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Texas Instruments LM285Z-1.2/NOPB
- Part No.:
- LM285Z-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285Z-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
LM285Z-1.2/NOPB from Texas Instruments is a 2-terminal micropower band-gap voltage reference diode delivering a precise 1.235 V output with ±1% initial tolerance, 1 Ω dynamic impedance, and operation across 10 μA–20 mA current range. It serves as a stable low-voltage reference in battery-powered portable meters, micropower regulators, and precision analog circuits operating from 1.5 V or 9 V sources.
For engineers reviewing the LM285Z-1.2/NOPB datasheet, LM285Z-1.2/NOPB pinout, LM285Z-1.2/NOPB application, or LM285Z-1.2/NOPB equivalent, key selection criteria include its −40°C to +85°C industrial temperature range, TO-92 package compatibility with legacy designs, low 30 μA typical quiescent current in 1.5 V battery references, and tight temperature coefficient options (30 ppm/°C for X-suffix variants).
Technical Context
The LM285Z-1.2/NOPB uses a band-gap core with on-chip trimming to achieve ±1% initial accuracy without external calibration. Its two-terminal architecture simplifies layout and eliminates need for bias resistors in many configurations, while capacitive loading tolerance enables direct use with bypass capacitors up to several microfarads.
Operating over a 10 μA–20 mA reverse current range, it maintains stable regulation across wide supply variations and exhibits low 60 μVrms wideband noise (10 Hz–10 kHz) and 20 ppm long-term stability after 1000 hours at 25°C - critical for precision instrumentation and calibration systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight tolerance enables accurate ADC/DAC biasing and sensor excitation without trimming. |
| Initial Tolerance | ±1% at 25°C; reduces system calibration burden in portable test equipment and data loggers. |
| Operating Current | 10 μA to 20 mA; supports ultra-low-power operation down to coin-cell levels and high-current stability in regulator feedback paths. |
| Dynamic Impedance | 1 Ω at 100 μA; ensures minimal load-induced voltage shift in precision current sources and ratiometric sensor bridges. |
| Temp Coefficient | 30 ppm/°C (X-suffix); guarantees ≤0.75 mV drift over −40°C to +85°C for industrial-grade measurement accuracy. |
| Long-Term Stability | 20 ppm over 1000 hours; maintains calibration integrity in field-deployed medical and environmental monitoring devices. |
Pinout & Package
LM285Z-1.2/NOPB is housed in a standard TO-92 plastic package (LP drawing), with three leads arranged in straight or formed configuration. Pin 1 is the cathode, Pin 2 is the anode, 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 | Cathode | Connected to regulated output node; reverse-biased during normal operation to establish reference voltage. |
| PIN 2 | Anode | Connected to ground or current sink; defines return path for reference current and sets reference polarity. |
| PIN 3 | Die Attach Pad | Internally bonded to substrate; electrically tied to Pin 2 - optional connection improves thermal dissipation and mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Loading Tolerance | Stable with ≥1 μF bypass capacitance - eliminates need for isolation resistors in battery-powered sensor front-ends. |
| Micropower Operation | 10 μA minimum operating current enables multi-year shelf-life operation from primary lithium cells. |
| Low Noise Performance | 60 μVrms (10 Hz–10 kHz) supports high-resolution 16-bit+ data acquisition without additional filtering. |
| Hermetic Alternative Available | LM285BXZ-1.2/NOPB variant offers same electrical specs in TO-92 with tighter 30 ppm/°C tempco for enhanced stability. |
| ESD Robustness | 2 kV HBM rating allows safe handling in standard assembly environments without special ESD protocols. |
Applications
| Portable Multimeter Reference | Low-Voltage Battery Monitor |
|---|---|
Use Scenario: Precision DC voltage measurement in handheld digital multimeters powered by 9 V alkaline batteries. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 1.235 V reference for 3½-digit ADC conversion. Use Value: Enables ±0.1% full-scale accuracy without trimming; 30 μA typical quiescent current extends battery life beyond 200 hours. |
Use Scenario: Monitoring state-of-charge in single-cell LiFePO₄ or NiMH battery packs with 1.2–1.6 V nominal voltage. IC Role / Device Role / Timing Role: Low-current reference for comparator-based voltage threshold detection and fuel gauging circuitry. Use Value: Stable 1.235 V reference ensures consistent trip points across temperature; operates reliably down to 10 μA supply current. |
| Micropower Thermometer | Calibration Standard for Field Instruments |
Use Scenario: Centigrade thermometer using LM385-1.2-N in Figure 23 of TI SNVS742E, adapted for LM285Z-1.2/NOPB's industrial temp range. IC Role / Device Role / Timing Role: Precision voltage source establishing Kelvin-per-millivolt scaling in thermistor-based temperature sensing. Use Value: 30 ppm/°C tempco limits error to <0.3°C over −40°C to +85°C; low power enables continuous logging in remote sensors. |
