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Texas Instruments LM385LPRE3-1-2
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- Part No.:
- LM385LPRE3-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM385LPRE3-1-2.pdf
- Description:
- IC VREF SHUNT 2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,687
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Product details
Overview
LM385LPRE3-1-2 from Texas Instruments is a micropower, two-terminal, band-gap voltage reference in TO-92 package, delivering 1.235 V nominal output with ±20 ppm/°C temperature coefficient, 15 μA to 20 mA operating current range, and 1.5 Ω max reference impedance over full temperature range. It serves as a precision shunt reference in battery-operated portable meters and low-power analog signal conditioning circuits.
For engineers reviewing the LM385LPRE3-1-2 datasheet, LM385LPRE3-1-2 pinout, LM385LPRE3-1-2 application, or LM385LPRE3-1-2 equivalent, key selection criteria include initial voltage tolerance (2%), long-term stability (±20 ppm/khr), capacitive load tolerance, cathode current compliance, and TO-92 thermal performance at 0°C to 70°C.
Technical Context
The LM385LPRE3-1-2 operates as a floating shunt reference, regulating voltage between cathode and anode using internal band-gap core and high-gain amplifier. Its design includes on-chip trimming for tight initial tolerance and internal frequency compensation enabling stable operation with any capacitive load.
It functions exclusively in fixed-voltage reference mode with no adjustability. Regulation requires minimum cathode current of 15 μA at 25°C, and it maintains stable output across 0°C to 70°C ambient while exhibiting low broadband noise (60 µV, 10 Hz–10 kHz) and excellent long-term drift performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Reference Voltage | 1.235 V - precise band-gap output used as stable DC bias or ADC reference point |
| Initial Voltage Tolerance | ±2% - ensures system accuracy without external calibration in cost-sensitive designs |
| Temp. Coefficient (αVZ) | ±20 ppm/°C - enables stable operation across 0°C to 70°C without thermal compensation circuitry |
| Operating Current Range | 15 μA to 20 mA - supports ultra-low-power sleep modes and higher-drive analog stages |
| Reference Impedance | 1.5 Ω max over full temp - minimizes output voltage shift under dynamic load transients |
| Long-Term Drift | ±20 ppm/khr - guarantees <0.2% output change over 10 years in typical storage conditions |
| Broadband Noise | 60 µV (10 Hz–10 kHz) - suitable for 12-bit+ precision measurement front-ends |
Pinout & Package
LM385LPRE3-1-2 uses TO-92 package (LP drawing), 4.30 mm × 4.30 mm body, 5.34 mm max height, with straight or formed leads. Thermal resistance RθJA = 140 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt Current/Voltage Input | Current-sink node where regulated 1.235 V appears relative to Anode; must be biased with ≥15 μA |
| Anode (Pin 2) | Common Pin (GND Reference) | Return path for cathode current; establishes reference ground for floating or negative-regulation topologies |
| NC (Pin 3) | No Internal Connection | Unbonded lead; electrically isolated-must not be connected to any net or plane |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with unlimited capacitance - eliminates need for isolation resistors in filtering applications |
| Low Power Consumption | 15 μA min operating current - extends battery life in portable instruments beyond shelf-life limits |
| Interchangeability | Pin-and-function compatible with LM285-1.2 and LM385-1.2 - enables drop-in replacement in legacy designs |
| ESD Robustness | ±2000 V HBM - withstands standard handling without special ESD precautions beyond basic grounding |
Applications
| Portable Meter References | Portable Test Instruments |
|---|---|
Use Scenario: Handheld multimeters requiring stable 1.2 V reference for ADC scaling and auto-zero calibration. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric accuracy against battery supply variations. Use Value: Enables >4½-digit resolution with <0.02% full-scale error over 0°C–50°C operating range. | Use Scenario: Battery-powered oscilloscope probes and signal generators needing low-drift DC offset control. IC Role / Device Role / Timing Role: Precision bias generator for op-amp input stages and DAC output buffers. Use Value: Maintains <100 µV offset drift over 8-hour field use, eliminating warm-up recalibration cycles. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Wireless sensor nodes powered by coin-cell batteries with multi-year deployment requirements. IC Role / Device Role / Timing Role: Core reference for microcontroller ADC, LDO feedback, and wake-up comparator thresholds. Use Value: Draws only 15 μA quiescent current, contributing <0.3% to total system standby power budget. | Use Scenario: 4–20 mA industrial transmitters where reference stability directly impacts loop accuracy. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise current-sense voltage across sense resistor. Use Value: Delivers ±0.1% loop accuracy over -25°C to +70°C with no external trimming components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385B-1.2 (e.g., LM385BLPRE3-1-2) | 1% initial tolerance vs. 2% for LM385LPRE3-1-2; same TO-92 package and 0°C–70°C range | Higher-accuracy systems requiring tighter initial calibration, such as lab-grade instrumentation | Select when ±1% absolute reference accuracy is mandatory and cost premium is acceptable |
| TLVH431ACDBVR | Adjustable 1.24 V reference (2.5 V max), 3-pin SOT-23, 80 µA typical IREF, ±0.5% initial tolerance | Requires external resistors for 1.2 V setting; better for programmable or multi-voltage designs | Choose when board space is constrained or adjustable reference capability is needed alongside precision |
Compared with LM385LPRE3-1-2, LM385BLPRE3-1-2 offers tighter initial tolerance at identical thermal and current specs, while TLVH431ACDBVR trades simplicity and fixed output for adjustability and smaller footprint-neither is pin-compatible, but both serve overlapping low-power reference roles.
