In-Depth Analysis of SN65HVD230DR: A Classic Choice for 3.3V CAN Bus Transceivers

In the field of CAN bus communication, Texas Instruments(TI)' SN65HVD230DR is a well‑proven 3.3V CAN transceiver. It is primarily designed to work with CAN‑capable TMS320Lx240x series DSPs. As microcontrollers and DSPs with 3.3V logic levels become increasingly popular, the value of this device continues to grow.

I. Key Parameters at a Glance

Parameter	Specification
Supply Voltage	3V ~ 3.6V (single 3.3V supply)
Maximum Data Rate	1 Mbps
Operating Current	17 mA (typical)
Standby Current	370 µA (typical)
Operating Temperature	-40°C ~ +85°C
Package	8‑pin SOIC (4.90mm × 3.91mm)
Bus Nodes	Up to 120 nodes
Bus ESD Protection	±16 kV (HBM)
Common‑Mode Voltage Range	-2V ~ 7V

II. Features and Operating Modes

The SN65HVD230DR complies with the ISO 11898‑2 high‑speed CAN physical layer standard and offers multiple protection features: thermal shutdown protection, open‑circuit fail‑safe, ±16kV bus ESD protection, and glitch‑free power‑up protection for hot‑plug applications.

Quick Pin Description (8‑pin SOIC package):

- Pin 1 (D) : CAN controller transmit data input
- Pin 2 (GND) : Ground
- Pin 3 (VCC) : 3.3V supply
- Pin 4 (R) : CAN bus receive data output
- Pin 5 (VREF) : Reference voltage output (VCC/2)
- Pin 6 (CANL) : CAN bus low‑side line
- Pin 7 (CANH) : CAN bus high‑side line
- Pin 8 (RS)** : Mode select / slope resistor input

III. Typical Applications

The SN65HVD230DR is widely used in industrial automation, control systems, sensors and drive systems, motor and robotics control, building and HVAC control, as well as telecom base station control. Its wide common‑mode operating range (-2V to 7V) and ±25V common‑mode transient tolerance make it particularly suitable for harsh industrial environments.

IV. Frequently Asked Questions

Q1: What are the differences between SN65HVD230DR, SN65HVD231DR, and SN65HVD232DR?

All three are 3.3V CAN transceivers. The main difference lies in power‑saving modes. The SN65HVD230 offers a low‑current standby mode (370 µA typical). The SN65HVD231 provides an ultra‑low‑current sleep mode (40 nA typical). The SN65HVD232 leaves the RS and VREF pins as no‑connect (NC) and does not support low‑power modes. Choose based on system power requirements.

Q2: What is the difference between the "DR" and "DG4" suffixes?

TI officially confirms that the materials are identical. "DR" stands for standard tape‑and‑reel packaging (2,500 pieces per reel), while "DG4" was an earlier green‑indicator version that has now been superseded by "DR."

Q3: How does the resistor value on the RS pin affect communication?

Connecting RS to GND enables high‑speed mode. Connecting a 10kΩ ~ 100kΩ resistor to GND enters slope‑control mode. A larger resistor value gives a slower rise/fall slope and lower EMI radiation, but also reduces the achievable communication speed.

V. Conclusion

With its single 3.3V supply, 1 Mbps data rate, flexible three‑mode operation, and comprehensive protection mechanisms, the SN65HVD230DR remains a classic choice for industrial CAN bus communication. Whether paired with TI's TMS320 series DSPs or 3.3V MCUs like STM32, it delivers stable and reliable physical‑layer connectivity.

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