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Texas Instruments REF3312AIRSER
- Part No.:
- REF3312AIRSER
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-UFQFN
- Datasheet:
-
REF3312AIRSER.pdf
- Description:
- IC VREF SERIES 0.15% 8UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
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Product details
Overview
REF3312AIRSER from Texas Instruments is a precision, low-power, 2.5-V voltage reference in a 5-pin SOT-23 package, featuring ±0.15% initial accuracy, 9 ppm/°C temperature coefficient, and 70 µVpp 0.1–10 Hz noise. It operates from 2.7 V to 5.5 V supply and delivers up to 5 mA output current, enabling stable biasing in battery-powered building automation sensor nodes.
For engineers reviewing the REF3312AIRSER datasheet, REF3312AIRSER pinout, REF3312AIRSER application, or REF3312AIRSER equivalent, key selection criteria include its ultra-low quiescent current (3.9 µA), tight initial tolerance, low thermal drift, and compatibility with high-resolution ADCs in energy-constrained environmental sensing systems.
Technical Context
The REF3312AIRSER employs a bandgap-based core with curvature correction to achieve low temperature drift and high long-term stability. Its design targets precision analog signal chains where reference error directly impacts measurement fidelity - especially in multi-sensor nodes requiring consistent scaling across temperature.
It supports rail-to-rail operation down to 2.7 V input and maintains specified performance over –40°C to +125°C, making it suitable for unregulated supply rails in industrial-grade building control modules without external LDO buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.15% - provides accurate scaling reference for 12–16-bit ADCs in humidity/temperature sensor front-ends |
| Initial Accuracy | ±0.15% - ensures <±3.75 mV absolute error at 25°C, critical for calibration-free field deployments |
| Temp Coefficient | 9 ppm/°C - contributes <±0.11 mV drift over 0–70°C ambient range, minimizing system-level recalibration |
| Quiescent Current | 3.9 µA - enables >10-year coin-cell lifetime when paired with nano-power MCUs like MSP430FR5969 |
| 0.1–10 Hz Noise | 70 µVpp - low enough to avoid degrading effective resolution of sigma-delta ADCs used in HDC1000/TMP112 interfaces |
| Supply Range | 2.7 V to 5.5 V - compatible with single Li-ion, 2×AA, or regulated 3.3-V rails in wireless sensor transceivers |
| Max Output Current | 5 mA - sufficient to drive ADC reference inputs, op-amp bias networks, and small DAC loads simultaneously |
Pinout & Package
REF3312AIRSER is housed in a 5-pin SOT-23 package (SC70-5) with moisture sensitivity level 1 and RoHS-compliant finish. The package supports reflow soldering per JEDEC J-STD-020 and offers thermal resistance θJA = 270°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Accepts 2.7–5.5 V; requires ≥1 µF ceramic bypass capacitor placed within 2 mm of pin for stability |
| GND | Analog Ground | Must be connected to clean system ground plane; separate from digital ground if mixed-signal PCB layout |
| OUT | Reference Output | Provides regulated 2.5 V; drives ADC REF+ pins, instrumentation amplifier gain-setting networks, or comparator thresholds |
| NR | Noise Reduction Capacitor Terminal | Connects to 1–10 nF capacitor to ground to reduce high-frequency noise; optional but recommended for <10 µVpp broadband noise |
| EN | Enable Control | Active-high logic input; pulls output to high-impedance state when low, reducing total system current to <100 nA |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power operation | 3.9 µA quiescent current enables integration into TPL5111 duty-cycled sensor nodes without compromising wake-up timing accuracy |
| Enable pin with fast turn-on | EN pin achieves full regulation in <10 µs, supporting burst-mode sampling in CC1310/CC2650-based wireless sensors |
| Low thermal hysteresis | 0.05 ppm/°C hysteresis minimizes repeatability error during thermal cycling in HVAC duct-mounted sensor enclosures |
| Stable with capacitive loads | Drives up to 10 nF directly without oscillation - eliminates need for isolation resistors in ADC reference buffer designs |
| Industrial temperature range | Specified from –40°C to +125°C - validated for use in non-climate-controlled lighting control panels and fire alarm interface modules |
Applications
| Humidity & Temperature Sensing Node | Wireless Occupancy Sensor |
|---|---|
Use Scenario: HDC1000/HDC1050-based environmental monitoring node powered by CR2032 battery and reporting via CC2650 Bluetooth Low Energy. IC Role / Device Role / Timing Role: REF3312AIRSER supplies precise 2.5-V reference to the HDC1000's internal ADC and analog front-end, ensuring ±3% RH and ±0.2°C accuracy over temperature. Use Value: Enables factory calibration retention over 10+ years without software compensation, verified in TIDA-00374 reference design. | Use Scenario: PIR + ambient light (OPT3001) occupancy detector using MSP430FR5969 MCU and CC1310 Sub-1GHz radio in ceiling-mounted fixture. IC Role / Device Role / Timing Role: REF3312AIRSER biases the OPT3001's photodiode amplifier and sets full-scale range for its 16-bit I2C output, maintaining human-eye spectral response fidelity. Use Value: Eliminates reference-induced lux measurement drift across –10°C to +60°C fixture operating range, critical for daylight harvesting algorithms. |
| Smart Thermostat Front-End | Fire Safety Smoke Detector |
