My Inquiry
My Account
Texas Instruments LM4040B20IDBZTG4
- Part No.:
- LM4040B20IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B20IDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,665
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040B20IDBZTG4 from Texas Instruments is a precision 2.048V shunt voltage reference in SOT-23-3 (DBZ) package, rated for industrial temperature range (–40°C to +85°C), with ±0.2% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a stable reference in high-resolution ADC/DAC biasing and sensor signal conditioning circuits.
For engineers reviewing the LM4040B20IDBZTG4 datasheet, LM4040B20IDBZTG4 pinout, LM4040B20IDBZTG4 application, or LM4040B20IDBZTG4 equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and noise performance, and real-world application context for analog front-end design, portable instrumentation, and industrial data acquisition systems.
Technical Context
The LM4040B20IDBZTG4 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-based architecture uses wafer-level fuse and Zener-zap trimming to achieve B-grade tolerance (±0.2% at 25°C) and low dynamic impedance (≤0.8Ω at 1mA).
It requires no external capacitor, remains stable under all capacitive loads, and delivers consistent performance across 45μA–15mA operating current and –40°C to +85°C ambient temperature. Thermal hysteresis is limited to 0.08%, and long-term stability is 120ppm after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal - exact binary-scaled value optimized for 12-bit ADC full-scale reference alignment |
| Initial Accuracy | ±0.2% max at 25°C - enables ≤1 LSB error in 10-bit systems without calibration |
| Tempco | 100ppm/°C max - ensures <±0.13% drift over –40°C to +85°C industrial range |
| Min Cathode Current | 45μA typical - supports ultra-low-power sensor interfaces and battery-operated designs |
| Wideband Noise | 35μVRMS (10Hz–10kHz) - preserves SNR in precision 16-bit+ data acquisition paths |
| Dynamic Impedance | 0.8Ω max at 1mA - minimizes load-induced voltage shift in varying-current applications |
| Thermal Hysteresis | 0.08% - guarantees repeatable voltage after thermal cycling in field-deployed equipment |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to supply rail; sinks current to regulate voltage at anode node |
| Anode (Pin 2) | Reference output / ground reference | Provides stable 2.048V relative to system ground; must be tied to GND or low-impedance return |
| NC (Pin 3) | No internal connection | Floats electrically; no routing or grounding required - unused terminal in DBZ variant |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load - eliminates BOM cost and layout area for decoupling caps |
| Low micropower consumption | 45μA minimum operating current - extends battery life in portable gas sensors and IoT nodes |
| High PSRR immunity | Dynamic impedance <0.8Ω - rejects supply ripple better than series references in noisy environments |
| Extended temp grade support | Specified over –40°C to +85°C - qualified for industrial control cabinets and outdoor metering |
| Low thermal hysteresis | 0.08% - prevents measurement drift after repeated thermal cycling in HVAC or energy monitoring |
Applications
| Industrial Analog Input Module | Portable Precision Data Logger |
|---|---|
Use Scenario: 16-bit isolated analog input channel measuring 4–20mA loop signals in PLC backplanes. IC Role / Device Role / Timing Role: Shunt reference providing excitation and ADC reference for ratiometric current-to-voltage conversion. Use Value: 2.048V output aligns exactly with 211, eliminating integer rounding in firmware scaling; ±0.2% accuracy maintains <±0.5°C error in RTD measurements. |
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity at 1-sample-per-minute intervals. IC Role / Device Role / Timing Role: Low-current reference for SAR ADC and sensor biasing during active measurement bursts. Use Value: 45μA min current enables operation from coin-cell batteries for >5 years; 35μVRMS noise preserves 14.5ENOB in 100ksps sampling. |
| Field Transmitter Signal Conditioning | Energy Infrastructure Metering |
Use Scenario: Two-wire 4–20mA transmitter housing pressure/flow sensors in hazardous areas. IC Role / Device Role / Timing Role: Primary voltage reference for DAC-controlled current output stage and sensor front-end gain setting. Use Value: 100ppm/°C tempco ensures <±0.25% span error over –40°C to +70°C ambient; NC pin simplifies PCB layout in space-constrained housings. |
Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for ADC and anti-tampering monitoring. IC Role / Device Role / Timing Role: Stable 2.048V reference for polyphase energy measurement ASIC and tamper-detection comparators. Use Value: 0.08% thermal hysteresis prevents calibration drift after solar-heating cycles; 120ppm long-term stability meets IEC 62053-21 Class 0.2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C20IDBZTG4 | ±0.5% initial accuracy, same 2.048V output and DBZ package | Acceptable where 10-bit system resolution suffices; lower cost | Select when budget constraints outweigh need for ≤1 LSB error in 10-bit designs |
| REF3020AIDBZR | 2.048V series reference, 50ppm/°C, 50μA quiescent, SOT-23-3 | Requires output capacitor; higher supply headroom needed | Choose for lower tempco and better PSRR where board space allows capacitor and VIN ≥ 2.7V |
Compared with LM4040C20IDBZTG4, the LM4040B20IDBZTG4 provides tighter accuracy for high-fidelity sensor interfaces; versus REF3020AIDBZR, it offers simpler layout and lower dropout but trades off tempco and PSRR - selection depends on whether shunt topology or series regulation better fits the power architecture.
