My Inquiry
My Account
Texas Instruments LM4040D20IDBZRG4
- Part No.:
- LM4040D20IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D20IDBZRG4.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,775
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040D20IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.048 V output with ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μVRMS wideband noise, and stable operation from 45 μA to 15 mA cathode current in the SOT-23-3 (DBZ) package. It serves as a compact, capacitor-free reference for high-resolution ADCs and sensor signal conditioning in industrial field transmitters.
For engineers reviewing the LM4040D20IDBZRG4 datasheet, LM4040D20IDBZRG4 pinout, LM4040D20IDBZRG4 application, or LM4040D20IDBZRG4 equivalent, key selection considerations include its D-grade tolerance over –40°C to +85°C, low dynamic impedance (<1.1 Ω), thermal hysteresis of 0.08%, and compatibility with all capacitive loads without external stabilization.
Technical Context
The LM4040D20IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048 V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon design achieves grade-specific accuracy and temperature stability without requiring external components.
It features low dynamic impedance (0.3–1.1 Ω), wide operating current range (45 μA to 15 mA), and guaranteed stability with any capacitive load - eliminating need for output capacitance. The device is characterized for industrial temperature operation (–40°C to +85°C) and exhibits 120 ppm long-term stability after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables exact 12-bit full-scale alignment in 2.048 V reference systems (e.g., 0–2.048 V ADC input range) |
| Initial Accuracy | ±1.0% max at 25°C (D grade); defines worst-case DC offset in calibration-critical circuits |
| Temp. Coefficient | 150 ppm/°C max; contributes ≤ ±0.198% error over –40°C to +85°C ambient range |
| Wideband Noise | 35 μVRMS (10 Hz–10 kHz); supports <16-bit ENOB in precision data acquisition front-ends |
| Min. Cathode Current | 45 μA typical; allows ultra-low-power operation in battery-powered sensor nodes |
| Dynamic Impedance | ≤1.1 Ω at 1 mA; ensures minimal output voltage shift under varying load current transients |
| Thermal Hysteresis | 0.08% max; limits repeatability error after thermal cycling between –40°C and +125°C |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks current to maintain 2.048 V across anode–cathode |
| Anode (Pin 2) | Common reference ground terminal | Typically tied to system ground; forms return path for cathode current |
| NC (Pin 3) | No internal connection | Must be left floating or connected to anode per EMI mitigation guidance in high-noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates reliably with any capacitive load (0–∞), removing BOM cost and layout constraints of output bypass caps |
| Micropower operation | 45 μA minimum cathode current enables use in energy-harvesting and 10-year battery applications |
| Low noise performance | 35 μVRMS noise supports high-fidelity analog signal chains without added filtering overhead |
| Grade-selectable accuracy | D-grade (±1.0%) provides optimal cost/performance balance for non-calibrated industrial monitoring |
| Extended temp support | Specified from –40°C to +85°C; validated for deployment in outdoor metering and factory automation |
Applications
| Industrial Field Transmitter | Energy Infrastructure Metering |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with onboard ADC and microcontroller. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048 V reference for 12-bit SAR ADC and DAC feedback path. Use Value: Enables ratiometric measurement against 2.048 V full-scale, eliminating gain drift errors in analog front-end. |
Use Scenario: Polyphase electricity meter with isolated current/voltage sensing and metrology SoC. IC Role / Device Role / Timing Role: Precision reference for anti-aliasing filter biasing and ADC reference in Class 0.2 metering ICs. Use Value: Maintains <0.2% total error budget across temperature and lifetime, meeting IEC 62053-21 requirements. |
| Analog Input Module | Precision Audio Signal Conditioning |
Use Scenario: Modular PLC analog input card accepting ±10 V, 0–20 mA, and thermocouple inputs. IC Role / Device Role / Timing Role: Shared reference for multiplexed instrumentation amplifier gain-setting and ADC conversion. Use Value: Ensures channel-to-channel gain matching <0.1% and eliminates reference-induced crosstalk. |
Use Scenario: High-fidelity audio ADC front-end in studio-grade microphone preamp with DC-coupled signal path. IC Role / Device Role / Timing Role: Low-noise reference for bipolar op-amp biasing and ADC reference in 24-bit delta-sigma converters. Use Value: 35 μVRMS noise avoids audible hiss; 0.08% thermal hysteresis prevents DC offset drift during warm-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C20IDBZR | 2.048 V, ±0.5% (C grade), 75 ppm/°C, SOT-23-3, 60 μVRMS noise | Higher accuracy and lower drift, but higher noise; requires tighter layout for noise-sensitive designs | Select when ±0.5% initial tolerance and <100 ppm/°C drift are mandatory, and noise can be managed externally. |
| MAX6002EUR+T | 2.048 V, ±0.2% (B grade), 100 ppm/°C, SOT-23-3, 40 μVRMS noise, 10 μA min current | Lower minimum current and tighter tolerance, but higher noise and narrower temp range (–40°C to +85°C only) | Prefer for ultra-low-power sensor nodes needing <10 μA operation and ±0.2% accuracy, where 40 μVRMS noise is acceptable. |
Compared with TL4050C20IDBZR and MAX6002EUR+T, the LM4040D20IDBZRG4 offers the lowest noise (35 μVRMS) and widest usable current range (45 μA–15 mA), making it optimal for cost-sensitive industrial systems prioritizing signal integrity over tight initial tolerance.
