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Texas Instruments LM285BXZ-1.2/LFT4
- Part No.:
- LM285BXZ-1.2/LFT4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285BXZ-1.2/LFT4.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
LM285BXZ-1.2/LFT4 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 (X-suffix). It operates over 10 μA to 20 mA current range and −40°C to +85°C ambient temperature, enabling use in battery-powered precision analog circuits such as portable meters and low-power sensor interfaces.
For engineers reviewing the LM285BXZ-1.2/LFT4 datasheet, LM285BXZ-1.2/LFT4 pinout, LM285BXZ-1.2/LFT4 application, or LM285BXZ-1.2/LFT4 equivalent, key selection criteria include its TO-92 (LP) 3-pin package, micropower operation down to 10 μA, tight voltage tolerance, low noise (60 μVrms), and compatibility with capacitive loads without instability.
Technical Context
The LM285BXZ-1.2/LFT4 implements a band-gap reference architecture using only transistors and resistors, yielding low noise and excellent long-term stability (20 ppm/1000 hr). Its design eliminates need for external compensation, supporting stable operation with up to several microfarads of capacitive loading.
It functions as a 2-terminal shunt reference: anode connects to ground, cathode to regulated node via series resistor; regulation occurs by sinking precisely controlled current to maintain 1.235 V across its terminals. The X-suffix denotes 30 ppm/°C max temperature coefficient, validated across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight regulation enables precision ADC/DAC biasing and sensor excitation. |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test and field-trimmed systems. |
| Operating Current | 10 μA to 20 mA; supports ultra-low-power (e.g., 9V battery life near shelf life) and higher-current regulator applications. |
| Dynamic Impedance | 1 Ω typical at 100 μA; ensures minimal output voltage shift under load transients. |
| Temp Coefficient | 30 ppm/°C (X-suffix); guarantees ≤1.2 mV drift over full −40°C to +85°C operating range. |
| Long-Term Stability | 20 ppm/1000 hr; maintains accuracy in deployed instrumentation without recalibration. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); suitable for high-resolution data acquisition where reference noise limits SNR. |
Pinout & Package
LM285BXZ-1.2/LFT4 is housed in a TO-92 (LP) molded plastic package with 3 leads. Pin 1 is emitter/anode (ground), Pin 2 is collector/cathode (output), and Pin 3 is internally connected to the die attach pad - it may be left floating or tied to Pin 2 per TI recommendation for thermal or mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Emitter) | Connected to system ground; forms return path for reference current. |
| Pin 2 | Cathode (Collector) | Output terminal; voltage referenced to Pin 1; connects to regulated node via series resistor. |
| Pin 3 | Die Attach Pad | Internally bonded to substrate; electrically isolated but thermally conductive; tie to Pin 2 or float per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with >1 μF output capacitance; eliminates need for external isolation resistor in most designs. |
| Micropower Operation | Functional down to 10 μA supply current; extends battery life in portable and remote sensors. |
| Low Dynamic Impedance | 1 Ω typical; minimizes voltage droop during transient load steps in precision references. |
| Tight Temp Coefficient | 30 ppm/°C (X-suffix); meets industrial-grade stability requirements without external compensation. |
| On-Chip Trimming | Laser-trimmed during production; achieves ±1% initial accuracy without post-assembly calibration. |
Applications
| Portable Multimeters | Precision Temperature Sensors |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 1.235 V reference for 4½-digit ADC conversion across varying battery voltage (6–9 V). IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling reference for dual-slope or sigma-delta converter. Use Value: ±1% tolerance and 30 ppm/°C drift ensure <0.02% measurement error over temperature and battery discharge. | Use Scenario: RTD or thermistor-based temperature transmitter operating from 3.3 V rail in industrial process monitoring. IC Role / Device Role / Timing Role: Precision bias source for ratiometric bridge excitation and ADC reference in 4–20 mA loop-powered design. Use Value: 10 μA minimum operating current enables operation even during brownout; low noise preserves 0.1°C resolution. |
| Micropower Data Loggers | Low-Voltage Battery Monitors |
Use Scenario: Solar-charged environmental logger with 1.5 V alkaline backup, sampling every 10 minutes. IC Role / Device Role / Timing Role: Reference for ultra-low-quiescent LDO feedback divider and ADC reference in sleep/wake cycle. Use Value: Stable 1.235 V output at 15 μA allows continuous reference operation while consuming <0.5 μW - negligible vs. MCU sleep current. | Use Scenario: Coin-cell-powered IoT node monitoring Li-ion cell voltage (2.5–4.2 V) with 12-bit ADC. IC Role / Device Role / Timing Role: Fixed reference for ADC input scaling and threshold detection in battery fuel-gauge circuit. Use Value: 1 Ω dynamic impedance prevents reading errors during brief ADC sampling bursts; TO-92 footprint simplifies compact PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM285BZ-1.2/NOPB | Same TO-92 package, ±1% tolerance, but Y-suffix (50 ppm/°C tempco) and no /LFT4 tape-and-reel packaging. | Acceptable where wider temperature drift is tolerable (e.g., consumer-grade devices), but not for industrial temp range. | Select LM285BXZ-1.2/LFT4 when 30 ppm/°C stability and factory tape-and-reel delivery are required. |
| TLVH431ACDBVR | Adjustable 3-terminal shunt reference (1.24 V min), 2% initial tolerance, 100 ppm/°C, SOT-23-3 package. | Requires external resistors for fixed 1.235 V; higher tempco and tolerance increase calibration overhead. | Choose only if adjustable output or SOT-23 footprint is mandatory; LM285BXZ-1.2/LFT4 offers superior accuracy and simpler 2-terminal interface. |
Compared with LM285BZ-1.2/NOPB and TLVH431ACDBVR, LM285BXZ-1.2/LFT4 delivers tighter temperature stability and guaranteed tape-and-reel logistics support, making it optimal for volume production of industrial-grade portable instruments requiring minimal calibration and consistent assembly feed.
