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ADM1021ARQZ Equivalent & Substitute Parts
Part Overview
The ADM1021ARQZ is a dual-channel temperature monitoring system sensor manufactured by onsemi, designed for applications requiring internal and external temperature sensing with SMBus output interface. This component operates across a 3V to 5.5V supply range and provides temperature monitoring from 0°C to 100°C with integrated alarm functionality.
The ADM1021ARQZ is classified as an obsolete product. Identifying equivalent substitute parts is necessary for ongoing system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | onsemi |
| Category | Power Management (PMIC) |
| Function | Temp Monitoring System (Sensor) |
| Sensor Type | Internal and External |
| Sensing Temperature Range | 0°C ~ 100°C, External Sensor |
| Accuracy | ±1°C Local, ±5°C Remote |
| Output Type | SMBus |
| Output Alarm | Yes |
| Voltage Supply | 3V ~ 5.5V |
| Operating Temperature | 0°C ~ 100°C |
| Package / Case | 16-SSOP (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Topology | ADC, Comparator, Multiplexer, Register Bank |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
| ECCN | EAR99 |
Substitute Part Grouping Explanation
Substitution eligibility for the ADM1021ARQZ is determined by the following critical parameters:
- Identical sensor topology (ADC, Comparator, Multiplexer, Register Bank)
- Matching sensor type (Internal and External)
- Identical temperature sensing range (0°C ~ 100°C, External Sensor)
- Identical output interface (SMBus)
- Identical alarm output capability
- Matching supply voltage range (3V ~ 5.5V)
- Identical package and pinout (16-SSOP)
- Identical mounting type (Surface Mount)
- Compliance with REACH and ECCN requirements
The ADM1021AARQZ-R meets all substitution criteria and is classified as an active product with current manufacturing status.
Parameter Comparison
| Parameter | ADM1021ARQZ | ADM1021AARQZ-R |
|---|---|---|
| Manufacturer | onsemi | onsemi |
| Function | Temp Monitoring System (Sensor) | Temp Monitoring System (Sensor) |
| Sensor Type | Internal and External | Internal and External |
| Sensing Temperature Range | 0°C ~ 100°C, External Sensor | 0°C ~ 100°C, External Sensor |
| Accuracy - Local | ±1°C | ±3°C (Max) |
| Accuracy - Remote | ±5°C | ±5°C (Max) |
| Output Type | SMBus | SMBus |
| Output Alarm | Yes | Yes |
| Voltage Supply | 3V ~ 5.5V | 3V ~ 5.5V |
| Operating Temperature | 0°C ~ 100°C | 0°C ~ 100°C |
| Package / Case | 16-SSOP (0.154", 3.90mm Width) | 16-SSOP (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount | Surface Mount |
| Topology | ADC, Comparator, Multiplexer, Register Bank | ADC, Comparator, Multiplexer, Register Bank |
| Packaging Format | Bulk | Tape & Reel (TR) |
| Product Status | Obsolete | Active |
| RoHS Status | Not specified | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
| ECCN | EAR99 | EAR99 |
Engineering Selection Recommendations
The ADM1021AARQZ-R is a direct functional substitute for the ADM1021ARQZ. Both components share identical electrical specifications, pinout, package geometry, and interface protocols. The primary differences are product status and packaging format.
The ADM1021ARQZ is obsolete, making the ADM1021AARQZ-R the appropriate selection for new designs and ongoing procurement. The ADM1021AARQZ-R carries active product status with current manufacturing support and ROHS3 compliance certification, providing assurance of long-term availability and regulatory alignment.
Local temperature accuracy differs between the two parts (±1°C versus ±3°C maximum). Applications requiring the tighter ±1°C local accuracy specification of the original ADM1021ARQZ should evaluate whether the ±3°C maximum accuracy of the ADM1021AARQZ-R meets system requirements.
Both components are supplied in identical 16-SSOP packages suitable for surface mount assembly. The ADM1021AARQZ-R is available in Tape & Reel packaging format, which is standard for automated manufacturing processes.
Frequently Asked Questions (FAQ)
Q: Can the ADM1021AARQZ-R replace the ADM1021ARQZ in existing designs?
A: Yes. Both components share identical pinout, package dimensions, supply voltage range, temperature sensing range, SMBus interface, and alarm functionality. Direct substitution is electrically and mechanically compatible.
Q: What is the difference in local temperature accuracy between these parts?
A: The ADM1021ARQZ specifies ±1°C local accuracy, while the ADM1021AARQZ-R specifies ±3°C maximum local accuracy. Remote sensor accuracy remains ±5°C for both parts. System designs must confirm that ±3°C accuracy is acceptable for the intended application.
Q: Why is the ADM1021ARQZ listed as obsolete?
A: The ADM1021ARQZ has reached end-of-life status. The ADM1021AARQZ-R is the active equivalent part maintained in current production by onsemi.
Q: Are there packaging differences between these parts?
A: The ADM1021ARQZ is supplied in bulk packaging. The ADM1021AARQZ-R is supplied in Tape & Reel (TR) format, which is standard for high-volume automated assembly operations.
Q: Do both parts meet regulatory compliance requirements?
A: Both components are REACH Unaffected and classified as EAR99 for export control purposes. The ADM1021AARQZ-R additionally carries ROHS3 compliance certification.
Q: What is the Moisture Sensitivity Level (MSL) for these components?
A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.
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