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Texas Instruments LM336BZ-2.5/LFT3
- Part No.:
- LM336BZ-2.5/LFT3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM336BZ-2.5/LFT3.pdf
- Description:
- IC VREF SHUNT 2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
LM336BZ-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-supply-derived reference circuits.
For engineers reviewing the LM336BZ-2.5/LFT3 datasheet, LM336BZ-2.5/LFT3 pinout, LM336BZ-2.5/LFT3 application, or LM336BZ-2.5/LFT3 equivalent, key selection criteria include temperature coefficient (≤6 mV over 0°C–70°C), trimmable reference voltage, low dynamic impedance, and compatibility with shunt-regulator topologies requiring minimal external components.
Technical Context
The LM336BZ-2.5/LFT3 operates as a monolithic 2.5V zener-based shunt regulator with third-terminal voltage trimming capability. Its internal architecture enables independent adjustment of reference voltage and temperature coefficient using external resistors or diodes.
It functions across 400 μA–10 mA reverse current without requiring series pass transistors or feedback loops. Unlike bandgap references, it delivers stable output via low-impedance zener conduction, making it suitable for low-power, cost-sensitive analog monitoring and calibration circuits where precision and simplicity are prioritized over ultra-low drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V (typical, adjustable ±70 mV); provides stable 2.5V reference directly from 5V logic rails. |
| Initial Tolerance | ±1% (2.440 V to 2.540 V at 25°C); ensures accurate calibration without post-manufacture trimming in many applications. |
| Dynamic Impedance | 0.2 Ω (typical at 1 mA); minimizes output voltage variation under load changes, critical for high-accuracy measurement front-ends. |
| Operating Current Range | 400 μA to 10 mA; supports low-power sensor interfaces and high-current reference buffering without external amplification. |
| Temperature Stability | ≤6 mV over 0°C to +70°C; enables stable performance in commercial-grade industrial and test equipment without active compensation. |
| Package | TO-92 (LP), 3-pin plastic; compatible with through-hole assembly and manual prototyping, with thermal resistance θJA = 180°C/W (0.4″ leads). |
Pinout & Package
LM336BZ-2.5/LFT3 uses a standard TO-92 plastic package (package code LP) with 3 leads. The device is a 3-terminal shunt reference: anode, cathode, and adjust terminal - enabling precise voltage and temperature coefficient tuning.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for reference current; connects to system ground in standard shunt configurations. |
| Cathode (Pin 2) | Output reference node | Delivers regulated 2.5V when reverse-biased; connects to load or op-amp input for sensing. |
| Adjust (Pin 3) | Trim control terminal | Allows external resistor or diode network to fine-tune reference voltage and minimize temperature drift (e.g., Figure 14–15 in datasheet). |
Key Features
| Feature | Design Value |
|---|---|
| Low temperature coefficient | Stable 2.5V output with ≤6 mV drift over 0°C–70°C, enabling reliable calibration in uncontrolled ambient environments. |
| Easily trimmed reference | Third-terminal adjust pin allows ±70 mV voltage trim and independent temperature coefficient optimization using simple external components. |
| Wide operating current range | Functional from 400 μA (ultra-low-power sensor biasing) up to 10 mA (driving op-amp inputs or small buffers) without performance degradation. |
| Low dynamic impedance | 0.2 Ω typical impedance ensures <1 mV output shift per 1 mA load change - essential for high-resolution ADC reference and precision comparator circuits. |
| Shunt topology flexibility | Operates as positive or negative reference; supports both high-side and low-side sensing configurations without polarity constraints. |
Applications
| Digital Voltmeter Reference | Op-Amp Biasing Circuit |
|---|---|
Use Scenario: Providing stable 2.5V reference for 12-bit ADC in handheld DVMs powered from 9V batteries. IC Role / Device Role / Timing Role: Shunt voltage reference supplying excitation and scaling reference for successive-approximation ADC conversion. Use Value: ±1% initial tolerance and ≤6 mV temperature drift ensure <0.1% full-scale error across operating range without recalibration. | Use Scenario: Setting precise DC bias point for rail-to-rail input op-amps in signal conditioning stages. IC Role / Device Role / Timing Role: Low-impedance 2.5V reference source for virtual ground generation and common-mode level shifting. Use Value: 0.2Ω dynamic impedance prevents bias shift under varying op-amp input current, maintaining amplifier linearity and offset stability. |
| 5V-Supply-Derived Reference | Temperature-Compensated Calibration Source |
Use Scenario: Generating accurate 2.5V reference directly from standard 5V logic supply in microcontroller-based data loggers. IC Role / Device Role / Timing Role: Shunt regulator that sinks excess current to maintain fixed 2.5V node, eliminating need for LDO or divider networks. Use Value: Wide 400 μA–10 mA operating range accommodates variable load currents while maintaining regulation - reducing BOM count and layout area. | Use Scenario: High-stability reference for factory calibration fixtures used in production testing of analog sensors. IC Role / Device Role / Timing Role: Trimmed 2.490V reference with minimized temperature coefficient (Figure 15), using matched diodes for thermal tracking. Use Value: Adjustable trim terminal enables post-calibration drift correction, achieving <2 mV total drift over 0°C–70°C in optimized setups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM336Z-2.5/LFT3 | Same TO-92 package and 0°C–70°C rating, but ±2% initial tolerance (vs. ±1% for LM336BZ-2.5/LFT3) and higher temp drift (≤9 mV). | Suitable for cost-sensitive applications where tighter tolerance is not required, such as non-critical power monitoring. | Select LM336Z-2.5/LFT3 only if ±2% tolerance and relaxed drift specs meet system accuracy requirements. |
| TL431ACDBVR | Adjustable 2.495V shunt reference in SOT-23; requires two external resistors for 2.5V setting; 0.2% initial tolerance, lower temp drift (±50 ppm/°C), but no dedicated trim terminal. | Better for space-constrained PCBs and systems needing higher accuracy, though lacks direct trim capability for drift minimization. | Choose TL431ACDBVR when board area is limited and higher precision is needed, accepting trade-off of no dedicated temperature-coefficient trim pin. |
Compared with LM336Z-2.5/LFT3, the LM336BZ-2.5/LFT3 offers tighter initial tolerance and lower temperature drift - critical for calibration-grade references. Versus TL431ACDBVR, it provides simpler trim architecture for drift optimization but occupies larger TO-92 footprint and has looser absolute accuracy.
