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Texas Instruments LM336Z-2.5/LFT1
- Part No.:
- LM336Z-2.5/LFT1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM336Z-2.5/LFT1.pdf
- Description:
- IC VREF SHUNT 4% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
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Product details
Overview
LM336Z-2.5/LFT1 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-supply-derived reference circuits.
For engineers reviewing the LM336Z-2.5/LFT1 datasheet, LM336Z-2.5/LFT1 pinout, LM336Z-2.5/LFT1 application, or LM336Z-2.5/LFT1 equivalent, key selection criteria include temperature stability (≤6 mV over 0°C–70°C), low dynamic impedance for noise-sensitive regulation, trimmable reference voltage, and compatibility with standard TO-92 PCB footprints and reflow profiles.
Technical Context
The LM336Z-2.5/LFT1 operates as a monolithic 2.5V zener-based shunt regulator with integrated temperature compensation. Its three-terminal structure enables external trimming of both output voltage and temperature coefficient via an adjustment terminal.
It delivers stable regulation across a wide reverse current range (400 μA–10 mA) without requiring series pass elements, and achieves low 0.2Ω dynamic impedance at 1 mA, minimizing output voltage variation under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V (typical, trimmed); ±1% initial tolerance ensures accurate calibration without post-assembly trimming in most applications. |
| Operating Current Range | 400 μA to 10 mA; supports low-power sensor interfaces and high-current reference buffering without external current limiting. |
| Dynamic Impedance | 0.2 Ω (at 1 mA); maintains tight voltage regulation despite rapid load current changes, critical for ADC reference stability. |
| Temperature Stability | ≤6 mV over 0°C to +70°C; enables use in commercial-grade instrumentation without active thermal management. |
| Initial Tolerance | ±1% (LM336Z grade); reduces system-level calibration burden in production test fixtures and embedded measurement subsystems. |
| Package | TO-92 (LP); industry-standard through-hole footprint compatible with legacy assembly lines and manual prototyping. |
Pinout & Package
LM336Z-2.5/LFT1 is housed in a 3-pin TO-92 plastic package (JEDEC TO-226AA, TI package code LP), with leads formed for tape-and-reel automated insertion. Thermal resistance θJA is 180°C/W (0.4″ leads).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink terminal | Connects to system ground or negative rail; defines reference polarity when used as negative reference. |
| Cathode (Pin 2) | Output/reference node | Provides stable 2.5V output relative to Anode; requires external current-limiting resistor from supply. |
| Adjust (Pin 3) | Trim control terminal | Enables fine-tuning of reference voltage and temperature coefficient using external potentiometer or diode network per Figure 14/15. |
Key Features
| Feature | Design Value |
|---|---|
| Low temperature coefficient | Stability ≤6 mV over full 0°C–70°C range enables drift-critical analog front-ends without external compensation. |
| Easily trimmed reference | Third terminal allows independent adjustment of output voltage and temperature coefficient-no trade-off between accuracy and thermal performance. |
| Wide operating current | 400 μA–10 mA range accommodates ultra-low-power IoT sensors and high-drive buffer stages without redesign. |
| Fast turn-on | Sub-microsecond response to current step changes ensures stable reference during power-up sequencing and wake-from-sleep transitions. |
| Shunt topology | Operates as two-terminal device when Adjust pin is unused; simplifies layout and eliminates need for series pass transistor in basic applications. |
Applications
| Digital Voltmeter Reference | Op-Amp Precision Biasing |
|---|---|
Use Scenario: Provides stable 2.5V reference for 12-bit SAR ADC in handheld DVMs powered from 9V battery. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute scaling for analog-to-digital conversion. Use Value: ±1% initial tolerance and ≤6 mV tempco ensure <0.5% full-scale error across operating temperature without recalibration. | Use Scenario: Sets precise common-mode voltage for rail-to-rail input op-amp driving 4–20 mA transmitter loop. IC Role / Device Role / Timing Role: Low-impedance DC bias source for op-amp input stage. Use Value: 0.2Ω dynamic impedance prevents signal-dependent offset shift during fast output slewing. |
| 5V Logic-Derived Reference | Temperature-Compensated Sensor Excitation |
Use Scenario: Generates clean 2.5V reference from noisy 5V microcontroller supply for analog sensor interface. IC Role / Device Role / Timing Role: Shunt regulator isolating sensitive analog circuitry from digital supply noise. Use Value: Wide 400 μA–10 mA current range allows optimal resistor selection to reject supply ripple while maintaining regulation. | Use Scenario: Supplies excitation voltage to platinum RTD bridge in HVAC controller with <±0.1°C accuracy requirement. IC Role / Device Role / Timing Role: Trimmed reference source with minimized temperature drift. Use Value: Adjust pin enables tuning to 2.490V for near-zero tempco, reducing RTD linearization error by >40% vs. untrimmed unit. |
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; 2% initial tolerance, 0.22Ω dynamic impedance, SO-8 package. | Requires external resistors for 2.5V setting; no dedicated trim terminal; higher minimum cathode current (1 mA). | Preferred for SMT-only designs where board space is constrained and ±2% tolerance is acceptable. |
| LM385BZ-2.5/LFT1 | 2.5V micropower shunt reference; 1% tolerance, 1.5Ω dynamic impedance, TO-92 package, 10 μA–20 mA current range. | Higher dynamic impedance limits use in high-speed ADC references; optimized for sub-100 μA systems. | Selected when ultra-low quiescent current is mandatory and regulation bandwidth is secondary. |
Compared with TL431ACDBVR and LM385BZ-2.5/LFT1, the LM336Z-2.5/LFT1 uniquely combines TO-92 through-hole compatibility, dedicated trim terminal for simultaneous voltage/tempco optimization, and 0.2Ω impedance-making it optimal for cost-sensitive, medium-speed, field-serviceable instrumentation where layout flexibility and calibration precision are prioritized.
