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Analog Devices Inc./Maxim Integrated LM4040CEX3-5.0
- Part No.:
- LM4040CEX3-5.0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CEX3-5.0.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:459
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Product details
Overview
LM4040CEX3-5.0 from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.5% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse-breakdown voltage with 60μA–15mA shunt current capability and low 28μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy analog sensing and ADC reference in space-constrained industrial and portable systems.
For engineers reviewing the LM4040CEX3-5.0 datasheet, LM4040CEX3-5.0 pinout, LM4040CEX3-5.0 application, or LM4040CEX3-5.0 equivalent, key selection criteria include its fixed 5.000V output, SC70-3 footprint compatibility, extended temperature range, shunt current regulation behavior, and absence of required output capacitance-critical for low-power, high-reliability embedded designs.
Technical Context
The LM4040CEX3-5.0 uses bandgap-based shunt architecture to maintain a precise 5.000V reverse breakdown voltage across its anode and cathode terminals. Its internal laser-trimmed resistor network ensures 0.5% initial accuracy at +25°C, while temperature compensation maintains stability over –40°C to +125°C.
It operates as a two-terminal device requiring only external series resistance to regulate shunt current between 60μA and 15mA. With no need for output capacitors and tolerance for any capacitive load, it simplifies layout and eliminates stability concerns in battery-powered and thermally demanding applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±25mV at +25°C - defines reference level for precision ADCs, DACs, and comparators |
| Initial Accuracy | ±0.5% (±25mV) - enables single-point calibration in measurement systems without trimming |
| Temp Coefficient | ±100ppm/°C max - contributes ≤±12.5mV drift over full –40°C to +125°C range |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sleep modes and high-current regulation without external biasing |
| Dynamic Impedance | 0.5Ω to 1.1Ω at 1mA - ensures minimal output voltage shift under load transients |
| Wideband Noise | 80μVRMS (10Hz–10kHz) - suitable for 12-bit to 14-bit data acquisition systems |
| Long-Term Stability | 120ppm (1000h) - guarantees reference integrity over product lifetime without recalibration |
Pinout & Package
LM4040CEX3-5.0 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 remain floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode | Positive terminal; connects to system ground or low-side reference node in shunt configuration |
| 2 (–) | Cathode | Negative terminal; connects to regulated voltage rail via series resistor; carries full shunt current |
| 3 (N.C.) | No Connection | Must be left unconnected or shorted to pin 2; not internally bonded - floating connection avoids parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - enables placement in dense PCB layouts for portable and wearable electronics |
| No output capacitor required | Fully stable with zero or arbitrary capacitive loads - eliminates BOM cost and layout risk from external COUT |
| Extended temperature range | –40°C to +125°C operation - qualified for industrial control, automotive under-hood, and harsh-environment monitoring |
| Low quiescent current capability | 60μA minimum operating current - supports micropower sensor nodes and battery-backed systems |
| High shunt current tolerance | 15mA maximum shunt current - accommodates high-precision references needing >10mA sink capability |
Applications
| Portable Instrumentation | Industrial Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and battery-powered operation. IC Role / Device Role / Timing Role: Precision 5.000V shunt reference for ADC full-scale calibration and offset correction. Use Value: Enables ±0.5% absolute accuracy without factory trim, extending battery life via 60μA min current operation. | Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20mA loop signals. IC Role / Device Role / Timing Role: Stable 5.000V reference for isolated ΣΔ ADC front-end and sensor excitation circuitry. Use Value: Maintains <±12.5mV total drift over –40°C to +125°C ambient, ensuring field calibration validity for 10+ years. |
| Automotive Body Control | Medical Sensor Interface |
Use Scenario: In-cabin temperature/humidity sensor node with CAN bus reporting. IC Role / Device Role / Timing Role: Reference for microcontroller's internal ADC measuring conditioned sensor outputs. Use Value: AEC-Q100-compliant variant availability (e.g., LM4040CEM3-5.0/V+T) supports automotive qualification path. | Use Scenario: Portable ECG monitor with low-noise analog front-end and rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Low-noise 5.000V reference for instrumentation amplifier gain-setting and ADC reference. Use Value: 80μVRMS noise floor supports ≥14-bit ENOB performance without additional filtering or averaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C50IDBZR | 5.0V output, 0.5% accuracy, SOT23-3, ±100ppm/°C, but requires ≥75μA min current and has higher 120μVRMS noise | Less suitable for ultra-low-power wake-up circuits due to higher minimum current and noise | Select TL4050C50IDBZR only if SOT23-3 footprint is mandatory and noise budget allows ≥120μVRMS |
| ADR3450ARJZ-R7 | 5.0V output, 0.1% accuracy, SC70-5, ±10ppm/°C, but three-terminal series architecture requiring supply voltage >5.5V | Not a drop-in replacement: different topology, pin count, and power requirements limit use to new designs with headroom | Choose ADR3450ARJZ-R7 when highest accuracy and lowest drift are critical, and board space allows SC70-5 and extra supply margin |
Compared with TL4050C50IDBZR and ADR3450ARJZ-R7, LM4040CEX3-5.0 offers optimal balance of SC70-3 size, 60μA ultra-low start-up current, and proven stability without external capacitance-making it preferred for retrofitting into existing compact shunt-reference layouts.
