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Analog Devices Inc./Maxim Integrated LM4040DIX3-2.5+T
- Part No.:
- LM4040DIX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DIX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,345
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Product details
Overview
LM4040DIX3-2.5+T from Maxim Integrated is a precision 2.500V fixed-output, two-terminal shunt voltage reference in SC70-3 package, featuring ±1.0% initial accuracy, ±150ppm/°C temperature coefficient over –40°C to +85°C, 60μA–15mA operating current range, and 35µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in battery-powered analog signal chains and low-power ADC/DAC biasing.
For engineers reviewing the LM4040DIX3-2.5+T datasheet, LM4040DIX3-2.5+T pinout, LM4040DIX3-2.5+T application, or LM4040DIX3-2.5+T equivalent, key selection criteria include shunt current capability, thermal drift performance in compact layouts, no-output-capacitor stability, and RoHS-compliant SC70 footprint compatibility with space-constrained portable designs.
Technical Context
The LM4040DIX3-2.5+T uses bandgap-based shunt regulation to maintain a precise 2.500V reverse breakdown voltage across its cathode-anode terminals when biased with 60μA–15mA reverse current. Its internal laser-trimmed resistor network ensures grade-D initial tolerance without external trimming.
It operates stably with any capacitive load and requires no output capacitor-unlike series references-due to inherent low dynamic impedance (≤1.1Ω at 1mA) and optimized internal compensation. The device guarantees operation across –40°C to +85°C ambient, with junction temperature limited to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±20mV at +25°C; supports accurate 10-bit+ ADC reference scaling in 3.3V systems |
| Initial Accuracy | ±1.0% (grade D); enables single-point calibration elimination in cost-sensitive instrumentation |
| Tempco | ±150ppm/°C max; contributes ≤±12.5mV drift over –40°C to +85°C ambient |
| Operating Current | 60μA to 15mA; allows ultra-low-power sensor biasing and high-current reference buffering |
| Noise (10Hz–10kHz) | 35µVRMS; preserves SNR in 12-bit data acquisition front-ends |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes output voltage shift under load transients up to 10mA step |
| Long-Term Stability | 120ppm after 1000h; ensures <0.3% reference drift over 5-year product lifetime |
Pinout & Package
LM4040DIX3-2.5+T is housed in a RoHS-compliant, 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. 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 terminal; connects to supply rail through current-setting resistor |
| 2 (–) | Anode | Reference ground node; ties to system GND and load return path |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Enables placement in <2mm² PCB area-critical for wearable and IoT sensor nodes |
| No output capacitor required | Eliminates BOM cost and layout risk associated with capacitor ESR/aging in shunt references |
| Capacitive load tolerance | Stable with >100nF ceramic output capacitance-supports filtering without oscillation |
| Wide shunt current range | Operates down to 60μA quiescent current-extends battery life in always-on monitoring circuits |
| Low 35µVRMS noise | Reduces quantization error in precision 12-bit SAR ADCs without external filtering |
Applications
| Portable, Battery-Powered Equipment | Notebook Computers |
|---|---|
Use Scenario: Reference for fuel-gauge ICs and low-power microcontroller ADCs in handheld medical devices. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.500V reference for analog-to-digital conversion of battery voltage and sensor signals. Use Value: Enables <1% measurement accuracy over full temperature range while consuming <100μA total system current. | Use Scenario: Precision biasing for thermal monitoring diodes and voltage supervisor circuits on notebook mainboards. IC Role / Device Role / Timing Role: Two-terminal shunt reference supplying calibrated 2.500V to comparator inputs for thermal trip detection. Use Value: Delivers consistent threshold voltage across –40°C to +85°C without calibration, reducing firmware complexity. |
| Cell Phones | Industrial Process Controls |
Use Scenario: Reference for RF power amplifier bias control and front-end gain calibration in LTE/5G transceivers. IC Role / Device Role / Timing Role: Stable 2.500V shunt reference used in closed-loop DAC-controlled bias networks. Use Value: Maintains <±15mV output stability during rapid ambient temperature shifts, ensuring PA linearity compliance. | Use Scenario: Reference for 4–20mA loop transmitter DACs in field-mounted pressure and flow sensors. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit DACs generating precise analog output currents. Use Value: Guarantees <0.02% full-scale error contribution over industrial temperature range, meeting IEC 61000-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBVR | Adjustable 1.24V–18V output; 0.5% initial accuracy; higher 100μA min current; SOT23-3 | Requires external resistors for 2.5V setting; less suitable for ultra-low-power (<100μA) apps | Select when adjustable output or higher voltage capability is needed; verify layout for 2.5V resistor network accuracy |
| ADR3425ARJZ-R7 | Fixed 2.5V; 0.1% accuracy; 30ppm/°C tempco; 100μA–10mA range; SOT23-5 | Series topology; requires input capacitor; larger footprint; lower noise (9µVRMS) | Choose for highest precision and lowest drift where board space and power allow series reference architecture |
Compared with TLVH431IDBVR and ADR3425ARJZ-R7, the LM4040DIX3-2.5+T offers the smallest footprint and lowest quiescent current among 2.5V shunt references, but trades off absolute accuracy and thermal stability for size and simplicity-ideal for cost- and space-constrained consumer electronics.
