My Inquiry
My Account
Texas Instruments LM385Z-2.5/NOPB
- Part No.:
- LM385Z-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385Z-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 3% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM385Z-2.5/NOPB from Texas Instruments is a 2-terminal micropower band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance (A grade), and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385Z-2.5/NOPB datasheet, LM385Z-2.5/NOPB pinout, LM385Z-2.5/NOPB application, or LM385Z-2.5/NOPB equivalent, key selection considerations include its TO-92 package, 0°C to 70°C operating temperature range, 30 ppm/°C max average temperature coefficient (X suffix), wideband noise of 120 μVrms, and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385Z-2.5/NOPB uses a band-gap core with on-chip trimming for tight voltage accuracy and achieves low dynamic impedance via optimized transistor-resistor topology. Its two-terminal configuration simplifies integration into series-shunt reference topologies without requiring external biasing components.
Designed for micropower operation, it maintains regulation across a 1000× current range (20 μA to 20 mA) and exhibits exceptional tolerance to capacitive loading-enabling direct use with bypass capacitors up to 10 μF without phase-margin degradation or oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal; ±20 mV (±0.8%) initial tolerance ensures accurate ADC/DAC reference or sensor excitation without calibration. |
| Operating Current Range | 20 μA to 20 mA; supports ultra-low-power standby (e.g., 30 μA meter applications) and higher-drive configurations like 5V/10V references. |
| Dynamic Impedance | 0.6 Ω (A grade); minimizes load-induced voltage shift in precision current sources and feedback networks. |
| Temperature Coefficient | 30 ppm/°C (X suffix); guarantees ≤0.75 mV drift over 0°C–70°C ambient, suitable for industrial-grade instrumentation. |
| Wideband Noise (10 Hz–10 kHz) | 120 μVrms; low enough for 12-bit+ data acquisition systems without additional filtering. |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C); ensures reference integrity in field-deployed equipment with multi-year service life. |
Pinout & Package
LM385Z-2.5/NOPB is housed in a 3-pin TO-92 plastic package (JEDEC TO-226AA, TI drawing LP0003A), with pins arranged linearly: Pin 1 (Anode), Pin 2 (Cathode), Pin 3 (Die Attach Pad, internally connected to Pin 2 or left floating per design).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current entry point; connects to supply rail or current source in series-reference configuration. |
| Pin 2 | Cathode | Reference output node; provides regulated 2.5 V when reverse-biased at ≥20 μA. |
| Pin 3 | Die Attach Pad (DAP) | Internally tied to die substrate; electrically connected to Pin 2 in most units-should be bonded to Pin 2 or left unconnected per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with up to 10 μF output capacitance-eliminates need for isolation resistors in battery-powered designs. |
| Micropower Operation | 20 μA minimum operating current enables >10-year shelf-life battery operation in portable meters and IoT sensors. |
| Low Dynamic Impedance | 0.6 Ω (A grade) reduces output voltage variation under dynamic load steps, critical for precision current mirrors. |
| Band-Gap Core Architecture | Transistor/resistor-only design ensures low 1/f noise and superior long-term drift vs. Zener-based references. |
| Trimmed Initial Accuracy | ±20 mV tolerance achieved via laser trimming-reduces system-level calibration overhead in production test. |
Applications
| Portable Digital Multimeter | Precision Thermocouple Cold-Junction Compensation |
|---|---|
Use Scenario: Handheld DMM requiring stable 2.5 V reference for 16-bit ADC conversion across 0°C–50°C ambient. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing excitation voltage for internal scaling resistor network and ADC reference input. Use Value: 30 ppm/°C tempco and 120 μVrms noise enable ±0.05% measurement accuracy without active temperature compensation. |
Use Scenario: Battery-powered thermocouple reader compensating cold-junction error using LM385Z-2.5/NOPB-derived current source. IC Role / Device Role / Timing Role: Reference element in 1.8 μA/K precision current source driving thermistor network for Kelvin-temperature sensing. Use Value: Micropower 20 μA min current allows continuous cold-junction tracking at <50 μA total system current, extending AA battery life to >2 years. |
| Micropower Data Logger Sensor Excitation | Low-Cost Industrial Analog Input Module |
Use Scenario: Remote environmental sensor node measuring RTD or bridge transducers with 10-year battery life target. IC Role / Device Role / Timing Role: Stable 2.5 V reference for programmable-gain instrumentation amplifier and SAR ADC reference rail. Use Value: 20 μA operating current and 0.6 Ω dynamic impedance ensure minimal error contribution during pulsed measurement cycles. |
Use Scenario: DIN-rail mounted PLC analog input card requiring cost-effective, reliable reference for multiple 12-bit channels. IC Role / Device Role / Timing Role: Primary voltage reference shared across channel multiplexers and sigma-delta modulators. Use Value: TO-92 package enables high-density PCB layout; ±20 mV tolerance eliminates per-channel trimming, reducing BOM and test time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-2.5/NOPB | Tighter initial tolerance (±10 mV vs. ±20 mV); same TO-92 package and 0°C–70°C rating. | Better suited for 14-bit+ systems requiring lower initial error; identical footprint and drive capability. | Select when higher accuracy justifies minor cost premium and no requalification is needed. |
| REF3025AIDBZR | 3-pin SOT-23 package; 50 ppm/°C max tempco; 3.8 μA typical quiescent current; 2.5 V output. | Lower power but higher tempco; requires different layout and decoupling; not pin-compatible. | Choose for ultra-low-power (<5 μA) applications where TO-92 mounting is impractical and 50 ppm/°C drift is acceptable. |
Compared with LM385BXZ-2.5/NOPB, the LM385Z-2.5/NOPB trades 10 mV initial accuracy for broader availability and lower unit cost; versus REF3025AIDBZR, it offers superior temperature stability and proven capacitive-load robustness at the expense of higher quiescent current and through-hole assembly.
