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Texas Instruments LM336Z-2.5/LFT3
- Part No.:
- LM336Z-2.5/LFT3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM336Z-2.5/LFT3.pdf
- Description:
- IC VREF SHUNT 4% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,379
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Product details
Overview
LM336Z-2.5/LFT3 from Texas Instruments is a precision 2.5V shunt voltage reference diode in TO-92 package, rated for 0°C to +70°C operation, with ±1% initial tolerance, 0.2Ω dynamic impedance, and 400 μA to 10 mA operating current range. It serves as a stable low-voltage reference in digital voltmeters, op-amp biasing, and 5V-derived power supply monitoring circuits.
For engineers reviewing the LM336Z-2.5/LFT3 datasheet, LM336Z-2.5/LFT3 pinout, LM336Z-2.5/LFT3 application, or LM336Z-2.5/LFT3 equivalent, key selection criteria include temperature stability (≤6 mV over 0°C–70°C), low dynamic impedance, trimmable reference voltage, and compatibility with standard TO-92 PCB footprints and reflow profiles.
Technical Context
The LM336Z-2.5/LFT3 operates as a monolithic shunt regulator, functioning like a low-temperature-coefficient zener diode with internal bandgap-derived reference architecture. Its three-terminal configuration enables external trimming of both output voltage and temperature coefficient via an adjustment pin.
It delivers stable 2.5V regulation across a wide reverse current range without requiring series pass elements. The device exhibits fast turn-on behavior and supports both positive and negative reference configurations due to its bidirectional terminal functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V typical at 1 mA; ±1% initial tolerance ensures accurate calibration without post-production trimming in many applications. |
| Operating Current Range | 400 μA to 10 mA; supports low-power sensor interfaces and high-current reference buffering without external amplification. |
| Dynamic Impedance | 0.2 Ω typical at 1 mA; minimizes output voltage variation under load transients, critical for precision ADC reference rails. |
| Temperature Stability | ≤6 mV over 0°C to +70°C; enables stable performance in commercial-grade instrumentation without active compensation. |
| Initial Tolerance | ±1% (LM336Z grade); reduces system-level calibration burden in production test fixtures and embedded measurement subsystems. |
| Package | TO-92 (LP) with 3 pins; compatible with legacy through-hole assembly and automated tape-and-reel pick-and-place using standard LP0003A footprint. |
Pinout & Package
LM336Z-2.5/LFT3 uses the standard TO-92 plastic package (Package Number LP), with 3 leads and maximum height of 5.34 mm. Pin 1 is cathode, Pin 2 is anode, and Pin 3 is the adjust terminal - enabling precise voltage and temperature coefficient tuning.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Reference Output / High-Side Connection | Delivers regulated 2.5V when reverse-biased; connects to load or feedback node in shunt regulator topologies. |
| Pin 2 (Anode) | Current Return Path / Ground Reference | Serves as common return for bias current; must be tied to system ground or negative rail for proper regulation. |
| Pin 3 (Adjust) | Trim Control Terminal | Allows external resistor network to fine-tune reference voltage and minimize temperature drift; essential for metrology-grade accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Low Temperature Coefficient | Enables <6 mV drift over full commercial temperature range, reducing need for software compensation in portable instruments. |
| Easily Trimmed Reference | Third terminal allows hardware-based optimization of both voltage setpoint and thermal drift, supporting factory calibration workflows. |
| Wide Operating Current | 400 μA–10 mA range accommodates ultra-low-power IoT sensors and higher-current analog front-ends without redesign. |
| Fast Turn-On Response | Supports dynamic power sequencing in multi-rail systems where reference stability must be established before ADC or DAC initialization. |
| Shunt Regulator Architecture | Permits use as either positive or negative reference, simplifying bipolar supply designs and eliminating need for dedicated negative reference ICs. |
Applications
| Digital Voltmeter Reference | Op-Amp Precision Biasing |
|---|---|
Use Scenario: Used as primary reference in handheld DVMs measuring DC voltages from 0.1V to 100V with 4½-digit resolution. IC Role / Device Role / Timing Role: Provides stable 2.5V基准 for dual-slope or sigma-delta ADC conversion, directly determining full-scale accuracy. Use Value: ±1% initial tolerance and ≤6 mV tempco ensure <0.05% measurement error across operating temperature without recalibration. | Use Scenario: Supplies reference voltage to input bias networks of rail-to-rail op amps in signal conditioning stages. IC Role / Device Role / Timing Role: Sets common-mode voltage and gain-setting node in instrumentation amplifier configurations. Use Value: 0.2Ω dynamic impedance prevents loading-induced offset shifts during fast transient inputs, preserving linearity. |
| 5V Logic-Derived Power Monitor | Temperature-Compensated Sensor Interface |
Use Scenario: Monitors 5V supply integrity in microcontroller-based control modules by comparing against scaled-down 2.5V reference. IC Role / Device Role / Timing Role: Acts as stable threshold source for comparator-based brown-out detection circuitry. Use Value: Wide 400 μA–10 mA current range allows direct connection to comparator inputs without buffer op amp, saving board space. | Use Scenario: Provides excitation voltage and reference for RTD or thermistor bridges in HVAC controllers. IC Role / Device Role / Timing Role: Serves as ratiometric reference for bridge-to-ADC signal chains, rejecting supply variations. Use Value: Adjustable trim terminal enables matching of bridge sensitivity drift, achieving <0.1°C effective resolution over 0–70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.5V adjustable shunt regulator; requires external resistors for 2.5V setting; 0.22Ω dynamic impedance; wider 1–100 mA current range. | Not pin-compatible; needs two external resistors; better suited for programmable references or higher-current loads. | Select TL431ACDBVR when adjustable output or >10 mA sink capability is required; avoid if board space or BOM count reduction is critical. |
| REF3025AIDBZR | 2.5V precision series reference; 50 ppm/°C max tempco; 50 μA quiescent current; SO-3 package. | Series topology requires different PCB layout; not shunt-compatible; lower noise but no trim terminal. | Choose REF3025AIDBZR for ultra-low-noise, low-quiescent applications where shunt topology is not mandated; verify thermal design for series dropout. |
Compared with TL431ACDBVR and REF3025AIDBZR, the LM336Z-2.5/LFT3 offers direct 2.5V output without external components, a trim terminal for drift optimization, and TO-92 compatibility-making it optimal for cost-sensitive, space-constrained, and calibration-flexible commercial instrumentation designs.
