connects to higher-potential node; sinks shunt current to maintain 2.500V across terminals. |
| 2 (–) | Anode (reference ground) | Reference return path; forms stable 2.500V potential relative to this terminal. |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2; not internally bonded - floating N.C. avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - reduces PCB real estate by 50% vs. SOT23, ideal for miniaturized portable electronics. |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost, layout risk, and board space for stabilization caps. |
| Guaranteed –40°C to +125°C operation | Validated performance across full industrial temperature range - suitable for automotive under-hood and factory automation sensors. |
| Low 35µVRMS noise | Enables direct use in high-resolution (≥16-bit) analog signal chains without post-regulation filtering. |
| 60μA minimum operating current | Supports micropower designs (e.g., coin-cell-powered devices) while maintaining regulation integrity. |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable 2.5V reference for ADC conversion of analog biosignals. IC Role / Device Role / Timing Role: Shunt voltage reference providing precision 2.500V bias for 16-bit SAR ADCs and low-noise op-amp front-ends. Use Value: ±0.2% initial accuracy and 35µVRMS noise ensure <±1 LSB error in 16-bit measurements across –20°C to +60°C ambient. | Use Scenario: Real-time monitoring of 3.3V/5V rail voltages in notebook power delivery subsystems. IC Role / Device Role / Timing Role: Reference source for microcontroller ADC inputs measuring system supply health and battery charge state. Use Value: SC70-3 size allows placement near VRMs; 100ppm/°C tempco ensures consistent readings across chassis temperature gradients. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: 4–20mA loop-powered field transmitters converting pressure/temperature into standardized current signals. IC Role / Device Role / Timing Role: Precision shunt reference setting gain and offset in analog output stages and sensor excitation circuits. Use Value: Guaranteed –40°C to +125°C operation and 120ppm/1000h stability support 10+ year field deployment without recalibration. | Use Scenario: Revenue-grade electricity meters requiring metrology-grade voltage references for energy calculation accuracy. IC Role / Device Role / Timing Role: Stable 2.500V reference for anti-aliasing filters and sigma-delta ADCs sampling mains voltage waveforms. Use Value: Low 35µVRMS noise and <0.8Ω dynamic impedance minimize measurement uncertainty in Class 0.2 metering standards. |
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 (2.5V–36V) 3-terminal shunt; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 package. | Requires external resistors for 2.5V setting; higher minimum cathode current (80μA); larger footprint than SC70. | Choose when adjustable output or higher voltage capability is needed; avoid if strict 2.500V fixed reference and minimal board area are mandatory. |
| REF3025AIDBZR | 2.5V series reference; 0.2% initial accuracy; 50ppm/°C tempco; 1.5µA quiescent current; SOT23-3. | Series topology requires input >2.5V; cannot sink current like shunt; higher cost and larger dropout headroom needed. | Prefer for ultra-low-quiescent systems where supply margin permits series operation; not drop-in for shunt-based topologies. |
Compared with TLVH431ACDBVR and REF3025AIDBZR, the LM4040BEX3-2.5-T delivers fixed 2.500V precision in the smallest possible footprint with zero external components, making it optimal for space-constrained shunt-regulated designs where simplicity and thermal stability are prioritized over adjustability or ultra-low IQ.
Availability
LM4040BEX3-2.5-T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, industrial process transmitters, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040BEX3-2.5-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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communications applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-operated, and industrial systems demanding high accuracy and wide-temperature reliability without external components.
FAQ
What is the exact reverse breakdown voltage tolerance of LM4040BEX3-2.5-T at +25°C?
The LM4040BEX3-2.5-T has a reverse breakdown voltage of 2.500V with ±4.0mV (±0.2%) tolerance at +25°C, as specified in the Electrical Characteristics table for the B-grade variant. This tight tolerance enables high-accuracy calibration in test equipment and precision data converters without trimming.
Does LM4040BEX3-2.5-T require an external capacitor for stability?
No, the LM4040BEX3-2.5-T does not require an external capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, eliminating the need for output bypass capacitors and simplifying layout in compact designs where board space is constrained.
What is the minimum operating current for LM4040BEX3-2.5-T across its full temperature range?
The LM4040BEX3-2.5-T guarantees stable regulation down to 60μA minimum operating current across –40°C to +125°C. At temperatures outside this range or below 60μA, output voltage may deviate beyond specification limits, so design margins must ensure ≥60μA shunt current under worst-case conditions.
How does the temperature coefficient of LM4040BEX3-2.5-T affect its output over –40°C to +125°C?
The LM4040BEX3-2.5-T has a maximum temperature coefficient of 100ppm/°C. Over the full –40°C to +125°C range (ΔT = 165°C), this results in up to ±16.5mV (±0.66%) total drift from nominal 2.500V - well within the ±0.2% initial tolerance plus tempco budget defined for B-grade devices.
Can LM4040BEX3-2.5-T be used in place of LM4040AIM3-2.5+T?
No - LM4040BEX3-2.5-T and LM4040AIM3-2.5+T differ in accuracy grade (B vs A), temperature range (–40°C to +125°C vs –40°C to +85°C), and package (SC70 vs SOT23). While both provide 2.500V output, the LM4040BEX3-2.5-T offers wider temperature operation but looser initial accuracy (±0.2% vs ±0.1%), and its SC70 footprint is not pin-compatible with SOT23.
LM4040BEX3-2.5-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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:
- ±0.2%
- 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:
- SC-70-3
LM4040BEX3-2.5-T FAQ
1.How can I place an order for LM4040BEX3-2.5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEX3-2.5-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 LM4040BEX3-2.5-T reliable?
The price and inventory of LM4040BEX3-2.5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEX3-2.5-T is usually 5 days.
3.What payment methods are accepted for LM4040BEX3-2.5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEX3-2.5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEX3-2.5-T?
LM4040BEX3-2.5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEX3-2.5-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 LM4040BEX3-2.5-T?
For technical support, including LM4040BEX3-2.5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEX3-2.5-T requirements.
6.How does Aetrix verify that LM4040BEX3-2.5-T is sourced from the original manufacturer or authorized distributors?
All LM4040BEX3-2.5-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 LM4040BEX3-2.5-T meets industry standards.
7.What is the process for return or replacement of LM4040BEX3-2.5-T?
All LM4040BEX3-2.5-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEX3-2.5-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 LM4040BEX3-2.5-T part is unused and in its original packaging.
Return procedure for LM4040BEX3-2.5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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