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Texas Instruments LM385BZ-1.2/NOPB
- Part No.:
- LM385BZ-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BZ-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,962
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Product details
Overview
LM385BZ-1.2/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering a precise 1.235 V output with ±1% initial tolerance, 1 Ω dynamic impedance, and 30 ppm/°C temperature coefficient across 0°C to 70°C. It operates over a 10 μA–20 mA current range and enables ultra-low-power analog circuits such as portable battery-powered thermometers and precision current sources.
For engineers reviewing the LM385BZ-1.2/NOPB datasheet, LM385BZ-1.2/NOPB pinout, LM385BZ-1.2/NOPB application, or LM385BZ-1.2/NOPB equivalent, key selection criteria include its TO-92 package compatibility, low 10 μA minimum operating current, tight 1.235 V reference accuracy, and suitability for micropower calibration and sensor biasing in space-constrained designs.
Technical Context
The LM385BZ-1.2/NOPB uses on-chip trimming to achieve ±1% initial voltage tolerance at 25°C and maintains stability via band-gap architecture with only transistors and resistors-ensuring low noise and long-term drift of 20 ppm over 1000 hours. Its 1 Ω dynamic impedance supports stable regulation under varying load currents.
Designed for operation from 0°C to 70°C, it exhibits a maximum average temperature coefficient of 150 ppm/°C (standard grade), with tighter 30 ppm/°C available in X-suffix variants. The device tolerates capacitive loading without oscillation and features built-in ESD protection rated at 2 kV (HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; enables accurate 1.2 V system biasing and Kelvin-scale temperature sensing. |
| Initial Tolerance | ±1% at 25°C; reduces calibration overhead in production test for portable meters and sensor front-ends. |
| Operating Current Range | 10 μA to 20 mA; supports micropower standby (e.g., 30 μA in 9 V battery references) and higher-current regulator feedback loops. |
| Dynamic Impedance | 1 Ω at 100 μA; ensures minimal output voltage shift under transient load changes in precision ADC references. |
| Temperature Coefficient | 150 ppm/°C max (standard); guarantees ≤1.2 mV drift over full 0°C–70°C industrial range for stable sensor excitation. |
| Long-Term Stability | 20 ppm over 1000 hours; minimizes recalibration frequency in field-deployed instrumentation. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); suitable for low-noise signal conditioning without external filtering. |
Pinout & Package
LM385BZ-1.2/NOPB is housed in a 3-pin TO-92 plastic package (LP drawing), with leads formed for through-hole mounting. Pin 1 is anode, Pin 2 is cathode, and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per TI design guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node; reverse-biased configuration establishes reference voltage at cathode. |
| Pin 2 | Cathode | Provides regulated 1.235 V output; must be decoupled with ≥0.1 μF capacitor for stability in noisy environments. |
| Pin 3 | Die Attach Pad | Internally bonded to substrate; electrically isolated but thermally coupled-may be grounded or left floating per layout requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 10 μA minimum operating current enables multi-year battery life in handheld calibrators and remote sensors. |
| Capacitive Load Tolerance | Stable with >1 μF output capacitance-eliminates need for series isolation resistors in battery-monitoring circuits. |
| Low Dynamic Impedance | 1 Ω impedance ensures <1 mV error under 1 mA load step-critical for high-resolution 16-bit+ SAR ADC references. |
| Tight Initial Accuracy | ±1% tolerance reduces post-manufacture trimming cost in medical-grade thermistor interfaces and portable DMMs. |
| Band-Gap Architecture | Transistor/resistor-only design delivers <20 ppm/1000 hr drift-ideal for unattended environmental data loggers. |
Applications
| Portable Thermometer Calibration | Precision Current Source |
|---|---|
Use Scenario: Calibrating 0°C–100°C centigrade thermometers using LM385BZ-1.2/NOPB as a 1.235 V reference to set 1 μA/°K current through thermistor networks. IC Role / Device Role / Timing Role: Voltage reference establishing exact current scaling factor for linear temperature-to-voltage conversion. Use Value: Enables ±0.1°C measurement accuracy without external trimmers due to ±1% initial tolerance and low 150 ppm/°C drift. | Use Scenario: Generating stable 1 μA–1 mA bias currents for photodiode amplifiers and RTD excitation in industrial transmitters. IC Role / Device Role / Timing Role: Precision voltage source feeding op-amp-based Howland or Wilson current mirror topologies. Use Value: Delivers <0.5% current error over 0°C–70°C, eliminating need for active temperature compensation in 4–20 mA loop designs. |
| Micropower Battery Monitor | Low-Voltage Sensor Biasing |
