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Texas Instruments LM4040C41IDBZR
- Part No.:
- LM4040C41IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C41IDBZR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,124
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Product details
Overview
LM4040C41IDBZR from Texas Instruments is a precision micropower shunt voltage reference with 4.096V nominal output, ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift reference in analog-to-digital converter biasing and sensor signal conditioning circuits.
For engineers reviewing the LM4040C41IDBZR datasheet, LM4040C41IDBZR pinout, LM4040C41IDBZR application, or LM4040C41IDBZR equivalent, key selection criteria include guaranteed 4.096V output tolerance over –40°C to 85°C, no-output-capacitor-required stability, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4040C41IDBZR operates as a two-terminal shunt reference, sinking cathode current to maintain a precise reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components, and its low dynamic impedance (≤0.9Ω at 1mA) ensures minimal output variation under load transients.
It functions within a fixed industrial temperature range (–40°C to 85°C), supports all capacitive loads without oscillation, and delivers long-term stability of 120ppm after 1000 hours. The device requires no startup time and exhibits thermal hysteresis of only 0.08% over full temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; enables exact 12-bit full-scale ADC reference when paired with 4.096V-compatible converters. |
| Initial Accuracy | ±0.5% at 25°C; guarantees output stays within ±20.5mV of 4.096V before temperature or aging effects. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to 85°C ambient range. |
| Operating Current | 45μA to 15mA cathode range; supports ultra-low-power sensor nodes and high-current precision DACs. |
| Output Noise | 35μVRMS (10Hz–10kHz); avoids quantization uncertainty in 16-bit+ data acquisition systems. |
| Dynamic Impedance | 0.9Ω max at 1mA; limits output voltage shift to <0.9mV per 1mA load change. |
Pinout & Package
LM4040C41IDBZR uses the SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, 3-pin surface-mount outline with gull-wing leads.
| 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 return | Provides stable 4.096V relative to system ground; must be tied to GND or low-impedance return path. |
| NC (Pin 3) | No internal connection | Not bonded; electrically isolated-must remain unconnected or floating per TI specification. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 100nF; eliminates BOM cost and layout area for external stabilization caps. |
| Micropower start-up | 45μA minimum cathode current enables use in battery-powered field transmitters with multi-year runtime. |
| Low thermal hysteresis | 0.08% voltage shift after –40°C ↔ 125°C cycling ensures repeatable calibration in cyclic thermal environments. |
| Extended temp grade | Specified for –40°C to 85°C operation; validated for industrial control and energy infrastructure deployments. |
| Zener-zap trimming | Fuse-based wafer-level calibration achieves ±0.5% tolerance without post-package adjustment or laser trimming. |
Applications
| Data-Acquisition Systems | Analog Input Module |
|---|---|
Use Scenario: High-resolution ADC front-end in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for 16-bit SAR ADCs, directly setting full-scale input range. Use Value: Enables ±0.5 LSB integral nonlinearity performance by limiting reference-induced error to <2mV over temperature. | Use Scenario: Multi-channel voltage/current measurement in industrial process monitoring systems. IC Role / Device Role / Timing Role: Supplies common reference to multiple instrumentation amplifiers and multiplexed ADC channels. Use Value: Eliminates channel-to-channel gain mismatch caused by independent reference drift, improving system-level accuracy. |
| Field Transmitters | Energy Infrastructure |
Use Scenario: 4–20mA loop-powered temperature/pressure transmitter with onboard signal conditioning. IC Role / Device Role / Timing Role: References the DAC that sets loop current; also biases sensor bridge and op-amps. Use Value: Maintains 0.1% loop accuracy over –40°C to 70°C ambient due to low tempco and micropower stability. | Use Scenario: Voltage monitoring in solar inverter DC-link and battery management systems. IC Role / Device Role / Timing Role: Feeds precision comparator thresholds and ADC inputs for overvoltage/undervoltage detection. Use Value: Guarantees trip-point repeatability within ±20mV across 10-year field life, supporting IEC 62109 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | Same 4.096V output, ±0.5% tolerance, but higher 50ppm/°C typical tempco (vs. 100ppm/°C max for LM4040C41IDBZR); 40μA min cathode current. | Lower noise (20μVRMS) and tighter tempco support higher-precision metrology; not qualified for extended temp range. | Select TL4050C41IDBZR when noise-limited 18-bit systems demand sub-25μVRMS; retain LM4040C41IDBZR for cost-sensitive industrial designs requiring proven 85°C operation. |
| REF3040AIDBZR | 4.096V output, ±0.2% initial accuracy (A grade), 50ppm/°C max tempco, but series topology requiring 2.2V headroom and 50μA quiescent current. | Requires higher supply voltage and cannot sink current; unsuitable for shunt-configured legacy circuits. | Choose REF3040AIDBZR only in new designs where series topology simplifies biasing and tighter accuracy justifies added headroom overhead. |
Compared with TL4050C41IDBZR and REF3040AIDBZR, LM4040C41IDBZR offers the lowest system-level integration effort in shunt topologies, widest operating current range, and direct drop-in replacement capability for legacy LM4040-based designs-without requiring PCB layout changes or supply rail adjustments.
