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Texas Instruments LM385BLPE3-1-2
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- Part No.:
- LM385BLPE3-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BLPE3-1-2.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
LM385BLPE3-1-2 from Texas Instruments is a micropower, two-terminal, band-gap voltage reference IC operating over 15 μA to 20 mA cathode current, delivering 1.235 V nominal output with ±20 ppm/°C temperature coefficient and 1.5 Ω max reference impedance across 0°C to 70°C. It serves as a precision shunt reference in portable test instruments and battery-operated analog signal chains.
For engineers reviewing the LM385BLPE3-1-2 datasheet, LM385BLPE3-1-2 pinout, LM385BLPE3-1-2 application, or LM385BLPE3-1-2 equivalent, key selection criteria include initial voltage tolerance (±1%), long-term stability (±20 ppm/khr), low-noise operation (60 µV broadband), capacitive load tolerance, and TO-92 package compatibility with legacy meter designs.
Technical Context
This device functions as a floating shunt voltage reference, using an internal band-gap core with on-chip trimming for tight initial accuracy. Regulation requires minimum cathode current (15 μA) to power the high-gain amplifier and shunt pass element; no external biasing is needed.
Its design features internal frequency compensation enabling stable operation with arbitrary capacitive loads, and exhibits low dynamic impedance (≤1.5 Ω) across full temperature range. The TO-92 package supports through-hole mounting in space-constrained portable instrumentation where thermal dissipation ≤140 °C/W (RθJA) is acceptable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Reference Voltage | 1.235 V at 25°C - stable setpoint for ADC references and precision comparators |
| Initial Voltage Tolerance | ±1% - enables single-point calibration in portable meters without trim potentiometers |
| Temperature Coefficient | ±20 ppm/°C - ensures ≤0.15 mV drift over 0°C to 70°C operating range |
| Reference Impedance | 1.5 Ω max over full temperature range - maintains regulation under varying load currents |
| Broadband Noise | 60 µV RMS (10 Hz–10 kHz) - suitable for low-noise sensor front-ends and 12-bit+ data acquisition |
| Minimum Cathode Current | 15 µA - allows ultra-low-power operation in coin-cell-powered devices |
| Long-Term Stability | ±20 ppm/khr - supports >10-year calibration intervals in panel meters |
Pinout & Package
LM385BLPE3-1-2 uses the TO-92 (LP) package: 3-pin, straight-lead, plastic case measuring 4.30 mm × 4.30 mm × 5.34 mm max height, RoHS-compliant with Sn (matte tin) lead finish and no MSL rating (non-moisture-sensitive).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage reference node | Current must be sourced into this pin to establish regulated 1.235 V between cathode and anode; connects to system ground or negative rail in floating configurations |
| Anode (Pin 2) | Common return / reference ground | Typically tied to system ground; forms the reference potential against which cathode voltage is defined |
| NC (Pin 3) | No internal connection | Unused terminal; electrically isolated - may be left unconnected or grounded for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal shunt topology | Eliminates need for external bias resistors or supply rails - simplifies PCB layout in single-supply systems |
| Capacitive load immunity | Stable with unlimited output capacitance due to internal frequency compensation - avoids oscillation in noisy environments |
| Micropower operation | 15 μA minimum cathode current enables >10-year battery life in portable meters using CR2032 cells |
| Low-output impedance | 1.5 Ω max ensures <1 mV error under 1 mA load variation - critical for driving ADC reference inputs |
| Band-gap core with on-chip trim | Delivers ±1% initial accuracy without external calibration - reduces manufacturing test time and cost |
Applications
| Portable Test Instruments | Battery-Operated Systems |
|---|---|
|
Use Scenario: Handheld multimeters requiring stable 1.2 V reference for autoranging ADCs and LCD bias generation. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise, low-drift setpoint for analog-to-digital conversion and display driver circuits. Use Value: Enables ±0.1% measurement accuracy over 0°C–50°C ambient with no recalibration, extending field service intervals. |
Use Scenario: Wireless sensor nodes powered by lithium-thionyl chloride batteries with 15-year shelf life. IC Role / Device Role / Timing Role: Micropower reference for ultra-low-quiescent LDO feedback and sensor excitation circuitry. Use Value: Draws only 15 μA minimum current, preserving battery capacity while maintaining 1.235 V accuracy across temperature. |
| Current-Loop Instrumentation | Panel Meters |
|
Use Scenario: 4–20 mA transmitter modules converting RTD or thermocouple signals in industrial process control. IC Role / Device Role / Timing Role: Precision reference for current-sense amplifier gain setting and DAC output scaling. Use Value: ±20 ppm/°C TC and ±20 ppm/khr stability ensure loop accuracy remains within 0.05% over 5 years of continuous operation. |
Use Scenario: DIN-rail mounted digital panel meters displaying voltage, current, or temperature in factory automation panels. IC Role / Device Role / Timing Role: Primary reference for 16-bit sigma-delta ADC and LED/LCD segment drivers. Use Value: TO-92 package allows direct replacement of legacy LM385-1.2 parts without PCB redesign; 1.5 Ω impedance prevents reading errors during rapid display updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BDR-1-2 | SOIC-8 package; RθJA = 95°C/W; same electrical specs but surface-mount only | Requires reflow assembly and PCB redesign; unsuitable for through-hole meter retrofits | Select when board space is constrained and automated assembly is used |
| TLVH431ACDBVR | Adjustable 1.24 V reference; 80 µA typical IREF; higher noise (120 µV); SOT-23-5 | Needs external resistor divider for 1.235 V; less stable over temperature (±50 ppm/°C) | Choose only if programmability or smaller footprint outweighs accuracy and noise penalties |
Compared with LM385BDR-1-2 and TLVH431ACDBVR, LM385BLPE3-1-2 provides superior long-term stability and lower noise in a drop-in through-hole package, making it optimal for field-serviceable portable instrumentation where calibration integrity and mechanical robustness are prioritized over miniaturization.
