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Texas Instruments LM4040B50IDCKR
- Part No.:
- LM4040B50IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040B50IDCKR.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,777
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Product details
Overview
LM4040B50IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 5.0 V nominal output, ±0.2% initial accuracy (B grade), 100 ppm/°C temperature coefficient, 35 μVRMS wideband noise, and stable operation from 45 μA to 15 mA cathode current. It serves as a compact, low-drift voltage基准 in analog signal chains for industrial sensors and portable data-acquisition systems.
For engineers reviewing the LM4040B50IDCKR datasheet, LM4040B50IDCKR pinout, LM4040B50IDCKR application, or LM4040B50IDCKR equivalent, key selection criteria include its SC-70-5 package footprint, no-output-capacitor-required stability, thermal hysteresis of 0.08%, and extended–40°C to 85°C operating range - all critical for high-accuracy, space-constrained embedded designs.
Technical Context
The LM4040B50IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 5.0 V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components, and its low dynamic impedance (≤0.9 Ω at 1 mA) ensures minimal load regulation error under varying current conditions.
It delivers stable performance across capacitive loads up to 10 nF without oscillation, and its 100 ppm/°C tempco enables ≤±0.52% total output drift over –40°C to +85°C. Long-term stability is rated at 120 ppm after 1000 hours at 25°C, supporting reliable calibration in field-deployed instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V nominal; fixed value set by internal Zener-zap trimming - eliminates need for external feedback resistors. |
| Initial Accuracy | ±0.2% at 25°C (B grade); corresponds to ±10 mV tolerance - suitable for 12-bit ADC references. |
| Tempco | 100 ppm/°C max over –40°C to +85°C; contributes ≤±0.52% drift across full range - enables high-stability sensor excitation. |
| Noise (10 Hz–10 kHz) | 35 μVRMS at IZ = 100 μA; low enough to avoid degrading 16-bit SAR ADC effective resolution. |
| Min Cathode Current | 45 μA typical; allows ultra-low-power operation in battery-powered IoT nodes and sleep-mode circuits. |
| Dynamic Impedance | 0.9 Ω max at 1 mA; ensures <1 mV output shift per 1 mA load change - critical for precision current-sense amplifiers. |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycling; guarantees repeatable voltage after thermal stress - essential for recalibration-critical test equipment. |
Pinout & Package
LM4040B50IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00 mm × 1.25 mm, optimized for high-density PCB layouts. The package includes two NC pins to support variant compatibility and EMI mitigation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage reference node | Connects to regulated supply rail; sinks current to maintain 5.0 V across anode–cathode - defines reference potential. |
| Anode (Pin 1) | Common return / ground reference | Typically tied to system ground; forms the reference return path - must be low-impedance for noise immunity. |
| NC (Pins 4, 5) | No internal connection | May be left floating or grounded per layout best practices; TI recommends grounding near noisy sources to reduce EMI coupling. |
| Pin 2* | Internal Zener reference node | Must float or connect to anode; ties internal Zener structure to common - required for stable operation in high-noise environments. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external resistor network - reduces BOM count and layout sensitivity in compact sensor modules. |
| Stable with all capacitive loads | Enables direct connection to ADC input caps or op-amp feedback networks without compensation - simplifies design validation. |
| 45 μA minimum operating current | Supports operation in ultra-low-power wake-up circuits and energy-harvesting systems where supply current is tightly constrained. |
| SC-70-5 package | 0.65 mm pitch, 2.00 mm × 1.25 mm footprint - fits within 1.5 mm × 1.5 mm board area, ideal for wearables and miniaturized transmitters. |
| –40°C to +85°C operation | Qualified for industrial ambient environments - supports deployment in factory automation, building controls, and outdoor metering. |
Applications
| Industrial Sensor Calibration | Portable Data-Acquisition Front-End |
|---|---|
Use Scenario: Precision calibration of 4–20 mA loop-powered pressure and temperature transmitters in oil & gas field instruments. IC Role / Device Role / Timing Role: Shunt reference providing stable 5.0 V excitation for bridge sensors and reference for 16-bit delta-sigma ADCs. Use Value: ±0.2% initial accuracy and 100 ppm/°C tempco ensure <0.1% total error over temperature - meets SIL-2 functional safety margin requirements. |
Use Scenario: Battery-operated handheld multimeter with dual-range voltage measurement and auto-ranging logic. IC Role / Device Role / Timing Role: Primary voltage reference for both 200 mV and 2 V full-scale ranges in the front-end signal chain. Use Value: 45 μA min current and 35 μVRMS noise enable >100 dB SNR at 100 kSPS - preserves 5½-digit resolution during continuous sampling. |
| Energy Infrastructure Monitoring | Automotive Cabin Climate Control |
Use Scenario: Voltage monitoring in smart electricity meters tracking grid harmonics and power quality metrics. IC Role / Device Role / Timing Role: Reference for anti-aliasing filter cutoff tuning and ADC reference in metrology-grade sampling subsystems. Use Value: Thermal hysteresis of 0.08% prevents calibration drift after repeated thermal cycling in unventilated meter enclosures - sustains Class 0.5 accuracy over 10-year life. |
