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Texas Instruments LM336Z-2.5/LFT7
- Part No.:
- LM336Z-2.5/LFT7
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM336Z-2.5/LFT7.pdf
- Description:
- IC VREF SHUNT 4% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,995
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Product details
Overview
LM336Z-2.5/LFT7 from Texas Instruments is a precision 2.5V shunt voltage reference 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/LFT7 datasheet, LM336Z-2.5/LFT7 pinout, LM336Z-2.5/LFT7 application, or LM336Z-2.5/LFT7 equivalent, key selection criteria include temperature stability (≤6 mV over 0°C to 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/LFT7 operates as a monolithic 2.5V zener-based shunt regulator with third-terminal voltage trimming capability. Its architecture enables precise adjustment of both output voltage and temperature coefficient without cross-coupling effects.
It features a low-temperature-coefficient design optimized for commercial-temperature applications, with specified temperature stability of 1.8–6 mV over 0°C to +70°C when adjusted to 2.490V. The device exhibits fast turn-on behavior and supports bidirectional polarity use-either as a positive or negative reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.440–2.540 V at 1 mA (±1% initial tolerance ensures predictable system-level accuracy without calibration) |
| Operating Current Range | 400 μA to 10 mA (enables low-power sensing and high-current buffering in same design) |
| Dynamic Impedance | 0.2 Ω typical at 1 mA (minimizes load-induced voltage variation in precision feedback paths) |
| Temperature Stability | ≤6 mV over 0°C to +70°C (guarantees ≤0.24% drift for stable ADC reference or comparator threshold) |
| Initial Tolerance | ±1% (reduces need for post-assembly trimming in cost-sensitive instrumentation) |
| Package | TO-92 (LP) - 3-pin through-hole, compatible with legacy board layouts and manual assembly) |
Pinout & Package
LM336Z-2.5/LFT7 uses the standard TO-92 plastic package (package drawing LP), with 3 leads arranged in straight or formed configuration per JEDEC TO-226. Thermal resistance θJA is 180°C/W (0.4″ leads).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink terminal | Connects to ground or negative rail; sets reference polarity when used as negative reference |
| Cathode (Pin 2) | Output/reference node | Provides stable 2.5V output; must be decoupled with ≥1 μF capacitor for noise immunity |
| Adjust (Pin 3) | Voltage/TC trim terminal | Enables fine-tuning of reference voltage and temperature coefficient using external potentiometer or diode network |
Key Features
| Feature | Design Value |
|---|---|
| Trim-capable reference voltage | Adjustment range ±70 mV typical via Pin 3 - enables compensation for initial tolerance and buffer errors |
| Low dynamic impedance | 0.2 Ω typical - maintains regulation under varying load currents in feedback loops |
| Wide operating current | 400 μA to 10 mA - supports ultra-low-power sensor interfaces and higher-drive analog stages |
| Specified temperature stability | 1.8–6 mV over 0°C to +70°C - meets commercial-grade instrumentation requirements without external compensation |
| Easily minimized temperature drift | Adjustable to 2.490V with series diodes (e.g., 1N4148) - reduces TC to near-zero without custom circuitry |
Applications
| Digital Voltmeter Reference | Op-Amp Precision Biasing |
|---|---|
Use Scenario: Used as primary reference for 3½-digit handheld DVMs powered from single 9V battery. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V input to ADC's internal reference buffer. Use Value: ±1% initial tolerance and ≤6 mV temp drift ensure <0.5% full-scale error across operating temperature without recalibration. | Use Scenario: Sets precise common-mode voltage for rail-to-rail input op-amps in signal conditioning front-ends. IC Role / Device Role / Timing Role: Active bias node generating fixed 2.5V mid-supply reference for dual-supply op-amp configurations. Use Value: 0.2Ω dynamic impedance prevents loading-induced offset shift during fast transient inputs. |
| 5V-Supply Derived Reference | Low-Cost Crowbar Circuit |
Use Scenario: Generates accurate 2.5V reference directly from unregulated 5V logic supply in embedded microcontroller systems. IC Role / Device Role / Timing Role: Shunt regulator clamping node that sinks excess current to maintain regulated voltage. Use Value: Wide 400 μA–10 mA operating range accommodates varying load currents while maintaining regulation. | Use Scenario: Triggers SCR-based overvoltage protection when 5V rail exceeds safe threshold in power supply designs. IC Role / Device Role / Timing Role: Precision voltage threshold detector enabling crowbar activation at exactly 2.5V × gain factor. Use Value: Trim capability allows setting exact trip point (e.g., 5.00V via 2× resistor divider), improving system safety margin. |
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; requires external resistors for 2.5V setting; SO-8 package | Higher minimum cathode current (1 mA); no built-in trim terminal; better long-term stability (±50 ppm/1000 hrs) | Preferred for surface-mount designs requiring tighter long-term drift control, but lacks direct pin-compatible trim function |
| LM385BZ-2.5/LFT7 | 2.5V micropower shunt reference; 10 μA to 20 mA operating range; ±1.5% tolerance; TO-92 package | Lower quiescent current; higher dynamic impedance (10 Ω); wider temp range (−40°C to +85°C) | Best for battery-powered systems where sub-100 μA operation is critical, though less suitable for high-accuracy feedback |
Compared with TL431ACDBVR and LM385BZ-2.5/LFT7, the LM336Z-2.5/LFT7 uniquely combines factory-trimmable voltage/TC, TO-92 through-hole compatibility, and 0.2Ω impedance - making it optimal for cost-sensitive, medium-accuracy commercial instrumentation where manual calibration and layout flexibility are priorities.
