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Texas Instruments LM4040D30IDBZTG4
- Part No.:
- LM4040D30IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D30IDBZTG4.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
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Product details
Overview
LM4040D30IDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference with a fixed 3.0V output, D-grade (±1.0% initial tolerance, 150ppm/°C tempco), rated for –40°C to 85°C operation, packaged in SOT-23-3 (DBZ), and designed for low-noise analog input modules and portable energy infrastructure systems.
For engineers reviewing the LM4040D30IDBZTG4 datasheet, LM4040D30IDBZTG4 pinout, LM4040D30IDBZTG4 application, or LM4040D30IDBZTG4 equivalent, key selection criteria include cathode current range (45μA–15mA), dynamic impedance (≤1.2Ω), wide-capacitive-load stability, and thermal hysteresis (0.08%).
Technical Context
The LM4040D30IDBZTG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its terminals. Its Zener-zap trimmed reverse breakdown ensures stable 3.0V output under varying load and temperature conditions without requiring external capacitors.
It delivers low wideband noise (35μVRMS), maintains long-term stability (120ppm over 1000h), and exhibits predictable dynamic impedance behavior across its operating current range - critical for high-resolution ADC biasing and sensor excitation circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal; enables direct interface with 3V ADC references and microcontroller VREF inputs. |
| Initial Tolerance | ±1.0% at 25°C; defines worst-case DC offset in calibration-critical signal chains. |
| Tempco | 150ppm/°C max; contributes ≤±0.105% error over –40°C to 85°C ambient range. |
| Cathode Current Range | 45μA to 15mA; supports ultra-low-power sensor nodes and higher-current analog front-ends. |
| Dynamic Impedance | ≤1.2Ω at 1mA; minimizes output voltage shift during transient load changes. |
| Wideband Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition systems. |
| Thermal Hysteresis | 0.08%; limits repeatability error after thermal cycling in field-deployed equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connects to regulated node; sinks current to maintain 3.0V across anode–cathode. |
| Anode (Pin 2) | Common ground reference | Typically tied to system ground; forms return path for cathode current. |
| NC (Pin 3) | No internal connection | Must float or be connected to anode per EMI mitigation guidance in high-noise environments. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load stability | Operates stably with any output capacitance - eliminates need for output capacitor and associated layout constraints. |
| Micropower operation | 45μA minimum cathode current enables battery-powered designs with multi-year runtime. |
| Extended temperature rating | Specified from –40°C to +85°C - suitable for industrial and automotive under-hood applications. |
| Low thermal hysteresis | 0.08% ensures repeatable voltage accuracy after thermal cycling in field-replaceable modules. |
| Zener-zap trimming | Fuse-based wafer-level calibration achieves tight initial tolerance without post-package adjustment. |
Applications
| Industrial Analog Input Module | Energy Infrastructure Sensor Node |
|---|---|
Use Scenario: High-accuracy 4–20mA transmitter with 16-bit DAC and isolated ADC. IC Role / Device Role / Timing Role: Provides stable 3.0V reference for DAC output scaling and ADC full-scale calibration. Use Value: ±1.0% initial tolerance and 150ppm/°C tempco limit total reference error to <±0.25% over full temperature range. | Use Scenario: Battery-powered grid-monitoring sensor measuring voltage, current, and temperature. IC Role / Device Role / Timing Role: Supplies precision bias for current-sense amplifiers and RTD excitation circuits. Use Value: 45μA min cathode current enables >10-year battery life while maintaining 35μVRMS noise floor. |
| Portable Field Transmitter | Precision Audio Level Detection |
Use Scenario: Handheld gas detector with electrochemical sensor and low-power MCU. IC Role / Device Role / Timing Role: References sensor signal conditioning chain and ADC reference input. Use Value: Stable 3.0V output under variable load and temperature ensures consistent sensor sensitivity calibration. | Use Scenario: Studio-grade audio metering circuit detecting RMS level across wide dynamic range. IC Role / Device Role / Timing Role: Sets accurate threshold and scaling for logarithmic envelope detection. Use Value: 35μVRMS noise and <1.2Ω dynamic impedance prevent reference-induced distortion in dBFS calculations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Adjustable 2.5V reference (2.495V ±0.5%), higher min cathode current (1mA), higher dynamic impedance (~0.2Ω typical but not specified max). | Requires external resistor divider for 3.0V; less suitable for ultra-low-power designs due to higher IZ,min. | Select when adjustable output or tighter initial tolerance is required, and power budget allows ≥1mA cathode current. |
| MAX6003EUR+T | Fixed 3.0V shunt reference, A-grade (±0.2%), 75ppm/°C tempco, SOT-23-3, 30μA min cathode current. | Higher accuracy and lower tempco, but limited to –40°C to +85°C and no extended-temp Q-grade variant. | Select when superior initial accuracy and lower drift are prioritized over cost and availability of D-grade variants. |
Compared with TL431ACDBZR and MAX6003EUR+T, the LM4040D30IDBZTG4 offers optimal balance of cost, micropower operation (45μA IZ,min), and industrial temperature support - ideal for cost-sensitive, battery-aware industrial sensing where ±1.0% tolerance is acceptable.