Availability
LM4040CEX3-5.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and automotive body control systems requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for LM4040CEX3-5.0 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 industrial, medical, and communications applications, emphasizing high accuracy, low power, and robust reliability.
LM4040CEX3-5.0 belongs to the LM4040 family of micropower shunt voltage references engineered for space-constrained, high-stability applications where traditional three-terminal references are impractical.
FAQ
What is the guaranteed operating temperature range for LM4040CEX3-5.0?
The LM4040CEX3-5.0 is specified and guaranteed over –40°C to +125°C. This extended range is confirmed by the "E" grade suffix in the part number and validated in the Electrical Characteristics tables for the 5.000V variant. It supports deployment in industrial control cabinets, automotive under-hood modules, and outdoor sensor enclosures without derating.
Does LM4040CEX3-5.0 require an external output capacitor for stability?
No, LM4040CEX3-5.0 does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load-including zero capacitance-eliminating layout sensitivity and reducing BOM count. This is explicitly stated in the General Description and Applications Information sections of the datasheet.
What is the minimum shunt current needed for LM4040CEX3-5.0 to maintain regulation?
The LM4040CEX3-5.0 requires a minimum shunt current of 60μA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table for the 5.000V variant under "Minimum Operating Current" (IRMIN) for grades A/B/C. Below this threshold, output voltage accuracy degrades beyond guaranteed limits.
How does the pin configuration of LM4040CEX3-5.0 differ from standard three-terminal references?
LM4040CEX3-5.0 is a two-terminal shunt reference: pin 1 is anode (+), pin 2 is cathode (–), and pin 3 is N.C. (no internal connection). Unlike three-terminal series references, it sinks current through the cathode to regulate voltage across its terminals-requiring only one external series resistor and no separate supply rail.
Can LM4040CEX3-5.0 be used in place of LM4040CIM3-5.0?
Yes, LM4040CEX3-5.0 can replace LM4040CIM3-5.0 in most designs, provided the SC70-3 footprint is acceptable. Both share identical electrical specs: 5.000V output, 0.5% accuracy, ±100ppm/°C tempco, and –40°C to +125°C operation. The only difference is package-SC70-3 vs. SOT23-3-so mechanical layout review is required before substitution.
LM4040CEX3-5.0 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CEX3-5.0 FAQ
1.How can I place an order for LM4040CEX3-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEX3-5.0 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 LM4040CEX3-5.0 reliable?
The price and inventory of LM4040CEX3-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEX3-5.0 is usually 5 days.
3.What payment methods are accepted for LM4040CEX3-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEX3-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEX3-5.0?
LM4040CEX3-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEX3-5.0 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 LM4040CEX3-5.0?
For technical support, including LM4040CEX3-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEX3-5.0 requirements.
6.How does Aetrix verify that LM4040CEX3-5.0 is sourced from the original manufacturer or authorized distributors?
All LM4040CEX3-5.0 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 LM4040CEX3-5.0 meets industry standards.
7.What is the process for return or replacement of LM4040CEX3-5.0?
All LM4040CEX3-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEX3-5.0, 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 LM4040CEX3-5.0 part is unused and in its original packaging.
Return procedure for LM4040CEX3-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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