My Inquiry
My Account
Analog Devices Inc. ADR121BUJZ-REEL7
- Part No.:
- ADR121BUJZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
ADR121BUJZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.12% TSOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,405
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADR121BUJZ-REEL7 from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 2.5 V output with ±0.12% initial accuracy and 9 ppm/°C max temperature coefficient over −40°C to +125°C. It operates from 2.8 V to 18 V input, sustains 5 mA sourcing/2 mA sinking, and consumes only 85 μA typical quiescent current - ideal for high-accuracy battery-powered instrumentation.
For engineers reviewing the ADR121BUJZ-REEL7 datasheet, ADR121BUJZ-REEL7 pinout, ADR121BUJZ-REEL7 application, or ADR121BUJZ-REEL7 equivalent, key selection criteria include dropout voltage (300 mV), long-term stability (150 ppm/1000 hrs), 0.1 Hz–10 Hz noise (18 μV p-p), load regulation (≤300 ppm/mA), and TSOT-6 package compatibility in space-constrained industrial and medical designs.
Technical Context
The ADR121BUJZ-REEL7 implements a patented curvature-corrected band gap architecture to minimize nonlinearities in output voltage vs. temperature. Its series-mode topology enables sink and source capability while maintaining low thermal drift.
It achieves stable regulation with only 300 mV headroom above 2.5 V output and supports capacitive loads down to 0.1 μF for stability. The device features internal protection against line/load transients and exhibits −90 dB PSRR at 60 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal; B-grade tolerance ±0.12% ensures ≤3 mV absolute error at 25°C for calibration-grade systems. |
| Temp Coefficient | Max 9 ppm/°C over −40°C to +125°C; contributes ≤1.13 mV total drift across full range - critical for automotive sensor front-ends. |
| Dropout Voltage | 300 mV at 0 mA load; enables operation from 2.8 V supply - essential for single-cell Li-ion or 3.3 V rail-referenced ADCs. |
| Quiescent Current | 85 μA typical; draws <100 μA across temperature - extends battery life in portable ECG monitors beyond 5 years. |
| Output Noise | 18 μV p-p (0.1 Hz–10 Hz); supports 16-bit+ data acquisition without external filtering in precision DAQ systems. |
| Load Regulation | ≤300 ppm/mA sourcing; maintains <0.75 mV shift from 0 to 5 mA - suitable for driving SAR ADC reference inputs directly. |
| Long-Term Stability | 150 ppm/1000 hrs at 25°C; guarantees <0.375 mV drift over 1 year - meets requirements for unattended field instrumentation. |
Pinout & Package
ADR121BUJZ-REEL7 is housed in a 6-lead TSOT (UJ-6) package measuring 2.90 mm × 1.60 mm × 0.95 mm, optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No Connect | Must be left floating; no internal connection - avoids unintended parasitic coupling in RF-sensitive layouts. |
| 2 GND | Ground Reference | Primary return path for reference current and load current; requires low-impedance connection to minimize ground bounce. |
| 3 VIN | Input Supply | Accepts 2.8 V to 18 V; minimum 300 mV headroom required for regulation - dictates lowest usable supply rail. |
| 4 VOUT | Reference Output | Stable 2.5 V source; requires 0.1 μF ceramic capacitor to ground for stability and transient response. |
| 5 NC | No Connect | Must be left floating; electrically isolated - prevents solder bridging risks during automated assembly. |
| 6 NC | No Connect | Must be left floating; no internal bond wire - eliminates need for routing or thermal relief on this pad. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Band Gap | Reduces temperature-induced nonlinearity to <9 ppm/°C - enables single-point calibration across industrial temperature range. |
| Sink/Source Capability | Supports ±2 mA to ±5 mA load current - allows direct interface with op-amp bias networks or ADC reference buffers without external transistors. |
| Low 0.1 Hz–10 Hz Noise | 18 μV p-p output noise - preserves SNR in high-resolution sigma-delta ADCs used in weigh scales and strain gauge interfaces. |
| TSOT-6 Package | 0.95 mm profile with 0.5 mm pitch - fits beneath 1.0 mm board height constraints in handheld medical devices. |
| Extended Temperature Range | −40°C to +125°C operation - qualified for under-hood automotive sensors and industrial motor control feedback circuits. |
Applications
| Battery-Powered Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 20-bit ADC conversion across varying battery voltage (3.0–4.2 V). IC Role / Device Role / Timing Role: Precision voltage reference providing excitation and scaling for analog front-end and ADC reference input. Use Value: 300 mV dropout enables operation down to 2.8 V supply; ±0.12% initial accuracy eliminates factory recalibration. | Use Scenario: Portable ECG monitor powered by coin cell, needing ultra-low-power 2.5 V reference for analog signal conditioning. IC Role / Device Role / Timing Role: Micropower reference supplying bias to instrumentation amplifiers and ADC reference rails. Use Value: 85 μA quiescent current extends battery life >5 years; 18 μV p-p noise ensures clean biopotential measurement. |
| Data Acquisition Systems | Automotive Sensor Interfaces |
