Part A
AD7740KRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3022 個数
- Package
- TSSOP-8
- Series
- PMIC - V-FおよびF-Vコンバータ
Replacement verdict
Compatible functional replacement candidate
The AD7740KRMZ and AD7740KRM-REEL7 are functionally equivalent implementations of the same synchronous voltage-to-frequency converter, differing only in packaging format and ordering quantity. Both parts share identical die, electrical specifications, and pinout, making them interchangeable in circuit design. The primary distinction is the delivery format: the KRMZ is supplied in tube/rail packaging while the KRM-REEL7 is supplied on a 7-inch tape-and-reel for automated assembly. Designers should confirm the packaging format aligns with their manufacturing process, but no electrical or functional redesign is required.
Function and Die
High match
Electrical Specifications
High match
Package Type
High match
Packaging Format
Validation required
Parts at a glance
Part B
AD7740KRM-REEL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7763 個数
- Package
- TSSOP-8
- Series
- PMIC - V-FおよびF-Vコンバータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7740KRMZ | AD7740KRM-REEL7 | Why it matters |
|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Same manufacturer ensures identical silicon design and process, critical for functional substitutability. |
| Function / Type | Voltage-to-Frequency Converter (VFC), synchronous | Voltage-to-Frequency Converter (VFC), synchronous | Identical device function confirms the parts are interchangeable in the same circuit role. |
| Package / Case | 8-TSSOP / MSOP | 8-TSSOP / MSOP | Same package and footprint allow drop-in replacement on an existing PCB. |
| Supply Voltage Range | 3.0 V to 5.25 V (single supply) | 3.0 V to 5.25 V (single supply) | Matching supply range ensures compatibility with the same power rail design. |
| Output Frequency Range | Up to 500 kHz | Up to 500 kHz | Same output frequency capability preserves the timing and resolution of the measurement system. |
| Linearity | ±0.012% typical | ±0.012% typical | Identical linearity spec ensures the same measurement accuracy in the application. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature rating confirms suitability for the same environmental conditions. |
| Packaging / Ordering Format | Tube / cut tape (Z = RoHS-compliant) | Tape and reel (7-inch reel) | Different packaging affects assembly line handling and RoHS status; the Z suffix denotes lead-free/RoHS compliance while the reel version is intended for automated pick-and-place. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7740KRMZ | AD7740KRM-REEL7 |
|---|---|---|
| Part Status | Active | Obsolete |
| Type | Voltage to Frequency | Voltage to Frequency |
| Frequency - Max | 1 MHz | 1 MHz |
| Full Scale | ±50ppm/°C | ±50ppm/°C |
| Linearity | ±0.012% | ±0.012% |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between AD7740KRMZ and AD7740KRM-REEL7?
Both are the same AD7740 voltage-to-frequency converter die in an 8-lead MSOP package. The AD7740KRMZ is supplied in tube/rail packaging and is RoHS-compliant (Z suffix). The AD7740KRM-REEL7 is the same device supplied on a 7-inch tape-and-reel for automated assembly and is the non-RoHS version. The core electrical specifications are identical; the differences are packaging format and RoHS compliance.
Are AD7740KRMZ and AD7740KRM-REEL7 electrically interchangeable?
Yes. Both parts share the same AD7740 functional core, the same 8-lead MSOP pinout, and the same specified performance for the voltage-to-frequency conversion, clock generation, and buffered input. They differ only in delivery packaging and RoHS status, so they are electrically interchangeable in a given design.
What is the function of the AD7740?
The AD7740 is a synchronous voltage-to-frequency converter (VFC) that produces an output frequency proportional to an input voltage. It integrates a buffered input, an on-chip clock oscillator, and a synchronous detection architecture, and is intended for isolated or low-cost analog-to-digital conversion, signal isolation, and frequency-based measurement applications.
What package do AD7740KRMZ and AD7740KRM-REEL7 use?
Both devices are offered in an 8-lead MSOP (Mini Small Outline Package). The package and pinout are identical between the two orderable part numbers, so PCB land patterns and footprint designs are the same.
Does the "Z" suffix on AD7740KRMZ indicate RoHS compliance?
Yes. In Analog Devices nomenclature, the "Z" suffix denotes a RoHS-compliant, lead-free package. The AD7740KRM-REEL7 does not carry the Z suffix and is the non-RoHS version. Designers with RoHS-restricted assemblies should select the AD7740KRMZ.
Why would a designer choose AD7740KRM-REEL7 instead of AD7740KRMZ?
The AD7740KRM-REEL7 is supplied on 7-inch tape-and-reel, which suits high-volume automated pick-and-place assembly. It is also the non-RoHS variant, so it may be selected for legacy assemblies that are not subject to RoHS restrictions. For new RoHS-compliant designs, the AD7740KRMZ is the appropriate choice.
Can AD7740KRMZ and AD7740KRM-REEL7 be mixed on the same PCB assembly?
Electrically and mechanically they are interchangeable, so mixing is possible from a functional standpoint. However, mixing RoHS-compliant and non-RoHS parts on a single assembly can complicate compliance documentation and soldering process control. For RoHS-declared products, use only the AD7740KRMZ.
Do both part numbers share the same operating temperature range and supply requirements?
Yes. Both are the same AD7740 device and therefore share the same specified operating temperature range and supply voltage requirements as documented in the AD7740 datasheet. Packaging format and RoHS status do not alter these electrical and environmental specifications.