TJA1086GHN/0Z - FlexRay Active Star Coupler 2 Branch | NXP
MPN: TJA1086GHN/0Z β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.1 | $81.00 |
| 100 | $7.25 | $725.00 |
| 500 | $6.6 | $3,300.00 |
| 1,000 | $5.9 | $5,900.00 |
TJA1086GHN/0Z Overview
An active star coupler is a network topology element used in automotive and industrial in-vehicle networks. Unlike a passive star, which simply splits the bus signal, an active star receives a frame on one branch, regenerates it, and re-transmits it to all other branches. This regeneration decouples electrical faults on one branch from the rest of the network, improving fault containment, signal integrity, and overall network robustness. In the hierarchy of in-vehicle networking ICs, the TJA1086G sits above simple bus line transceivers (such as FlexRay node transceivers) and belongs to the class of network interface and communication ICs.
Key features include full-duplex point-to-point branch links, TRXD0/TRXD1 receiver interfaces that allow several TJA1085G and TJA1086G devices to be cascaded to increase the number of branches in the network, and branch-related fault handling so a short or low-ohmic fault on one branch does not take down the whole star. The 44-HVQFN package with an exposed thermal pad provides low inductance and good thermal dissipation for the 9 x 9 mm footprint.
Technically, the device implements the analog front end and control logic needed to drive and receive FlexRay differential signals on each branch at 10 Mbit/s, with wake-up and sleep handling compatible with the FlexRay electrical physical layer. The /0Z ordering suffix identifies the standard grade and tape-and-reel delivery of this silicon. Moisture sensitivity level is MSL 1 with a 260 C peak reflow rating, simplifying SMT assembly.
Typical applications include chassis and body-domain FlexRay stars in passenger cars, gateway nodes aggregating multiple FlexRay branches, and safety-critical backbone networks where deterministic 10 Mbit/s communication with dual-channel redundancy is required.
When designing with this part, route each FlexRay branch as a matched differential pair and observe the bus termination guidelines of the FlexRay electrical physical layer specification; verify supply and enable pin configurations against the latest NXP datasheet before layout sign-off.
This page synthesizes distributor pricing references, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for TJA1086GHN/0Z β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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TJA1086GHN/0Z
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View Datasheet βTJA1085GHN
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TJA1086GHN/0Z Specifications
| Product Type | FlexRay active star coupler |
| Number of Branches | 2 |
| Network Standard | FlexRay electrical physical layer V3.0.1 / ISO 17458-4 |
| Data Rate | 10 Mbit/s |
| Cascade Interfaces | TRXD0 / TRXD1 |
| Package | 44-HVQFN (9 x 9 mm) |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 |
| Peak Reflow Temperature | 260 C |
| Time at Peak Reflow Temperature | 30 s |
| Terminal Finish (JESD-609) | e4 (Nickel Palladium Gold Silver) |
| Number of Receivers / Drivers | 1 / 1 |
| Protocols Supported | FlexRay |
TJA1086GHN/0Z 44-hvqfn (9 x 9 mm) Pin Configuration Guide
Pin configuration for TJA1086GHN/0Z (44-hvqfn (9 x 9 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TJA1086GHN/0Z.
Refer to the datasheet for full pin configuration.
Typical Applications
TJA1086GHN/0Z is suitable for 6 applications: Automotive FlexRay Backbone Networks, Chassis and Body Domain Star Topologies, Gateway Nodes with Multiple FlexRay Branches, Safety-Critical X-by-Wire Communication, Industrial and Test FlexRay Networks, Commercial Vehicle and Off-Highway Networks.
Automotive FlexRay Backbone Networks
The TJA1086GHN/0Z serves as the two-branch active star element in a vehicle FlexRay backbone, where deterministic 10 Mbit/s communication and branch fault isolation are mandatory. Because it complies with the FlexRay electrical physical layer V3.0.1 / ISO 17458-4, regenerated frames preserve the timing and signal quality requirements of the protocol across each branch. In a backbone role, a short or heavily attenuated branch does not bring down the entire network, a decisive advantage over passive bus wiring. The 44-HVQFN 9 x 9 mm package integrates the analog front ends for two branches in a single footprint, reducing BOM count versus discrete driver/receiver implementations, while the TRXD0/TRXD1 interfaces allow stacking additional couplers where more than two branches are required.
Recommended
Chassis and Body Domain Star Topologies
In chassis and body domains, ECUs are grouped on physical branches that terminate at a central star point. The TJA1086GHN/0Z regenerates FlexRay frames at 10 Mbit/s between these branch groups, keeping signal amplitude and symmetry within V3.0.1 limits even when branch wiring lengths differ substantially. Its active regeneration contains electrical faults to a single branch, so a damaged harness segment affects only the ECUs on that branch - a critical property for availability-focused body functions. Designers typically place the coupler near the central harness junction; the exposed-pad HVQFN provides the grounding and thermal path needed for continuous full-traffic operation, and MSL 1 simplifies high-volume reflow assembly at automotive Tier-1 production lines.
Recommended
Gateway Nodes with Multiple FlexRay Branches
Central gateways that bridge FlexRay to CAN, LIN, or Ethernet frequently terminate several FlexRay branches at one point. The TJA1086GHN/0Z provides two regenerated branches per device, and multiple devices connect through TRXD0/TRXD1 interfaces, per NXP, so a gateway can scale its star size with identical silicon. This uniformity eases qualification because all branch interfaces share one datasheet, one layout pattern, and one compliance story under ISO 17458-4. The 44-HVQFN 9 x 9 mm footprint keeps the gateway's FlexRay section compact; careful matched-pair routing from each branch pin to the connector preserves the 10 Mbit/s eye, and the e4 NiPdAu finish supports standard lead-free automotive assembly processes.
