Broadcom Limited AFBR-5705PZ

Overview

AFBR-5705PZ from Broadcom (formerly Avago) is a hot-pluggable, SFP-form-factor optical transceiver with Digital Diagnostic Monitoring Interface (DDMI), compliant with IEEE 802.3 1000BASE-SX and Fibre Channel FC-PI 100-M5-SN-I/100-M6-SN-I standards. It features an 850 nm VCSEL transmitter, LC-duplex connector, +3.3 V supply, and operates across -10°C to +85°C (Extended temperature range) with bail-style latching mechanism. It is deployed in Gigabit Ethernet switches and Fibre Channel storage interconnects.

For engineers reviewing the AFBR-5705PZ datasheet, pinout, applications, or equivalent options, key selection considerations include DDMI-enabled real-time monitoring (Tx power, Rx power, laser bias, temperature, Vcc), SFF-8472 Rev 9.3 compliance, SFP MSA mechanical compatibility, eye safety certification (Class 1), and extended-temperature operation with bail latch.

Technical Context

The AFBR-5705PZ implements a full SFP electrical interface per SFF-8074i and extends it with SFF-8472-compliant digital diagnostics via a 2-wire serial interface (I²C) at address A2h. Its transmitter uses an 850 nm VCSEL with integrated laser driver and eye safety circuitry that monitors optical output and asserts TX_FAULT on unsafe conditions.

The receiver employs a PIN photodiode ROSA with transimpedance preamplifier and quantization circuitry, delivering differential RD+/RD− outputs compliant with LVPECL/CML levels. LOS detection is provided both as a hardware open-collector signal (pin 8) and mirrored in EEPROM byte A2h[110][1], enabling host-level fault isolation and predictive failure analysis.

Key Specifications

Pinout & Package

AFBR-5705PZ uses the industry-standard SFP form factor (20-pin edge connector) with bail-latch mechanical design. The module is RoHS-6 compliant, constructed with metal housing and UL 94V-0 flame-retardant plastic, and qualified for hot-plug insertion in powered systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar optical transceiver applications.

Compared with AFBR-5705LZ, AFBR-5705PZ provides identical diagnostics and performance but replaces standard latch with bail latch for enhanced retention in high-vibration environments; compared with AFBR-5705APZ, it trades industrial temperature range for lower unit cost in controlled indoor deployments.

Availability

AFBR-5705PZ is available at Aetrix Electronics and suitable for enterprise switching, storage area networking, wireless infrastructure, and industrial control applications requiring stable component supply, long-term lifecycle support, and guaranteed DDMI functionality.

Supply support for AFBR-5705PZ 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

Broadcom Inc. (formerly Avago Technologies) is a global semiconductor leader specializing in wired and wireless communications infrastructure solutions, with deep expertise in optical interconnects and high-speed data transmission.

The AFBR-5705PZ belongs to Broadcom's AFBR-570xZ SFP transceiver product line, engineered specifically for cost-sensitive, high-port-density Gigabit Ethernet and Fibre Channel applications requiring digital diagnostics and extended-temperature reliability.

FAQ

What is the primary compliance standard for AFBR-5705PZ?

The AFBR-5705PZ complies with IEEE 802.3 (1000BASE-SX), Fibre Channel FC-PI (100-M5-SN-I/100-M6-SN-I), SFF-8074i (SFP MSA), and SFF-8472 Rev 9.3 (DDMI). It is also certified Class 1 eye-safe per FDA CDRH and IEC 60825-1. These standards ensure interoperability with standard networking equipment and regulatory acceptance in global markets. AFBR-5705PZ meets all mandatory electrical, optical, and mechanical requirements defined in these documents.

Does AFBR-5705PZ support real-time monitoring of laser bias current?

Yes, AFBR-5705PZ supports real-time monitoring of laser bias current via its Digital Diagnostic Monitoring Interface (DDMI). This parameter is calibrated and stored in the A2h memory page (address A2h, byte 110, bits 0–7 for LSB, byte 111 for MSB) per SFF-8472. Host systems can read this value over the 2-wire serial interface to detect early laser degradation trends. AFBR-5705PZ is the only variant in the AFBR-570xZ family with this capability enabled by default.

What is the maximum supported fiber distance for AFBR-5705PZ in Gigabit Ethernet mode?

In 1000BASE-SX Gigabit Ethernet mode, AFBR-5705PZ supports up to 550 meters over 50/125 µm multimode fiber (NA = 0.2) and up to 275 meters over 62.5/125 µm multimode fiber (NA = 0.275). These distances assume worst-case optical link budget margins and comply with IEEE 802.3 clause 38 specifications. AFBR-5705PZ achieves this using its 850 nm VCSEL transmitter with -9.5 to -3 dBm output power and -21 dBm receiver sensitivity.

How does the TX_DISABLE function operate on AFBR-5705PZ?

AFBR-5705PZ accepts a TTL/CMOS-compatible TX_DISABLE signal on pin 3: a logic high (≥2.0 V) or open circuit disables the laser, while a logic low (≤0.8 V) enables transmission. An internal 4.7–10 kΩ pull-up ensures safe default disable state. The function is also controllable via I²C (A2h, byte 110, bit 6), and hardware/software inputs are OR'd. AFBR-5705PZ requires ≥10 ms between successive TX_DISABLE assertions to avoid unintended resets.

Is AFBR-5705PZ compatible with SFP cages designed for standard (non-bail) latches?

No, AFBR-5705PZ uses a bail-latch mechanical interface and is not physically compatible with SFP cages designed exclusively for standard latches. Its latch geometry matches SFF-8431 bail-latch specifications. Attempting insertion into a standard-latch cage may cause damage or unreliable retention. For standard-latch systems, use AFBR-5705LZ instead. AFBR-5705PZ is mechanically and electrically identical to AFBR-5705LZ except for the latch type.