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Texas Instruments LM385BZ-2.5/NOPB
- Part No.:
- LM385BZ-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BZ-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,229
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Product details
Overview
LM385BZ-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance, and 30 ppm/°C average temperature coefficient over 0°C to 70°C. It operates from 20 μA to 20 mA supply current and is used in portable meters, battery-powered analog circuitry, and precision current sources.
For engineers reviewing the LM385BZ-2.5/NOPB datasheet, LM385BZ-2.5/NOPB pinout, LM385BZ-2.5/NOPB application, or LM385BZ-2.5/NOPB equivalent, key selection criteria include its TO-92 package compatibility, low quiescent current, tight initial accuracy, wide operating current range, and thermal stability in consumer-grade temperature environments.
Technical Context
The LM385BZ-2.5/NOPB uses a band-gap reference architecture with on-chip trimming for voltage accuracy. Its 2-terminal configuration simplifies design by eliminating separate input/output pins-current flows through the device to develop the regulated 2.5 V across it.
It exhibits exceptionally low dynamic impedance (0.6 Ω at 100 μA, 20 Hz), enabling stable operation under capacitive loading. The device achieves long-term stability of 20 ppm over 1000 hours and wideband noise of 120 μVrms (10 Hz–10 kHz), supporting high-resolution ADC biasing and calibration circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 25°C - ensures accurate scaling in 12-bit+ data acquisition systems |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sensor nodes and high-current reference buffering |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz - maintains regulation stability during transient load steps |
| Temp Coefficient | 30 ppm/°C (X suffix) - limits drift to <±1.05 mV over full 0°C–70°C range |
| Long-Term Stability | 20 ppm after 1000 hours - reduces recalibration frequency in field-deployed instrumentation |
| Wideband Noise | 120 μVrms, 10 Hz–10 kHz - avoids noise-induced errors in precision 16-bit ADC references |
Pinout & Package
LM385BZ-2.5/NOPB is housed in a 3-pin TO-92 plastic package (Package Drawing LP0003A). Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is connected to the die attach pad and may be left floating or tied to Pin 2 per TI recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current entry point; connects to unregulated supply rail |
| Pin 2 | Cathode | Reference output node; 2.5 V appears between Pin 2 and Pin 1 |
| Pin 3 | Die Attach Pad | Internally connected to substrate; electrically tied to Pin 2 or left floating per layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with >10 μF output capacitance - eliminates need for external isolation resistors in noisy environments |
| Micropower Operation | 20 μA minimum operating current - enables multi-year battery life in remote sensors |
| Low Dynamic Impedance | 0.6 Ω - minimizes voltage droop during fast-switching load transients |
| Hermetic Alternative Available | LM185H-2.5/NOPB variant offers −55°C to +125°C operation in TO package - supports industrial/military upgrades |
Applications
| Portable Digital Multimeter Reference | Low-Power Thermocouple Cold-Junction Compensation |
|---|---|
Use Scenario: Precision DC voltage measurement in handheld DMMs powered by 9 V alkaline batteries. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 16-bit sigma-delta ADC and auto-ranging circuitry. Use Value: Enables ±0.1% full-scale accuracy over battery discharge (6 V–9 V) and 0°C–40°C ambient without recalibration. | Use Scenario: Compensating thermocouple cold-junction drift in battery-operated temperature loggers. IC Role / Device Role / Timing Role: Supplies excitation current and reference voltage for precision thermistor-based compensation network. Use Value: Achieves ±0.5°C system accuracy over 0°C–70°C using <50 μA total quiescent current. |
| Micropower 5 V Regulator Feedback Divider | Precision 1 μA–1 mA Current Source |
Use Scenario: Setting feedback voltage in low-quiescent LDOs for IoT sensor nodes. IC Role / Device Role / Timing Role: Replaces resistor divider to eliminate temperature-dependent ratio drift in feedback path. Use Value: Maintains regulator output accuracy within ±0.5% across 0°C–70°C and 2.5 V–5.5 V input range. | Use Scenario: Generating calibrated bias currents for pH electrodes and photodiode transimpedance amps. IC Role / Device Role / Timing Role: Serves as stable voltage source driving precision current-setting resistor. Use Value: Delivers 1.000 μA ±1.5% over 0°C–70°C with <0.01%/V line regulation. |
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 | Same TO-92 package, ±20 mV tolerance, but 50 ppm/°C tempco (Y grade) | Higher drift in wide-temperature-range industrial logging | Select when cost sensitivity outweighs thermal stability requirements |
| LM385M3-2.5/NOPB | SOT-23-3 package, same 2.5 V/±20 mV spec, but 150 ppm/°C tempco (standard grade) | Not suitable for precision metrology; preferred for space-constrained PCBs | Choose for high-density layouts where TO-92 footprint is prohibitive |
Compared with LM385BXZ-2.5/NOPB and LM385M3-2.5/NOPB, the LM385BZ-2.5/NOPB delivers superior thermal stability (30 ppm/°C vs. 50/150 ppm/°C) while retaining identical TO-92 mechanical fit and initial accuracy-making it optimal for mid-tier portable instrumentation requiring long-term calibration integrity.