Availability
LM385LPRE3-1-2 is available at Aetrix Electronics and suitable for portable meter references, battery-operated systems, and current-loop instrumentation requiring stable component supply with RoHS-compliant, Pb-free TO-92 packaging.
Supply support for LM385LPRE3-1-2 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LMx85-1.2 series was designed specifically for micropower, two-terminal shunt voltage reference applications in portable, battery-constrained, and industrial measurement systems where long-term stability and low operating current are critical.
FAQ
What is the operating temperature range for LM385LPRE3-1-2?
The LM385LPRE3-1-2 is specified for operation from 0°C to 70°C ambient temperature. This range is confirmed in the Recommended Operating Conditions table of the SLVS075J datasheet and applies to all electrical characteristics including reference voltage, temperature coefficient, and impedance. It is not rated for the extended –40°C to 85°C range of the LM285-1.2 variant.
Does LM385LPRE3-1-2 require an external capacitor for stability?
No, LM385LPRE3-1-2 does not require an external capacitor for stability. Its internal frequency compensation ensures stable operation with any capacitive load-including large bypass or filtering capacitors-making it inherently tolerant of layout parasitics and simplifying design in portable equipment.
What is the minimum cathode current needed for regulation in LM385LPRE3-1-2?
The minimum cathode current required for proper regulation in LM385LPRE3-1-2 is 15 μA at 25°C, as specified in the Electrical Characteristics table under "Minimum reference current" for LM385-1.2 devices. Below this threshold, output voltage deviates significantly from nominal 1.235 V.
Can LM385LPRE3-1-2 be used in negative-reference configurations?
Yes, LM385LPRE3-1-2 can be used in negative-reference configurations because it is a floating shunt device. With Anode tied to a positive rail and Cathode grounded (or referenced to a higher potential), it regulates a negative voltage relative to system ground-enabling dual-supply biasing without additional components.
Is LM385LPRE3-1-2 pin-compatible with LM285-1.2 in TO-92 package?
Yes, LM385LPRE3-1-2 is pin-compatible with LM285LPRE3-1-2 and other TO-92 variants in the LMx85 family. All share identical LP package drawing, pin 1 (Cathode), pin 2 (Anode), and pin 3 (NC), enabling direct PCB substitution where temperature range and tolerance requirements align.
LM385LPRE3-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±2%
- 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
LM385LPRE3-1-2 FAQ
1.How can I place an order for LM385LPRE3-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385LPRE3-1-2 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 LM385LPRE3-1-2 reliable?
The price and inventory of LM385LPRE3-1-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385LPRE3-1-2 is usually 5 days.
3.What payment methods are accepted for LM385LPRE3-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385LPRE3-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385LPRE3-1-2?
LM385LPRE3-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385LPRE3-1-2 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 LM385LPRE3-1-2?
For technical support, including LM385LPRE3-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385LPRE3-1-2 requirements.
6.How does Aetrix verify that LM385LPRE3-1-2 is sourced from the original manufacturer or authorized distributors?
All LM385LPRE3-1-2 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 LM385LPRE3-1-2 meets industry standards.
7.What is the process for return or replacement of LM385LPRE3-1-2?
All LM385LPRE3-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LM385LPRE3-1-2, 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 LM385LPRE3-1-2 part is unused and in its original packaging.
Return procedure for LM385LPRE3-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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