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Texas Instruments LM285BXZ-1.2/NOPB
- Part No.:
- LM285BXZ-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285BXZ-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
LM285BXZ-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 over −40°C to +85°C. It operates from 10 μA to 20 mA, enabling use in battery-powered precision analog circuits such as portable meters and low-power regulators.
For engineers reviewing the LM285BXZ-1.2/NOPB datasheet, LM285BXZ-1.2/NOPB pinout, LM285BXZ-1.2/NOPB application, or LM285BXZ-1.2/NOPB equivalent, key selection considerations include its TO-92 package compatibility, micropower operation down to 10 μA, tight initial voltage tolerance, low dynamic impedance, and specified thermal stability across industrial temperature range.
Technical Context
The LM285BXZ-1.2/NOPB implements a band-gap reference architecture using only transistors and resistors, yielding low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm/1000 hr). Its two-terminal configuration simplifies integration into current-source or shunt-regulator topologies without requiring external bias components.
Designed for capacitive loading tolerance, it maintains regulation stability even with up to several microfarads of output capacitance-critical for noise-sensitive measurement systems. The device's wide operating current range (10 μA–20 mA) supports both ultra-low-power sensor interfaces and higher-current reference buffering applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures accurate calibration without post-manufacture trimming. |
| Initial Tolerance | ±1% at 25°C; enables direct use in precision 12-bit ADC references and portable instrument front-ends. |
| Operating Current | 10 μA to 20 mA; supports micropower designs (e.g., 9V battery-powered meters) and higher-current buffer stages. |
| Dynamic Impedance | 1 Ω at 100 μA; minimizes load-induced voltage shift in varying-current applications like thermocouple compensators. |
| Temp Coefficient | 30 ppm/°C (X-suffix); guarantees ≤0.25 mV drift over −40°C to +85°C, suitable for industrial-grade sensing. |
| Long-Term Stability | 20 ppm/1000 hr; ensures calibration integrity in deployed equipment without periodic recalibration. |
Pinout & Package
LM285BXZ-1.2/NOPB is housed in a TO-92 plastic package (JEDEC TO-226, LP drawing), with 3 leads and a maximum height of 5.34 mm. The device uses a standard 2-terminal configuration: anode and cathode only - the third lead is mechanically connected to the die attach pad and may be left floating or tied to cathode per layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current sink terminal | Connected to system ground or low-side current return path; defines reference potential node. |
| Cathode (Lead 2) | Reference output terminal | Provides stable 1.235 V relative to anode; used as precision voltage source for ADCs, comparators, or bias networks. |
| Lead 3 | Die attach pad connection | Internally bonded to substrate; electrically isolated from active circuitry - may be left unconnected or shorted to cathode for thermal/mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive loading tolerance | Stable with ≥1 μF output capacitance - eliminates need for series isolation resistor in noisy environments. |
| Micropower operation | Functional down to 10 μA supply current - extends shelf life of battery-powered devices (e.g., handheld multimeters). |
| Low noise performance | 60 μVrms (10 Hz–10 kHz) - preserves signal integrity in high-resolution data acquisition front-ends. |
| Hermetic-grade stability | 20 ppm/1000 hr long-term drift - reduces calibration maintenance in field-deployed instrumentation. |
| Industrial temperature range | −40°C to +85°C operation - qualified for use in automotive cabin sensors and industrial PLC analog I/O modules. |
Applications
| Portable Precision Meters | Low-Power Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Handheld digital multimeter measuring DC voltage with 0.1% accuracy over 10-year service life. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.235 V for 16-bit SAR ADC reference input and auto-zero amplifier bias. Use Value: ±1% initial tolerance and 20 ppm/1000 hr stability eliminate factory recalibration; 10 μA minimum current enables >5-year battery life on 9V alkaline cell. |
Use Scenario: Battery-operated environmental sensor node measuring temperature and humidity with 12-bit resolution. IC Role / Device Role / Timing Role: Precision reference for ratiometric bridge sensor excitation and ADC reference in ultra-low-power sleep/wake cycles. Use Value: 1 Ω dynamic impedance prevents gain error during transient sensor current draw; TO-92 package allows compact PCB layout in space-constrained enclosures. |
| Micropower Thermocouple Compensation | Calibration-Grade Reference Source |
|
Use Scenario: Industrial thermocouple transmitter operating from 3.3 V rail with cold-junction compensation. IC Role / Device Role / Timing Role: Stable 1.235 V reference driving precision 1 μA–1 mA current source for RTD-based ambient temperature sensing. Use Value: 30 ppm/°C tempco ensures <±0.5°C error over full industrial range; low noise avoids introducing offset drift in microvolt-level thermocouple signals. |
Use Scenario: Benchtop calibration source generating traceable 1.235 V output for lab-grade DMM verification. IC Role / Device Role / Timing Role: Primary voltage standard in a manually adjusted, zero-drift reference circuit with external trim capability. Use Value: Tight ±1% tolerance and 20 ppm/1000 hr stability meet ANSI Z540 requirements for secondary calibration standards without active temperature control. |
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 1.235 V reference, but rated for 0°C to 70°C; ±1% tolerance; identical TO-92 package and pinout. | Restricted to commercial temperature range; unsuitable for industrial or automotive under-hood use. | Select when cost sensitivity outweighs extended temperature requirement and ambient stays within 0°C–70°C. |
| REF191GS-1.2 | 1.2 V output, ±0.1% initial tolerance, 20 ppm/°C tempco, SOIC-8 package; requires external capacitor for stability. | Higher precision and lower tempco, but 3× higher quiescent current (65 μA typical) and surface-mount only. | Choose for metrology-grade accuracy where board space permits SOIC-8 and power budget allows >60 μA continuous draw. |
Compared with LM385BXZ-1.2/NOPB, LM285BXZ-1.2/NOPB offers broader industrial temperature support; compared with REF191GS-1.2, it delivers lower power consumption and through-hole assembly flexibility at the expense of absolute accuracy and tempco.
