My Inquiry
My Account
Analog Devices Inc. ADR421ARMZ
- Part No.:
- ADR421ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADR421ARMZ.pdf
- Description:
- IC VREF SERIES 0.12% 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:826
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADR421ARMZ from Analog Devices is an ultraprecision XFET® voltage reference delivering 2.500 V output with ±1 mV (±0.04%) initial accuracy, 3 ppm/°C max temperature coefficient, and 1.75 μV p-p (0.1 Hz to 10 Hz) low-frequency noise. It operates from 4.5 V to 18 V supply, supports 10 mA output current, and is used in high-resolution ADC/DAC biasing for optical network control circuits and portable medical instrumentation.
For engineers reviewing the ADR421ARMZ datasheet, ADR421ARMZ pinout, ADR421ARMZ application, or ADR421ARMZ equivalent, key selection criteria include long-term stability (50 ppm/1000 h), load regulation (70 ppm/mA), trim capability (±0.5% adjustment), and SOIC-8/MSOP-8 package compatibility in precision data acquisition systems.
Technical Context
The ADR421ARMZ employs patented XFET architecture-using two JFETs with differential pinch-off voltage-to generate a stable ~0.5 V intrinsic reference, then applies PTAT-based curvature correction to achieve ultra-low 3 ppm/°C drift. This eliminates the high-noise compensation circuitry typical of bandgap references.
It features a dedicated TRIM pin enabling ±0.5% output adjustment without degrading temperature coefficient or long-term stability, and integrates robust line regulation (35 ppm/V) and load regulation (70 ppm/mA) across −40°C to +125°C, making it suitable for industrial process control and battery-powered instrumentation where supply headroom and thermal cycling are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±1 mV (B-grade); enables direct interface with 2.5 V ADC reference inputs without scaling. |
| Temp Coefficient | 3 ppm/°C max (−40°C to +125°C); ensures ≤ ±0.75 mV total drift over full industrial range. |
| Voltage Noise | 1.75 μV p-p (0.1–10 Hz); preserves SNR in 20+ bit SAR and delta-sigma converters. |
| Long-Term Stability | 50 ppm/1000 h at 125°C; guarantees minimal calibration drift in deployed field instruments. |
| Quiescent Current | 500 µA max; allows operation from low-power LDOs in portable medical devices. |
| Output Current | 10 mA sink/source; drives ADC reference inputs, op-amp bias networks, and DAC buffers directly. |
| Supply Range | 4.5 V to 18 V; accommodates wide-input industrial supplies and battery-backed systems. |
Pinout & Package
ADR421ARMZ is available in 8-lead SOIC (R) and 8-lead MSOP (RM) packages. Both share identical pinout and internal connectivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 (TP) | Test Pin | Factory test access only; no user connection permitted-floating or loaded may impair performance. |
| 2 (VIN) | Input Supply | Accepts 4.5 V–18 V; requires ≥2 V headroom above VOUT for regulation. |
| 3, 7 (NIC) | No Internal Connection | Unbonded die pads; must remain unconnected and unstubbed on PCB. |
| 4 (GND) | Analog Ground | Primary return path; must tie to clean analog ground plane with low-inductance connection. |
| 5 (TRIM) | Voltage Adjustment | Connects to external resistor divider for ±0.5% fine-tuning of VOUT without affecting TC or stability. |
| 6 (VOUT) | Precision Output | Delivers 2.500 V reference; bypass with 0.1 µF ceramic capacitor to GND for optimal noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Core | Uses implanted JFET pair with curvature-corrected PTAT current-enables 3 ppm/°C drift and 1.75 μV p-p noise without buried Zener power penalty. |
| Trim Terminal (TRIM) | Supports ±0.5% output adjustment via external resistors while preserving initial accuracy, TC, and long-term stability specifications. |
| Wide Temperature Range | Specified from −40°C to +125°C; validated for use in industrial process controllers and automotive under-hood sensor modules. |
| No Output Capacitor Required | Remains stable with capacitive loads up to 10 µF; simplifies layout and avoids phase-margin risks common in bandgap references. |
| Low Quiescent Power | 500 µA max supply current enables integration into energy-constrained battery-powered instruments with >1-year runtime. |
Applications
| Optical Network Control Circuits | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Biasing laser diode drivers and monitoring photodiode transimpedance amplifiers in DWDM transceivers. IC Role / Device Role / Timing Role: Provides stable 2.500 V reference for 16-bit ADCs digitizing optical power feedback signals. Use Value: 1.75 μV p-p noise and 3 ppm/°C TC ensure <0.001% gain error stability across temperature and time, meeting GR-468 reliability requirements. |
Use Scenario: High-accuracy sensor signal conditioning in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Serves as master reference for simultaneous sampling 24-bit delta-sigma ADCs measuring strain gauges and RTDs. Use Value: 50 ppm/1000 h long-term stability eliminates need for field recalibration during 10-year PLC deployment cycles. |
| Battery-Powered Instrumentation | Portable Medical Instruments |
Use Scenario: Portable gas analyzers using electrochemical sensors requiring calibrated voltage excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Supplies precision 2.500 V reference to both sensor excitation circuit and ADC reference input for ratiometric rejection of supply variation. Use Value: 500 µA quiescent current extends AA/AAA battery life to >18 months in low-duty-cycle handheld units. |
