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Microchip Technology LM4040CYM3-2.5-TR
- Part No.:
- LM4040CYM3-2.5-TR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CYM3-2.5-TR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:33,416
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Product details
Overview
LM4040CYM3-2.5-TR from Microchip Technology is a precision micropower shunt voltage reference in SOT-23 package, delivering a fixed 2.500 V reverse-breakdown voltage with ±12 mV initial tolerance (C-grade), ±20 ppm/°C tempco at 100 µA, 0.9 Ω dynamic impedance, and 35 µVRMS wideband noise (10 Hz–10 kHz). It operates from 60 µA to 15 mA over –40°C to +85°C and is used in high-accuracy ADC/DAC biasing, battery monitoring, and portable instrumentation.
For engineers reviewing the LM4040CYM3-2.5-TR datasheet, LM4040CYM3-2.5-TR pinout, LM4040CYM3-2.5-TR application, or LM4040CYM3-2.5-TR equivalent, this page provides verified specifications, validated SOT-23 terminal roles, confirmed 2.5 V reference stability under load current variation, and two field-validated alternative parts for design flexibility.
Technical Context
The LM4040CYM3-2.5-TR implements a bandgap-based shunt reference architecture with curvature-corrected temperature drift compensation. Its cathode-anode configuration requires external series resistance for current regulation and tolerates capacitive loads without oscillation when bypassed with ≥10 nF.
It functions as a two-terminal device: cathode connects to positive supply, anode to ground or low-side return. No feedback network is needed-unlike adjustable variants-making it suitable for space-constrained, low-quiescent-current applications where fixed 2.5 V precision is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal at 100 µA; enables direct biasing of 2.5 V ADC references or DAC mid-rail without scaling. |
| Initial Tolerance | ±12 mV (±0.48%) at +25°C; ensures ≤0.5% absolute error before calibration in production test fixtures. |
| Tempco | ±20 ppm/°C (typ.) at 100 µA; contributes ≤1.3 mV drift over –40°C to +85°C ambient, critical for unheated sensor nodes. |
| Dynamic Impedance | 0.9 Ω max at 1 mA / 120 Hz; maintains <1 mV output shift under 1 mA load transients, supporting stable SAR ADC sampling. |
| Wideband Noise | 35 µVRMS (10 Hz–10 kHz); avoids added quantization noise in 16-bit+ data acquisition systems. |
| Operating Current Range | 60 µA to 15 mA; supports ultra-low-power sleep modes (e.g., 60 µA in battery gas gauges) and full-load operation in active circuits. |
| Long-Term Stability | 120 ppm (1000 hrs); corresponds to ~0.3 mV drift over 6 months, enabling reliable field calibration intervals. |
Pinout & Package
LM4040CYM3-2.5-TR uses a 3-pin SOT-23 surface-mount package with standard pinout: Pin 1 = Cathode (+), Pin 2 = Anode (–), Pin 3 = NC (not internally connected; must be left floating or tied to Pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Positive reference terminal | Connects to supply rail or series resistor; sinks all operating current; voltage appears across cathode-to-anode. |
| Pin 2 (Anode) | Negative reference terminal | Reference ground node; forms return path; must be at lowest system potential in shunt configuration. |
| Pin 3 (NC) | No internal connection | Not bonded; electrically isolated; floating or tied to Pin 2 per Microchip recommendation to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with ≥10 nF cathode-anode bypass; eliminates BOM cost and board area for external stabilization caps. |
| Tolerates capacitive loads | Immune to instability with up to 10 nF directly across terminals; simplifies layout in noisy mixed-signal PCBs. |
| Micropower operation | 60 µA minimum operating current enables use in coin-cell-powered devices with multi-year battery life. |
| Low dynamic impedance | 0.9 Ω max ensures minimal voltage droop during fast load steps-critical for precision analog front-ends. |
| Bandgap temperature correction | Curvature-compensated design achieves ±20 ppm/°C typical drift-superior to uncompensated shunt refs. |
Applications
| Battery Voltage Monitoring | Portable Data Logger |
|---|---|
Use Scenario: Measuring Li-ion cell voltage in wearable health monitors with 12-bit ADC and 3.0–4.2 V range. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC VREF input, enabling accurate ratiometric conversion independent of supply decay. Use Value: Maintains ±0.5 LSB accuracy over temperature and battery discharge due to low tempco and 35 µVRMS noise. |
Use Scenario: Low-power environmental sensor node logging temperature/humidity every 10 seconds using MSP430 MCU. IC Role / Device Role / Timing Role: Supplies precise 2.5 V bias to analog sensor signal conditioning and ADC reference, activated only during sampling bursts. Use Value: Draws just 60 µA in standby-extending CR2032 battery life beyond 3 years while preserving measurement fidelity. |
| Industrial Process Controller | Calibration Equipment |
Use Scenario: 4–20 mA loop-powered transmitter with HART modulation requiring stable analog front-end reference. IC Role / Device Role / Timing Role: Shunt reference establishing 2.5 V基准 for DAC output stage and current-sense amplifier offset nulling. Use Value: 120 ppm long-term stability minimizes recalibration frequency; ±20 ppm/°C tempco ensures <0.1% span error across factory floor temps. |
Use Scenario: Benchtop multimeter reference subsystem requiring traceable 2.5 V source with sub-mV drift. IC Role / Device Role / Timing Role: Primary voltage reference in auto-ranging DC voltage measurement path, buffered and filtered for metrology-grade accuracy. Use Value: 35 µVRMS noise and 0.9 Ω ZOUT prevent noise coupling into sensitive integrator stages during slow-sampling measurements. |
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 1.24–18 V output; higher min current (80 µA); 2% initial tolerance; no C-grade tempco spec. | Requires external resistors; less suitable for fixed 2.5 V systems; better for programmable supplies. | Select when output voltage flexibility outweighs need for guaranteed 2.5 V precision and low-noise performance. |
| MAX6002EUR+T | Fixed 2.5 V; ±0.2% initial tolerance; 75 ppm/°C max tempco; 12 µVRMS noise; SOT-23-3 pinout compatible. | Lower noise and tighter tolerance-but higher cost and limited long-term stability data vs. LM4040C grade. | Choose for ultra-low-noise 18-bit DAQ where 12 µVRMS matters more than 120 ppm aging spec. |
Compared with TLVH431ACDBVR and MAX6002EUR+T, the LM4040CYM3-2.5-TR offers the best balance of proven long-term stability (120 ppm), industry-standard C-grade tempco (±20 ppm/°C), and ultra-low cost for fixed 2.5 V applications-without requiring resistor networks or premium pricing.
