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Texas Instruments LM4040C20IDBZR
- Part No.:
- LM4040C20IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C20IDBZR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,305
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Product details
Overview
LM4040C20IDBZR from Texas Instruments is a precision 2.048V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a stable voltage reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040C20IDBZR datasheet, LM4040C20IDBZR pinout, LM4040C20IDBZR application, or LM4040C20IDBZR equivalent, key selection criteria include output tolerance at 25°C and over temperature, minimum operating current, dynamic impedance, noise performance, and thermal hysteresis in industrial ambient conditions.
Technical Context
The LM4040C20IDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves grade-C accuracy without external components or output capacitors.
It delivers low dynamic impedance (≤0.9Ω at 1mA), tight thermal hysteresis (0.08%), and long-term stability (120ppm after 1000 hours), enabling high-accuracy measurements in data acquisition systems where supply headroom is constrained and load capacitance varies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal - matches standard 12-bit DAC full-scale reference and enables exact binary-scaled measurement resolution. |
| Initial Accuracy | ±0.5% at 25°C - ensures ≤10.24mV absolute error before temperature or aging effects. |
| Temp Coefficient | 100ppm/°C max - contributes ≤6.5mV drift over –40°C to 85°C industrial range. |
| Min Cathode Current | 45μA typical - supports ultra-low-power sensor interfaces and battery-operated instrumentation. |
| Noise (10Hz–10kHz) | 35μVRMS - limits added uncertainty to <0.0017% of output, critical for 16-bit+ ADCs. |
| Dynamic Impedance | ≤0.9Ω at 1mA - minimizes output voltage shift under varying load current transients. |
| Thermal Hysteresis | 0.08% - guarantees repeatable voltage after thermal cycling, essential for calibration-critical systems. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input | Connects to regulated supply rail; sinks all reference current plus load current - sets operating point via series resistor. |
| Anode (Pin 2) | Common ground reference | Must be connected to system ground; defines 0V reference for output voltage measurement. |
| NC (Pin 3) | No internal connection | Float or tie to anode per TI EMI guidance; no electrical function but affects layout routing and thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load stability | No output capacitor required - eliminates BOM cost and layout sensitivity to PCB parasitics. |
| Wide operating current range | 45μA to 15mA - accommodates both micropower sensor front-ends and higher-current precision buffers. |
| Extended temperature rating | –40°C to 85°C - qualified for industrial control, factory automation, and outdoor metering environments. |
| Low long-term drift | 120ppm after 1000h - reduces need for field recalibration in deployed instrumentation. |
| EMI robustness | Pin 3 optional anode tie - mitigates noise coupling in high-noise switch-mode power supply proximity. |
Applications
| Industrial Data Acquisition | Smart Field Transmitter |
|---|---|
Use Scenario: High-resolution ADC reference in PLC analog input modules measuring 4–20mA loop signals. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V基准 for 12-bit SAR ADC conversion. Use Value: Enables ±0.5 LSB total unadjusted error budget by contributing <0.0017% noise and <0.5% initial tolerance. | Use Scenario: Reference source in loop-powered 4–20mA transmitter with HART modulation. IC Role / Device Role / Timing Role: Precision shunt reference powering internal circuitry while defining current-loop scaling. Use Value: Maintains 4–20mA accuracy over –40°C to 70°C ambient with <6.5mV tempco-induced drift. |
| Energy Infrastructure Metering | Automotive Battery Monitoring |
Use Scenario: Voltage reference for polyphase energy meter ICs performing RMS voltage/current calculation. IC Role / Device Role / Timing Role: Stable 2.048V reference for metrology ADCs sampling grid voltage waveforms. Use Value: Delivers <0.08% thermal hysteresis and 35μVRMS noise - critical for Class 0.2 metering compliance. | Use Scenario: Reference for cell-voltage monitoring in 12V automotive battery management systems. IC Role / Device Role / Timing Role: Shunt reference supplying accurate scaling to multi-channel ADC measuring 0–5V cell ranges. Use Value: Operates reliably at 85°C under hood, with 45μA min current enabling low-quiescent monitoring during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | Adjustable 1.24V reference; requires two external resistors; 2% initial accuracy; 100ppm/°C tempco. | Used where programmable output or lower voltage is needed; less accurate out-of-box than LM4040C20IDBZR. | Select TLV431ACDBVR only when adjustable output or cost-driven BOM reduction outweighs fixed 2.048V precision. |
| MAX6008AEUR+T | Fixed 2.048V; ±0.2% initial accuracy; 75ppm/°C tempco; SC70-3 package; 60μA min current. | Better accuracy and tempco, but higher minimum current limits ultra-low-power use cases. | Choose MAX6008AEUR+T when tighter initial spec justifies higher operating current and SC70 footprint compatibility. |
Compared with TLV431ACDBVR and MAX6008AEUR+T, LM4040C20IDBZR offers the optimal balance of fixed 2.048V precision, micropower operation (45μA), SOT-23-3 compatibility, and industrial temperature support - making it preferred for cost-sensitive, space-constrained, and battery-aware designs requiring binary-aligned reference voltage.