Use Scenario: Monitoring 1.5 V alkaline cell voltage in wireless sensor nodes by comparing against LM385BZ-1.2/NOPB reference in a comparator circuit. IC Role / Device Role / Timing Role: Stable threshold reference enabling accurate end-of-life detection at 1.1 V cutoff. Use Value: Draws only 10 μA quiescent current-extends node lifetime beyond 5 years on a single AA cell. | Use Scenario: Biasing MEMS pressure sensors requiring stable 1.2 V excitation in automotive cabin air quality modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing Zener diodes in ratiometric sensor bridges. Use Value: 60 μVrms noise and 20 ppm/1000 hr stability prevent false fault triggers during extended vehicle runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-1.2/NOPB | Same TO-92 package and 1.235 V output, but ±2% initial tolerance and 50 ppm/°C tempco (Y-suffix). | Suitable for cost-sensitive consumer electronics where ±2% accuracy suffices. | Select when budget constraints outweigh precision needs and thermal drift below 50 ppm/°C is not required. |
| REF3012AIDBZR | 1.2 V output, ±0.2% tolerance, 50 ppm/°C, SOT-23-3, 50 μA typical IQ-higher accuracy but higher quiescent current. | Better for high-precision data acquisition where 0.2% tolerance justifies added power cost. | Choose when system-level accuracy demands sub-0.5% error and PCB space allows SOT-23 footprint. |
Compared with LM385BXZ-1.2/NOPB, LM385BZ-1.2/NOPB provides tighter ±1% tolerance and lower 150 ppm/°C drift-critical for calibrated instruments-while REF3012AIDBZR offers superior accuracy at higher IQ and different package, making it unsuitable for ultra-low-power legacy TO-92 layouts.
Availability
LM385BZ-1.2/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 industrial temperature ranges.
Supply support for LM385BZ-1.2/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 voltage references and low-power analog ICs.
The LM385 family was designed specifically for micropower, low-drift voltage referencing in portable and battery-operated systems-prioritizing ultra-low IQ, wide current range, and robust capacitive-load stability.
FAQ
What is the exact reference voltage and tolerance of LM385BZ-1.2/NOPB?
The LM385BZ-1.2/NOPB delivers a nominal reference voltage of 1.235 V with a guaranteed initial tolerance of ±1% at 25°C. This specification is production-tested and applies across the full 0°C to 70°C operating temperature range, enabling predictable performance in portable meter and sensor calibration designs without post-assembly trimming.
Can LM385BZ-1.2/NOPB operate from a 1.5 V battery?
Yes, LM385BZ-1.2/NOPB can operate from a 1.5 V battery as shown in Figure 16 of the official datasheet. With a minimum operating current of 10 μA and forward voltage drop under reverse bias well below 1.5 V, it functions reliably down to ~1.3 V input-making it ideal for single-cell alkaline or lithium primary battery applications like handheld thermometers.
What is the recommended output capacitor for LM385BZ-1.2/NOPB stability?
Texas Instruments recommends a minimum 0.1 μF ceramic capacitor from cathode (Pin 2) to ground for stability, especially in noisy environments. The LM385BZ-1.2/NOPB is exceptionally tolerant of capacitive loading-supporting up to 1 μF or more without oscillation-enabling direct use in battery-monitoring comparators without series isolation resistors.
How does LM385BZ-1.2/NOPB compare to LM385Z-1.2/NOPB?
LM385BZ-1.2/NOPB features ±1% initial tolerance and is part of the 'B' grade, while LM385Z-1.2/NOPB is the standard grade with ±2% tolerance. Both share identical TO-92 packaging, 0°C–70°C temperature range, and electrical characteristics except for initial accuracy and temperature coefficient-LM385BZ-1.2/NOPB specifies 150 ppm/°C max, whereas LM385Z-1.2/NOPB does not guarantee tighter drift.
Is LM385BZ-1.2/NOPB RoHS compliant and lead-free?
Yes, LM385BZ-1.2/NOPB is RoHS compliant and lead-free, as confirmed by Texas Instruments' packaging addendum: "Green (RoHS & no Sb/Br)" with "SN" (matte tin) lead finish, and MSL rating "N/A for Pkg Type" for the TO-92 package. It meets current EU RoHS requirements for all 10 restricted substances.
LM385BZ-1.2/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):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- 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
LM385BZ-1.2/NOPB FAQ
1.How can I place an order for LM385BZ-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BZ-1.2/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-1.2/NOPB reliable?
The price and inventory of LM385BZ-1.2/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-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BZ-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BZ-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BZ-1.2/NOPB?
LM385BZ-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BZ-1.2/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-1.2/NOPB?
For technical support, including LM385BZ-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BZ-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BZ-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BZ-1.2/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-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BZ-1.2/NOPB?
All LM385BZ-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BZ-1.2/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-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BZ-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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