Availability
LM336Z-2.5/LFT7 is available at Aetrix Electronics and suitable for digital multimeters, industrial sensor signal conditioning, op-amp bias networks, and 5V-derived reference circuits requiring stable component supply across production volumes.
Supply support for LM336Z-2.5/LFT7 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 and embedded processing solutions, with leadership in precision analog ICs and reference technologies.
The LM336 family was designed for commercial-temperature, cost-effective precision voltage referencing - targeting applications where ±1% accuracy, trim capability, and TO-92 compatibility outweigh ultra-low power or extended temperature needs.
FAQ
What is the operating temperature range for LM336Z-2.5/LFT7?
The LM336Z-2.5/LFT7 is rated for operation from 0°C to +70°C. This commercial-grade temperature range is explicitly defined in TI's SNVS749F datasheet and confirmed in the Package Option Addendum. Operation outside this range may result in unguaranteed performance or parametric shift, and thermal derating is required above 70°C per junction-to-ambient thermal resistance (θJA = 180°C/W).
Can LM336Z-2.5/LFT7 be used as a negative voltage reference?
Yes, the LM336Z-2.5/LFT7 can be used as a negative voltage reference by reversing its connection: connect the cathode (Pin 2) to ground and the anode (Pin 1) to the negative rail. As a shunt regulator, it regulates voltage across its terminals regardless of polarity. The datasheet explicitly states it "can be used as either a positive or negative voltage reference," and Figure 23 (Bipolar Output Reference) demonstrates this configuration.
Does LM336Z-2.5/LFT7 require external components to function as a basic 2.5V reference?
Yes - LM336Z-2.5/LFT7 requires at minimum a current-setting resistor between the supply and cathode (Pin 2), plus a bypass capacitor (≥1 μF) from cathode to anode. Unlike series references, it is a shunt device and must sink its operating current. The resistor value is calculated based on supply voltage and desired operating current (e.g., 4.7 kΩ for ~1 mA from 5V). Pin 3 (Adjust) may be left open or grounded depending on whether trimming is needed.
What is the purpose of the Adjust pin (Pin 3) on LM336Z-2.5/LFT7?
The Adjust pin (Pin 3) on LM336Z-2.5/LFT7 enables independent trimming of both reference voltage and temperature coefficient. When connected to a potentiometer or diode network (e.g., two 1N4148s), it allows fine-tuning to 2.490V - minimizing temperature drift. This feature is documented in Figures 14 and 15 of the SNVS749F datasheet and is unique to the LM136/LM236/LM336 family among TI's 2.5V shunt references.
Is LM336Z-2.5/LFT7 RoHS compliant and lead-free?
Yes, LM336Z-2.5/LFT7 is RoHS compliant and lead-free. Per TI's Package Option Addendum, the part number suffix "/LFT7" denotes tape-and-reel packaging with Sn (tin) lead finish and RoHS "Yes" status. The marking "LM336 Z2.5" and MSL rating "N/A for Pkg Type" further confirm compliance for TO-92 devices, which are exempt from moisture sensitivity level classification.
LM336Z-2.5/LFT7 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/LFT7 FAQ
1.How can I place an order for LM336Z-2.5/LFT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336Z-2.5/LFT7 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/LFT7 reliable?
The price and inventory of LM336Z-2.5/LFT7 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/LFT7 is usually 5 days.
3.What payment methods are accepted for LM336Z-2.5/LFT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336Z-2.5/LFT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336Z-2.5/LFT7?
LM336Z-2.5/LFT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336Z-2.5/LFT7 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/LFT7?
For technical support, including LM336Z-2.5/LFT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336Z-2.5/LFT7 requirements.
6.How does Aetrix verify that LM336Z-2.5/LFT7 is sourced from the original manufacturer or authorized distributors?
All LM336Z-2.5/LFT7 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/LFT7 meets industry standards.
7.What is the process for return or replacement of LM336Z-2.5/LFT7?
All LM336Z-2.5/LFT7 units undergo pre-shipment inspection (PSI). If there is an issue with LM336Z-2.5/LFT7, 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/LFT7 part is unused and in its original packaging.
Return procedure for LM336Z-2.5/LFT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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