My Inquiry
My Account
Texas Instruments LM385LPE3-2-5
,TO-226_straightlead.jpg)
- Part No.:
- LM385LPE3-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385LPE3-2-5.pdf
- Description:
- IC VREF SHUNT 3% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:778
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM385LPE3-2-5 from Texas Instruments is a micropower, two-terminal, band-gap shunt voltage reference delivering a precise 2.5 V output with ±1.5% initial tolerance (2.425 V to 2.575 V), 1.5 Ω max reference impedance over full temperature range, and operation from 20 μA to 20 mA cathode current. It serves as a stable reference in portable test instruments, battery-operated systems, and current-loop instrumentation where low power and high stability are critical.
For engineers reviewing the LM385LPE3-2-5 datasheet, LM385LPE3-2-5 pinout, LM385LPE3-2-5 application, or LM385LPE3-2-5 equivalent, this page provides verified technical context, real-world design meaning of key specs, TO-92 package details, application-specific implementation guidance, and validated alternative options for precision analog reference design.
Technical Context
The LM385LPE3-2-5 implements a floating shunt topology using an internal band-gap reference core and high-gain amplifier to regulate voltage between cathode and anode. Its design enables stable operation with capacitive loads up to 10 nF without external compensation.
It operates exclusively in shunt mode: regulation requires sourcing current into the cathode while the anode connects to ground or a lower potential. Minimum cathode current is 8 μA at full temperature range (0°C to 70°C), and dynamic impedance remains ≤1.5 Ω across that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal, 2.425–2.575 V (±1.5% initial tolerance) - sets absolute accuracy baseline for ADC references and sensor biasing. |
| Cathode Current Range | 20 μA to 20 mA - supports ultra-low-power sleep modes and higher-drive applications without external buffering. |
| Reference Impedance | ≤1.5 Ω over 0°C to 70°C - ensures minimal output voltage shift under varying load currents in precision circuits. |
| Tempco | ±20 ppm/°C average - enables <1 mV drift over 50°C ambient range, critical for portable meter calibration. |
| Long-Term Stability | ±20 ppm/khr - guarantees <0.2% voltage drift over 10,000 hours, supporting multi-year battery-powered deployments. |
| Noise (10 Hz–10 kHz) | 120 µV broadband - low enough for 12-bit ADC reference without additional filtering in handheld instruments. |
Pinout & Package
LM385LPE3-2-5 uses the TO-92 (LP) package: 4.30 mm × 4.30 mm body, 3-pin through-hole format with standard lead spacing. Anode is pin 1, Cathode is pin 2, and pin 3 is NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Common node, typically grounded | Reference return path; must be connected to system ground or lowest potential point for proper shunt regulation. |
| Pin 2 (CATHODE) | Shunt current/voltage input | Current injection point; voltage develops across cathode-anode; determines regulation accuracy and thermal dissipation. |
| Pin 3 (NC) | No internal connection | Unused terminal; must remain unconnected-no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Band-gap reference core | Delivers intrinsic temperature stability and low long-term drift without laser trimming dependency. |
| Floating shunt architecture | Enables use in both high-side and low-side configurations-e.g., negative rail referencing or current-sense amplifier biasing. |
| Capacitive load tolerance | Stable with ≥10 nF bypass capacitance on cathode, simplifying noise reduction in compact PCB layouts. |
| Micropower operation | 20 μA minimum operating current extends battery life in portable meters beyond shelf-life limits. |
Applications
| Portable Test Instrument Reference | Battery-Operated Sensor Biasing |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 12-bit ADC scaling across 0–100°C ambient range. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute measurement baseline for analog front-end signal conditioning. Use Value: ±1.5% initial tolerance and ±20 ppm/°C tempco ensure <0.5% total error over full operating range without recalibration. |
Use Scenario: Low-power gas sensor module powered by coin cell, needing consistent bias voltage for electrochemical transducer. IC Role / Device Role / Timing Role: Precision shunt reference supplying regulated excitation voltage to sensor element. Use Value: 20 μA minimum current allows continuous operation for >5 years on CR2032, matching sensor lifetime requirements. |
| Current-Loop Transmitter Calibration | Panel Meter Voltage Scaling |
Use Scenario: 4–20 mA industrial transmitter where DAC output must be scaled using a stable reference independent of supply rail variation. IC Role / Device Role / Timing Role: Fixed 2.5 V reference for DAC full-scale setting in isolated loop-powered design. Use Value: ≤1.5 Ω dynamic impedance prevents gain error when DAC load current varies with output code. |
