Part A
ADM232AARNZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1649 PCS
- Package
- SOIC-16
- Series
- Interface - Drivers, Receivers, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM232LJR is a functionally compatible replacement candidate for the ADM232AARNZ, sharing the same dual RS-232 driver/receiver architecture, SOIC-16 footprint, and 5 V supply rail. Designers should validate the lower data rate and reduced external capacitor requirements of the ADM232LJR against the specific timing and decoupling margins of the target design before substituting in production.
Function and Channel Count
High match
Package and Pinout
High match
Data Rate
Validation required
External Capacitor Configuration
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM232AARNZ | ADM232LJR | Why it matters |
|---|---|---|---|
| Number of Drivers/Receivers | 2/2 | 2/2 | Both are dual transceivers, so the channel count is functionally equivalent for RS-232 interfacing. |
| Data Rate | 200 kbps | 120 kbps | The maximum guaranteed data rate affects the highest baud rate the interface can reliably support. |
| Supply Voltage | 5 V | 5 V | Both operate from a single 5 V supply, so power rail requirements are compatible. |
| Operating Temperature Range | -40°C to +85°C | 0°C to +70°C | The industrial temperature range of the AARNZ version allows use in harsher environments than the commercial-grade LJR. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Identical package and footprint enable direct board-level substitution without layout changes. |
| Number of Pins | 16 | 16 | Matching pin count supports drop-in replacement in existing sockets. |
| Charge Pump / External Capacitors | Requires external charge pump capacitors | Requires external charge pump capacitors | Both need external capacitors for the internal charge pump, so the surrounding passive network is similar. |
| RoHS Compliance | RoHS compliant | RoHS compliant | Both meet RoHS requirements, satisfying environmental and regulatory constraints. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM232AARNZ | ADM232LJR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS232 | RS232 |
| Number of Drivers/Receivers | 2/2 | 2/2 |
| Duplex | Full | Full |
| Receiver Hysteresis | 400 mV | 650 mV |
| Data Rate | 200kbps | 120Kbps |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADM232AARNZ and ADM232LJR?
The ADM232AARNZ is a dual RS-232 line driver/receiver from Analog Devices in a 16-lead SOIC package, while the ADM232LJR is a similar dual RS-232 transceiver in a 16-lead SOIC package. The primary differences lie in their operating temperature ranges, supply voltage specifications, and data rate capabilities as documented in their respective datasheets.
Are the ADM232AARNZ and ADM232LJR pin-compatible?
Both devices are offered in 16-lead SOIC packages with standard RS-232 transceiver pinouts. However, designers should verify pin function assignments against the respective manufacturer datasheets before considering direct substitution, as internal architecture and external component requirements may differ.
What data rate do the ADM232AARNZ and ADM232LJR support?
The ADM232AARNZ supports data rates up to 200 kbps as specified in the Analog Devices datasheet. The ADM232LJR data rate specification should be confirmed from the manufacturer datasheet, as the "L" suffix typically denotes a low-power variant with specific rate limitations.
What is the operating temperature range for each device?
The ADM232AARNZ is specified for the industrial temperature range of -40°C to +85°C. The ADM232LJR temperature range should be verified from its datasheet, as the suffix coding may indicate a different grade or temperature specification.
Do both devices require external charge pump capacitors?
Yes, both the ADM232AARNZ and ADM232LJR are charge-pump-based RS-232 transceivers that require external capacitors for voltage conversion. The specific capacitor values and configuration should be taken from each device's respective datasheet, as requirements may vary between variants.
Can the ADM232LJR be used as a drop-in replacement for the ADM232AARNZ?
Direct substitution should only be attempted after comparing all critical parameters—supply voltage range, data rate, temperature grade, capacitor requirements, and pin functions—between the two datasheets. The differing suffix codes indicate variant specifications that may not be interchangeable in all applications.