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Analog Devices Inc. ADR1581ARTZ-R2
- Part No.:
- ADR1581ARTZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADR1581ARTZ-R2.pdf
- Description:
- IC VREF SHUNT 0.12% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,084
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Product details
Overview
ADR1581ARTZ-R2 from Analog Devices is a 2-terminal shunt voltage reference delivering a precise 1.250 V output with ±10 mV initial error, ±100 ppm/°C temperature drift, and 0.5 Ω maximum dynamic output impedance. It operates from 60 μA to 10 mA reverse current and targets precision analog signal chains in space-constrained, battery-powered systems such as portable DMMs and smart industrial transmitters.
For engineers reviewing the ADR1581ARTZ-R2 datasheet, ADR1581ARTZ-R2 pinout, ADR1581ARTZ-R2 application, or ADR1581ARTZ-R2 equivalent, key selection considerations include its SOT-23-3 package compatibility, micropower operation at 60 μA minimum current, low 20 μVrms broadband noise (10 Hz–10 kHz), and guaranteed performance across −40°C to +85°C.
Technical Context
The ADR1581ARTZ-R2 implements a curvature-corrected band gap architecture that sums a forward-biased VBE with a proportional ΔVBE to achieve near-zero temperature coefficient. Its design eliminates reliance on external compensation and ensures stability with any capacitive load up to 1000 pF.
As a 2-terminal shunt device, it functions by sinking variable current to maintain a fixed voltage across its terminals. Its 0.4 Ω typical dynamic output impedance at 120 Hz and 5 μs turn-on settling time to 0.1% support high-speed data converter biasing without external buffering in many low-current applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.250 V nominal; ±10 mV initial error at 25°C defines absolute accuracy for calibration-sensitive circuits. |
| Tempco | ±100 ppm/°C max over −40°C to +85°C; sets worst-case drift-induced error budget in thermal environments. |
| Min Operating Current | 60 μA; enables operation in ultra-low-power modes of 3 V battery systems without dropout or regulation loss. |
| Dynamic Output Impedance | 0.4 Ω typical at 120 Hz; minimizes voltage shift under dynamic load steps, critical for ADC/DAC reference stability. |
| Noise (10 Hz–10 kHz) | 20 μVrms; limits added quantization uncertainty in 12-bit systems operating at full scale. |
| Turn-On Settling Time | 5 μs to 0.1%; supports fast wake-up sequences in power-gated instrumentation without reference stabilization delay. |
| Hysteresis | 80 μV max; constrains repeatability error after thermal cycling between −40°C and +85°C. |
Pinout & Package
ADR1581ARTZ-R2 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with gull-wing leads, 1.90 mm body width, and 0.95 mm lead pitch. Pin 1 is marked with a dot; Pin 3 is NC (no connect) or optionally tied to V– per layout flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Anode / Input terminal | Connects to positive supply rail via series resistor; sinks reverse current to regulate voltage at V– node. |
| V– | Cathode / Output terminal | Provides stable 1.250 V reference potential; must be connected directly to load ground or converter REF(–) input. |
| NC (or V–) | No-connect / optional cathode tie | Unused in standard shunt configuration; may be bonded to V– internally or left floating-no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected band gap core | Enables ±100 ppm/°C tempco without external trimming or compensation networks. |
| Stable with any capacitive load | Eliminates need for output isolation resistors or stability analysis when driving ADC sample-and-hold inputs. |
| Low 60 μA minimum current | Reduces quiescent power to 75 μW at 1.25 V, extending battery life in handheld meters and sensors. |
| 4 kV HBM ESD rating | Permits direct handling and board assembly without special ESD controls in industrial manufacturing lines. |
| 0.1% turn-on settling in 5 μs | Allows synchronous reference activation with ADC conversion start, avoiding timing guard bands. |
Applications
| Portable Precision Meters | Smart Industrial Transmitters |
|---|---|
Use Scenario: Handheld digital multimeters (DMMs) requiring 12-bit resolution and <1 LSB drift over 0–40°C ambient range. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.250 V for SAR ADC front-end scaling and offset calibration. Use Value: ±10 mV initial error and ±100 ppm/°C drift ensure full-scale accuracy remains within 0.8% over operating temperature without firmware correction. |
Use Scenario: 4–20 mA loop-powered transmitters with integrated 16-bit Σ-Δ ADC for pressure/temperature sensing. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and DAC feedback path in isolated analog signal chain. Use Value: Micropower operation at 60 μA enables full functionality within 3.5 mA loop budget while maintaining <0.02% FSR linearity error. |
| PCMCIA Data Acquisition Cards | Automotive Infotainment ADC Biasing |
Use Scenario: Credit-card-sized PCMCIA cards with dual 12-bit ADCs for field data logging in remote monitoring nodes. IC Role / Device Role / Timing Role: Shared reference source for multiple converters, minimizing component count and board area in tight form factors. Use Value: SOT-23-3 footprint and no-load stability allow direct placement adjacent to ADCs, reducing trace inductance and noise coupling. |
Use Scenario: In-vehicle GPS receivers and audio codecs requiring stable reference under 12 V battery variations and engine compartment thermal stress. IC Role / Device Role / Timing Role: Low-drift reference for RF front-end gain control DACs and audio ADCs operating from 3.3 V LDO rails. Use Value: Guaranteed −40°C to +85°C operation and 80 μV hysteresis ensure repeatable performance after cold-start and hot-soak cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR1581BRTZ-R2 | ±1 mV initial error and ±50 ppm/°C tempco vs. ADR1581ARTZ-R2's ±10 mV and ±100 ppm/°C. | Required for 14-bit+ converter systems where initial tolerance dominates total error budget. | Select ADR1581BRTZ-R2 when absolute accuracy at 25°C is prioritized over cost; same SOT-23-3 footprint and pinout. |
| TLVH431IDBZR | 2.5 V nominal output, ±0.5% initial error, 100 ppm/°C tempco, higher 80 μA min current. | Suitable only where 2.5 V reference level is acceptable and system supply allows ≥2.7 V headroom. | Choose TLVH431IDBZR if 1.25 V is not required and existing designs already use adjustable shunt references with external resistor dividers. |
Compared with ADR1581BRTZ-R2, the ADR1581ARTZ-R2 trades tighter initial tolerance and lower tempco for lower unit cost, while TLVH431IDBZR offers different output voltage and higher minimum current-neither is pin-compatible nor drop-in, but both serve overlapping precision analog roles with distinct voltage and accuracy constraints.
