PESD2CAN - CAN Bus ESD Protection Diode, 41V | Nexperia
MPN: PESD2CAN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.28 | $0.28 |
| 10 | $0.19 | $1.90 |
| 100 | $0.11 | $11.00 |
| 500 | $0.07 | $35.00 |
| 1,000 | $0.05 | $50.00 |
PESD2CAN Overview
A TVS (Transient Voltage Suppressor) diode array is a type of ESD protection device, part of the broader circuit-protection family within discrete semiconductors. It operates by clamping transient overvoltages to a safe level through low-impedance avalanche breakdown, diverting surge energy away from sensitive transceiver pins before damage can occur. In the system hierarchy, the PESD2CAN sits between the CAN bus physical layer and the CAN transceiver IC, acting as the first line of defense for the network interface.
Key features include bidirectional symmetrical clamping on both bus lines with a common ground reference, compliance with IEC 61000-4-2 (ESD immunity) and IEC 61000-4-4 (electrical fast transient) requirements, and an automotive-oriented design targeting AEC-Q101 qualified discrete construction. The low package capacitance preserves signal integrity on CAN buses at the classical 500 kbps data rate without significant edge degradation.
Technically, the device integrates two bidirectional avalanche diodes sharing a common cathode structure tied to ground, so each CAN line (CANH and CANL) is protected independently against positive and negative transients. This common-ground topology matches the symmetric differential signaling of CAN, ensuring common-mode transients are clamped on both lines simultaneously.
Typical applications include CAN bus line protection in body control modules, engine management ECUs, gateways, and industrial DeviceNet bus lines, as documented in the manufacturer datasheet. It fits wherever CAN transceivers such as those from NXP, TI, or Infineon require robust external bus pin protection.
When designing with this part, place it as close as possible to the connector side of the CANH/CANL lines, ahead of the transceiver, with a short, low-inductance ground return to maximize clamping effectiveness.
This page synthesizes verified distributor data, drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides, with pricing referenced as of 2026-10-20.
Drop-in alternatives for PESD2CAN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PESD2CAN (same form factor and footprint) — differing in Number of Protected Lines, Package, Peak Pulse Current (Ipp), Clamping Voltage.
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| Protection Type | Bidirectional TVS diode array for CAN bus |
| Number of Protected Lines | 2 |
| Reverse Standoff Voltage | 24 V |
| Clamping Voltage | 41 V |
| Peak Pulse Current (Ipp) | 5 A (8/20 us) |
| Package | SOT-23 (TO-236AB) |
| Mounting Type | Surface Mount |
| Polarity | Bidirectional |
| ESD Immunity Standard | IEC 61000-4-2 |
| EFT Immunity Standard | IEC 61000-4-4 |
| Target Application | Automotive CAN bus / DeviceNet |
| Ordering Code | PESD2CAN,215 (Tape & Reel) |
PESD2CAN Pin Configuration
| Pin 1 | I/O1 (CANH) — Protected line 1 - connect to CANH bus line |
| Pin 2 | GND — Common ground / cathode reference for both protection diodes |
| Pin 3 | I/O2 (CANL) — Protected line 2 - connect to CANL bus line |
Typical Applications
PESD2CAN is suitable for 6 applications: Automotive Body Control Module, Engine Management ECU, CAN Gateway Node, Industrial DeviceNet Bus Line, OBD-II Diagnostic Port Protection, Agricultural and Off-Highway Vehicle Networks.
Automotive Body Control Module
In a body control module (BCM), the PESD2CAN protects the CANH and CANL transceiver pins of the vehicle's body CAN segment, where harness routing through doors and lighting loads exposes nodes to load-dump, inductive switching, and ESD events from service connectors. Its 24 V reverse standoff matches the common-mode range of standard HS-CAN transceivers, so normal differential signaling up to 500 kbps passes untouched, while the 41 V clamp at 5 A (8/20 us) absorbs transients before they reach the transceiver silicon. Placement directly at the connector, with a short ground via to the module ground plane, minimizes the loop inductance that would otherwise lift the clamping voltage during fast 1 ns-class ESD edges specified in IEC 61000-4-2. Because both lines are protected in one SOT-23, differential symmetry is maintained, reducing common-mode radiation from the harness.
