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Texas Instruments SN65HVD256DR
- Part No.:
- SN65HVD256DR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN65HVD256DR.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,728
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Product details
Overview
SN65HVD256DR from Texas Instruments is a 5-V ISO 11898-2 High-Speed CAN transceiver with RXD output level-shifting capability, 1-Mbps data rate support, dominant time-out protection, and operation from –40°C to 125°C. It interfaces MCU CAN controllers to differential bus lines in industrial automation, building control, and telecom base station systems.
For engineers reviewing the SN65HVD256DR datasheet, SN65HVD256DR pinout, SN65HVD256DR application, or SN65HVD256DR equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, functional safety–relevant timing margins, and validated alternative transceivers for CANopen, DeviceNet, and NMEA2000 implementations.
Technical Context
The SN65HVD256DR implements Turbo CAN architecture with symmetrical propagation delays (tPROP(LOOP1)/tPROP(LOOP2) ≤ 150 ns), fast loop times, and short dominant/recessive transition skew (tsk(p) ≤ 10 ns). Its driver supports ±160 mA short-circuit current and differential output voltage ≥1.5 V under 45–65 Ω bus loads.
It features dual supply domains: VCC powers the transceiver core and driver, while VRXD (2.8–5.5 V) sets RXD logic-high level-enabling direct interfacing with 3.3-V MCUs without external level shifters. Undervoltage lockout on both supplies prevents erratic behavior during power ramp-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 1 Mbps - enables real-time control in highly loaded CAN networks down to 10 kbps using TXD dominant time-out. |
| Differential Output Voltage (dominant) | ≥1.5 V at 45–65 Ω load - ensures robust signal integrity across long cables and noisy industrial environments. |
| Loop Propagation Delay | ≤150 ns (recessive→dominant & dominant→recessive) - provides tight timing margin for high-speed arbitration and error detection. |
| RXD Level-Shifting Range | VRXD = 2.8–5.5 V - allows direct connection to 3.3-V or 5-V microcontrollers without external translators. |
| Bus Fault Protection | –27 V to +40 V on CANH/CANL - safeguards against load-dump transients and ESD events in automotive-grade deployments. |
| ESD Robustness | ±12 kV HBM on bus pins - exceeds IEC 61000-4-2 Level 4 requirements for system-level immunity. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood, motor drive, and industrial control cabinet applications. |
Pinout & Package
SN65HVD256DR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - TXD | Input | MCU CAN controller transmit signal; active-low dominant assertion triggers bus driver. |
| 2 - GND | Ground | Signal reference for all logic and bus circuitry; must be low-impedance connection to system ground plane. |
| 3 - VCC | Supply | 5-V main supply for transceiver core, driver, and receiver; requires local 100-nF ceramic decoupling. |
| 4 - RXD | Output | Receiver data output; logic level set by VRXD pin, not VCC - enables mixed-voltage system interoperability. |
| 5 - VRXD | Supply | Independent RXD output supply rail (2.8–5.5 V); isolates MCU I/O voltage domain from transceiver VCC. |
| 6 - CANL | I/O | Low-side CAN bus line; internally biased and protected against ±40 V faults and ESD. |
| 7 - CANH | I/O | High-side CAN bus line; differential pair partner to CANL; defines bus state with CANL. |
| 8 - S | Input | Silent mode select (active-high); disables driver output while preserving receiver functionality for bus monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Turbo CAN timing | Symmetrical propagation delays (≤150 ns) and fast loop times improve timing margin for 1-Mbps operation in large networks. |
| RXD level-shifting | VRXD-supplied output allows direct interface to 3.3-V MCUs without external level translators or voltage dividers. |
| TXD dominant time-out | 1175–3700 µs timeout prevents bus lockup due to MCU firmware faults or TXD pin stuck low. |
| Undervoltage lockout | UVVCC (3.5–4.45 V) and UVRXD (1.3–2.75 V) thresholds ensure glitch-free startup and shutdown behavior. |
| Passive bus behavior | High-impedance bus pins when unpowered (VCC = 0 V) prevent loading of live CAN networks during hot-swap or power sequencing. |
Applications
| Industrial Automation | Building Control Systems |
|---|---|
Use Scenario: Distributed PLC I/O modules communicating over CAN bus in factory-floor machinery. IC Role / Device Role / Timing Role: Physical layer transceiver translating MCU UART/CAN controller signals to differential bus levels with <150 ns loop delay. Use Value: Enables deterministic 1-Mbps messaging between motion controllers and servo drives despite cable lengths up to 40 m. |
Use Scenario: HVAC zone controllers and fire alarm panels sharing status and command data via CANopen network. IC Role / Device Role / Timing Role: Isolated bus node transceiver with VRXD level-shifting for 3.3-V ARM-based controllers interfacing to legacy 5-V CAN infrastructure. Use Value: Eliminates need for discrete level-shifters while maintaining ±12 kV HBM ESD protection on bus lines. |
| Telecom Base Stations | Marine Electronics (NMEA2000) |
Use Scenario: Remote radio unit (RRU) status monitoring and configuration over CAN bus in 5G base stations. IC Role / Device Role / Timing Role: Fault-tolerant transceiver with TXD DTO and undervoltage lockout ensuring reliable communication during brownout conditions. Use Value: Prevents bus lockup during power cycling and supports operation across –40°C to +125°C ambient range inside outdoor enclosures. |
Use Scenario: Multifunction displays and engine sensors exchanging navigation, depth, and engine data per NMEA2000 protocol. IC Role / Device Role / Timing Role: Ruggedized CAN physical layer device with –27 V to +40 V bus fault tolerance for marine electrical environments. Use Value: Survives alternator load-dump transients and salt-mist corrosion-prone installations without external TVS clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CAN transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65HVD255DR | No VRXD pin; RXD output referenced to VCC only (5 V fixed); no RXD level-shifting capability. | Requires 5-V MCU interface; unsuitable for 3.3-V controllers without external translation. | Select when system uses only 5-V logic and cost minimization is prioritized over voltage flexibility. |
| SN65HVD257DR | Adds FAULT open-drain output and RXD dominant time-out (tRXD_DTO = 1380–4200 µs); VRXD pin repurposed as FAULT. | Enables redundant topology monitoring and functional safety diagnostics per ISO 13849/IEC 61508. | Select when fault reporting, bus health monitoring, or SIL2-capable designs are required. |
Compared with SN65HVD255DR and SN65HVD257DR, the SN65HVD256DR uniquely balances voltage flexibility (VRXD level-shifting) and fault resilience (TXD DTO) without adding diagnostic overhead-making it optimal for mixed-voltage industrial nodes where simplicity and interoperability are critical.