Availability
LM285BXZ-1.2/LFT4 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial data loggers requiring stable component supply, long-lifecycle assurance, and RoHS-compliant TO-92 packaging.
Supply support for LM285BXZ-1.2/LFT4 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 heritage in precision analog ICs.
LM285BXZ-1.2/LFT4 belongs to TI's micropower shunt voltage reference product line, designed specifically for low-cost, high-stability, 2-terminal reference needs in space- and power-constrained applications.
FAQ
What is the exact reference voltage and tolerance of LM285BXZ-1.2/LFT4?
The LM285BXZ-1.2/LFT4 provides a nominal reference voltage of 1.235 V with ±1% initial tolerance at 25°C, as specified in the Electrical Characteristics table of the SNVS742E datasheet. This tolerance applies across the full operating current range (10 μA to 20 mA) and is production-tested, ensuring predictable performance without post-manufacture trimming.
Does LM285BXZ-1.2/LFT4 require external capacitors for stability?
No, LM285BXZ-1.2/LFT4 does not require external capacitors for stability. Its internal design is exceptionally tolerant of capacitive loading - it remains stable with output capacitances exceeding 1 μF. This eliminates the need for isolation resistors or compensation networks commonly required with older reference diodes.
What is the operating temperature range and thermal specification for LM285BXZ-1.2/LFT4?
LM285BXZ-1.2/LFT4 is rated for operation from −40°C to +85°C ambient temperature. Its thermal resistance θJA is 440°C/W in the TO-92 (LP) package. The device uses an X-suffix temperature coefficient of 30 ppm/°C, meaning maximum voltage drift over its full temperature range is approximately ±1.2 mV relative to the 25°C value.
Can LM285BXZ-1.2/LFT4 be used with a 1.5 V battery supply?
Yes, LM285BXZ-1.2/LFT4 can operate from a 1.5 V battery. With a 1.235 V reference voltage and minimum operating current of 10 μA, the required headroom is minimal - a series resistor of ~26.5 kΩ yields 10 μA at 1.5 V, enabling direct use in single-cell alkaline or lithium coin-cell applications as shown in Figure 16 of the datasheet.
What does the "/LFT4" suffix indicate in LM285BXZ-1.2/LFT4?
The "/LFT4" suffix denotes a specific packaging configuration: TO-92 (LP) package supplied in large tape-and-reel format (2000 units per reel), RoHS-compliant, with lead finish specified as "Call TI" (typically matte tin), and intended for automated SMT placement. It is distinct from /NOPB (bulk) variants and confirms factory-qualified logistics readiness for high-volume manufacturing.
LM285BXZ-1.2/LFT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Tray
- 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/LFT4 FAQ
1.How can I place an order for LM285BXZ-1.2/LFT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXZ-1.2/LFT4 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/LFT4 reliable?
The price and inventory of LM285BXZ-1.2/LFT4 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/LFT4 is usually 5 days.
3.What payment methods are accepted for LM285BXZ-1.2/LFT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXZ-1.2/LFT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXZ-1.2/LFT4?
LM285BXZ-1.2/LFT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXZ-1.2/LFT4 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/LFT4?
For technical support, including LM285BXZ-1.2/LFT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXZ-1.2/LFT4 requirements.
6.How does Aetrix verify that LM285BXZ-1.2/LFT4 is sourced from the original manufacturer or authorized distributors?
All LM285BXZ-1.2/LFT4 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/LFT4 meets industry standards.
7.What is the process for return or replacement of LM285BXZ-1.2/LFT4?
All LM285BXZ-1.2/LFT4 units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXZ-1.2/LFT4, 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/LFT4 part is unused and in its original packaging.
Return procedure for LM285BXZ-1.2/LFT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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