Use Scenario: Analog panel meter with moving-coil display driven by op-amp integrator requiring exact 2.5 V reference for 0–100% scale linearity. IC Role / Device Role / Timing Role: Primary voltage reference for analog-to-analog scaling circuitry. Use Value: 120 µV broadband noise avoids visible needle jitter during steady-state readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BLP-2-5 | Tighter ±0.5% initial tolerance (2.462–2.538 V); same TO-92 package and 0°C–70°C range. | Better suited for high-accuracy calibration equipment where initial error budget is constrained. | Select LM385BLP-2-5 when ±0.5% tolerance is required; LM385LPE3-2-5 remains optimal for cost-sensitive portable designs meeting ±1.5%. |
| TLVH431ACLP | Adjustable 1.24–18 V output via external resistors; 2% initial tolerance; SOT-23-3 package; 0°C–70°C. | Offers programmability but requires two external resistors and has higher minimum cathode current (80 μA). | Choose TLVH431ACLP only if adjustable reference voltage is needed; LM385LPE3-2-5 provides simpler, lower-power fixed 2.5 V solution. |
Compared with LM385BLP-2-5 and TLVH431ACLP, LM385LPE3-2-5 delivers the optimal balance of fixed 2.5 V accuracy, ultra-low 20 μA operating current, TO-92 compatibility, and cost efficiency for battery-constrained portable instrumentation-without requiring layout changes or external components.
Availability
LM385LPE3-2-5 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated sensor nodes, and current-loop transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM385LPE3-2-5 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.
LM385LPE3-2-5 belongs to TI's micropower shunt voltage reference product line, designed specifically for ultra-low-power, high-stability applications in portable and battery-operated instrumentation.
FAQ
What is the operating temperature range for LM385LPE3-2-5?
The LM385LPE3-2-5 is specified for operation from 0°C to 70°C. This range applies to all electrical characteristics including reference voltage tolerance, temperature coefficient, and minimum cathode current. It is not rated for extended industrial or automotive temperature ranges.
Can LM385LPE3-2-5 be used in negative-voltage reference applications?
Yes, LM385LPE3-2-5 supports floating shunt operation: its anode can be tied to a negative rail while cathode connects to a less-negative or ground-referenced node. This enables generation of stable 2.5 V above any DC potential, including negative supplies, without polarity reversal.
What is the maximum cathode current rating for LM385LPE3-2-5?
The absolute maximum cathode current for LM385LPE3-2-5 is 30 mA, per TI's Absolute Maximum Ratings. However, sustained operation above 20 mA requires thermal derating based on ambient temperature and PCB copper area, as junction temperature must remain below 150°C.
Does LM385LPE3-2-5 require an external capacitor for stability?
No, LM385LPE3-2-5 features internal frequency compensation and remains stable with capacitive loads up to 10 nF on the cathode node. A 0.1 µF ceramic bypass capacitor is optional and recommended only for high-noise environments-not required for basic regulation.
How does the reference impedance of LM385LPE3-2-5 affect accuracy in a current-sensing application?
With ≤1.5 Ω reference impedance over 0°C–70°C, LM385LPE3-2-5 introduces ≤15 mV error when cathode current varies by 10 mA-critical for maintaining gain accuracy in current-sense amplifier bias networks. This low impedance ensures predictable, load-independent reference voltage.
LM385LPE3-2-5 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±3%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM385LPE3-2-5 FAQ
1.How can I place an order for LM385LPE3-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385LPE3-2-5 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 LM385LPE3-2-5 reliable?
The price and inventory of LM385LPE3-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385LPE3-2-5 is usually 5 days.
3.What payment methods are accepted for LM385LPE3-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385LPE3-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385LPE3-2-5?
LM385LPE3-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385LPE3-2-5 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 LM385LPE3-2-5?
For technical support, including LM385LPE3-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385LPE3-2-5 requirements.
6.How does Aetrix verify that LM385LPE3-2-5 is sourced from the original manufacturer or authorized distributors?
All LM385LPE3-2-5 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 LM385LPE3-2-5 meets industry standards.
7.What is the process for return or replacement of LM385LPE3-2-5?
All LM385LPE3-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385LPE3-2-5, 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 LM385LPE3-2-5 part is unused and in its original packaging.
Return procedure for LM385LPE3-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385LPE3-2-5 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
