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DAC7802LP Equivalent & Substitute Parts
Part Overview
The DAC7802LP is a 12-bit digital-to-analog converter manufactured by Texas Instruments, designed for data acquisition applications requiring dual D/A conversion channels with current output. This component features an R-2R architecture with 800ns settling time and operates from ±5V supply voltages across an industrial temperature range of -40°C to 85°C.
The DAC7802LP is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity where original inventory is depleted or unavailable.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of Bits | 12 |
| Number of D/A Converters | 2 |
| Settling Time | 800ns |
| Output Type | Current - Unbuffered |
| Data Interface | Parallel |
| Reference Type | External |
| Voltage - Supply, Analog | 5V |
| Voltage - Supply, Digital | 5V |
| INL/DNL (LSB) | ±0.5 (Max), ±1 (Max) |
| Architecture | R-2R |
| Operating Temperature | -40°C ~ 85°C |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the DAC7802LP is determined by strict equivalence across the following critical parameters:
- Resolution: 12 bits
- Channel count: 2 D/A converters
- Output configuration: Current - Unbuffered
- Interface: Parallel data input
- Reference input: External
- Supply voltages: 5V analog and digital
- Linearity specifications: INL/DNL ±0.5 (Max), ±1 (Max)
- Conversion architecture: R-2R
- Temperature range: -40°C to 85°C
The DAC7802LU qualifies as a direct functional equivalent, maintaining identical electrical specifications and performance characteristics. The primary distinction is packaging format: the DAC7802LP uses through-hole 24-DIP mounting, while the DAC7802LU employs surface-mount 24-SOIC packaging.
Parameter Comparison
| Parameter | DAC7802LP | DAC7802LU |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Number of Bits | 12 | 12 |
| Number of D/A Converters | 2 | 2 |
| Settling Time | 800ns | 800ns |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Data Interface | Parallel | Parallel |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| INL/DNL (LSB) | ±0.5 (Max), ±1 (Max) | ±0.5 (Max), ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 24-DIP (0.300", 7.62mm) | 24-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Through Hole | Surface Mount |
| Product Status | Obsolete | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 3 (168 Hours) |
Engineering Selection Recommendations
The DAC7802LU is the direct functional substitute for the DAC7802LP. Both components maintain identical electrical performance, linearity, and operational specifications. Selection between these parts depends on board-level design constraints:
DAC7802LP (Through-Hole DIP): Suitable for legacy through-hole PCB designs, breadboard prototyping, and applications where existing board layouts cannot be modified. Product status is obsolete; availability is limited to existing inventory.
DAC7802LU (Surface-Mount SOIC): Recommended for new designs, production systems, and applications where PCB real estate optimization is required. This part carries active product status from Texas Instruments, ensuring ongoing availability and supply chain stability. Both components are ROHS3 compliant and REACH unaffected.
The moisture sensitivity level differs between packages: DAC7802LP (MSL 1, unlimited shelf life) versus DAC7802LU (MSL 3, 168-hour floor life after moisture exposure). Storage and handling procedures must account for this distinction in surface-mount applications.
Frequently Asked Questions (FAQ)
Q: Can the DAC7802LU directly replace the DAC7802LP in an existing circuit?
A: Electrical substitution is complete. The DAC7802LU provides identical functional performance and pin-level compatibility. However, physical board integration differs: the DAC7802LP uses through-hole mounting while the DAC7802LU requires surface-mount soldering. PCB redesign is necessary for mechanical integration.
Q: What is the primary reason to substitute the DAC7802LP?
A: The DAC7802LP is obsolete. The DAC7802LU is the active equivalent from Texas Instruments, ensuring long-term availability and supply chain continuity.
Q: Are there differences in performance specifications between these parts?
A: No. Both components share identical resolution (12 bits), channel count (2), settling time (800ns), linearity (±0.5/±1 LSB), supply voltages (5V), and operating temperature range (-40°C to 85°C).
Q: What packaging considerations apply to the DAC7802LU?
A: The DAC7802LU is a 24-pin SOIC surface-mount package with MSL 3 rating. Moisture sensitivity requires controlled storage conditions (168 hours maximum floor life after bag opening). The DAC7802LP through-hole package has MSL 1 (unlimited shelf life).
Q: Are both parts RoHS compliant?
A: Yes. Both the DAC7802LP and DAC7802LU are ROHS3 compliant and REACH unaffected.
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