Availability
LM336BZ-2.5/LFT3 is available at Aetrix Electronics and suitable for digital instrumentation, op-amp biasing, 5V-derived reference generation, and factory calibration systems requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM336BZ-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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, scalability, and broad technical support infrastructure.
The LM336 family was designed specifically for precision shunt reference applications in commercial-grade instrumentation, test equipment, and industrial control systems where simplicity, trimmability, and stable 2.5V operation are essential.
FAQ
What is the operating temperature range for LM336BZ-2.5/LFT3?
The LM336BZ-2.5/LFT3 is specified for operation from 0°C to +70°C. This commercial-grade range aligns with standard industrial and consumer electronics environments. Junction temperature must not exceed 100°C under continuous operation, and thermal resistance (θJA) is 180°C/W with 0.4″ leads - requiring appropriate PCB copper area for power dissipation at higher currents.
Can LM336BZ-2.5/LFT3 be used as a negative voltage reference?
Yes, the LM336BZ-2.5/LFT3 can function as a negative voltage reference by reversing its connection: connect the cathode to system ground and the anode to a negative supply rail. In this configuration, it regulates −2.5V relative to ground. The adjust pin remains functional for trimming, and all electrical specifications (e.g., dynamic impedance, temperature stability) apply identically in inverted orientation.
How is the reference voltage trimmed on LM336BZ-2.5/LFT3?
The LM336BZ-2.5/LFT3 uses Pin 3 (Adjust) to enable voltage trimming. A 10 kΩ potentiometer between Anode (Pin 1) and Adjust (Pin 3) allows ±70 mV adjustment of the reference voltage (Figure 14). For minimum temperature coefficient, two silicon signal diodes (e.g., 1N4148) are added in series with the potentiometer (Figure 15), and the device is adjusted to exactly 2.490 V to nullify drift.
What is the maximum reverse current rating for LM336BZ-2.5/LFT3?
The absolute maximum reverse current for LM336BZ-2.5/LFT3 is 15 mA. However, the recommended operating range is 400 μA to 10 mA, where all electrical specifications (including dynamic impedance and temperature stability) are guaranteed. Exceeding 10 mA may increase self-heating and degrade long-term stability, while operation below 400 μA risks loss of regulation and increased noise.
Does LM336BZ-2.5/LFT3 require external capacitors for stability?
No, the LM336BZ-2.5/LFT3 does not require external capacitors for basic regulation stability. Its internal design ensures stable operation across its full 400 μA–10 mA current range without oscillation. However, a 1 μF ceramic capacitor placed between Cathode (Pin 2) and Anode (Pin 1) is recommended in noisy environments to suppress high-frequency ripple and improve transient response - particularly when driving capacitive loads or sharing supply rails with switching circuits.
LM336BZ-2.5/LFT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.49V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±2%
- 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
LM336BZ-2.5/LFT3 FAQ
1.How can I place an order for LM336BZ-2.5/LFT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336BZ-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 LM336BZ-2.5/LFT3 reliable?
The price and inventory of LM336BZ-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 LM336BZ-2.5/LFT3 is usually 5 days.
3.What payment methods are accepted for LM336BZ-2.5/LFT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336BZ-2.5/LFT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336BZ-2.5/LFT3?
LM336BZ-2.5/LFT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336BZ-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 LM336BZ-2.5/LFT3?
For technical support, including LM336BZ-2.5/LFT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336BZ-2.5/LFT3 requirements.
6.How does Aetrix verify that LM336BZ-2.5/LFT3 is sourced from the original manufacturer or authorized distributors?
All LM336BZ-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 LM336BZ-2.5/LFT3 meets industry standards.
7.What is the process for return or replacement of LM336BZ-2.5/LFT3?
All LM336BZ-2.5/LFT3 units undergo pre-shipment inspection (PSI). If there is an issue with LM336BZ-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 LM336BZ-2.5/LFT3 part is unused and in its original packaging.
Return procedure for LM336BZ-2.5/LFT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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