Use Scenario: Portable calibration tool for field service of pressure transmitters and RTD signal conditioners requiring traceable 1.2 V reference. IC Role / Device Role / Timing Role: Primary voltage standard in handheld calibrators where long-term drift directly impacts metrology validity. Use Value: 20 ppm/1000 hr stability ensures calibration validity between annual lab recertifications; TO-92 form factor fits compact handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385Z-1.2/NOPB | Same 1.235 V reference but rated for 0°C to 70°C commercial temperature range; otherwise identical TO-92 pinout and electrical specs. | Suitable for consumer electronics and non-industrial instrumentation where ambient temperature stays within 0–70°C. | Select when cost sensitivity outweighs extended temperature coverage and long-term stability requirements. |
| LM285BXZ-1.2/NOPB | Same TO-92 package and 1.235 V output, but ±1% tolerance with 30 ppm/°C tempco (X-suffix) vs. standard 150 ppm/°C for LM285Z-1.2/NOPB. | Required for applications demanding tighter thermal drift control, such as industrial process controllers and precision data loggers. | Choose when temperature-induced error must remain below 0.75 mV across full operating range. |
Compared with LM385Z-1.2/NOPB, LM285Z-1.2/NOPB provides extended −40°C to +85°C operation essential for outdoor or automotive-adjacent use; compared with LM285BXZ-1.2/NOPB, it trades tighter tempco for lower unit cost while retaining identical pinout and basic accuracy.
Availability
LM285Z-1.2/NOPB is available at Aetrix Electronics and suitable for portable test equipment, battery-powered sensor nodes, and industrial calibration tools requiring stable component supply with RoHS-compliant packaging and traceable sourcing.
Supply support for LM285Z-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 ICs and voltage references.
The LM285 series was designed specifically for micropower, industrial-temperature voltage reference applications where low drift, high accuracy, and robustness in space-constrained designs are critical.
FAQ
What is the operating temperature range of the LM285Z-1.2/NOPB?
The LM285Z-1.2/NOPB is rated for operation from −40°C to +85°C, making it suitable for industrial environments including factory automation, outdoor instrumentation, and automotive under-hood auxiliary systems where extended thermal performance is required. This range exceeds the 0°C to 70°C specification of the LM385Z-1.2/NOPB variant.
Does the LM285Z-1.2/NOPB require an external current-limiting resistor?
Yes - the LM285Z-1.2/NOPB is a 2-terminal shunt reference and requires an external series resistor to set the reverse bias current between 10 μA and 20 mA. The resistor value is calculated as (VSUPPLY − 1.235 V) / IREF, where IREF is selected based on desired stability, noise, and power constraints.
Can the LM285Z-1.2/NOPB be used with large output capacitors?
Yes - the LM285Z-1.2/NOPB is explicitly designed for exceptional capacitive loading tolerance, remaining stable with output capacitances up to several microfarads. This eliminates the need for isolation resistors in applications like battery monitors and portable meters where bulk decoupling is necessary.
What is the typical quiescent current of the LM285Z-1.2/NOPB in a 1.5 V battery application?
In a typical 1.5 V battery reference circuit (Figure 16, SNVS742E), the LM285Z-1.2/NOPB draws approximately 30 μA total system current, enabling multi-year operation from primary alkaline or lithium cells. This value includes both reference current and any associated divider or amplifier bias currents.
How does the LM285Z-1.2/NOPB differ from the LM285BXZ-1.2/NOPB?
The LM285Z-1.2/NOPB and LM285BXZ-1.2/NOPB share identical TO-92 packaging, 1.235 V nominal output, and ±1% initial tolerance, but the BXZ variant specifies a tighter 30 ppm/°C temperature coefficient (X-suffix) versus the standard 150 ppm/°C for the Z-suffix part - critical for applications demanding minimal thermal drift.
LM285Z-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:
- 10 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285Z-1.2/NOPB FAQ
1.How can I place an order for LM285Z-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285Z-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 LM285Z-1.2/NOPB reliable?
The price and inventory of LM285Z-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 LM285Z-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285Z-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285Z-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285Z-1.2/NOPB?
LM285Z-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285Z-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 LM285Z-1.2/NOPB?
For technical support, including LM285Z-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285Z-1.2/NOPB requirements.
6.How does Aetrix verify that LM285Z-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285Z-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 LM285Z-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285Z-1.2/NOPB?
All LM285Z-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285Z-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 LM285Z-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285Z-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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