Availability
LM385BZ-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and precision analog front-ends requiring stable component supply across production lifecycles.
Supply support for LM385BZ-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 and embedded processing technologies, with decades of expertise in precision reference design.
The LM385 series was engineered specifically for micropower, low-drift voltage referencing in battery-critical and portable measurement applications-emphasizing accuracy, stability, and ease of use in 2-terminal configurations.
FAQ
What is the operating temperature range for LM385BZ-2.5/NOPB?
The LM385BZ-2.5/NOPB is rated for operation from 0°C to +70°C. This commercial-grade temperature range aligns with its intended use in portable test equipment, consumer-grade sensors, and non-industrial embedded systems. It is distinct from the LM285-2.5/NOPB (−40°C to +85°C) and LM185-2.5/NOPB (−55°C to +125°C), which target wider environmental envelopes.
Can LM385BZ-2.5/NOPB replace LM385Z-2.5/NOPB in existing designs?
Yes, LM385BZ-2.5/NOPB is a direct functional and pin-compatible replacement for LM385Z-2.5/NOPB. Both share identical TO-92 packaging, 2.5 V nominal output, ±20 mV initial tolerance, and 0°C to 70°C operating range. The "B" suffix denotes the X-grade temperature coefficient (30 ppm/°C), whereas standard "Z" grade has 150 ppm/°C-so upgrade is beneficial where thermal stability matters.
What is the minimum operating current required for LM385BZ-2.5/NOPB to regulate properly?
The LM385BZ-2.5/NOPB requires a minimum operating current of 20 μA to maintain regulation within specification. Below this threshold, output voltage deviates significantly from 2.5 V. At 100 μA, it achieves optimal dynamic impedance (0.6 Ω) and noise performance (120 μVrms). Designers must ensure bias networks or load paths sustain ≥20 μA under all operating conditions.
How does the LM385BZ-2.5/NOPB handle capacitive loads?
The LM385BZ-2.5/NOPB is explicitly designed for exceptional capacitive load tolerance-stable with >10 μF output capacitance without external series resistance. This stems from its internal compensation and low output impedance. Unlike many shunt references, it avoids oscillation or overshoot even with large ceramic or tantalum bypass caps, simplifying layout in noise-sensitive measurement circuits.
Is LM385BZ-2.5/NOPB RoHS compliant and lead-free?
Yes, LM385BZ-2.5/NOPB is RoHS compliant and lead-free. Per TI's Package Option Addendum, it carries the "/NOPB" suffix indicating lead-free finish (SnAgCu or Sn per TI documentation), conforms to EU RoHS Directive 2011/65/EU, and meets JS709B low-halogen requirements. It is rated MSL Level-1 with unlimited floor life under standard storage conditions.
LM385BZ-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:
- ±1.5%
- 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
LM385BZ-2.5/NOPB FAQ
1.How can I place an order for LM385BZ-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BZ-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 LM385BZ-2.5/NOPB reliable?
The price and inventory of LM385BZ-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 LM385BZ-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BZ-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BZ-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BZ-2.5/NOPB?
LM385BZ-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BZ-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 LM385BZ-2.5/NOPB?
For technical support, including LM385BZ-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BZ-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BZ-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BZ-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 LM385BZ-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BZ-2.5/NOPB?
All LM385BZ-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BZ-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 LM385BZ-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BZ-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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