Availability
ADR1581ARTZ-R2 is available at Aetrix Electronics and suitable for portable instrumentation, smart sensor transmitters, and PCMCIA-based data acquisition systems requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for ADR1581ARTZ-R2 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADR1581 series was designed specifically for micropower, space-constrained precision reference applications in battery-operated test equipment and industrial sensors-emphasizing low drift, wide current range, and SOT-23 integration.
FAQ
What is the guaranteed initial accuracy of the ADR1581ARTZ-R2 at 25°C?
The ADR1581ARTZ-R2 has a guaranteed initial output voltage error of ±10 mV at 25°C, corresponding to ±0.8% of its 1.250 V nominal output. This specification is verified across production lots and applies to all units shipped in the RT-3 SOT-23-3 package. The ADR1581ARTZ-R2 maintains this tolerance without calibration or trimming, making it suitable for cost-sensitive precision applications where post-manufacture adjustment is impractical.
Does the ADR1581ARTZ-R2 require an external capacitor for stability?
No, the ADR1581ARTZ-R2 is internally compensated and stable with any capacitive load-including zero capacitance-across its full operating current range (60 μA to 10 mA). Unlike many shunt references, it does not oscillate or ring when driving ADC sample-and-hold inputs or PCB traces with inherent capacitance. This eliminates the need for external bypass capacitors in most designs, simplifying layout and reducing BOM count.
Can the ADR1581ARTZ-R2 be used with 3 V supply systems?
Yes, the ADR1581ARTZ-R2 is explicitly optimized for 3 V battery-powered systems. With a minimum operating current of just 60 μA and no minimum voltage headroom requirement beyond its 1.250 V output, it functions reliably from supplies as low as 1.8 V when paired with appropriate series resistance. Its low power consumption (75 μW at 1.25 V) extends runtime in handheld DMMs and portable sensors using alkaline or Li-ion cells.
What is the maximum reverse current rating for the ADR1581ARTZ-R2?
The absolute maximum reverse current rating for the ADR1581ARTZ-R2 is 25 mA, as specified in the Absolute Maximum Ratings table. However, its recommended operating range is 60 μA to 10 mA. Operation above 10 mA increases self-heating and may degrade long-term stability and tempco performance; sustained currents near 25 mA risk exceeding the 0.3 W internal power dissipation limit in the SOT-23-3 package.
How does the ADR1581ARTZ-R2 compare to the ADR1581BRTZ-R2 in terms of temperature drift?
The ADR1581ARTZ-R2 has a maximum temperature coefficient of ±100 ppm/°C over −40°C to +85°C, whereas the ADR1581BRTZ-R2 is rated at ±50 ppm/°C. This means the ADR1581ARTZ-R2 contributes up to twice the voltage drift error over the same temperature span-e.g., ±8.125 mV vs. ±4.063 mV for a 65°C span. Designers selecting ADR1581ARTZ-R2 accept this trade-off for lower cost in applications where initial tolerance dominates total error.
ADR1581ARTZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 4.5µVp-p
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ADR1581ARTZ-R2 FAQ
1.How can I place an order for ADR1581ARTZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR1581ARTZ-R2 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 ADR1581ARTZ-R2 reliable?
The price and inventory of ADR1581ARTZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR1581ARTZ-R2 is usually 5 days.
3.What payment methods are accepted for ADR1581ARTZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR1581ARTZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR1581ARTZ-R2?
ADR1581ARTZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR1581ARTZ-R2 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 ADR1581ARTZ-R2?
For technical support, including ADR1581ARTZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR1581ARTZ-R2 requirements.
6.How does Aetrix verify that ADR1581ARTZ-R2 is sourced from the original manufacturer or authorized distributors?
All ADR1581ARTZ-R2 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 ADR1581ARTZ-R2 meets industry standards.
7.What is the process for return or replacement of ADR1581ARTZ-R2?
All ADR1581ARTZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with ADR1581ARTZ-R2, 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 ADR1581ARTZ-R2 part is unused and in its original packaging.
Return procedure for ADR1581ARTZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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