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AD8138ARM Equivalent & Substitute Parts
Part Overview
The AD8138ARM is an ADC Driver IC manufactured by Analog Devices Inc., designed for data acquisition applications. This 8-MSOP surface mount device operates as a linear amplifier in the ADC driver category. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain functional compatibility within data acquisition signal conditioning circuits while meeting equivalent electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | AD8138ARM |
| Manufacturer | Analog Devices Inc. |
| Category | Linear, Amplifiers |
| Type | ADC Driver |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Supplier Device Package | 8-MSOP |
| Mounting Type | Surface Mount |
| Applications | Data Acquisition |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the AD8138ARM are classified into two categories based on substitution compatibility:
Direct Substitutes (Same Manufacturer, Active Status): The AD8138ARMZ represents a direct substitute from Analog Devices Inc. This part maintains identical electrical specifications, package configuration (8-MSOP), and functional classification as an ADC Driver. The primary distinction is product status (Active vs. Obsolete) and packaging format (Tube). This part is suitable for direct replacement in existing designs.
Functional Equivalents (Alternative Manufacturers, Differential Amplifiers): Parts from Texas Instruments (THS4500, THS4501, THS4503 series) and Analog Devices (ADA4932-1YCPZ-R7) function as differential amplifiers with comparable electrical performance characteristics. These parts share the following critical parameters:
- Surface mount technology
- 8-pin package configurations (8-VSSOP, 8-HVSSOP)
- Differential amplifier topology
- Slew rate: 2800V/µs
- Gain bandwidth product: 300 MHz
- -3dB bandwidth: 370 MHz
- Current supply: 23mA
- Voltage supply span: 4.5V to 15V
- Moisture sensitivity level: 1 (Unlimited)
- RoHS3 compliance
- REACH unaffected status
The ADA4932-1YCPZ-R7 operates in a 16-pin package and exhibits higher performance specifications (560 MHz bandwidth, 9.6mA supply current) but maintains differential amplifier functionality suitable for advanced data acquisition applications.
Parameter Comparison
| Part Number | Manufacturer | Type | Package | Mounting | Product Status | MSL | RoHS Status |
|---|---|---|---|---|---|---|---|
| AD8138ARM | Analog Devices Inc. | ADC Driver | 8-MSOP | Surface Mount | Obsolete | 1 | Not specified |
| AD8138ARMZ | Analog Devices Inc. | ADC Driver | 8-MSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4500IDGK | Texas Instruments | Differential Amplifier | 8-VSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4501CDGN | Texas Instruments | Differential Amplifier | 8-HVSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4501IDGK | Texas Instruments | Differential Amplifier | 8-VSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4501IDGN | Texas Instruments | Differential Amplifier | 8-HVSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4503CDGK | Texas Instruments | Differential Amplifier | 8-VSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4503CDGN | Texas Instruments | Differential Amplifier | 8-HVSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4503CDGNR | Texas Instruments | Differential Amplifier | 8-HVSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| THS4503IDGK | Texas Instruments | Differential Amplifier | 8-VSSOP | Surface Mount | Active | 1 | ROHS3 Compliant |
| ADA4932-1YCPZ-R7 | Analog Devices Inc. | Differential Amplifier | 16-LFCSP-VQ (3x3) | Surface Mount | Active | 3 | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: AD8138ARMZ
The AD8138ARMZ is the optimal substitute for the obsolete AD8138ARM. This part is manufactured by Analog Devices Inc., maintaining design continuity with the original component. Both parts share identical electrical specifications, package configuration (8-MSOP), and functional classification. The AD8138ARMZ carries Active product status and ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. Inventory availability is confirmed at 1,745 pieces. This part requires no circuit redesign and provides direct pin-for-pin compatibility.
Secondary Recommendations: Texas Instruments THS45xx Series
The THS4500IDGK, THS4501 series (CDGN, IDGK, IDGN), and THS4503 series (CDGK, CDGN, CDGNR, IDGK) function as differential amplifiers suitable for data acquisition applications. These parts operate with identical slew rate (2800V/µs), gain bandwidth product (300 MHz), and -3dB bandwidth (370 MHz) specifications. All variants feature 8-pin surface mount packages (8-VSSOP or 8-HVSSOP), MSL Level 1, ROHS3 compliance, and REACH unaffected status. Selection among THS45xx variants depends on operating temperature requirements and package pad configuration (standard vs. exposed pad). These parts are suitable for applications where cross-manufacturer substitution is acceptable.
