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AD7871KNZ Equivalent & Substitute Parts
Part Overview
The AD7871KNZ is a 14-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc., designed for single-ended input data acquisition applications. It features a Successive Approximation Register (SAR) architecture with an 83 kSPS sampling rate and operates with ±5V analog and digital supply voltages. The device is packaged in a 28-pin DIP configuration suitable for through-hole mounting.
The AD7871KNZ is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesign initiatives.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resolution (Number of Bits) | 14 |
| Sampling Rate | 83 kSPS |
| Number of Inputs | 1 |
| Input Type | Single Ended |
| Data Interface | SPI, Parallel |
| Architecture | SAR |
| Reference Type | Internal |
| Voltage - Supply, Analog | ±5V |
| Voltage - Supply, Digital | ±5V |
| Operating Temperature Range | 0°C to 70°C |
| Package / Case | 28-DIP (0.600", 15.24mm) |
| Mounting Type | Through Hole |
Substitute Part Grouping Explanation
Substitute parts for the AD7871KNZ are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:
- Resolution: 14 bits
- Sampling Rate: 83 kSPS
- Number of Inputs: 1
- Input Type: Single Ended
- Data Interface: SPI and Parallel support
- Architecture: SAR
- Reference Type: Internal
- Supply Voltages: ±5V (both analog and digital)
- Operating Temperature Range: 0°C to 70°C
- Package: 28-DIP through-hole configuration
- Base Product Number: AD7871
The AD7871JNZ meets all these criteria and qualifies as a direct substitute. The primary distinction is product status: AD7871KNZ is obsolete, while AD7871JNZ is active.
Parameter Comparison
| Parameter | AD7871KNZ | AD7871JNZ |
|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. |
| Number of Bits | 14 | 14 |
| Sampling Rate (Per Second) | 83k | 83k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | SPI, Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S/H:ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | Internal | Internal |
| Voltage - Supply, Analog | ±5V | ±5V |
| Voltage - Supply, Digital | ±5V | ±5V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
| Package / Case | 28-DIP (0.600", 15.24mm) | 28-DIP (0.600", 15.24mm) |
| Supplier Device Package | 28-PDIP | 28-PDIP |
| Mounting Type | Through Hole | Through Hole |
| Base Product Number | AD7871 | AD7871 |
| Product Status | Obsolete | Active |
| RoHS Status | Not specified | ROHS3 Compliant |
| REACH Status | Not specified | REACH Unaffected |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| ECCN | EAR99 | EAR99 |
| HTSUS | 8542.39.0001 | 8542.39.0001 |
Engineering Selection Recommendations
The AD7871JNZ is the direct substitute for the AD7871KNZ. Both devices share identical electrical specifications, pin configurations, and functional characteristics. The AD7871JNZ is preferred for new designs and ongoing production due to its active product status.
The AD7871JNZ carries ROHS3 compliance and REACH unaffected status, providing regulatory advantages for applications subject to environmental and hazardous substance restrictions. The AD7871KNZ, being obsolete, should be replaced with the AD7871JNZ in legacy system redesigns or when existing inventory is depleted.
Both devices maintain the same moisture sensitivity level (MSL 1) and export classification (EAR99), ensuring compatibility with existing supply chain and regulatory documentation.
Frequently Asked Questions (FAQ)
Q: Can the AD7871JNZ be used as a direct replacement for the AD7871KNZ?
A: Yes. The AD7871JNZ is electrically and mechanically identical to the AD7871KNZ. All electrical parameters, pin assignments, package dimensions, and functional specifications are equivalent. The primary difference is product status: AD7871JNZ is active, while AD7871KNZ is obsolete.
Q: What is the difference between the AD7871KNZ and AD7871JNZ?
A: The devices are functionally identical. The difference lies in product lifecycle status and compliance certifications. The AD7871JNZ is an active product with ROHS3 compliance and REACH unaffected status, while the AD7871KNZ is obsolete. The suffix "K" and "J" indicate different temperature or performance grades within the AD7871 family, but both operate within the 0°C to 70°C range with identical specifications.
Q: Are there any package or pinout differences?
A: No. Both the AD7871KNZ and AD7871JNZ use the 28-PDIP (28-pin Dual In-line Package) configuration with identical pinout and mechanical dimensions (0.600", 15.24mm).
Q: What supply voltages do these devices require?
A: Both devices require ±5V for analog supply and ±5V for digital supply. Ensure your power distribution design accommodates dual-rail ±5V operation.
Q: Can these devices be used in new designs?
A: The AD7871JNZ is suitable for new designs as it maintains active product status. The AD7871KNZ should not be used in new designs due to its obsolete classification. For legacy system maintenance, the AD7871JNZ provides continuity with improved regulatory compliance.
Q: What is the sampling rate of these ADCs?
A: Both devices operate at 83 kSPS (kilosamples per second), suitable for moderate-speed data acquisition applications requiring 14-bit resolution.
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