Availability
LM4040B20IDBZTG4 is available at Aetrix Electronics and suitable for industrial analog input modules, portable precision data loggers, and field transmitter signal conditioning requiring stable component supply and guaranteed long-term sourcing.
Supply support for LM4040B20IDBZTG4 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 and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LM4040 family was engineered for cost-sensitive, space-constrained applications demanding stable voltage references without external components - targeting industrial sensing, portable instrumentation, and energy infrastructure metering.
FAQ
What is the maximum cathode current rating for LM4040B20IDBZTG4?
The absolute maximum cathode current for LM4040B20IDBZTG4 is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA. Operating above 15mA increases self-heating and may degrade long-term stability and tempco performance; sustained currents near 25mA risk exceeding junction temperature limits in standard PCB layouts.
Does LM4040B20IDBZTG4 require an output capacitor?
No, LM4040B20IDBZTG4 does not require an output capacitor. Its internal design ensures stability with all capacitive loads, including direct connection to ADC reference inputs or op-amp feedback networks. This eliminates capacitor-related BOM cost, footprint, and potential phase-margin issues - a key advantage over series references like REF3020.
How does the NC pin (Pin 3) function in LM4040B20IDBZTG4?
In the SOT-23-3 (DBZ) package of LM4040B20IDBZTG4, Pin 3 is designated NC (No Connection) and has no internal bond wire or circuit connection. It must remain unconnected - neither grounded nor routed. TI documentation explicitly states it should float or be left unpopulated; connecting it may introduce parasitic coupling or mechanical stress without functional benefit.
Can LM4040B20IDBZTG4 operate at –40°C to +125°C?
No, LM4040B20IDBZTG4 is characterized only for the industrial temperature range of –40°C to +85°C. For operation up to +125°C, TI specifies the Q-grade variants (e.g., LM4040B20QDBZRG4), which use different wafer processing and screening. Using LM4040B20IDBZTG4 beyond +85°C violates its qualified operating conditions and may result in increased tempco, reduced accuracy, or accelerated long-term drift.
What is the long-term stability specification for LM4040B20IDBZTG4?
The long-term stability of LM4040B20IDBZTG4 is 120ppm after 1000 hours of operation at 25°C and 100μA cathode current. This metric reflects parametric shift due to aging mechanisms and is measured under controlled lab conditions. In real-world applications, actual drift is typically lower when operated within recommended current and temperature ranges, supporting multi-year calibration intervals in field instruments.
LM4040B20IDBZTG4 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- 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
LM4040B20IDBZTG4 FAQ
1.How can I place an order for LM4040B20IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B20IDBZTG4 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 LM4040B20IDBZTG4 reliable?
The price and inventory of LM4040B20IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B20IDBZTG4 is usually 5 days.
3.What payment methods are accepted for LM4040B20IDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B20IDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B20IDBZTG4?
LM4040B20IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B20IDBZTG4 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 LM4040B20IDBZTG4?
For technical support, including LM4040B20IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B20IDBZTG4 requirements.
6.How does Aetrix verify that LM4040B20IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040B20IDBZTG4 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 LM4040B20IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040B20IDBZTG4?
All LM4040B20IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B20IDBZTG4, 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 LM4040B20IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040B20IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B20IDBZTG4 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…
