1. The 4 Main Connector Families
Before choosing, understand what each connector was actually designed for — not what it has been repurposed to do:
- FAKRA (Rosenberger, 1990s): Designed for analog RF — GPS antennas, AM/FM radio, satellite radio. Coaxial, single channel, 6 GHz max. Repurposed for 100BASE-T1 Ethernet, now declining for that role.
- Mini FAKRA / HFM (Rosenberger, 2018): Designed for multi-camera digital links in ADAS. Up to 4 coaxial channels in one compact housing. Selected connector families rated up to 20 GHz; actual data rate depends on complete channel validation. The direct upgrade from standard FAKRA.
- HSD (Rosenberger, 2000s): Designed for LVDS camera + power in one connector. 4-pin star quad. Repurposed for automotive Ethernet but being replaced by purpose-built connectors. Some assemblies may support signal and power depending on pin assignment and customer drawing.
- H-MTD (Rosenberger, 2019): Designed from scratch for Multi-Gigabit automotive Ethernet. Single or dual differential pair, 10 Gbps (roadmap to 25 Gbps). The standard for zonal architecture backbones.
2. Decision Criteria
| Criterion | FAKRA | Mini FAKRA | HSD | H-MTD |
|---|---|---|---|---|
| Signal type | RF (coaxial) | RF / digital (coaxial) | Differential (4-pin) | Differential (2-4 pin) |
| Max bandwidth | 6 GHz (analog), 100 Mbps (ETH) | Selected variants up to 20 GHz; actual data rate depends on channel validation | Depends on pin assignment and customer drawing | Multi-Gigabit SPE platform; future bandwidth depends on exact series, cable, and OEM validation |
| Channels per conn. | 1 | 1 / 2 / 4 | 2 pairs (fixed) | 1 / 2 pairs |
| Power delivery | Phantom only (<100mA) | Phantom only | Some configurations support signal + power depending on pin assignment and customer drawing | Via PoDL (802.3bu, 50W) |
| Size (mating face) | ~14 mm | ~11 mm | ~12 mm | ~10 × 10 mm |
| Cost per channel | Cost varies by connector brand, sealing level, cable type, order quantity, and tooling status | |||
| Future-proof | No (ceiling reached) | Moderate (1 Gbps ceiling) | No (end of ETH roadmap) | High, depending on OEM platform and exact connector series |
| Best application | GPS, AM/FM, SDARS antennas | Multi-camera ADAS | LVDS camera (video+power) | Zonal backbone, AV compute |
3. FAKRA vs Mini FAKRA: When to Stay vs Migrate
Stay with FAKRA if:
- Application is analog RF (GPS, AM/FM, DAB, satellite radio, Bluetooth antenna)
- You have an existing vehicle platform and changing connectors requires re-validation
- Bandwidth is ≤ 100 Mbps and you need backward compatibility with legacy ECUs
Migrate to Mini FAKRA if:
- You have 2+ cameras in one physical zone (surround-view, stereo ADAS, multi-sensor cluster)
- You need >100 Mbps per camera (1080p+ uncompressed, or 1000BASE-T1 Ethernet)
- PCB real estate is constrained — one 4-channel Mini FAKRA replaces 4 FAKRA connectors
- You are designing for SOP 2028+ on a new vehicle platform
4. HSD vs H-MTD: Legacy LVDS or Future Ethernet
Stay with HSD if:
- Your camera requires power over the same cable — some HSD cable assemblies may support signal and power in the same connector, depending on the exact pin assignment and customer drawing
- You are on a legacy platform and cannot change the ECU connector footprint
- You are using FPD-Link III or GMSL SerDes with LVDS output (not Ethernet)
Migrate to H-MTD if:
- You need higher bandwidth per link than HSD can support
- You are designing for a platform that specifies H-MTD or another OEM-approved SPE connector
- You need a modular connector platform supporting multiple protocols (Ethernet, USB, LVDS)
- Your project specifies H-MTD, MATEnet, NETBridge, GEMnet, or another SPE connector as the platform standard