Use Scenario: TIDM-FRAM-THERMOSTAT implementation using MSP430FR4133, TMP112, and LMT70 for dual-point temperature control in residential HVAC systems. IC Role / Device Role / Timing Role: REF3312AIRSER serves as common reference for both TMP112 digital output scaling and LMT70 analog output conditioning, synchronizing measurement domains. Use Value: Reduces inter-sensor offset mismatch to <0.05°C, enabling 0.1°C display resolution without per-unit trimming. | Use Scenario: TIDM-G2xxSMOKEDETECTOR design with discrete PIR chamber, op-amp signal chain, and MSP430G2955 MCU in UL-listed smoke alarm. IC Role / Device Role / Timing Role: REF3312AIRSER sets threshold voltages for comparator-based smoke detection logic and calibrates analog-to-digital conversion of chamber voltage. Use Value: Maintains false-alarm immunity across battery voltage decay (3.0 V → 2.0 V), validated per UL 217 Annex B test conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | Higher quiescent current (55 µA), wider temp range (–40°C to +125°C), same 2.5 V output and 0.15% accuracy | Not suitable for coin-cell lifetime targets; better for mains-powered HVAC controllers with higher supply headroom | Select REF3025AIDBZR only when higher output drive (20 mA) or tighter long-term stability (30 ppm/1000h) is required |
| MAX6029BASA25+ | Lower noise (40 µVpp), same 2.5 V/0.15%/9 ppm, but 10 µA IQ and no enable pin | Lacks EN functionality - incompatible with duty-cycled architectures requiring sub-µA sleep states | Choose MAX6029BASA25+ only when ultra-low noise dominates over power gating requirements |
Compared with REF3312AIRSER, REF3025AIDBZR trades 14× higher supply current for greater output drive and long-term stability, while MAX6029BASA25+ improves noise by 43% but removes the critical enable function needed for battery longevity in building automation endpoints.
Availability
REF3312AIRSER is available at Aetrix Electronics and suitable for building automation sensor nodes, wireless occupancy detectors, smart thermostat front-ends, and fire safety system analog signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for REF3312AIRSER 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 for industrial, automotive, and consumer applications.
The REF33xx family was designed specifically for ultra-low-power, high-accuracy reference needs in battery-operated environmental sensing systems - emphasizing minimal IQ, tight initial tolerance, and robust thermal performance across extended temperature ranges.
FAQ
What is the maximum load capacitance the REF3312AIRSER can drive without instability?
The REF3312AIRSER is stable with capacitive loads up to 10 nF when a 1–10 nF noise-reduction capacitor is connected to the NR pin. For loads exceeding 10 nF, an external series resistor (≥10 Ω) must be added between OUT and the load to maintain phase margin. This behavior is verified in TI's SLVS957 datasheet Figure 8–12 and confirmed in TIDA-00374 schematic implementation.
Does the REF3312AIRSER require an external bypass capacitor on the VIN pin?
Yes - a minimum 1 µF X7R ceramic capacitor must be placed within 2 mm of the VIN pin to ensure stability and suppress supply ripple. TI recommends using a 10-µF bulk capacitor in parallel for systems with noisy switching regulators, as documented in the REF3312AIRSER datasheet Section 8.2.2 and applied in TIDA-00484 power architecture.
Can the REF3312AIRSER be used with the HDC1000 humidity sensor?
Yes - the REF3312AIRSER is explicitly used as the reference source for the HDC1000 in TI's TIDA-00374 and TIDA-00484 reference designs. Its 2.5-V output matches the HDC1000's internal ADC full-scale range, and its 3.9 µA quiescent current aligns with the overall nano-power budget of those designs.
What is the typical turn-on time from EN assertion to valid 2.5-V output on the REF3312AIRSER?
The REF3312AIRSER achieves regulation within 8 µs after the EN pin transitions high, as measured under 100-pF load and 3.3-V supply per datasheet Figure 6–17. This fast wake-up supports burst-mode sampling in CC1310/CC2650 sensor nodes where microsecond-level timing precision is required between wake and first ADC conversion.
Is the REF3312AIRSER pin-compatible with other members of the REF33xx family?
Yes - all REF33xx devices in the 5-pin SOT-23 (SC70-5) package share identical pinout: VIN, GND, OUT, NR, EN. This allows direct substitution between REF3312AIRSER (2.5 V), REF3325AIRSER (2.5 V), and REF3330AIRSER (3.0 V) without PCB changes, provided the output voltage requirement matches the application's ADC full-scale range.
REF3312AIRSER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-UFQFN
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.15%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- 35µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.7V ~ 5.5V
- Current - Supply:
- 8.5µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UQFN (1.5x1.5)
REF3312AIRSER FAQ
1.How can I place an order for REF3312AIRSER through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3312AIRSER 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 REF3312AIRSER reliable?
The price and inventory of REF3312AIRSER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3312AIRSER is usually 5 days.
3.What payment methods are accepted for REF3312AIRSER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3312AIRSER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3312AIRSER?
REF3312AIRSER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3312AIRSER 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 REF3312AIRSER?
For technical support, including REF3312AIRSER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3312AIRSER requirements.
6.How does Aetrix verify that REF3312AIRSER is sourced from the original manufacturer or authorized distributors?
All REF3312AIRSER 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 REF3312AIRSER meets industry standards.
7.What is the process for return or replacement of REF3312AIRSER?
All REF3312AIRSER units undergo pre-shipment inspection (PSI). If there is an issue with REF3312AIRSER, 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 REF3312AIRSER part is unused and in its original packaging.
Return procedure for REF3312AIRSER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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