Availability
LM385BLPE3-1-2 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated systems, and current-loop transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM385BLPE3-1-2 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 founded in 1930, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.
LM385BLPE3-1-2 belongs to TI's precision voltage reference product line, engineered specifically for micropower, low-drift applications in portable and battery-critical instrumentation where size, stability, and ease of use are essential.
FAQ
What is the operating temperature range for LM385BLPE3-1-2?
The LM385BLPE3-1-2 is specified for operation from 0°C to 70°C ambient temperature. This range is narrower than the LM285-1.2 (−40°C to 85°C) but sufficient for indoor portable instruments and industrial panel meters where environmental extremes are controlled. Electrical characteristics including voltage tolerance and temperature coefficient are guaranteed only within this range.
Does LM385BLPE3-1-2 require an external capacitor for stability?
No, LM385BLPE3-1-2 does not require an external capacitor for stability. Its internal frequency compensation ensures unconditional stability with any capacitive load, including large bypass capacitors (e.g., 10 µF ceramic) on the cathode node. This eliminates risk of oscillation in noisy battery-powered systems and simplifies layout in compact handheld devices.
Can LM385BLPE3-1-2 replace LM385-1.2 in existing designs?
Yes, LM385BLPE3-1-2 is a direct functional and pin-compatible replacement for LM385-1.2 in TO-92 packages, offering tighter initial tolerance (±1% vs ±2%) and identical electrical behavior. No PCB or schematic changes are required - only verify that the operating temperature stays within 0°C–70°C, as LM385BLPE3-1-2 is not rated for −40°C operation.
What is the maximum cathode current rating for LM385BLPE3-1-2?
The absolute maximum cathode current for LM385BLPE3-1-2 is 30 mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 15 μA to 20 mA. Exceeding 20 mA risks exceeding the device's power dissipation limit in TO-92 packaging, especially above 50°C ambient, potentially degrading long-term stability or causing thermal shutdown in poorly ventilated enclosures.
How does the LM385BLPE3-1-2 achieve its low temperature coefficient?
LM385BLPE3-1-2 achieves ±20 ppm/°C average temperature coefficient through a trimmed band-gap core architecture that cancels first-order thermal effects. On-chip laser trimming adjusts the curvature-compensation network during final test, ensuring minimal net drift across 0°C to 70°C. This is verified per device in production test, not inferred from family-level data.
LM385BLPE3-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 15 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM385BLPE3-1-2 FAQ
1.How can I place an order for LM385BLPE3-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BLPE3-1-2 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 LM385BLPE3-1-2 reliable?
The price and inventory of LM385BLPE3-1-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385BLPE3-1-2 is usually 5 days.
3.What payment methods are accepted for LM385BLPE3-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BLPE3-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BLPE3-1-2?
LM385BLPE3-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BLPE3-1-2 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 LM385BLPE3-1-2?
For technical support, including LM385BLPE3-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BLPE3-1-2 requirements.
6.How does Aetrix verify that LM385BLPE3-1-2 is sourced from the original manufacturer or authorized distributors?
All LM385BLPE3-1-2 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 LM385BLPE3-1-2 meets industry standards.
7.What is the process for return or replacement of LM385BLPE3-1-2?
All LM385BLPE3-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LM385BLPE3-1-2, 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 LM385BLPE3-1-2 part is unused and in its original packaging.
Return procedure for LM385BLPE3-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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