Part A
AD8421BRZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 1263 PCS
- Package
- SOIC-8
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Replacement verdict
Compatible functional replacement candidate
The AD8421BRZ and AD8421BRZ-RL are functionally identical, differing only in packaging format. The AD8421BRZ is supplied in a tube, while the AD8421BRZ-RL is supplied in tape-and-reel for automated assembly. Both share the same die, grade, and specifications, making them fully interchangeable for design and performance purposes; selection should be driven solely by the required packaging and assembly method.
Amplifier Type and Function
High match
Package and Pinout
High match
Electrical Specifications
High match
Packaging Format
High match
Parts at a glance
Part B
AD8421BRZ-RL
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 9374 PCS
- Package
- SOIC-8
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8421BRZ | AD8421BRZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Instrumentation Amplifier | Instrumentation Amplifier | Confirms both parts are the same functional device type, ensuring direct substitutability in signal-conditioning circuits. |
| Number of Channels | 1 | 1 | Channel count must match for the parts to be interchangeable in single-channel instrumentation designs. |
| Gain Bandwidth Product | 10 MHz | 10 MHz | Determines the maximum frequency the amplifier can handle at a given gain; identical bandwidth ensures equivalent AC performance. |
| Input Offset Voltage (Max) | 60 µV | 60 µV | Low offset voltage is critical for precision DC measurements; matching values ensure equivalent accuracy. |
| Input Bias Current (Max) | 1 nA | 1 nA | Bias current affects error in high-impedance sensor interfaces; identical values preserve the same error budget. |
| Common Mode Rejection Ratio (CMRR) | 94 dB | 94 dB | CMRR determines rejection of common-mode noise; matching values ensure equivalent noise immunity in the application. |
| Supply Voltage Range | ±2.25 V to ±18 V | ±2.25 V to ±18 V | Supply range must match to ensure the part operates correctly in the target system's power rails. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must be compatible with the application environment for reliable operation. |
| Package / Mounting Type | 8-SOIC (Tube) | 8-SOIC (Tape & Reel) | Packaging differs (tube vs. tape-and-reel), which affects assembly line handling and pick-and-place automation, though the electrical part is identical. |
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 | AD8421BRZ | AD8421BRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Slew Rate | 35V/µs | 35V/µs |
| -3 dB Bandwidth | 10 MHz | 10 MHz |
| Current - Input Bias | 100 pA | 100 pA |
| Voltage - Input Offset | 25 µV | 25 µV |
| Supply Current | 2mA | 2mA |
| Current - Output / Channel | 65 mA | 65 mA |
| Voltage - Supply Span(Min) | 5 V | 5 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the AD8421BRZ and the AD8421BRZ-RL?
The AD8421BRZ and AD8421BRZ-RL are the same AD8421 instrumentation amplifier die in the same 8-lead SOIC package (R-8) with the same B-grade specifications. The difference is packaging format: AD8421BRZ is supplied in standard tube packaging, while the -RL suffix denotes tape-and-reel packaging for automated assembly. Electrical performance is identical between the two orderable part numbers.
Are the AD8421BRZ and AD8421BRZ-RL electrically and functionally interchangeable?
Yes. Both part numbers share the same datasheet specifications for the AD8421 B grade, including gain range of 1 to 10,000, CMRR, gain error, offset voltage, gain drift, and bandwidth. Because the die and package are identical, they are functionally interchangeable; only the shipping container differs.
What are the key specifications of the AD8421 B grade?
The AD8421B is a low-power, low-noise instrumentation amplifier with a typical input voltage noise of 3 nV/√Hz at 1 kHz, typical CMRR of 94 dB (G = 1) to 114 dB (G = 1000), typical gain error of 0.01% at G = 1, and typical input offset voltage of 25 µV. It operates on supplies from ±2.5 V to ±18 V (5 V to 36 V total) with a typical quiescent current of 2.3 mA and is specified over the −40°C to +85°C temperature range.
Which package do the AD8421BRZ and AD8421BRZ-RL use?
Both parts are offered in the 8-lead SOIC package (R-8 suffix), with an operating temperature range of −40°C to +85°C. The package and pinout are identical, so PCB land patterns and footprint designs apply equally to both orderable part numbers.
When should I choose the AD8421BRZ-RL instead of the AD8421BRZ?
Choose the AD8421BRZ-RL when your manufacturing line uses automated pick-and-place equipment that requires tape-and-reel feed. Choose the AD8421BRZ (tube) for manual assembly, prototyping, or low-volume builds where tube packaging is more convenient. The choice is purely a packaging/logistics decision, not an electrical one.
Can the AD8421BRZ and AD8421BRZ-RL be used in the same design without requalification?
Yes, from an electrical and mechanical standpoint, since both are the same B-grade device in the same 8-lead SOIC package. Any requalification would only concern the assembly process handling (tape-and-reel vs. tube), not the device performance or footprint.
What is the gain-setting configuration for the AD8421BRZ and AD8421BRZ-RL?
Both parts use a single external resistor RG connected between the RG pins to set gain according to G = 1 + (9.9 kΩ / RG). With RG open, the gain is 1; gains up to 10,000 are achievable. The gain-setting behavior is identical for both orderable part numbers.