Use Scenario: Industrial DAQ module digitizing thermocouple and RTD signals with 16-bit resolution over −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary reference for programmable gain instrumentation amplifier and successive-approximation ADC. Use Value: 9 ppm/°C tempco limits gain error to <0.01% across operating range; 150 ppm/1000 hrs stability ensures field calibration intervals ≥2 years. | Use Scenario: Engine control unit sensing exhaust gas oxygen with wideband lambda sensor requiring precise 2.5 V bias. IC Role / Device Role / Timing Role: High-stability reference for sensor excitation and ADC reference in harsh under-hood environment. Use Value: Qualified to −40°C to +125°C; 300 ppm/mA load regulation accommodates sensor heater current transients without reference droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR121AUJZ-REEL7 | Same 2.5 V output and TSOT-6 package, but A-grade: ±0.24% initial accuracy and 25 ppm/°C max tempco. | Lower accuracy and higher drift limit use in cost-sensitive consumer DAQ where 14-bit performance suffices. | Select when budget constraints outweigh precision requirements and long-term drift is less critical. |
| REF192GS | 2.5 V reference in SOIC-8; ±0.1% initial accuracy, 10 ppm/°C tempco, 125 μA IQ, 400 mV dropout. | Larger footprint and higher power prevent use in ultra-compact portable designs; better suited for board-level test equipment. | Choose when SOIC-8 layout compatibility exists and slightly higher dropout is acceptable for legacy designs. |
Compared with ADR121AUJZ-REEL7, the ADR121BUJZ-REEL7 delivers tighter initial accuracy and lower temperature drift - critical for calibration-grade instruments - while REF192GS offers SOIC-8 ease-of-use at the expense of size and quiescent current efficiency.
Availability
ADR121BUJZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical equipment, and data acquisition systems requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for ADR121BUJZ-REEL7 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.
The ADR12x family was designed specifically for micropower, high-accuracy voltage referencing in space- and energy-constrained applications - emphasizing low dropout, ultra-low noise, and extended temperature reliability.
FAQ
What is the maximum input voltage rating for ADR121BUJZ-REEL7?
The absolute maximum input voltage for ADR121BUJZ-REEL7 is 20 V relative to GND, per the Absolute Maximum Ratings table. Continuous operation above 18 V is not recommended, as it may exceed thermal limits given the TSOT-6 package's 230°C/W junction-to-ambient thermal resistance. For reliable long-term operation, keep VIN ≤18 V with adequate PCB copper pour for heat dissipation.
Does ADR121BUJZ-REEL7 require an input capacitor?
No, ADR121BUJZ-REEL7 does not require an input capacitor for stability. However, adding a 1 μF to 10 μF ceramic capacitor in parallel with a 0.1 μF capacitor improves transient response during sudden supply changes. This configuration reduces noise coupling from noisy rails and is recommended in battery-powered systems with switching regulators upstream of the reference.
Can ADR121BUJZ-REEL7 drive a 5 kΩ load directly?
Yes, ADR121BUJZ-REEL7 can drive a 5 kΩ load directly. At 2.5 V output, a 5 kΩ load draws 0.5 mA - well within its 5 mA sourcing capability. Load regulation remains ≤300 ppm/mA, so output deviation is <0.15 mV. No external buffer is needed unless the application demands sub-microvolt stability under dynamic load conditions.
What is the turn-on settling time specification for ADR121BUJZ-REEL7?
The turn-on settling time for ADR121BUJZ-REEL7 is 100 μs to 0.1% of final value with a 0.2 μF output capacitor, as specified in the ADR121 Electrical Characteristics table. This timing applies across −40°C to +125°C and ensures rapid stabilization after power-up in portable devices with aggressive wake/sleep cycles.
Is ADR121BUJZ-REEL7 compatible with lead-free reflow profiles?
Yes, ADR121BUJZ-REEL7 is RoHS-compliant (denoted by "Z" in the part number) and qualified for standard lead-free reflow. Its TSOT-6 package supports peak reflow temperatures up to 220°C for 15 seconds (infrared) or 215°C for 60 seconds (vapor phase), aligning with IPC/JEDEC J-STD-020 moisture sensitivity level 1 requirements.
ADR121BUJZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 9ppm/°C
- Noise - 0.1Hz to 10Hz:
- 18µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.8V ~ 18V
- Current - Supply:
- 95µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-6
ADR121BUJZ-REEL7 FAQ
1.How can I place an order for ADR121BUJZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR121BUJZ-REEL7 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 ADR121BUJZ-REEL7 reliable?
The price and inventory of ADR121BUJZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR121BUJZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR121BUJZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR121BUJZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR121BUJZ-REEL7?
ADR121BUJZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR121BUJZ-REEL7 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 ADR121BUJZ-REEL7?
For technical support, including ADR121BUJZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR121BUJZ-REEL7 requirements.
6.How does Aetrix verify that ADR121BUJZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR121BUJZ-REEL7 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 ADR121BUJZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR121BUJZ-REEL7?
All ADR121BUJZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR121BUJZ-REEL7, 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 ADR121BUJZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR121BUJZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADR121BUJZ-REEL7 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