Availability
LM336Z-2.5/LFT3 is available at Aetrix Electronics and suitable for digital multimeters, industrial sensor signal conditioners, and 5V-powered microcontroller reference rails requiring stable component supply across volume production cycles.
Supply support for LM336Z-2.5/LFT3 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 expertise in precision analog ICs and voltage references.
The LM336 family was designed specifically for commercial-grade precision shunt references-emphasizing ease of use, trimmability, and robustness in measurement, power monitoring, and op-amp biasing applications.
FAQ
What is the operating temperature range for LM336Z-2.5/LFT3?
The LM336Z-2.5/LFT3 is specified for operation from 0°C to +70°C. This commercial-grade temperature range aligns with its intended use in non-military, non-automotive instrumentation and consumer electronics. Its temperature stability is guaranteed at ≤6 mV over this interval, and the device's thermal resistance (θJA = 180°C/W) supports reliable operation on standard FR-4 PCBs without heatsinking.
Can LM336Z-2.5/LFT3 be used as a negative voltage reference?
Yes, the LM336Z-2.5/LFT3 can function as a negative voltage reference by reversing its polarity: connect Pin 2 (anode) to the negative rail and Pin 1 (cathode) to the circuit node requiring −2.5V. Its shunt regulator architecture supports bidirectional operation, making it suitable for dual-supply op-amp biasing and bipolar data acquisition systems without additional components.
How do I adjust the reference voltage of LM336Z-2.5/LFT3?
To adjust the reference voltage of LM336Z-2.5/LFT3, connect a potentiometer between Pin 3 (adjust) and Pin 2 (anode), with the wiper tied to Pin 1 (cathode). Typical values range from 2 kΩ to 20 kΩ. Adjusting to 2.490 V minimizes temperature coefficient. The LM336Z-2.5/LFT3 datasheet Figure 14 provides the exact schematic, and trimming does not affect long-term stability or dynamic impedance.
What is the maximum reverse current rating for LM336Z-2.5/LFT3?
The absolute maximum reverse current for LM336Z-2.5/LFT3 is 15 mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 400 μA to 10 mA, where dynamic impedance remains near 0.2 Ω and temperature stability is optimized. Exceeding 10 mA may increase self-heating and degrade long-term drift, while currents below 400 μA risk unstable regulation.
Is LM336Z-2.5/LFT3 RoHS compliant and lead-free?
Yes, LM336Z-2.5/LFT3 is RoHS compliant and lead-free, as confirmed in TI's Package Option Addendum. Its lead finish is specified as "SN" (tin), and it carries the "/NOPB" suffix in compliant variants. The /LFT3 suffix denotes tape-and-reel packaging with lead-free termination, meeting JEDEC J-STD-020 moisture sensitivity Level-1 requirements for standard reflow processes.
LM336Z-2.5/LFT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.49V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±4%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM336Z-2.5/LFT3 FAQ
1.How can I place an order for LM336Z-2.5/LFT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336Z-2.5/LFT3 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 LM336Z-2.5/LFT3 reliable?
The price and inventory of LM336Z-2.5/LFT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM336Z-2.5/LFT3 is usually 5 days.
3.What payment methods are accepted for LM336Z-2.5/LFT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336Z-2.5/LFT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336Z-2.5/LFT3?
LM336Z-2.5/LFT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336Z-2.5/LFT3 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 LM336Z-2.5/LFT3?
For technical support, including LM336Z-2.5/LFT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336Z-2.5/LFT3 requirements.
6.How does Aetrix verify that LM336Z-2.5/LFT3 is sourced from the original manufacturer or authorized distributors?
All LM336Z-2.5/LFT3 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 LM336Z-2.5/LFT3 meets industry standards.
7.What is the process for return or replacement of LM336Z-2.5/LFT3?
All LM336Z-2.5/LFT3 units undergo pre-shipment inspection (PSI). If there is an issue with LM336Z-2.5/LFT3, 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 LM336Z-2.5/LFT3 part is unused and in its original packaging.
Return procedure for LM336Z-2.5/LFT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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