SPE Connector Quick Reference
| Connector | Supplier | Max Data Rate | Key OEM Adoption | Best For |
|---|---|---|---|---|
| H-MTD | Rosenberger | 10 Gbps (roadmap 25G) | BMW, Mercedes | ADAS backbone, Multi-Gig Ethernet |
| MATEnet | TE Connectivity | 1 Gbps (roadmap 10G) | Per OEM platform | 100/1000BASE-T1 sensor and gateway links |
| NETBridge | Amphenol | 1 Gbps (NETBridge+ upgrade path to Multi-Gigabit) | VW Group, Ford | Modular Ethernet backbone (2-4 pairs) |
| GEMnet | TE Connectivity | Up to 56 Gbps / 15 GHz | Per OEM platform | Multi-Gigabit Ethernet, SerDes, camera |
5. Selection Decision Tree
Walk through this decision flow to identify your connector:
Automotive connector selection decision tree — answer 4 questions to find your connector
6. Cost Comparison: Per-Unit and System Level
| Scenario | FAKRA | Mini FAKRA | HSD | H-MTD |
|---|---|---|---|---|
| 1 camera (data only) | $1-3 (1 conn.) | $1-2 (1-ch) | $2-4 (1 conn.) | $3-5 (1-pair) |
| 4 cameras (surround) | $4-12 (4 conn.) | $3-6 (1× 4-ch) | $8-16 (4 conn.) | $12-20 (4× 1-pair) |
| Zonal backbone (2 links) | N/A (bandwidth) | N/A (bandwidth) | $4-8 (2 conn.) | $6-10 (1× 2-pair) |
| GPS + 4G + Wi-Fi + BT | $2-6 (4 conn.) | $3-6 (1× 4-ch) | N/A (RF) | N/A (not for RF) |
System-level cost comparison — 4-camera surround view shows Mini FAKRA's advantage
7. OEM Adoption Trends 2024-2030
| Connector | 2024 | 2026 | 2028 | 2030 |
|---|---|---|---|---|
| FAKRA | ▮▮▮▮▮ High | ▮▮▮▮ Medium | ▮▮▮ Medium | ▮▮ Low (RF only) |
| Mini FAKRA | ▮▮▮ Medium | ▮▮▮▮ High | ▮▮▮▮▮ Very High | ▮▮▮▮▮ Dominant (cameras) |
| HSD | ▮▮▮▮ High | ▮▮▮ Medium | ▮▮ Low | ▮ Legacy only |
| H-MTD | ▮▮ Low | ▮▮▮▮ High | ▮▮▮▮▮ Very High | ▮▮▮▮▮ Dominant (ETH) |
| MATEnet | ▮▮ Low | ▮▮▮ Medium | ▮▮▮ Medium | ▮▮▮▮ Per platform |
Frequently Asked Questions
Q: Which connector has the highest bandwidth?
A: For automotive Ethernet, H-MTD and GEMnet support Multi-Gigabit data rates. H-MTD supports up to 10 Gbps with a 25 Gbps roadmap; GEMnet (TE Connectivity) supports up to 56 Gbps / 15 GHz. NETBridge (Amphenol) currently supports up to 1 Gbps; the NETBridge+ upgrade path targets Multi-Gigabit. MATEnet currently supports up to 1 Gbps (up to 4 Gbps with alternative technology). FAKRA is limited to 100 Mbps for Ethernet. Mini FAKRA supports up to 1 Gbps per channel (coax, SerDes).
Q: Which is cheapest for high volume?
A: At system level, Mini FAKRA wins for multi-camera applications — one 4-channel connector replaces 4 individual connectors. FAKRA is cheapest per-unit but limited to 100 Mbps.
Q: Can I mix connectors in one harness?
A: Yes. A modern vehicle typically uses multiple connector families: FAKRA for RF, Mini FAKRA for cameras, H-MTD for Ethernet backbone, IX Industrial for diagnostics. Choose per application.
Q: Which is most future-proof?
A: For new Ethernet designs, H-MTD (10 Gbps, roadmap 25G) offers the highest bandwidth headroom. For multi-camera clusters, Mini FAKRA/HFM provides a compact, cost-effective solution. Avoid new HSD designs for Ethernet — it is a legacy platform. FAKRA remains appropriate for RF-only applications (GPS, radio).
Q: What are the OEM trends?
A: The industry is moving toward miniaturized multi-channel coax (Mini FAKRA/HFM) for camera clusters and modular SPE connectors (H-MTD, MATEnet, NETBridge, GEMnet) for Ethernet backbones. BMW and Mercedes favor H-MTD; VW Group and Ford use NETBridge; GM, Volvo, and Geely use GEMnet.
Need Help Choosing the Right Connector?
Our application engineers can review your system requirements and recommend the optimal connector and cable assembly — at no cost. We support FAKRA, Mini FAKRA, HSD, H-MTD, and MATEnet.
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