Recommended
Engine Management ECU
Engine control units sit in one of the harshest electrical environments of the vehicle, with the powertrain CAN bus exposed to crank transients, injector switching noise, and jump-start conditions up to 24 V. The PESD2CAN's 24 V standoff ensures the protection device does not conduct or leak during these legitimate overvoltage events, while the 41 V clamping level bounds the voltage the transceiver input stage ever sees. Meeting IEC 61000-4-4 (EFT, fast burst) immunity makes it appropriate for the repetitive fast-transient bursts typical of inductive actuator coupling. In this application the TVS works alongside the common-mode choke in the CAN physical-layer reference design: the choke attenuates continuous RF common-mode noise while the PESD2CAN handles the high-energy clamping, giving a two-stage defense that protects the transceiver without adding capacitance that would slow the bus edges.
Recommended
CAN Gateway Node
A CAN gateway interconnects multiple bus segments - powertrain, chassis, body, and infotainment - so every CAN port on the gateway PCB needs compact, repeatable bus protection. The PESD2CAN's 3-pin SOT-23 footprint occupies under 3 mm x 3 mm including pads per port, letting a multi-port gateway add protection to eight or more CAN channels without board-area penalties. Each channel benefits from the 5 A (8/20 us) surge rating, adequate for coupling-induced transients when multiple long harnesses share a common ground path. Because clamping is symmetric on CANH and CANL, the gateway preserves differential signaling fidelity needed for the 500 kbps backbone segments. For gateways that also carry CAN FD channels at 2-5 Mbps, verify capacitance budget or swap in the footprint-compatible PESD2CANFD24LT-Q variant on those specific ports.
Recommended
Industrial DeviceNet Bus Line
The ProTek and Nexperia datasheets explicitly target DeviceNet, the industrial fieldbus built on the CAN physical layer operating in 24 V industrial cabinets. Here the PESD2CAN shields device transceivers from ESD during connector mating, EFT bursts from contactors and motor starters, and surge coupled onto long trunk cables running through electrically noisy factory floors. Its IEC 61000-4-2 and IEC 61000-4-4 compliance maps directly onto the immunity tests DeviceNet and general industrial EMC standards require at the device port. The 24 V standoff tolerates industrial 24 V signaling environments, and the 41 V clamp keeps transceiver inputs within safe limits during a 5 A (8/20 us) surge. Mounting the device at the terminal-block side of the node, before the transceiver and any isolation barrier, ensures surge energy is diverted to chassis ground earliest in the signal path.
Recommended
OBD-II Diagnostic Port Protection
The OBD-II diagnostic connector is the most accessible CAN access point on a vehicle and is mated frequently with ungrounded, human-handled scan tools, making it a prime ESD entry point - exactly the coupling scenario IEC 61000-4-2 characterizes at up to +/-8 kV contact discharge. Placing a PESD2CAN across pins 6 (CANH) and 14 (CANL) referenced to pin 4/5 ground clamps discharge events before they reach the diagnostic gateway transceiver. The 24 V reverse standoff is intentionally above the 16 V battery maximum and tolerant of charger/booster misconnections, so the protector never conducts during normal operation. Its bidirectional nature handles both positive and negative ESD polarity, and the 41 V clamp level remains within the absolute maximum ratings of typical CAN transceivers, preventing latent damage that manifests later as intermittent diagnostic failures.