Availability
LM4040C41IDBZR is available at Aetrix Electronics and suitable for data-acquisition systems, analog input modules, and field transmitters requiring stable component supply with consistent parametric performance across production batches.
Supply support for LM4040C41IDBZR 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 family is designed for cost-effective, high-stability voltage referencing in space-constrained industrial and instrumentation applications-emphasizing micropower operation, no-capacitor stability, and robust temperature performance.
FAQ
What is the maximum operating temperature range for LM4040C41IDBZR?
The LM4040C41IDBZR is characterized for operation from –40°C to +85°C ambient temperature. This industrial temperature range is verified per TI's LM4040C41I specifications and applies to all electrical parameters in the official datasheet. It is not rated for the extended –40°C to +125°C range used by Q-grade variants like LM4040C41Q.
Does LM4040C41IDBZR require an external output capacitor?
No, LM4040C41IDBZR does not require an external output capacitor. Its internal design ensures stability with all capacitive loads-including 0pF-making it suitable for direct connection to ADC reference inputs or op-amp feedback networks without added components. This is explicitly confirmed in the TI datasheet Section 3 and Section 8.2.
What is the minimum cathode current needed for LM4040C41IDBZR to regulate properly?
The LM4040C41IDBZR requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation within specification. At full temperature range (–40°C to 85°C), the guaranteed minimum is 80μA. Below this, output voltage may deviate beyond the ±0.5% initial accuracy band.
How does the pin configuration of LM4040C41IDBZR differ from TO-92 packaged variants?
LM4040C41IDBZR uses the SOT-23-3 (DBZ) package with Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC. In contrast, TO-92 variants assign Cathode to Pin 2 and Anode to Pin 3. This pinout difference means direct PCB replacement is not possible without layout revision-LM4040C41IDBZR is not pin-compatible with through-hole LM4040C41ILP.
Can LM4040C41IDBZR be used in place of LM4040B41IDBZR?
Yes, LM4040C41IDBZR can replace LM4040B41IDBZR in most applications, but with trade-offs: C grade offers ±0.5% initial accuracy versus B grade's ±0.2%, while sharing identical 100ppm/°C tempco, noise, and package. Use LM4040C41IDBZR where cost sensitivity outweighs the need for tighter initial tolerance.
LM4040C41IDBZR 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 88 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C41IDBZR FAQ
1.How can I place an order for LM4040C41IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C41IDBZR 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 LM4040C41IDBZR reliable?
The price and inventory of LM4040C41IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C41IDBZR is usually 5 days.
3.What payment methods are accepted for LM4040C41IDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C41IDBZR transactions.
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4.How is shipping managed for LM4040C41IDBZR?
LM4040C41IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C41IDBZR 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 LM4040C41IDBZR?
For technical support, including LM4040C41IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C41IDBZR requirements.
6.How does Aetrix verify that LM4040C41IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040C41IDBZR 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 LM4040C41IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040C41IDBZR?
All LM4040C41IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C41IDBZR, 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 LM4040C41IDBZR part is unused and in its original packaging.
Return procedure for LM4040C41IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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