Availability
LM385Z-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial analog input modules requiring stable component supply with full traceability and long-lifecycle support.
Supply support for LM385Z-2.5/NOPB 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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and reference design.
The LM385 series belongs to TI's micropower voltage reference product line, engineered specifically for battery-operated and space-constrained applications demanding high accuracy, low drift, and robust capacitive-load immunity.
FAQ
What is the operating temperature range for LM385Z-2.5/NOPB?
The LM385Z-2.5/NOPB is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with standard industrial control and consumer electronics environments. Its thermal resistance (θJA) is 440°C/W in TO-92 package, so power dissipation must remain below ~114 mW to avoid exceeding junction limits. The LM385Z-2.5/NOPB does not support extended or military temperature grades.
Can LM385Z-2.5/NOPB drive a 10 μF capacitor directly?
Yes-the LM385Z-2.5/NOPB is explicitly designed for exceptional capacitive-load tolerance and remains stable with up to 10 μF output capacitance. This capability eliminates the need for series isolation resistors in most applications, simplifying layout and improving transient response in battery-powered meters and data loggers using the LM385Z-2.5/NOPB as a reference source.
What is the minimum operating current required for LM385Z-2.5/NOPB to regulate properly?
The LM385Z-2.5/NOPB requires a minimum operating current of 20 μA to maintain regulation within specification. Below this threshold, output voltage drops nonlinearly and temperature coefficient degrades. In practice, designs targeting ultra-low-power operation (e.g., 30 μA standby) should verify regulation margin across temperature and supply variations using the LM385Z-2.5/NOPB's electrical characteristics table.
How does the pin configuration of LM385Z-2.5/NOPB differ from standard TO-92 op-amps?
Unlike op-amps, the LM385Z-2.5/NOPB is a 2-terminal device in a 3-pin TO-92 package: Pin 1 is Anode, Pin 2 is Cathode (output), and Pin 3 is the Die Attach Pad (DAP), which TI documentation states is internally connected to Pin 2. Layout best practice is to bond Pin 3 to Pin 2 or leave it unconnected-never float it independently, as that may compromise thermal performance or ESD robustness of the LM385Z-2.5/NOPB.
Is LM385Z-2.5/NOPB RoHS compliant and lead-free?
Yes-LM385Z-2.5/NOPB carries the "/NOPB" suffix, indicating TI's lead-free, RoHS-compliant packaging. It uses matte tin (Sn) lead finish per TI's eco plan, meets JEDEC MSL Level-1 rating, and is qualified for standard Pb-free reflow profiles (peak 260°C). The TO-92 package (LP0003A) is compatible with both wave and reflow soldering processes specified in TI's packaging documentation for LM385Z-2.5/NOPB.
LM385Z-2.5/NOPB 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:
- 150ppm/°C
- 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
LM385Z-2.5/NOPB FAQ
1.How can I place an order for LM385Z-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385Z-2.5/NOPB 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 LM385Z-2.5/NOPB reliable?
The price and inventory of LM385Z-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385Z-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385Z-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385Z-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385Z-2.5/NOPB?
LM385Z-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385Z-2.5/NOPB 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 LM385Z-2.5/NOPB?
For technical support, including LM385Z-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385Z-2.5/NOPB requirements.
6.How does Aetrix verify that LM385Z-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385Z-2.5/NOPB 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 LM385Z-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385Z-2.5/NOPB?
All LM385Z-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385Z-2.5/NOPB, 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 LM385Z-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385Z-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385Z-2.5/NOPB 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…