Availability
LM4040C20IDBZR is available at Aetrix Electronics and suitable for industrial data acquisition, smart field transmitters, energy metering, and automotive battery monitoring requiring stable component supply and consistent parametric performance across production lots.
Supply support for LM4040C20IDBZR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in data acquisition, sensor conditioning, and industrial control systems where space, power, and stability are critical.
FAQ
What is the maximum operating temperature range for LM4040C20IDBZR?
The LM4040C20IDBZR is characterized for operation from –40°C to +85°C ambient temperature. This industrial temperature range is explicitly specified in the device's ordering suffix "I" and confirmed in Section 4 (Device Comparison Table) and Section 6.6 (Electrical Characteristics) of the TI datasheet. Operation beyond 85°C is not guaranteed and may violate recommended operating conditions.
Does LM4040C20IDBZR require an output capacitor for stability?
No, LM4040C20IDBZR does not require an output capacitor. As stated in the Features section and Detailed Description (Section 7.3), it is stable with all capacitive loads and needs no external capacitor for operation - a key advantage over many series references and older shunt devices. This simplifies layout and reduces BOM count.
What is the minimum cathode current needed for LM4040C20IDBZR to regulate properly?
The LM4040C20IDBZR requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation, as specified in Section 6.6 Electrical Characteristics. At full temperature range (–40°C to 85°C), the maximum minimum current is 80μA. Designers must ensure the series resistor supplies ≥80μA across worst-case input voltage and temperature.
How does the pin configuration of LM4040C20IDBZR differ from other LM4040 variants?
LM4040C20IDBZR uses the DBZ (SOT-23-3) package with Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC. This matches all LM4040xI/DBZ variants. The NC pin has no internal connection but may be tied to the anode for EMI mitigation - a design choice unique to this 3-pin variant versus 5-pin SC70 or TO-92 packages.
Is LM4040C20IDBZR compatible with lead-free reflow soldering processes?
Yes, LM4040C20IDBZR is RoHS-compliant and qualified for standard lead-free reflow soldering per JEDEC J-STD-020. Its SOT-23-3 (DBZ) package supports peak reflow temperatures up to 260°C, as documented in TI's packaging information and thermal metrics (Section 6.4 and Mechanical Information).
LM4040C20IDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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):
- 2.048V
- 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:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C20IDBZR FAQ
1.How can I place an order for LM4040C20IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C20IDBZR 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 LM4040C20IDBZR reliable?
The price and inventory of LM4040C20IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C20IDBZR is usually 5 days.
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LM4040C20IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C20IDBZR 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 LM4040C20IDBZR?
For technical support, including LM4040C20IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C20IDBZR requirements.
6.How does Aetrix verify that LM4040C20IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040C20IDBZR 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 LM4040C20IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040C20IDBZR?
All LM4040C20IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C20IDBZR, 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 LM4040C20IDBZR part is unused and in its original packaging.
Return procedure for LM4040C20IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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