Alternative Recommendation: ADA4932-1YCPZ-R7
The ADA4932-1YCPZ-R7 represents an advanced differential amplifier option from Analog Devices Inc. This part operates at higher performance levels (560 MHz bandwidth, 2800V/µs slew rate) and is packaged in a 16-pin LFCSP configuration. The higher MSL rating (Level 3) requires extended moisture control during handling. This part is suitable for designs requiring enhanced bandwidth performance and where package size constraints permit the larger footprint.
Frequently Asked Questions (FAQ)
Q: Can AD8138ARMZ be used as a direct replacement for AD8138ARM?
A: Yes. The AD8138ARMZ is a direct substitute. Both parts share identical electrical specifications, 8-MSOP package configuration, and ADC driver functionality. The primary differences are product status (Active vs. Obsolete) and packaging format (Tube). No circuit modifications are required.
Q: What are the key differences between 8-VSSOP and 8-HVSSOP packages?
A: Both packages are 8-pin surface mount configurations with 0.118" (3.00mm) width. The 8-HVSSOP variant includes an exposed pad for enhanced thermal management. Package selection depends on thermal requirements and PCB layout capabilities. Pin assignments remain consistent across both variants within the THS45xx series.
Q: Are THS45xx parts compatible with AD8138ARM in existing designs?
A: THS45xx parts function as differential amplifiers with comparable electrical performance (2800V/µs slew rate, 300 MHz gain bandwidth product, 370 MHz -3dB bandwidth). However, these are functional equivalents rather than direct replacements. Circuit evaluation is required to confirm compatibility with specific application requirements, including input/output impedance matching and biasing networks.
Q: What is the significance of MSL Level 1 vs. Level 3?
A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control requirements. MSL Level 3 requires controlled storage conditions (168-hour maximum exposure at specified humidity). Parts with MSL Level 1 (AD8138ARMZ, THS45xx series) offer simpler handling and storage logistics compared to MSL Level 3 components (ADA4932-1YCPZ-R7).
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All active substitute parts listed (AD8138ARMZ, THS4500IDGK, THS4501 series, THS4503 series, ADA4932-1YCPZ-R7) carry ROHS3 compliance certification. The original AD8138ARM does not specify RoHS status due to its obsolete classification.
Q: What inventory levels are available for substitute parts?
A: AD8138ARMZ: 1,745 pieces; THS4500IDGK: 701 pieces; THS4501CDGN: 668 pieces; THS4501IDGK: 1,450 pieces; THS4501IDGN: 1,197 pieces; THS4503CDGK: 1,129 pieces; THS4503CDGN: 867 pieces; THS4503CDGNR: 1,728 pieces; THS4503IDGK: 1,300 pieces; ADA4932-1YCPZ-R7: 7,909 pieces.
Q: Can ADA4932-1YCPZ-R7 replace AD8138ARM in standard applications?
A: The ADA4932-1YCPZ-R7 offers higher performance specifications (560 MHz bandwidth vs. standard ADC driver performance) and operates in a 16-pin package. This part is suitable for advanced data acquisition designs requiring enhanced bandwidth. The larger package footprint and higher MSL rating (Level 3) require design evaluation and PCB layout modifications.
Q: What operating temperature ranges are available among substitute parts?
A: AD8138ARMZ: Not specified; THS4500IDGK: -40°C to 85°C; THS4501CDGN: 0°C to 70°C; THS4501IDGK: -40°C to 85°C; THS4501IDGN: -40°C to 85°C; THS4503CDGK: 0°C to 70°C; THS4503CDGN: 0°C to 70°C; THS4503CDGNR: 0°C to 70°C; THS4503IDGK: -40°C to 85°C; ADA4932-1YCPZ-R7: -40°C to 105°C. Selection depends on application temperature requirements.
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