Recommended
Agricultural and Off-Highway Vehicle Networks
Tractors, harvesters, and construction equipment use CAN (often ISOBUS/J1939) with long harnesses traversing engine bays and implement connections that mate and unmate in dusty, field conditions. The PESD2CAN's 5 A (8/20 us) surge tolerance and 24 V standoff fit the 12 V and 24 V vehicle electrical architectures common in off-highway equipment, while its SOT-23 size suits the dense, sealed control boxes typical of implement ECUs. Transients from alternator load dump and solenoid switching arrive on the bus through coupling, and the device's IEC 61000-4-4 EFT immunity directly addresses those repetitive fast bursts. Because each SOT-23 protects both bus lines symmetrically, J1939 differential integrity is maintained for 250 kbps network communication. Its qualification-class construction supports the extended-temperature, vibration-heavy environment expected of agricultural electronics when combined with appropriate conformal coating.
Recommended
Recommended Products Summary
Engineering reference data for PESD2CAN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PESD1CAN | PESD2CANFD24LT-Q | ESDCAN24-2BLY | CDSOT23-T24CAN-Q | PAM2CAN |
|---|---|---|---|---|---|---|
| Package | SOT-23 (TO-236AB) | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same |
| Brand | Nexperia | Nexperia | Nexperia | STMicroelectronics | Bourns | ProTek Devices |
| Protected Lines | 2 (CANH + CANL) | 1 | 2 | 2 | 2 | 2 |
| Reverse Standoff Voltage | 24 V | 24 V | 24 V | 24 V | 24 V | 24 V |
| Target Bus Speed | Classical CAN up to 1 Mbps | Classical CAN | CAN FD (up to 5-8 Mbps data phase) | Classical CAN / CAN FD capable | Classical CAN | Classical CAN / DeviceNet |
| IEC 61000-4-2 / -4-4 Compliance | Yes (both) | Yes (both) | Yes | Yes | Yes | Yes (both) |
Key Differentiators
- Dual-line protection in one package (vs PESD1CAN)
- Purpose-built 24 V CAN standoff (vs CDSOT23-T24CAN-Q)
- CAN FD upgrade path without PCB change (vs PESD2CANFD24LT-Q)
Design Notes
Place the PESD2CAN within a few millimeters of the CAN connector, on the connector side of any common-mode choke, so surge current is shunted to ground before it couples into the choke or reaches the transceiver. Route the GND pin (pin 2) directly to the ground plane with at least two vias; a long thin ground trace adds series inductance (roughly 1 nH/mm), which raises the effective clamping voltage by L * di/dt during fast IEC 61000-4-2 edges and can negate the protection entirely.
Do not place the TVS behind series termination resistors if the resistors are only rated for low pulse energy - during a surge the full 5 A pulse current must flow through them, and typical 0402/0603 chip resistors may fail open before the TVS clamps. Also verify the transceiver's absolute maximum pin voltage exceeds the 41 V clamp level with margin; all standard HS-CAN transceivers (e.g., TJA1051-class) satisfy this, but low-voltage or fault-tolerant variants may not.
The junction capacitance of CAN-class TVS arrays (approximately 20-25 pF per line class) adds to the bus loading. On classical CAN at 500 kbps with up to 30 nodes, this is negligible, but on heavily loaded buses or CAN FD data phases at 2-8 Mbps the added capacitance shortens the usable stub length and reduces the maximum node count. For CAN FD ports, estimate the total per-node capacitance (transceiver + TVS + connector) and keep it within the physical-layer budget, or select the footprint-compatible PESD2CANFD24LT-Q.
Estimated: for an 8/20 us 5 A surge pulse, the energy delivered to the TVS is on the order of tens of millijoules; the SOT-23 die handles this single-event energy per datasheet ratings, but repetitive surges (EFT bursts per IEC 61000-4-4) thermally accumulate. Keep copper area on the I/O traces adequate for heat spreading and avoid placing the TVS adjacent to thermally sensitive components in sealed enclosures with limited convection.
Compliance Information
Automotive-targeted discrete from Nexperia (discrete TVS family normally qualified to AEC-Q101 rather than AEC-Q100). IEC 61000-4-2 and IEC 61000-4-4 immunity compliance is stated in datasheets. Explicit RoHS/REACH/lead-free declarations were not present in the verified web data - obtain current certificates from nexperia.com/product/pesd2can.