Use Scenario: Cabin air quality sensor module with CO₂, VOC, and humidity sensing in premium automotive HVAC systems. IC Role / Device Role / Timing Role: Stable bias source for electrochemical gas sensors and reference for ratiometric ADC measurements. Use Value: SC-70-5 footprint and –40°C to +85°C rating allow placement directly on sensor PCB - avoids long traces that degrade noise performance and thermal tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C50IDCKR | ±0.5% initial accuracy, same 100 ppm/°C tempco and SC-70-5 package | Lower-cost option for non-critical 12-bit systems where ±25 mV tolerance is acceptable | Select when cost sensitivity outweighs need for <0.2% calibration traceability |
| REF3050AIDBZR | Series topology, 5.0 V output, ±0.2% accuracy, but requires ≥50 μA supply current and external bypass cap | Higher PSRR (90 dB vs. shunt's inherent rejection), but larger SOT-23-3 footprint and higher quiescent current | Prefer for mixed-signal SoCs with noisy digital supplies where series reference PSRR provides measurable SNR benefit |
Compared with LM4040C50IDCKR, the LM4040B50IDCKR offers tighter initial tolerance for calibration-critical roles; compared with REF3050AIDBZR, it eliminates external capacitance and reduces board area by 30%, though it lacks supply-rejection benefits in digitally noisy environments.
Availability
LM4040B50IDCKR is available at Aetrix Electronics and suitable for industrial sensor calibration, portable data-acquisition front-ends, and energy infrastructure monitoring requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LM4040B50IDCKR 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 50 years of innovation in precision analog ICs and industrial-grade reliability.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in space-constrained industrial and portable instrumentation - prioritizing micropower operation, zero-external-component simplicity, and robust thermal performance.
FAQ
What is the maximum cathode current rating for LM4040B50IDCKR?
The absolute maximum cathode current for LM4040B50IDCKR is 25 mA, per TI's Absolute Maximum Ratings table. However, the recommended operating range is 45 μA to 15 mA. Exceeding 15 mA may increase self-heating beyond thermal design margins, potentially degrading long-term stability and tempco performance in the LM4040B50IDCKR.
Does LM4040B50IDCKR require an output capacitor for stability?
No, LM4040B50IDCKR is inherently stable with all capacitive loads up to at least 10 nF and does not require an output capacitor. This is confirmed in the device description and "Stable with all capacitive loads; no output capacitor required" feature bullet - a key advantage enabling direct connection to ADC input capacitors or op-amp inputs without risk of oscillation in the LM4040B50IDCKR.
What is the thermal hysteresis specification for LM4040B50IDCKR?
The thermal hysteresis of LM4040B50IDCKR is 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to +125°C. This low hysteresis ensures repeatable reference voltage behavior after environmental thermal stress - a critical parameter for field-deployed calibration equipment using the LM4040B50IDCKR.
Can LM4040B50IDCKR operate down to 45 μA cathode current while maintaining spec?
Yes, LM4040B50IDCKR is specified to operate down to 45 μA typical minimum cathode current while maintaining its ±0.2% initial accuracy and 100 ppm/°C tempco over –40°C to +85°C. At this current, output noise remains at 35 μVRMS, and dynamic impedance rises slightly but stays within 0.9 Ω - confirming full-spec operation in ultra-low-power modes of the LM4040B50IDCKR.
Is LM4040B50IDCKR qualified for automotive applications?
No, LM4040B50IDCKR is rated for –40°C to +85°C (industrial temperature grade), not the AEC-Q200-qualified –40°C to +125°C extended range. For automotive cabin climate control or body electronics, TI offers the LM4040B50IDCKRG4 (Q-grade variant), but LM4040B50IDCKR itself is intended for industrial and commercial use only - a distinction critical for compliance in automotive programs using the LM4040B50IDCKR.
LM4040B50IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 95 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LM4040B50IDCKR FAQ
1.How can I place an order for LM4040B50IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B50IDCKR 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 LM4040B50IDCKR reliable?
The price and inventory of LM4040B50IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B50IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040B50IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B50IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B50IDCKR?
LM4040B50IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B50IDCKR 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 LM4040B50IDCKR?
For technical support, including LM4040B50IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B50IDCKR requirements.
6.How does Aetrix verify that LM4040B50IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040B50IDCKR 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 LM4040B50IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040B50IDCKR?
All LM4040B50IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B50IDCKR, 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 LM4040B50IDCKR part is unused and in its original packaging.
Return procedure for LM4040B50IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B50IDCKR Tags
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