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Texas Instruments LM4041CQDBZT
- Part No.:
- LM4041CQDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041CQDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,643
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Product details
Overview
LM4041CQDBZT from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225 V output, ±0.5% initial tolerance (C grade), 100 ppm/°C max temperature coefficient, 20 μVRMS wideband noise, and stable operation from 45 μA to 12 mA cathode current. It operates across –40°C to +125°C and is used in high-accuracy analog signal chains of battery-powered instrumentation and automotive power-supply monitors.
For engineers reviewing the LM4041CQDBZT datasheet, LM4041CQDBZT pinout, LM4041CQDBZT application, or LM4041CQDBZT equivalent, key selection criteria include its extended-temperature qualification (–40°C to 125°C), SOT-23-3 package compatibility, low-noise performance under light-load conditions, and absence of required output capacitance for stability.
Technical Context
The LM4041CQDBZT implements a trimmed Zener-based shunt reference architecture with fuse and Zener-zap wafer-level trimming to achieve ±0.5% output tolerance. Its internal bandgap-derived reference core delivers stable 1.225 V output independent of cathode current between 45 μA and 12 mA.
It features ultra-low dynamic impedance (≤1.5 Ω at 1 mA), negligible load regulation error (≤2 mV over 1 mA to 12 mA), and inherent stability with all capacitive loads - eliminating need for external bypass capacitors while maintaining <100 ppm/°C drift across the full industrial+ temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V nominal; enables direct replacement of legacy 1.2 V references without resistor network redesign. |
| Initial Tolerance | ±0.5% max at 25°C (C grade); ensures system-level accuracy without post-assembly calibration in metering and sensor front-ends. |
| Temp Coefficient | ≤100 ppm/°C max over –40°C to +125°C; maintains ≤0.75% total drift across full operating range for automotive under-hood use. |
| Output Noise | 20 μVRMS (10 Hz–10 kHz); supports high-resolution ADCs (≥16-bit) without added filtering in data-acquisition systems. |
| Cathode Current Range | 45 μA (typ) to 12 mA; allows operation from ultra-low-power sleep modes up to active sensing or communication bursts. |
| Dynamic Impedance | ≤1.5 Ω at 1 mA; minimizes output voltage perturbation during transient load steps in precision power-monitor circuits. |
| ESD Rating | ±2000 V HBM; meets IEC 61000-4-2 Level 2 requirements for robustness in industrial assembly and field deployment. |
Pinout & Package
SOT-23-3 (DBZ) package: compact 2.92 mm × 1.3 mm surface-mount outline with gull-wing leads, JEDEC MO-178 compliant, suitable for automated placement and reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink and output node | Connects to regulated output rail; carries total current (load + reference bias); must be decoupled per layout best practices. |
| Anode (Pin 2) | Reference ground reference | Typically tied to system ground; forms return path for cathode current; floating anode invalidates regulation. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or tied to Anode (Pin 2); not internally bonded in DBZ package - avoids parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Guaranteed stable with any capacitive load (0–∞), removing BOM cost and PCB area for output bypass caps in space-constrained designs. |
| Extended temperature rating | Qualified from –40°C to +125°C (Q-grade), enabling use in automotive engine control units and industrial motor drives without derating. |
| Micropower startup | Operates down to 45 μA typical cathode current, supporting always-on monitoring in energy-harvesting and battery-backed systems. |
| Low thermal hysteresis | 120 ppm long-term stability after 1000 h burn-in, ensuring consistent reference accuracy across thermal cycling in field-deployed equipment. |
| High ESD immunity | ±2000 V HBM rating on all pins except FB (not present in fixed version), reducing risk of handling damage during manufacturing. |
Applications
| Automotive Power-Supply Monitor | Portable Instrumentation Front-End |
|---|---|
Use Scenario: Monitoring 12 V battery rail in ADAS camera modules during cold cranking (6 V–16 V transients). IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V for ADC reference and comparator threshold generation. Use Value: Maintains ±0.5% accuracy across –40°C to 125°C and 45 μA–12 mA load range, enabling reliable undervoltage detection without recalibration. | Use Scenario: Precision analog front-end in handheld multimeter measuring DC voltage with 0.1% full-scale accuracy. IC Role / Device Role / Timing Role: Fixed-voltage reference for 24-bit sigma-delta ADC reference input and auto-zero amplifier bias. Use Value: 20 μVRMS noise and <100 ppm/°C drift ensure measurement repeatability across ambient temperature shifts and battery discharge cycles. |
| Energy Metering Reference | Industrial Process Controller Sensor Bias |
Use Scenario: Providing reference for metrology-grade current/voltage sensing in Class 0.2 smart electricity meters. IC Role / Device Role / Timing Role: Primary shunt reference for isolated ADCs measuring grid-phase voltages and currents. Use Value: ±0.5% initial tolerance and 120 ppm long-term stability meet IEC 62053-21 accuracy requirements over 15-year product lifetime. | Use Scenario: Biasing RTD and thermocouple signal-conditioning circuitry in PLC analog input modules. IC Role / Device Role / Timing Role: Stable excitation reference for precision current sources driving 4-wire RTDs. Use Value: Low dynamic impedance (≤1.5 Ω) prevents gain error drift when sourcing 1 mA–2 mA into varying sensor impedances across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4041CQDCKR | Same electrical specs but in 5-pin SC-70 package; includes NC pins (4,5) and FB pin (5) - unused in fixed version. | Requires different footprint and stencil; no functional advantage for fixed 1.225 V use; larger board area than DBZ. | Select only if SC-70 is mandated by existing layout or mixed-variant production. |
| MAX6008CASA+ | 1.225 V fixed output, ±0.5% tolerance, but rated only to +85°C (not +125°C); higher 35 μVRMS noise. | Not qualified for under-hood automotive or high-temp industrial environments; requires additional noise filtering for 16-bit+ ADCs. | Consider only for cost-sensitive commercial-grade applications where extended temperature is unnecessary. |
Compared with LM4041CQDBZT, LM4041CQDCKR offers identical performance in a larger package with unused pins, while MAX6008CASA+ trades temperature range and noise performance for lower unit cost in non-automotive settings.