Availability
LM336Z-2.5/LFT1 is available at Aetrix Electronics and suitable for digital multimeters, industrial sensor signal conditioning, and 5V-based analog front-ends requiring stable component supply and long-term calibration integrity.
Supply support for LM336Z-2.5/LFT1 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 company specializing in analog, embedded processing, and logic ICs, with leadership in precision analog design and automotive-grade reliability.
The LM336 family was developed for commercial-grade precision voltage referencing in cost-sensitive instrumentation and industrial control systems where trimmability, low impedance, and TO-92 compatibility are essential.
FAQ
What is the operating temperature range of the LM336Z-2.5/LFT1?
The LM336Z-2.5/LFT1 is specified for operation from 0°C to +70°C. This commercial-grade range aligns with its LM336 designation and is validated per the SNVS749F datasheet. Exceeding this range may cause voltage drift beyond the guaranteed 6 mV stability spec. The LM336Z-2.5/LFT1 does not support extended or industrial temperature grades-those require LM236 or LM136 variants.
Can the LM336Z-2.5/LFT1 be used as a negative voltage reference?
Yes, the LM336Z-2.5/LFT1 can function as a negative voltage reference by connecting its Anode (Pin 1) to the positive supply and Cathode (Pin 2) to the circuit's "ground" node, resulting in −2.5V referenced to system ground. Its shunt architecture supports bidirectional polarity use, and the Adjust pin (Pin 3) remains functional for trimming in either configuration per Figure 19 of the datasheet.
How do I connect the Adjust pin (Pin 3) on the LM336Z-2.5/LFT1 for minimum temperature drift?
To minimize temperature drift, configure the LM336Z-2.5/LFT1 per Figure 15: connect two silicon signal diodes (e.g., 1N4148) in series between Pin 3 and ground, and adjust the external potentiometer until the output reads 2.490V at 25°C. This nulls the temperature coefficient. The LM336Z-2.5/LFT1's trim range supports ±120 mV adjustment, enabling compensation for both initial tolerance and thermal drift.
What is the maximum reverse current rating for the LM336Z-2.5/LFT1?
The absolute maximum reverse current for the LM336Z-2.5/LFT1 is 15 mA, as stated in the Absolute Maximum Ratings table. However, the recommended operating range is 400 μA to 10 mA per Electrical Characteristics. Sustained operation above 10 mA risks exceeding junction temperature limits (TJ max = 100°C), especially in still-air conditions with its TO-92 package (θJA = 180°C/W).
Is the LM336Z-2.5/LFT1 RoHS compliant and lead-free?
Yes, the LM336Z-2.5/LFT1 is RoHS compliant and lead-free, as confirmed in TI's PACKAGE OPTION ADDENDUM: "RoHS = Yes", "Lead finish = SN" (tin), and "MSL rating = N/A for Pkg Type" due to its TO-92 construction. The part marking "LM336Z2.5" appears on the body, and it ships in tape-and-reel (2000 pcs) with Sn finish per J-STD-020 guidelines.
LM336Z-2.5/LFT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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/LFT1 FAQ
1.How can I place an order for LM336Z-2.5/LFT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336Z-2.5/LFT1 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/LFT1 reliable?
The price and inventory of LM336Z-2.5/LFT1 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/LFT1 is usually 5 days.
3.What payment methods are accepted for LM336Z-2.5/LFT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336Z-2.5/LFT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336Z-2.5/LFT1?
LM336Z-2.5/LFT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336Z-2.5/LFT1 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/LFT1?
For technical support, including LM336Z-2.5/LFT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336Z-2.5/LFT1 requirements.
6.How does Aetrix verify that LM336Z-2.5/LFT1 is sourced from the original manufacturer or authorized distributors?
All LM336Z-2.5/LFT1 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/LFT1 meets industry standards.
7.What is the process for return or replacement of LM336Z-2.5/LFT1?
All LM336Z-2.5/LFT1 units undergo pre-shipment inspection (PSI). If there is an issue with LM336Z-2.5/LFT1, 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/LFT1 part is unused and in its original packaging.
Return procedure for LM336Z-2.5/LFT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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