Availability
LM4040D20IDBZRG4 is available at Aetrix Electronics and suitable for industrial field transmitters, energy infrastructure metering, and analog input modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM4040D20IDBZRG4 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 specializing in analog, embedded processing, and power management technologies, serving industrial, automotive, and communications markets.
The LM4040 series was designed for precision, low-power, and space-constrained applications - particularly in industrial sensing, data acquisition, and portable instrumentation where shunt topology simplifies design and improves reliability.
FAQ
What is the operating temperature range for the LM4040D20IDBZRG4?
The LM4040D20IDBZRG4 is specified for industrial temperature operation from –40°C to +85°C. This range is validated per TI's characterization data for the "I" suffix variant (LM4040D20I), and applies directly to the LM4040D20IDBZRG4, which uses the DBZ (SOT-23-3) package and carries the "I" temperature grade designation.
Does the LM4040D20IDBZRG4 require an output capacitor?
No, the LM4040D20IDBZRG4 is stable with all capacitive loads and does not require an output capacitor. Its internal design ensures unconditional stability - a key advantage over series references that mandate specific output capacitance for phase margin control. This eliminates BOM line items and PCB area in space-constrained layouts.
What is the minimum cathode current needed for regulation in the LM4040D20IDBZRG4?
The LM4040D20IDBZRG4 requires a minimum cathode current of 45 μA (typical) to maintain regulation. At 25°C, the datasheet specifies 45–75 μA typical range; over full temperature (–40°C to +85°C), the maximum required minimum is 80 μA. Below this threshold, the device exits regulation and output voltage collapses.
How does the LM4040D20IDBZRG4 compare to the A-grade version (LM4040A20IDBZRG4)?
The LM4040D20IDBZRG4 has ±1.0% initial accuracy and 150 ppm/°C temperature coefficient, while the LM4040A20IDBZRG4 offers ±0.1% accuracy and 100 ppm/°C drift. Both share identical noise (35 μVRMS), dynamic impedance, and package. Choose the D-grade for cost-sensitive industrial applications where ±1% tolerance is acceptable; select A-grade for metrology or calibration equipment.
Is Pin 3 (NC) on the LM4040D20IDBZRG4 required to be left unconnected?
Pin 3 is internally unconnected and may be left floating. However, TI recommends connecting it to the anode (Pin 2) in high-EMI environments - such as near switching power supplies or transformers - to reduce noise coupling into the reference node. This connection does not affect regulation but improves noise immunity in noisy industrial settings.
LM4040D20IDBZRG4 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- 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:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D20IDBZRG4 FAQ
1.How can I place an order for LM4040D20IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D20IDBZRG4 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 LM4040D20IDBZRG4 reliable?
The price and inventory of LM4040D20IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D20IDBZRG4 is usually 5 days.
3.What payment methods are accepted for LM4040D20IDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D20IDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040D20IDBZRG4?
LM4040D20IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D20IDBZRG4 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 LM4040D20IDBZRG4?
For technical support, including LM4040D20IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D20IDBZRG4 requirements.
6.How does Aetrix verify that LM4040D20IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All LM4040D20IDBZRG4 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 LM4040D20IDBZRG4 meets industry standards.
7.What is the process for return or replacement of LM4040D20IDBZRG4?
All LM4040D20IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D20IDBZRG4, 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 LM4040D20IDBZRG4 part is unused and in its original packaging.
Return procedure for LM4040D20IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D20IDBZRG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