Availability
LM285BXZ-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and calibration-grade reference circuits requiring stable component supply with RoHS-compliant, lead-free (Sn) finish and full traceability.
Supply support for LM285BXZ-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 analog IC design and high-reliability manufacturing.
The LM285 series belongs to TI's micropower voltage reference product line, engineered specifically for battery-powered and space-constrained applications demanding low quiescent current, stable output, and robust thermal performance.
FAQ
What is the exact reference voltage and tolerance of LM285BXZ-1.2/NOPB?
The LM285BXZ-1.2/NOPB provides a nominal reference voltage of 1.235 V with a guaranteed initial tolerance of ±1% at 25°C. This value is confirmed in the Electrical Characteristics table of the SNVS742E datasheet under "Reverse Breakdown Voltage" test conditions (10 μA ≤ IR ≤ 20 mA), and applies specifically to the BX-grade variant marked "285BX Z-1.2".
Does LM285BXZ-1.2/NOPB require external components to operate?
No, LM285BXZ-1.2/NOPB is a 2-terminal shunt reference and requires only a current-setting resistor connected between supply and cathode. Its design tolerates capacitive loading up to ≥1 μF without oscillation, eliminating the need for series isolation resistors or compensation networks in most applications.
What is the operating temperature range for LM285BXZ-1.2/NOPB?
The LM285BXZ-1.2/NOPB is rated for operation from −40°C to +85°C, as explicitly stated in the "Operating Temperature Range" section of the SNVS742E datasheet and confirmed in TI's Package Option Addendum for this orderable device. This distinguishes it from the LM385 variant (0°C to 70°C) and LM185 (−55°C to 125°C).
Can LM285BXZ-1.2/NOPB be used in place of LM385BXZ-1.2/NOPB?
LM285BXZ-1.2/NOPB and LM385BXZ-1.2/NOPB share identical electrical specifications (1.235 V, ±1%, TO-92 package, same pinout), but differ in temperature rating: LM285BXZ-1.2/NOPB supports −40°C to +85°C, while LM385BXZ-1.2/NOPB is limited to 0°C to 70°C. Substitution is safe if ambient temperature remains within the narrower range.
What does the 'Z' suffix indicate in LM285BXZ-1.2/NOPB?
The 'Z' suffix in LM285BXZ-1.2/NOPB denotes the TO-92 package variant (LP drawing), as defined in TI's Package Option Addendum. It is distinct from 'M' (SOIC-8), 'MX' (SOIC-8 tape-and-reel), and 'H' (hermetic TO package), and confirms the device uses the molded plastic TO-92 housing with 3 leads and N/A moisture sensitivity level.
LM285BXZ-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:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285BXZ-1.2/NOPB FAQ
1.How can I place an order for LM285BXZ-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXZ-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 LM285BXZ-1.2/NOPB reliable?
The price and inventory of LM285BXZ-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 LM285BXZ-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXZ-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXZ-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXZ-1.2/NOPB?
LM285BXZ-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXZ-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 LM285BXZ-1.2/NOPB?
For technical support, including LM285BXZ-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXZ-1.2/NOPB requirements.
6.How does Aetrix verify that LM285BXZ-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXZ-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 LM285BXZ-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXZ-1.2/NOPB?
All LM285BXZ-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXZ-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 LM285BXZ-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285BXZ-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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