Part A
ADG451BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3269 PCS
- Package
- SOIC-16
- Series
- Interface - Conmutadores analógicos, Multiplexers, Demultiplexeres
Replacement verdict
Compatible functional replacement candidate
The ADG451BRZ and ADG451BR are functionally equivalent quad SPST CMOS switches sharing identical on-resistance, channel count, and package footprint; the BRZ suffix denotes RoHS-compliant lead-free construction versus the standard BR version, making the BRZ a direct drop-in replacement candidate where lead-free compliance is required.
Switch Configuration
High match
On-Resistance
High match
Package Type
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
ADG451BR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5953 PCS
- Series
- Interface - Conmutadores analógicos, Multiplexers, Demultiplexeres
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG451BRZ | ADG451BR | Why it matters |
|---|---|---|---|
| Switch Configuration | SPST (Normally Closed, 4 independent switches) | SPST (Normally Closed, 4 independent switches) | Defines the switching topology; both are quad SPST normally-closed, so they are functionally interchangeable in circuit design. |
| On-Resistance (RON) | 4 Ω (typical) | 4 Ω (typical) | Lower on-resistance reduces signal attenuation and voltage drop; identical values mean equivalent signal integrity. |
| Supply Voltage Range | ±4.5 V to ±20 V dual supply, or +4.5 V to +40 V single supply | ±4.5 V to ±20 V dual supply, or +4.5 V to +40 V single supply | Determines compatibility with the system power rails; matching ranges ensure the parts can be used in the same supply environment. |
| Number of Channels | 4 | 4 | Channel count must match for direct board-level substitution; both provide four independent switches. |
| Switching Time (tON/tOFF) | tON 90 ns, tOFF 60 ns (typical) | tON 90 ns, tOFF 60 ns (typical) | Affects maximum switching frequency and timing accuracy; identical values preserve dynamic performance. |
| Package / Mounting | 16-Lead SOIC (R-16), Surface Mount | 16-Lead SOIC (R-16), Surface Mount | Package and footprint must match for drop-in replacement; both use the same 16-lead SOIC package. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C (industrial) | Temperature range affects reliability in harsh environments; both cover the industrial range, though grade markings may differ. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free (Z suffix) | Non-RoHS, contains lead (no Z suffix) | RoHS compliance is required for many markets and affects solderability and environmental compliance; the BRZ is lead-free while the BR is not. |
| Charge Injection | 20 pC (typical) | 20 pC (typical) | Charge injection causes glitches in sample-and-hold circuits; identical values ensure equivalent accuracy. |
| Off Isolation / Crosstalk | Off isolation -70 dB, crosstalk -90 dB (typical at 1 MHz) | Off isolation -70 dB, crosstalk -90 dB (typical at 1 MHz) | Determines signal leakage between channels; matching values preserve channel-to-channel isolation performance. |
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 | ADG451BRZ | ADG451BR |
|---|---|---|
| Part Status | Active | Obsolete |
| Switch Circuit | SPST - NC | SPST - NC |
| Multiplexer / Demultiplexer Circuit | 1:1 | 1:1 |
| Number of Circuits | 4 | 4 |
| On - State Resistance (Max) | - | 5Ohm |
| Channel - to - Channel Matching (ΔRon) | - | 100mOhm |
| Voltage - Supply, Single (V+) | 12V | 12V |
| Voltage - Supply, Dual (V±) | ±4.5V ~ 20V | ±4.5V ~ 20V |
| Switch Time (Ton, Toff) (Max) | - | 180ns, 140ns |
| Charge Injection | 20pC | 20pC |
| Channel Capacitance (CS(off), CD(off)) | - | 37pF, 37pF |
| Current - Leakage (IS(off)) (Max) | - | 500pA |
| Crosstalk | -90dB @ 1MHz | -90dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | - | ADG451 |
| On - State Resistance(Max) | 5Ohm | - |
| Channel - to - Channel Matching(ΔRon) | 100mOhm | - |
| Switch Time(Ton Toff)(Max) | 180ns, 140ns | - |
| Channel Capacitance(CS(off)CD(off)) | 37pF, 37pF | - |
| Current - Leakage(IS(off))(Max) | 500pA | - |
Frequently asked questions
What is the difference between ADG451BRZ and ADG451BR?
The ADG451BRZ and ADG451BR are functionally identical quad SPST CMOS analog switches. The suffix difference refers to packaging and temperature grade: the ADG451BRZ is supplied in a lead-free (Pb-free), RoHS-compliant 16-lead SOIC package, while the ADG451BR is the older leaded (non-RoHS) SOIC version. Both are specified over the industrial temperature range of −40°C to +85°C.
Are ADG451BRZ and ADG451BR pin-compatible?
Yes. Both devices use the same 16-lead SOIC (R-16) package with identical pin assignments, so they are pin-compatible and share the same PCB land pattern. The only difference is the lead finish and RoHS compliance status.
Can ADG451BRZ be used as a drop-in replacement for ADG451BR?
Yes, in most cases. Because the two parts share the same die, package outline, pinout, and electrical specifications, the ADG451BRZ can directly replace the ADG451BR on an existing PCB. The substitution is also favorable for RoHS compliance, since the BRZ is lead-free and RoHS-compliant while the BR is not.
What are the key electrical specifications of the ADG451?
The ADG451 is a quad single-pole single-throw (SPST) analog switch with low on-resistance (typically 45 Ω), low leakage current, and fast switching times (tON typically 90 ns, tOFF typically 70 ns). It operates from dual supplies of ±4.5 V to ±20 V or a single supply of +4.5 V to +40 V, and features TTL/CMOS-compatible logic inputs.
Is the ADG451BRZ RoHS compliant?
Yes. The "Z" suffix in ADG451BRZ denotes a lead-free, RoHS-compliant package finish, in accordance with the Analog Devices Pb-free/RoHS designation. The ADG451BR, by contrast, uses a leaded finish and is not RoHS compliant.
What is the operating temperature range for both parts?
Both the ADG451BRZ and ADG451BR are specified for the industrial temperature range of −40°C to +85°C. The "B" grade in both part numbers indicates this industrial temperature specification.
Are ADG451BRZ and ADG451BR still in production?
The ADG451BRZ is the current, active RoHS-compliant ordering option. The ADG451BR (leaded version) has been superseded by the BRZ variant for RoHS reasons and may be obsolete or available only as remaining stock. Designers should verify current lifecycle status with Analog Devices or an authorized distributor before specifying the BR version for new designs.