Availability
SN65HVD256DR is available at Aetrix Electronics and suitable for industrial automation, building control systems, and telecom base station applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for SN65HVD256DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in industrial, automotive, and communications markets.
The SN65HVD25x product line was designed specifically for high-reliability CAN physical layer interfacing in harsh environments-emphasizing timing precision, fault resilience, and wide temperature operation.
FAQ
What is the purpose of the VRXD pin on the SN65HVD256DR?
The VRXD pin on the SN65HVD256DR sets the logic-high voltage level of the RXD output, supporting 2.8–5.5 V operation. This enables direct connection to 3.3-V microcontrollers without external level-shifting circuitry. Unlike SN65HVD255DR (RXD tied to VCC) or SN65HVD257DR (VRXD replaced by FAULT), the SN65HVD256DR retains dedicated VRXD functionality for mixed-voltage system design.
Does the SN65HVD256DR support silent mode, and how is it activated?
Yes, the SN65HVD256DR supports silent mode via the S pin (Pin 8), which is active-high. When S = VCC, the driver is disabled while the receiver remains fully operational-allowing bus monitoring without transmission. This feature is essential for diagnostic tools, bus analyzers, and nodes requiring passive listening capability. The SN65HVD256DR maintains full receiver functionality including dominant time-out protection during silent mode.
What is the minimum CAN bit rate supported by the SN65HVD256DR due to TXD dominant time-out?
The SN65HVD256DR's TXD dominant time-out (tTXD_DTO) ranges from 1175 µs to 3700 µs. Based on the CAN protocol's maximum 11 successive dominant bits, the minimum supported bit rate is 11 bits ÷ 1175 µs = 9.4 kbps. This ensures bus recovery from MCU lockups while remaining compatible with standard CANopen and DeviceNet low-speed modes.
How does the SN65HVD256DR handle undervoltage conditions on VCC and VRXD?
The SN65HVD256DR incorporates independent undervoltage lockout circuits: UVVCC triggers at 3.5–4.45 V (200 mV hysteresis) and UVRXD at 1.3–2.75 V (80 mV hysteresis). Both disable driver output and place RXD in high-impedance state until supplies stabilize-preventing metastability and bus contention during power-up/down sequences. This dual-supply monitoring is unique to the SN65HVD256DR within the family.
Is the SN65HVD256DR pin-compatible with other devices in the SN65HVD25x family?
Yes, the SN65HVD256DR shares identical SOIC-8 (D) package, pin count, and mechanical footprint with SN65HVD255DR and SN65HVD257DR. However, Pin 5 function differs: NC on SN65HVD255DR, VRXD on SN65HVD256DR, and FAULT on SN65HVD257DR. PCB layout can be reused across the family, but schematic connections to Pin 5 must be adapted per device function.
SN65HVD256DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- CANbus
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Half
- Receiver Hysteresis:
- 200 mV
- Data Rate:
- 1Mbps
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN65HVD256DR FAQ
1.How can I place an order for SN65HVD256DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65HVD256DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN65HVD256DR reliable?
The price and inventory of SN65HVD256DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65HVD256DR is usually 5 days.
3.What payment methods are accepted for SN65HVD256DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65HVD256DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65HVD256DR?
SN65HVD256DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65HVD256DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN65HVD256DR?
For technical support, including SN65HVD256DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65HVD256DR requirements.
6.How does Aetrix verify that SN65HVD256DR is sourced from the original manufacturer or authorized distributors?
All SN65HVD256DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN65HVD256DR meets industry standards.
7.What is the process for return or replacement of SN65HVD256DR?
All SN65HVD256DR units undergo pre-shipment inspection (PSI). If there is an issue with SN65HVD256DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN65HVD256DR part is unused and in its original packaging.
Return procedure for SN65HVD256DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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