Part A
AD8304ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2030 PCS
- Series
- Linear - Amplifiers - Special Purpose Amplifiers
Replacement verdict
Compatible functional replacement candidate
The AD8304ARUZ and AD8304ARU are functionally equivalent logarithmic detector/controller ICs from Analog Devices, sharing the same core die, transfer function, and operating specifications. The ARUZ suffix denotes RoHS-compliant lead-free packaging, while the ARU suffix indicates the older lead-bearing (non-RoHS) package. Both parts are interchangeable in electrical performance, with the ARUZ being the environmentally compliant successor recommended for new designs.
Function and Transfer Characteristic
High match
Package Type and Pinout
High match
Operating Temperature Range
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD8304ARUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2339 PCS
- Package
- TSSOP-14
- Series
- Linear - Amplifiers - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8304ARUZ | AD8304ARU | Why it matters |
|---|---|---|---|
| Package / Mounting | 14-Lead TSSOP (RU-14), RoHS-compliant | 14-Lead TSSOP (RU-14), non-RoHS | The Z suffix denotes RoHS compliance; the non-Z part may not meet lead-free/restricted-substance requirements for new designs. |
| RoHS Status | RoHS compliant (lead-free) | Non-RoHS (contains lead) | RoHS compliance affects regulatory acceptance and solder process compatibility; non-compliant parts may be restricted in many markets. |
| Lead Finish | Matte tin (Sn) lead-free | Tin-lead (SnPb) | Lead finish determines reflow profile and whether the part can be used in lead-free assembly lines. |
| Lifecycle / Availability | Active, recommended for new designs | Obsolete / not recommended for new designs | An obsolete part risks supply shortages and last-time-buy constraints, making the active variant preferable for production. |
| Function | 160 dB logarithmic detector / logarithmic amplifier | 160 dB logarithmic detector / logarithmic amplifier | Identical core function confirms the two parts are functionally interchangeable in the same circuit role. |
| Supply Voltage Range | 3.0 V to 5.5 V | 3.0 V to 5.5 V | Matching supply range ensures the same power rail can be used without redesign. |
| Dynamic Range | 160 dB (10 nA to 10 mA input) | 160 dB (10 nA to 10 mA input) | Dynamic range defines the measurable signal span; identical values mean equivalent measurement performance. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature rating ensures equivalent environmental suitability for industrial applications. |
| Pin Count / Footprint | 14 pins, TSSOP | 14 pins, TSSOP | Identical package and pinout allow drop-in board replacement without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8304ARU | AD8304ARUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Base Product Number | AD8304 | - |
| Type | Logarithmic Converter | Logarithmic Converter |
| Applications | Fiber Optics | Fiber Optics |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tube | - |
Frequently asked questions
What is the difference between the AD8304ARUZ and the AD8304ARU?
The AD8304ARUZ and AD8304ARU are both AD8304 160 dB logarithmic detectors from Analog Devices in a 14-lead TSSOP package. The primary difference is the suffix: the "Z" designation on the AD8304ARUZ indicates RoHS-compliant, lead-free construction, while the AD8304ARU is the non-RoHS (leaded) version. Both share the same functional specifications and pinout.
Are the AD8304ARUZ and AD8304ARU electrically and functionally interchangeable?
Yes. Both parts are the same AD8304 logarithmic detector die in the same 14-lead TSSOP package with identical pinout and electrical specifications. The only documented difference is the RoHS/lead-free status indicated by the "Z" suffix, so they are functionally interchangeable in circuit design.
What is the AD8304 logarithmic detector used for?
The AD8304 is a 160 dB logarithmic detector intended for optical power measurement and general-purpose logarithmic signal detection. It provides a logarithmic output proportional to the input current or voltage, making it suitable for applications such as fiber-optic power monitoring and wide-dynamic-range signal measurement.
What package do the AD8304ARUZ and AD8304ARU use?
Both the AD8304ARUZ and AD8304ARU are supplied in a 14-lead TSSOP (Thin Shrink Small Outline Package). The package and pinout are identical between the two variants.
Does the "Z" suffix on the AD8304ARUZ affect electrical performance?
No. The "Z" suffix denotes RoHS compliance and lead-free construction and does not change the electrical specifications. The AD8304ARUZ and AD8304ARU share the same functional and performance characteristics as documented by Analog Devices.
Which variant should be selected for a RoHS-compliant design?
For designs requiring RoHS compliance, the AD8304ARUZ should be selected because its "Z" suffix indicates lead-free, RoHS-compliant construction. The AD8304ARU is the non-RoHS version and should be used only where leaded construction is acceptable.
Can the AD8304ARUZ be used as a drop-in replacement for the AD8304ARU?
Yes, in terms of function and footprint. Because both parts share the same die, package, and pinout, the AD8304ARUZ can serve as a drop-in replacement for the AD8304ARU. The substitution should still be validated against the specific design's compliance and procurement requirements.