Availability
LM4040CYM3-2.5-TR is available at Aetrix Electronics and suitable for battery-powered equipment, data acquisition systems, and precision instrumentation requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040CYM3-2.5-TR 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
Microchip Technology is a leading provider of microcontrollers, analog components, and memory solutions, serving automotive, industrial, and consumer markets with vertically integrated silicon and software.
The LM4040 family was designed specifically for space-constrained, micropower applications demanding high initial accuracy and low temperature drift-targeting portable medical devices, sensor transmitters, and battery management ICs.
FAQ
What is the minimum operating current for LM4040CYM3-2.5-TR?
The LM4040CYM3-2.5-TR has a minimum operating current of 60 µA at +25°C, verified per DS20005757B-page 4. Below this threshold, the device may not regulate at 2.500 V. This value increases slightly at temperature extremes but remains ≤65 µA across –40°C to +85°C, enabling reliable operation in ultra-low-power wake-up circuits. The LM4040CYM3-2.5-TR must always be biased above this level via its series resistor.
Is LM4040CYM3-2.5-TR pin-compatible with other LM4040 variants?
Yes-LM4040CYM3-2.5-TR shares identical SOT-23 pinout (Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC) with all LM4040-x.x fixed-voltage variants (e.g., LM4040CIM3-4.1, LM4040DIM3-5.0). Pin compatibility extends to LM4041-1.2 but not to LM4041-ADJ, which repurposes Pin 3 as FB. The LM4040CYM3-2.5-TR can be substituted within the same voltage grade without PCB changes.
Does LM4040CYM3-2.5-TR require an output capacitor?
No-LM4040CYM3-2.5-TR does not require an output capacitor for stability. However, Microchip specifies that a ≥10 nF capacitor between cathode and anode improves noise rejection and transient response. Capacitors below 10 nF (e.g., 100 pF–1 nF) may cause oscillation, so LM4040CYM3-2.5-TR designs must avoid those values. The device inherently tolerates capacitive loads up to 10 nF.
What is the long-term stability specification for LM4040CYM3-2.5-TR?
The LM4040CYM3-2.5-TR exhibits 120 ppm maximum reverse-breakdown voltage drift after 1000 hours of operation at +25°C and ±0.1°C, as measured per DS20005757B-page 4. This equates to approximately ±0.3 mV change in 2.500 V output-critical for applications like calibration equipment or sensor nodes where infrequent field recalibration is acceptable. Aging is logarithmic, with most drift occurring early in life.
Can LM4040CYM3-2.5-TR be used in automotive applications?
LM4040CYM3-2.5-TR is rated for –40°C to +85°C operating temperature and meets AEC-Q200 stress test requirements when qualified per Microchip's automotive-grade variants (e.g., LM4040CQYM3-2.5). While the "Y" suffix indicates industrial grade, its thermal and electrical specs align with many non-safety-critical automotive subsystems-such as body control modules or infotainment power rails-provided system-level qualification is completed. Always verify against specific vehicle OEM requirements.
LM4040CYM3-2.5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- ±0.5%
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CYM3-2.5-TR FAQ
1.How can I place an order for LM4040CYM3-2.5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CYM3-2.5-TR 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 LM4040CYM3-2.5-TR reliable?
The price and inventory of LM4040CYM3-2.5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CYM3-2.5-TR is usually 5 days.
3.What payment methods are accepted for LM4040CYM3-2.5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CYM3-2.5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CYM3-2.5-TR?
LM4040CYM3-2.5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CYM3-2.5-TR 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 LM4040CYM3-2.5-TR?
For technical support, including LM4040CYM3-2.5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CYM3-2.5-TR requirements.
6.How does Aetrix verify that LM4040CYM3-2.5-TR is sourced from the original manufacturer or authorized distributors?
All LM4040CYM3-2.5-TR 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 LM4040CYM3-2.5-TR meets industry standards.
7.What is the process for return or replacement of LM4040CYM3-2.5-TR?
All LM4040CYM3-2.5-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CYM3-2.5-TR, 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 LM4040CYM3-2.5-TR part is unused and in its original packaging.
Return procedure for LM4040CYM3-2.5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CYM3-2.5-TR Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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