Availability
LM4041CQDBZT is available at Aetrix Electronics and suitable for automotive power-supply monitors, portable instrumentation front-ends, and energy metering reference designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4041CQDBZT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM4041 product line delivers precision shunt references optimized for micropower, low-noise, and extended-temperature operation in safety-critical analog signal conditioning and metrology applications.
FAQ
What is the operating temperature range for LM4041CQDBZT?
The LM4041CQDBZT is qualified for operation from –40°C to +125°C, meeting the extended temperature requirements for automotive under-hood and industrial control applications. This Q-grade rating is confirmed in Section 5.6 of the TI datasheet (SLCS146H), which specifies electrical characteristics across the full –40°C to +125°C ambient range. The "Q" suffix explicitly denotes this extended temperature capability.
Does LM4041CQDBZT require an output capacitor for stability?
No, LM4041CQDBZT does not require an output capacitor for stability. As stated in Section 7.1 and Feature list, it is designed to remain stable with all capacitive loads - including zero capacitance. This eliminates BOM cost and PCB area for bypass capacitors, simplifying design in space-constrained applications like portable instrumentation and automotive sensors.
What is the minimum cathode current needed for LM4041CQDBZT to regulate properly?
The LM4041CQDBZT requires a minimum cathode current of 45 μA (typical) and 80 μA (max over temperature) to maintain regulation within specifications. This value is specified in Tables 5.4–5.6 of the datasheet under "IZ,min". Operating below this threshold may cause output voltage deviation exceeding ±0.5% tolerance, especially at temperature extremes.
How does the LM4041CQDBZT differ from the LM4041BQDBZT?
The LM4041CQDBZT has ±0.5% initial output tolerance and 100 ppm/°C max temperature coefficient, while the LM4041BQDBZT offers tighter ±0.2% tolerance and same 100 ppm/°C drift. Both share identical package (SOT-23-3), temperature range (–40°C to +125°C), noise (20 μVRMS), and current range (45 μA–12 mA). The "C" grade provides optimal cost-performance balance for applications where ±0.5% accuracy suffices.
Is LM4041CQDBZT pin-compatible with other LM4041 variants in SOT-23-3?
Yes, all LM4041 variants in the DBZ (SOT-23-3) package - including LM4041A/B/C/D x12Q/I and fixed/adjustable versions - share identical pinout: Cathode (Pin 1), Anode (Pin 2), and NC (Pin 3). Pin compatibility is confirmed in Figures 4-1 and 4-4 of the datasheet. However, fixed and adjustable versions differ electrically: LM4041CQDBZT has no functional FB pin, whereas adjustable variants route FB to Pin 1.
LM4041CQDBZT 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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.233V
- Voltage - Output (Max):
- 10 V
- Current - Output:
- 12 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4041CQDBZT FAQ
1.How can I place an order for LM4041CQDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041CQDBZT 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 LM4041CQDBZT reliable?
The price and inventory of LM4041CQDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041CQDBZT is usually 5 days.
3.What payment methods are accepted for LM4041CQDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041CQDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041CQDBZT?
LM4041CQDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041CQDBZT 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 LM4041CQDBZT?
For technical support, including LM4041CQDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041CQDBZT requirements.
6.How does Aetrix verify that LM4041CQDBZT is sourced from the original manufacturer or authorized distributors?
All LM4041CQDBZT 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 LM4041CQDBZT meets industry standards.
7.What is the process for return or replacement of LM4041CQDBZT?
All LM4041CQDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4041CQDBZT, 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 LM4041CQDBZT part is unused and in its original packaging.
Return procedure for LM4041CQDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4041CQDBZT Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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