Availability
LM4040DIX3-2.5+T is available at Aetrix Electronics and suitable for portable medical devices, notebook power management subsystems, cellular RF front-ends, and industrial 4–20mA transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040DIX3-2.5+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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated systems where simplicity, small size, and no-output-capacitor operation are critical design requirements.
FAQ
What is the guaranteed operating temperature range for LM4040DIX3-2.5+T?
The LM4040DIX3-2.5+T is specified for operation from –40°C to +85°C ambient temperature. This grade-D variant does not carry the extended +125°C rating found in /E-suffixed versions like LM4040DEX3-2.5+T. Its junction temperature must remain ≤+150°C, requiring thermal derating above +70°C ambient per the SC70 package's 2.90mW/°C derating curve.
Can LM4040DIX3-2.5+T drive a 100nF capacitive load without instability?
Yes, the LM4040DIX3-2.5+T is explicitly designed to remain stable with any capacitive load-including 100nF ceramic capacitors-without requiring an output capacitor. Its internal architecture provides inherent phase margin across all load conditions, eliminating the need for external compensation components that complicate layout and increase BOM count.
What is the minimum shunt current required for LM4040DIX3-2.5+T to maintain regulation?
The LM4040DIX3-2.5+T requires a minimum shunt current (IRMIN) of 45μA to maintain regulation at room temperature, rising to 70μA maximum across its full –40°C to +85°C operating range. Below this threshold, output voltage deviates beyond specification; design must ensure the current-setting resistor maintains ≥70μA even at worst-case low-VS and high-ILOAD.
How does the 1.0% initial accuracy of LM4040DIX3-2.5+T impact system-level calibration?
The ±1.0% initial accuracy of LM4040DIX3-2.5+T translates to ±25mV error at 2.500V, which may require one-time factory calibration in systems targeting <0.5% total measurement error. However, its excellent long-term stability (120ppm after 1000h) and predictable temperature drift (±150ppm/°C) enable software-based compensation using stored coefficients, reducing recurring calibration overhead.
Is pin 3 of LM4040DIX3-2.5+T functional or optional?
Pin 3 of LM4040DIX3-2.5+T is designated N.C. (No Connection) and is not internally bonded. Per the official datasheet, it must be left unconnected or tied directly to pin 2 (anode). Connecting pin 3 to any other net-or leaving it floating without verification-may cause unpredictable behavior or violate qualification testing conditions.
LM4040DIX3-2.5+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040DIX3-2.5+T FAQ
1.How can I place an order for LM4040DIX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DIX3-2.5+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 LM4040DIX3-2.5+T reliable?
The price and inventory of LM4040DIX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DIX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040DIX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DIX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DIX3-2.5+T?
LM4040DIX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DIX3-2.5+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 LM4040DIX3-2.5+T?
For technical support, including LM4040DIX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DIX3-2.5+T requirements.
6.How does Aetrix verify that LM4040DIX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040DIX3-2.5+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 LM4040DIX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040DIX3-2.5+T?
All LM4040DIX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DIX3-2.5+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 LM4040DIX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040DIX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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