Recommended
Safety-Critical X-by-Wire Communication
X-by-wire systems (steer-by-wire, brake-by-wire) rely on FlexRay's deterministic, dual-channel communication, and the active star coupler is the recommended topology element for fault containment in these safety-related networks. The TJA1086GHN/0Z isolates a faulty branch at 10 Mbit/s without propagating the fault, supporting the redundancy concepts required by safety-oriented in-vehicle networks. Its compliance with FlexRay electrical physical layer V3.0.1 / ISO 17458-4 ensures consistent bus timing across all branches, which deterministic protocols depend on. Designers should implement the wake-up and fault-handling behavior described in the NXP datasheet and validate the star's fail-operation behavior at network level, since branch isolation strategy is a system-safety decision.
Recommended
Industrial and Test FlexRay Networks
Beyond road vehicles, FlexRay is used in industrial automation, robotics, and HIL test benches that emulate automotive networks. The TJA1086GHN/0Z lets test engineers create 10 Mbit/s star topologies that replicate the electrical behavior of a vehicle FlexRay plant, including branch fault injection, because its V3.0.1 / ISO 17458-4 compliance matches production ECUs. Its TRXD0/TRXD1 cascade capability allows bench setups with more than two branches using standard parts. The 44-HVQFN 9 x 9 mm package suits evaluation boards with controlled-impedance branch routing, and MSL 1 handling simplifies small-batch reflow work in lab environments. Verify termination resistor values against the FlexRay physical layer specification when building custom bench stars.
Recommended
Commercial Vehicle and Off-Highway Networks
Trucks, buses, and off-highway machines adopt FlexRay where deterministic high-speed communication is needed for advanced driveline and stability functions. The TJA1086GHN/0Z provides the branch fault isolation that long, harshly routed harnesses demand: one damaged segment does not silence the whole star. With 10 Mbit/s regeneration compliant to FlexRay V3.0.1 / ISO 17458-4, frames maintain protocol timing across physically separated chassis zones. The rugged 44-HVQFN 9 x 9 mm package with exposed pad supports the vibration and thermal environment of commercial vehicles when properly soldered to an adequate ground pour, and the e4 NiPdAu terminal finish is compatible with lead-free automotive assembly standards used by commercial-vehicle Tier-1 suppliers.
Recommended
Recommended Products Summary
Engineering reference data for TJA1086GHN/0Z β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TJA1086GHN/0Z (Rochester Electronics) | TJA1085GHN |
|---|---|---|---|
| Package | 44-HVQFN (9 x 9 mm) | 44-HVQFN (9 x 9 mm) - same | 44-HVQFN - same family package |
| Brand | NXP Semiconductors | NXP Semiconductors (second source) | NXP Semiconductors |
| Network Standard | FlexRay V3.0.1 / ISO 17458-4 | FlexRay V3.0.1 / ISO 17458-4 | FlexRay V3.0.1 / ISO 17458-4 |
| TRXD Cascade Interface | TRXD0 / TRXD1 | TRXD0 / TRXD1 | TRXD0 / TRXD1 |
| Data Rate | 10 Mbit/s | 10 Mbit/s | 10 Mbit/s |
Key Differentiators
- Two-branch active star in a single package (vs TJA1085GHN)
- FlexRay V3.0.1 / ISO 17458-4 compliance (vs Generic node transceivers (e.g., TJA1080))
- Second-source availability of identical silicon (vs TJA1086GHN/0Z via Rochester Electronics)
Design Notes
Route each FlexRay branch from the TJA1086GHN/0Z as a matched differential pair with controlled impedance per the FlexRay electrical physical layer V3.0.1 specification, and keep stub lengths to termination networks minimal. Solder the HVQFN exposed pad to a solid ground pour with an adequate via array - this pad is both the main ground return and thermal path for the 44-pin 9 x 9 mm package. Place decoupling capacitors within a few millimeters of the supply pins. Verify all 44 pin assignments against the NXP datasheet before layout release.
Because the TJA1086G regenerates frames at 10 Mbit/s, input and output branch networks should follow the termination values in the FlexRay electrical physical layer specification to keep eye diagrams within V3.0.1 masks. When cascading multiple couplers via TRXD0/TRXD1, keep these interface traces short and reference them to a continuous ground plane to avoid added skew that could erode protocol timing margin across the expanded star.
Do not treat the TJA1085GHN as a guaranteed drop-in without datasheet verification: while it belongs to the same FlexRay star-coupler family and shares the HVQFN housing, branch configuration and pinout details must be confirmed against the NXP datasheet. Also note that pricing for this specialized part varies widely (aggregator references from $0.55 to $64.20 per unit as of 2026-09-13), so secure allocation or a second source (Rochester Electronics) early in the program.
Compliance Information
e4 terminal finish (Nickel Palladium Gold Silver) per JESD-609 indicates lead-free plating, consistent with RoHS-style assembly; full RoHS/REACH declarations must be confirmed from NXP's official product page or certificate of conformance. AEC-Q100 qualification not stated in provided data.