Use Scenario: ECG front-end modules in handheld patient monitors requiring low-noise, drift-free DC bias for amplifier stages and ADC references. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 2.500 V reference to 24-bit sigma-delta ADCs capturing microvolt-level cardiac signals. Use Value: 1.75 μV p-p (0.1–10 Hz) noise floor prevents degradation of diagnostic SNR in sub-1 µV QRS complexes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR441ARMZ | Lower 0.9 ppm/°C max TC, higher 2.5 V initial accuracy (±0.25 mV), but 1.2 mA quiescent current and 7 V min supply. | Better drift performance for metrology-grade calibrators; unsuitable for low-voltage battery operation. | Select ADR441ARMZ when ultimate temperature stability outweighs power budget constraints. |
| REF5025IDR | 2.5 V output, 3 ppm/°C TC, but 3.8 μV p-p noise (0.1–10 Hz) and no TRIM pin; SOIC-8 only. | Cost-optimized alternative for non-adjustable, noise-tolerant industrial DAQ where trimming is unnecessary. | Choose REF5025IDR for fixed-reference designs where 2× higher noise is acceptable and BOM cost is prioritized. |
Compared with ADR421ARMZ, ADR441ARMZ offers superior drift control at higher quiescent power, while REF5025IDR trades adjustability and ultra-low noise for lower unit cost and simpler layout-making ADR421ARMZ the balanced choice for portable, trim-capable, high-SNR precision systems.
Availability
ADR421ARMZ is available at Aetrix Electronics and suitable for precision data acquisition systems, optical network control circuits, and portable medical instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ADR421ARMZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADR42x series was designed specifically for ultraprecision voltage reference applications demanding low noise, low drift, and high long-term stability in industrial, medical, and optical infrastructure equipment.
FAQ
What is the maximum load current supported by the ADR421ARMZ?
The ADR421ARMZ delivers up to 10 mA of output current while maintaining all specified accuracy, noise, and regulation parameters across −40°C to +125°C. It can source or sink this current, enabling direct drive of ADC reference inputs, op-amp bias networks, and small DAC buffers without external buffering. Short-circuit current is rated at 27 mA, providing inherent fault tolerance.
Can the ADR421ARMZ be used with a 3.3 V supply?
No-the ADR421ARMZ requires a minimum supply voltage of 4.5 V to maintain regulation, due to its 2 V minimum supply headroom (VIN − VOUT ≥ 2 V). With a 2.500 V output, the absolute minimum VIN is 4.5 V. A 3.3 V rail is insufficient and will result in dropout and loss of reference accuracy. Use ADR3425 or ADR361 for 3.3 V-compatible 2.5 V references.
Does the ADR421ARMZ require an output capacitor for stability?
No-unlike many bandgap references, the ADR421ARMZ is inherently stable with any capacitive load, including 0 µF. A 0.1 µF ceramic capacitor from VOUT to GND is recommended solely to reduce broadband noise; larger values (up to 10 µF) improve load transient response but increase turn-on settling time proportionally. No compensation network is needed.
How does the TRIM pin on the ADR421ARMZ function?
The TRIM pin on the ADR421ARMZ connects to an internal resistor divider node and allows ±0.5% adjustment of the 2.500 V output using two external resistors. This adjustment preserves the device's specified temperature coefficient, long-term stability, and noise performance. The TRIM terminal must not be left floating-it must be terminated per the datasheet's recommended resistor configuration.
What is the long-term stability specification for the ADR421ARMZ?
The ADR421ARMZ exhibits 50 ppm maximum output voltage shift after 1000 hours of operation at +125°C-equivalent to approximately 0.125 mV drift for the 2.500 V output. This value is measured at 25°C before and after the stress test and reflects typical aging behavior in high-reliability applications such as industrial process controllers and field-deployed instrumentation.
ADR421ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- XFET®
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.75µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 18V
- Current - Supply:
- 600µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ADR421ARMZ FAQ
1.How can I place an order for ADR421ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR421ARMZ 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 ADR421ARMZ reliable?
The price and inventory of ADR421ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR421ARMZ is usually 5 days.
3.What payment methods are accepted for ADR421ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR421ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR421ARMZ?
ADR421ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR421ARMZ 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 ADR421ARMZ?
For technical support, including ADR421ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR421ARMZ requirements.
6.How does Aetrix verify that ADR421ARMZ is sourced from the original manufacturer or authorized distributors?
All ADR421ARMZ 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 ADR421ARMZ meets industry standards.
7.What is the process for return or replacement of ADR421ARMZ?
All ADR421ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADR421ARMZ, 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 ADR421ARMZ part is unused and in its original packaging.
Return procedure for ADR421ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADR421ARMZ 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…