Availability
LM4040D30IDBZTG4 is available at Aetrix Electronics and suitable for industrial analog input modules, energy infrastructure sensor nodes, and portable field transmitters requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040D30IDBZTG4 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.
The LM4040 series belongs to TI's precision voltage reference product line, engineered for high-accuracy, low-drift, and micropower operation in industrial, automotive, and portable instrumentation applications.
FAQ
What is the output voltage tolerance of the LM4040D30IDBZTG4 at 25°C?
The LM4040D30IDBZTG4 has a ±1.0% initial output voltage tolerance at 25°C, corresponding to ±30mV around the nominal 3.0V output. This D-grade specification is confirmed in Section 6.12 of the TI datasheet SLOS456Q, with ΔVZ = ±30mV at IZ = 100μA and TA = 25°C.
Does the LM4040D30IDBZTG4 require an external output capacitor?
No, the LM4040D30IDBZTG4 is stable with all capacitive loads and does not require an external output capacitor. This is explicitly stated in the Features section and validated across all operating conditions - simplifying layout and reducing BOM count in space-constrained designs.
What is the minimum cathode current needed for regulation in the LM4040D30IDBZTG4?
The LM4040D30IDBZTG4 requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation, rising to 82μA across the full –40°C to +85°C range. This value is specified in Table 6.12 under IZ,min for the LM4040D30I variant.
Can the LM4040D30IDBZTG4 be used in automotive applications?
The LM4040D30IDBZTG4 is qualified for industrial temperature range (–40°C to +85°C), making it suitable for under-dash or cabin-mounted automotive electronics. For under-hood applications requiring 125°C operation, the LM4040D30IDBZTQ variant (Q-grade) is specified - not the IDBZTG4 suffix part.
What is the wideband noise performance of the LM4040D30IDBZTG4?
The LM4040D30IDBZTG4 delivers 35μVRMS wideband noise over 10Hz–10kHz at IZ = 100μA and 25°C, as specified in Tables 6.12 and 6.13. This low-noise characteristic supports high-resolution data acquisition systems where reference noise directly impacts effective number of bits (ENOB).
LM4040D30IDBZTG4 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):
- 3V
- 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:
- 82 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D30IDBZTG4 FAQ
1.How can I place an order for LM4040D30IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D30IDBZTG4 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 LM4040D30IDBZTG4 reliable?
The price and inventory of LM4040D30IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D30IDBZTG4 is usually 5 days.
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LM4040D30IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D30IDBZTG4 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 LM4040D30IDBZTG4?
For technical support, including LM4040D30IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D30IDBZTG4 requirements.
6.How does Aetrix verify that LM4040D30IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040D30IDBZTG4 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 LM4040D30IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040D30IDBZTG4?
All LM4040D30IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D30IDBZTG4, 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 LM4040D30IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040D30IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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