Physical Layer Interface (PHY)

Product Specifications

Technical details and manufacturing context for Physical Layer Interface (PHY)

Definition

The Physical Layer Interface (PHY) is a critical component within a Bus Interface Controller responsible for implementing the lowest layer (Layer 1) of the OSI model. It manages the direct electrical or optical connection to the transmission medium, performing essential functions such as signal modulation/demodulation, line coding, clock synchronization, signal amplification, and electrical-to-optical conversion (or vice versa). It serves as the bridge between the digital logic of the controller and the analog characteristics of the physical network or bus medium. The PHY receives parallel digital data from the Media Access Control (MAC) layer of the controller. It then serializes this data, applies the appropriate line coding (e.g., Manchester, 8B/10B, PAM4), and modulates it into electrical or optical signals suitable for transmission over the specific medium (e.g., copper cable, fiber optic). On reception, it performs the reverse process: it recovers the clock from the incoming signal, equalizes the signal to compensate for channel losses, demodulates it, decodes the line code, and deserializes the data back into parallel format for the MAC layer. Typical parameters include data rates from 10 to 1000 Mbps (IEEE 802.3), supply voltage of 3.3 V ±5%, operating temperature range of -40 to 85 °C (IEC 60068-2-14), ESD tolerance of ±8 kV (IEC 61000-4-2), input impedance of 100 Ω ±10% for twisted pair, output voltage swing of 1.0 to 2.0 V differential, jitter of ≤0.3 UI peak-to-peak, power consumption of 0.5 to 2.5 W, package type QFN-48 (JEDEC MS-026), and operating humidity of 10 to 90% RH non-condensing (IEC 60068-2-78). These values are directory references and must be verified for the specific model and application. The PHY is typically packaged in ceramic or plastic, with silicon for the integrated circuit and copper for bonding and traces. It is essential to confirm model-specific specifications and standards with the legal manufacturer or supplier before procurement or design.

Working Principle

The PHY receives parallel digital data from the Media Access Control (MAC) layer of the controller. It then serializes this data, applies the appropriate line coding (e.g., Manchester, 8B/10B, PAM4), and modulates it into electrical or optical signals suitable for transmission over the specific medium (e.g., copper cable, fiber optic). On reception, it performs the reverse process: it recovers the clock from the incoming signal, equalizes the signal to compensate for channel losses, demodulates it, decodes the line code, and deserializes the data back into parallel format for the MAC layer.

Common Materials

Silicon (for integrated circuit), Copper (for bonding and traces), Ceramic or plastic (for packaging)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Data Rate	10–1000 Mbps	Higher rates require better signal integrityIEEE 802.3
Supply Voltage	3.3 ±5% V	Exceeding range may damage IC
Operating Temperature	-40–85 °C	Outside range may cause timing failuresIEC 60068-2-14
ESD Tolerance	±8 kV	HBM modelIEC 61000-4-2
Input Impedance	100 ±10% Ω	For twisted pairIEEE 802.3
Output Voltage Swing	1.0–2.0 V	DifferentialIEEE 802.3
Jitter	≤0.3 UI	Peak-to-peakIEEE 802.3
Power Consumption	0.5–2.5 W	Depends on data rate
Package Type	QFN-48	Footprint 7×7 mmJEDEC MS-026
Operating Humidity	10–90 % RH	Non-condensingIEC 60068-2-78

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Serializer/Deserializer (SerDes)
Converts parallel data from the MAC to a high-speed serial stream for transmission, and vice-versa for reception.

Material: Silicon
Clock Data Recovery (CDR) Unit
Extracts the clock signal from the incoming data stream to synchronize the receiver.

Material: Silicon
Line Driver/Receiver
Amplifies the signal for transmission onto the medium and receives the weak incoming signal.

Material: Silicon with copper output stages
Encoder/Decoder
Applies and removes line coding (e.g., 8B/10B) for DC balance, clock recovery, and error detection.

Material: Silicon

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Bus Interface Controller

View system integration details

Manufacturers of Physical Layer Interface (PHY)

Manufacturer profiles associated with Physical Layer Interface (PHY).

Sourcing Physical Layer Interface (PHY) from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the role of a PHY in a bus interface controller?

The PHY implements the physical layer (Layer 1) of the OSI model, handling electrical signaling, encoding, and medium attachment. It converts digital data from the MAC layer into signals suitable for the transmission medium and vice versa.

What are typical data rates supported by a PHY?

According to the directory reference, the data rate range is 10 to 1000 Mbps, based on IEEE 802.3. However, the actual supported rates depend on the specific PHY model and must be confirmed with the manufacturer.

What standards are relevant for PHY verification?

Common standards include IEEE 802.3 for data rate and impedance, IEC 60068-2-14 for temperature, IEC 61000-4-2 for ESD, and JEDEC MS-026 for packaging. These are reference standards; compliance should be verified for the specific product.

How should I select a PHY for my application?

Consider the required data rate, supply voltage, operating temperature range, ESD tolerance, package type, and power consumption. Always verify these parameters with the legal manufacturer or supplier for the specific model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Physical Layer Interface (PHY)

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

voltage:	1.8V, 2.5V, 3.3V supply rails with ±10% tolerance
data rate:	10 Mbps to 10 Gbps depending on PHY type (Ethernet, USB, PCIe, etc.)
temperature:	-40°C to +85°C (industrial grade), -40°C to +125°C (automotive grade)
signal integrity:	BER < 10^-12, eye diagram compliance per relevant standard

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards