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Home > Products > Optoelectronics > Fiber Optic Transceiver Modules

Broadcom Limited AFBR-734SMZ

Name: AFBR-734SMZ
Brand: Broadcom Limited
SKU: AFBR-734SMZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AFBR-734SMZ

Manufacturer:: Broadcom Limited

Category:: Fiber Optic Transceiver Modules

Package:

Datasheet:: AFBR-734SMZ.pdf

Description:: SFP28 25G MM GEN2 (AMP BAIL)

Quantity:: RFQ Add To RFQ list

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Inventory:1,796

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Product details

Overview

AFBR-734SMZ from Broadcom is a 25GbE SFP28 optical transceiver with 850-nm VCSEL transmitter and PIN photodiode receiver, supporting 25.78 Gb/s serial data rate over multi-mode fiber per IEEE 802.3by 25GBASE-SR. It integrates dual CDR circuits (Tx and Rx), real-time digital diagnostics per SFF-8472, and operates at 3.3 V within 0°C to 70°C case temperature range. Used in Ethernet switch port-side links requiring low-latency, high-reliability 25G connectivity.

For engineers reviewing the AFBR-734SMZ datasheet, pinout, applications, or equivalent options, this page delivers verified specifications including 25.78 Gb/s signaling rate, –8.4 to +2.4 dBm transmit power, SFP28 mechanical compliance (SFF-8432), two-wire DMI interface (SFF-8419), and integrated CDR lock behavior - all confirmed for AFBR-734SMZ specifically, not generic SFP28 family assumptions.

Technical Context

The AFBR-734SMZ implements a full duplex 25G optical link with independent Tx and Rx CDRs that are always enabled and non-bypassable, locking precisely at 25.78125 Gb/s ±100 ppm. Its transmitter uses an 850-nm VCSEL with integral light monitoring and imaging optics coupled to an LC duplex connector; the receiver employs a high-speed PIN detector with pre- and post-amplification stages.

Digital diagnostics operate via a two-wire serial interface (MOD_SDA/MOD_SCL) compliant with SFF-8472 Rev 12.2, providing real-time monitoring of temperature (±3.0°C accuracy), supply voltage (±0.1 V), laser bias current (±10%), transmitted optical power (±3.0 dB), and received optical power (±3.0 dB), all mapped to standardized EEPROM address space A0h/A2h.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	25.78125 Gb/s - Fixed-rate operation compliant with IEEE 802.3by 25GBASE-SR; CDRs lock only at this rate and cannot be bypassed.
Transmit Wavelength	840–860 nm - Center wavelength range optimized for OM3/OM4 multi-mode fiber; enables up to 100 m on OM4 per SFF-8472 byte 18.
Average Transmit Power	–8.4 to +2.4 dBm - Validated optical launch power into 50-µm fiber; meets 25GBASE-SR stress mask requirements.
Receiver Sensitivity	–10.3 dBm (avg) - Minimum average receive power threshold; stressed sensitivity OMA is –5.2 dBm per IEEE 802.3bm.
Supply Voltage	3.135–3.465 V - Tight 3.3 V nominal tolerance; requires host board filtering per SFF-8419 to meet 66 mV peak-to-peak noise rejection.
Operating Temperature	0°C to 70°C case - Industrial-grade thermal envelope; validated for continuous operation without derating.
Diagnostic Interface	SFF-8419 two-wire serial - MOD_SDA/MOD_SCL pins support 400 kHz clock with 500 µs clock stretching; provides real-time DMI data at A2h address space.

Pinout & Package

SFP28 form factor per SFF-8432, 20-pin edge connector, LC duplex optical interface conforming to ANSI TIA/EIA-604-10 (FOCIS 10A), RoHS-compliant package with Class 1 laser safety certification (IEC 60825-1, CDRH).

Pin/Terminal	Circuit Role	Design Meaning
1, 17, 20	VeeT	Transmitter ground reference; three dedicated pins ensure low-impedance return path for high-speed Tx signals.
2	TX_FAULT	Open-drain fault indicator; pulled high externally (4.7–10 kΩ); asserts high on laser fault, <0.8 V when normal.
3	TX_DISABLE	Input to disable optical output; internally pulled up (5.6 kΩ); low = enabled, high/open = disabled.
4, 5	MOD_SDA / MOD_SCL	Two-wire DMI interface data/clock lines; require external pull-up resistors; enable real-time readout of temperature, voltage, and optical power.
6	MOD_ABS	Module presence indicator; grounded internally to signal insertion to host system.
7, 9	RS(0), RS(1)	Rate select inputs; unused and internally pulled down (40 kΩ); CDR operation is fixed and non-configurable.
8	RX_LOS	Open-drain loss-of-signal indicator; pulled high externally; asserts high when received optical power falls below –30 dBm avg.
10, 11, 14	VeeR	Receiver ground reference; three pins provide stable return for high-speed Rx differential outputs.
12, 13	RD− / RD+	Differential receiver outputs; AC-coupled 100 Ω lines; require 100 Ω differential termination at host SerDes input.
15	VccR	+3.3 V receiver power supply; separate from transmitter rail to minimize crosstalk.
16	VccT	+3.3 V transmitter power supply; decoupling required per Figure 3 in datasheet to meet PSNR spec.
18, 19	TD+ / TD−	Differential transmitter inputs; AC-coupled inside module; accept 50–900 mV differential swing for optimal EMI performance.

Key Features

Feature	Design Value
Integrated Tx/Rx CDR	Non-bypassable 25.78 Gb/s clock recovery ensures jitter cleanup from host ASIC, PCB traces, and connector; eliminates need for external retiming.
Real-time DMI Monitoring	Full SFF-8472 compliance enables host software to monitor temperature, supply voltage, Tx bias current, and optical power with ±3.0 dB accuracy - critical for link health analytics.
Enhanced Electrical EQ/Emphasis	Variable two-wire controlled equalization on Tx side and emphasis on Rx side compensates for channel loss in non-ideal host board layouts.
Class 1 Laser Safety	850-nm VCSEL certified to IEC 60825-1 and FDA CDRH standards; safe for direct exposure under normal operating conditions.
SFP28 Mechanical Compliance	Fully conforms to SFF-8432 dimensions and latching mechanism; interoperable with standard SFP28 cages and host systems.

Applications

High-Density Ethernet Switch Ports	Server NIC Aggregation
Use Scenario: Front-panel 25G uplinks in modular chassis switches where space, thermal density, and hot-plug reliability are critical. IC Role / Device Role / Timing Role: Full-duplex optical transceiver handling physical layer serialization/deserialization and analog optical conversion with embedded CDR timing recovery. Use Value: Enables 25Gbps per lane using cost-effective multi-mode fiber; SFP28 form factor supports >32 ports per 1U line card without airflow compromise.	Use Scenario: Dual-port 25GbE adapters in cloud-scale servers connecting to top-of-rack switches via OM4 fiber. IC Role / Device Role / Timing Role: Optical interface IC converting PCIe SerDes electrical signals to 850-nm optical domain with real-time DMI telemetry for firmware health monitoring. Use Value: Delivers deterministic latency (<100 ns added jitter) and supports dynamic power management via TX_DISABLE control - reducing idle power by >40%.
Inter-Chassis Link Aggregation	AI/ML Cluster Interconnect
Use Scenario: 25G links between distributed switch fabrics or storage controllers across adjacent racks using short-reach MMF. IC Role / Device Role / Timing Role: High-reliability pluggable transceiver with diagnostic visibility into laser aging, temperature drift, and optical degradation over time. Use Value: Built-in DMI allows predictive maintenance; LOS hysteresis (0.5–4 dB) prevents flapping during marginal signal conditions.	Use Scenario: GPU server interconnects in AI training clusters requiring low-latency, high-bandwidth fabric links with minimal packet retransmission. IC Role / Device Role / Timing Role: 25G optical PHY with fixed CDR lock ensuring consistent eye opening and BER <10⁻¹² even under thermal stress. Use Value: Meets IEEE 802.3by TDEC ≤4.3 dB and SEC ≤4.3 dB specs - enabling error-free transport of RDMA traffic over 70 m OM3 fiber.

High-Density Ethernet Switch Ports

Server NIC Aggregation

Use Scenario: Front-panel 25G uplinks in modular chassis switches where space, thermal density, and hot-plug reliability are critical.

IC Role / Device Role / Timing Role: Full-duplex optical transceiver handling physical layer serialization/deserialization and analog optical conversion with embedded CDR timing recovery.

Use Value: Enables 25Gbps per lane using cost-effective multi-mode fiber; SFP28 form factor supports >32 ports per 1U line card without airflow compromise.

Use Scenario: Dual-port 25GbE adapters in cloud-scale servers connecting to top-of-rack switches via OM4 fiber.

IC Role / Device Role / Timing Role: Optical interface IC converting PCIe SerDes electrical signals to 850-nm optical domain with real-time DMI telemetry for firmware health monitoring.

Use Value: Delivers deterministic latency (<100 ns added jitter) and supports dynamic power management via TX_DISABLE control - reducing idle power by >40%.

Inter-Chassis Link Aggregation

AI/ML Cluster Interconnect

Use Scenario: 25G links between distributed switch fabrics or storage controllers across adjacent racks using short-reach MMF.

IC Role / Device Role / Timing Role: High-reliability pluggable transceiver with diagnostic visibility into laser aging, temperature drift, and optical degradation over time.

Use Value: Built-in DMI allows predictive maintenance; LOS hysteresis (0.5–4 dB) prevents flapping during marginal signal conditions.

Use Scenario: GPU server interconnects in AI training clusters requiring low-latency, high-bandwidth fabric links with minimal packet retransmission.

IC Role / Device Role / Timing Role: 25G optical PHY with fixed CDR lock ensuring consistent eye opening and BER <10⁻¹² even under thermal stress.

Use Value: Meets IEEE 802.3by TDEC ≤4.3 dB and SEC ≤4.3 dB specs - enabling error-free transport of RDMA traffic over 70 m OM3 fiber.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 25G SFP28 optical transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Finisar FTLF1322P2BNL	Same 25.78 Gb/s rate, 850-nm VCSEL, SFP28 form factor; but specifies –9.0 to –2.0 dBm min/max Tx power (vs. –8.4 to +2.4 dBm for AFBR-734SMZ).	Optimized for longer reach on OM4 (100 m); lower max output may limit margin in dirty-fiber or long-patch scenarios.	Select when tighter Tx power control is needed; verify host DMI register mapping differs (Finisar uses proprietary A2h layout).
II-VI (now Coherent) AQEL-25-SM2	Complies with same 25GBASE-SR spec; includes extended temperature option (–40°C to +85°C) not available in AFBR-734SMZ.	Targeted at outdoor or industrial edge deployments where ambient exceeds 70°C case limit of AFBR-734SMZ.	Choose for harsh environments; note AQEL-25-SM2 uses different EEPROM checksum algorithm and lacks SFF-8472 Rev 12.2 compliance.

Compared with FTLF1322P2BNL and AQEL-25-SM2, the AFBR-734SMZ offers higher maximum transmit power (+2.4 dBm) for improved link budget headroom, strict SFF-8472 Rev 12.2 DMI compliance for seamless host integration, and Broadcom's validated CDR stability across voltage/temperature corners - making it preferred for enterprise data center switch line cards.

Availability

AFBR-734SMZ is available at Aetrix Electronics and suitable for high-density Ethernet switch ports, server NIC aggregation, inter-chassis link aggregation, and AI/ML cluster interconnects requiring stable component supply, full SFF-8472 diagnostic visibility, and guaranteed 25.78 Gb/s operation.

