Specifications
| Type | Description |
|---|---|
| Part Number | LM4040 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | SOT-23 (3) 2.92mm x 1.30mm; SC70 (5) 2.00mm x 1.25mm; TO-92 (3) 4.83mm x 3.68mm |
| Component Type | Power_IC |
| Fixed Output Voltages | 2.048 V, 2.5 V, 3 V, 4.096 V, 5 V, 8.192 V, 10 V |
| Initial Accuracy Grade A | 0.1% max |
| Initial Accuracy Grade B | 0.2% max |
| Initial Accuracy Grade C | 0.5% max |
| Initial Accuracy Grade D | 1.0% max |
| Temperature Coefficient Grade A | 100 ppm/degC max |
| Temperature Coefficient Grade B | 100 ppm/degC max |
| Temperature Coefficient Grade C | 100 ppm/degC max |
| Temperature Coefficient Grade D | 150 ppm/degC max |
| Output Noise | 35 uV RMS typ; wideband noise, IZ=100 uA, 10 Hz <= f <= 10 kHz, TA=25 degC |
| Operating Current Range | 45 uA typ to 15 mA; cathode current operating range |
| Continuous Cathode Current | -10 mA min, 25 mA max; absolute maximum ratings over free-air temperature range |
| Operating Virtual Junction Temperature | 150 degC max; absolute maximum ratings |
| Storage Temperature Range | -65 degC to 150 degC; absolute maximum ratings |
| ESD Rating HBM | +/-2000 V; human body model per ANSI/ESDA/JEDEC JS-001, all pins |
| ESD Rating CDM | +/-500 V; charged device model per JEDEC JESD22-C101, all pins |
| Recommended Cathode Current | 15 mA max; recommended operating conditions, minimum from parametric tables |
| Free-Air Temperature Range I Version | -40 degC to 85 degC; LM4040xxxI recommended operating condition |
| Free-Air Temperature Range Q Version | -40 degC to 125 degC; LM4040xxxQ recommended operating condition |
| Junction-to-Ambient Thermal Resistance DBZ | 206 degC/W; SOT-23 DBZ, 3 pins |
| Junction-to-Ambient Thermal Resistance DCK | 252 degC/W; SC70 DCK, 5 pins |
| Reverse Breakdown Voltage LM4040A20I | 2.048 V typ; IZ=100 uA, TA=25 degC |
| Reverse Breakdown Voltage Tolerance LM4040A20I | -2 mV min, +2 mV max at 25 degC; -15 mV min, +15 mV max full range |
| Reverse Breakdown Voltage Tolerance LM4040B20I | -4.1 mV min, +4.1 mV max at 25 degC; -17 mV min, +17 mV max full range |
| Minimum Cathode Current LM4040A20I/LM4040B20I | 45 uA typ, 75 uA max at 25 degC; 80 uA max full range |
| Reverse Breakdown Voltage Change with Cathode Current LM4040A20I/LM4040B20I, Low Current | 0.3 mV typ, 0.8 mV max at 25 degC; 1 mV max full range; IZ,min < IZ < 1 mA |
| Reverse Breakdown Voltage Change with Cathode Current LM4040A20I/LM4040B20I, High Current | 2.5 mV typ, 6 mV max at 25 degC; 8 mV max full range; 1 mA < IZ < 15 mA |
| Reverse Dynamic Impedance LM4040A20I/LM4040B20I | 0.3 ohm typ, 0.8 ohm max; IZ=1 mA, f=120 Hz, IAC=0.1 IZ, TA=25 degC |
| Long-Term Stability LM4040A20I/LM4040B20I | 120 ppm; t=1000 h, TA=25 degC +/-0.1 degC, IZ=100 uA |
| Thermal Hysteresis LM4040A20I/LM4040B20I | 0.08%; Delta TA=-40 degC to 125 degC |
| Datasheet Status | request_only |
Product Overview
The LM4040 is a Texas Instruments precision micropower shunt voltage reference in the Power_Management category. It is available with fixed output voltages of 2.048 V, 2.5 V, 3 V, 4.096 V, 5 V, 8.192 V, and 10 V, allowing selection by required reference level.
Accuracy options are organized by grade: A grade is specified at 0.1% max initial accuracy, B at 0.2% max, C at 0.5% max, and D at 1.0% max. Temperature coefficient limits are 100 ppm/degC max for A, B, and C grades, and 150 ppm/degC max for D grade.
Package options include SOT-23 (3) 2.92mm x 1.30mm, SC70 (5) 2.00mm x 1.25mm, and TO-92 (3) 4.83mm x 3.68mm. The recommended cathode current maximum is 15 mA, with a cathode current operating range stated as 45 uA typ to 15 mA. I-version operation covers -40 degC to 85 degC, while Q-version operation covers -40 degC to 125 degC.
Key Features
- Fixed outputs from 2.048 V through 10 V
- A grade initial accuracy is 0.1% max
- B grade initial accuracy is 0.2% max
- C grade initial accuracy is 0.5% max
- D grade initial accuracy is 1.0% max
- A, B, and C grades specify 100 ppm/degC max
- D grade specifies 150 ppm/degC max temperature coefficient
- 35 uV RMS typical wideband output noise
- Cathode current operating range reaches 15 mA
- I version operates from -40 degC to 85 degC
- Q version operates from -40 degC to 125 degC
- SOT-23, SC70, and TO-92 package options
Typical Applications
- Shunt voltage reference circuits
- Micropower reference rails
- Fixed 2.048 V reference nodes
- Fixed 4.096 V reference nodes
- Fixed 5 V reference nodes
- Circuits needing graded initial accuracy
- Circuits requiring specified cathode current operation
Procurement Notes
When requesting a quote for LM4040, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What output voltage options are available for the LM4040?
The LM4040 voltage options listed in the extracted datasheet facts are 2.048 V, 2.5 V, 3 V, 4.096 V, 5 V, 8.192 V, and 10 V.
What initial accuracy grades does the LM4040 support?
The LM4040 has four listed initial accuracy grades: A grade at 0.1% max, B grade at 0.2% max, C grade at 0.5% max, and D grade at 1.0% max.
What current range is specified for LM4040 cathode operation?
The extracted facts list a cathode current operating range of 45 uA typ to 15 mA. The recommended cathode current maximum is also listed as 15 mA.
Which package options are listed for the LM4040?
The listed package options are SOT-23 (3) measuring 2.92mm x 1.30mm, SC70 (5) measuring 2.00mm x 1.25mm, and TO-92 (3) measuring 4.83mm x 3.68mm.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 25, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.