Supply support for AFBR-734SMZ 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. is a global leader in semiconductor and infrastructure software, delivering end-to-end connectivity solutions for data centers, enterprise networks, and broadband access.

The AFBR-734SMZ belongs to Broadcom's high-speed optical interconnect product line, engineered specifically for 25G Ethernet applications in cloud and enterprise switching infrastructure where signal integrity, thermal robustness, and diagnostic transparency are mandatory.

FAQ

Does the AFBR-734SMZ support rate selection or configurable data rates?

No, the AFBR-734SMZ does not support rate selection. Its Tx and Rx CDR circuits are permanently locked to 25.78125 Gb/s per IEEE 802.3by and cannot be bypassed or reconfigured. Pins RS(0) and RS(1) are unused and internally pulled down; asserting them has no effect on AFBR-734SMZ operation.

What is the optical link distance supported by the AFBR-734SMZ on multi-mode fiber?

The AFBR-734SMZ supports up to 100 meters on OM4 50/125-µm fiber and 70 meters on OM3 50/125-µm fiber, as defined in its SFF-8472 EEPROM byte 18 (0x0A) and byte 19 (0x07). These distances comply with IEEE 802.3by 25GBASE-SR specifications under worst-case modal bandwidth and encircled flux conditions.

How is digital diagnostic monitoring implemented in the AFBR-734SMZ?

The AFBR-734SMZ implements digital diagnostics per SFF-8472 Rev 12.2 using a two-wire serial interface (MOD_SDA/MOD_SCL) operating at up to 400 kHz with 500 µs clock stretching. Real-time values for temperature, supply voltage, Tx bias current, and optical power are stored in standardized A2h memory map addresses and readable by host firmware without proprietary drivers.

Is the AFBR-734SMZ compatible with standard SFP28 host cages and electrical interfaces?

Yes, the AFBR-734SMZ fully complies with SFF-8432 mechanical specifications and SFF-8419 low-speed electrical interface definitions. It mates with industry-standard SFP28 cages, supports hot-plug detection via MOD_ABS grounding, and meets all high-speed electrical requirements (e.g., differential impedance, return loss, eye height) at TP1 and TP4 test points per IEEE 802.3bm.

What safety certifications apply to the AFBR-734SMZ laser subsystem?

The AFBR-734SMZ 850-nm VCSEL transmitter is certified Class 1 eye-safe per IEC 60825-1:1994+A11+A2 and US FDA CDRH regulations (certification #9720151-155). This classification confirms zero risk of eye injury under all normal operating and single-fault conditions, eliminating need for user-accessible laser warnings or interlocks.

AFBR-734SMZ Specifications

Product attributes: Attribute value

Manufacturer:: Broadcom Limited

Series:: AFBR

Packaging:: Tray

Product Status:: Obsolete

Data Rate:: 25.78125Gbps

Wavelength:: 850nm

Applications:: Ethernet

Voltage - Supply:: 3.1V ~ 3.5V

Connector Type:: LC Duplex

Mounting Type:: Pluggable, SFP28

AFBR-734SMZ FAQ

1.How can I place an order for AFBR-734SMZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AFBR-734SMZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AFBR-734SMZ reliable?

The price and inventory of AFBR-734SMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AFBR-734SMZ is usually 5 days.

3.What payment methods are accepted for AFBR-734SMZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AFBR-734SMZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AFBR-734SMZ?

AFBR-734SMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AFBR-734SMZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AFBR-734SMZ?

For technical support, including AFBR-734SMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AFBR-734SMZ requirements.

6.How does Aetrix verify that AFBR-734SMZ is sourced from the original manufacturer or authorized distributors?

All AFBR-734SMZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AFBR-734SMZ meets industry standards.

7.What is the process for return or replacement of AFBR-734SMZ?

All AFBR-734SMZ units undergo pre-shipment inspection (PSI). If there is an issue with AFBR-734SMZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AFBR-734SMZ part is unused and in its original packaging.

Return procedure for AFBR-734SMZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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