My Inquiry
My Account
Broadcom Limited AFCT-725SMZ
- Part No.:
- AFCT-725SMZ
- Manufacturer:
- Broadcom Limited
- Category:
- Fiber Optic Transceiver Modules
- Package:
- Datasheet:
-
AFCT-725SMZ.pdf
- Description:
- TXRX SFP28 25GE 1310NM
- Quantity:
- Payment:
- Shipping:
Inventory:1,266
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AFCT-725SMZ from Avago Technologies is a 25GBASE-LR SFP+ optical transceiver with 1310nm DFB laser, supporting 25.78 Gb/s serial data rate over single-mode fiber up to 10 km. It integrates dual CDRs on Tx and Rx paths, complies with SFF-8472 digital diagnostics, and operates within 0°C to 70°C ambient temperature. Used in Ethernet switch port-side links requiring high-reliability 25G long-reach connectivity.
For engineers reviewing the AFCT-725SMZ datasheet, pinout, applications, or equivalent options, key selection criteria include 25GBASE-LR compliance, real-time DMI monitoring (Tx/Rx power, bias current, temp, Vcc), LC duplex optical interface per FOCIS-10A, SFP+ mechanical form factor per SFF-8432, and dual-rate support (25.78/10.31 Gb/s) via RS(0)/RS(1) pins.
Technical Context
The AFCT-725SMZ implements independent Clock and Data Recovery circuits on both transmit and receive paths, locking precisely at 25.78125 Gb/s ±100 ppm for IEEE 802.3by 25GBASE-LR compliance. Its transmitter uses a 1310nm DFB laser with integral photodiode for optical power monitoring, while the receiver employs a high-speed PIN photodiode and post-amplifier with variable emphasis control.
Digital diagnostic monitoring follows SFF-8472 Rev 12.2 over a 2-wire SCL/SDA interface (SFF-8419), providing real-time readouts of internal temperature (±3°C accuracy), supply voltage (±0.1 V), laser bias current (±10%), transmitted optical power (±3 dB), and received optical power (±3 dB). Low-speed control signals include TX_DISABLE, TX_FAULT, RX_LOS, and dual RATE_SELECT inputs for bit-rate configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 25.78125 Gb/s ±100 ppm - ensures IEEE 802.3by 25GBASE-LR compliance and FEC-enabled operation |
| Wavelength | 1295–1325 nm - defines 1310nm DFB laser center band for low dispersion in SMF |
| Optical Reach | 10 km over single-mode fiber - meets 25GBASE-LR specification under standard link budget conditions |
| Launch Power | −7.0 to +2.0 dBm - enables robust signal integrity across worst-case channel loss |
| Receiver Sensitivity | −12.0 dBm OMA - specifies minimum detectable optical power at 1E−6 BER with FEC |
| Power Supply | +3.3 V ±5% - requires dual 3.3V rails (VccT/VccR) with ≤300 mA total current draw |
| Operating Temp | 0°C to 70°C case temperature - defines commercial-grade thermal envelope for switch chassis deployment |
| Diagnostic Interface | SFF-8472 over 2-wire SCL/SDA - enables host-side real-time monitoring of 5 critical parameters without additional hardware |
Pinout & Package
AFCT-725SMZ uses the industry-standard SFP+ mechanical package (SFF-8432), 14.5 mm × 8.5 mm × 8.5 mm, with LC duplex optical receptacle conforming to ANSI TIA/EIA-604-10 (FOCIS-10A). Electrical interface is 20-pin edge connector with gold-plated contacts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 17, 20 | Transmitter Ground (VeeT) | Provides dedicated return path for Tx circuitry; must be connected to host board ground plane |
| 2 | TX_FAULT output | Open-drain indicator asserted high on laser fault; requires 4.7k–10kΩ pull-up to 3.3V on host |
| 3 | TX_DISABLE input | Active-high disable for optical output; internally pulled up (6.8kΩ); low = enabled, high/open = disabled |
| 4 | MOD-DEF2 (SDA) | Two-wire serial data line for SFF-8472 diagnostics; host-pulled up (4.7k–10kΩ) |
| 5 | MOD-DEF1 (SCL) | Two-wire serial clock line; host-pulled up (4.7k–10kΩ); supports 400 kHz max clock rate |
| 6 | MOD-DEF0 | Module presence detection; grounded internally by transceiver to signal insertion |
| 7, 9 | RS(0), RS(1) | Rate select inputs: RS(0)=high/RS(1)=high configures 25.78 Gb/s mode per SFF-8074i |
| 8 | RX_LOS output | Open-drain loss-of-signal indicator; high = received power below −30 dBm OMA threshold |
| 10, 11, 14 | Receiver Ground (VeeR) | Dedicated return for Rx analog/digital circuitry; separate from VeeT to minimize crosstalk |
| 12–13 | RD−/RD+ | Differential receiver outputs; AC-coupled 100Ω lines; require 100Ω differential termination at SERDES |
| 15 | VccR | +3.3 V supply for receiver section; decoupling required per Figure 4 (22 µF + 0.1 µF) |
| 16 | VccT | +3.3 V supply for transmitter section; separate rail from VccR to isolate noise sources |
| 18–19 | TD+/TD− | Differential transmitter inputs; AC-coupled 100Ω lines; accept 50–900 mVpp differential swing |
Key Features
| Feature | Design Value |
|---|---|
| Dual integrated CDRs | Enables jitter cleanup on both Tx and Rx paths at 25.78 Gb/s, meeting IEEE 802.3by timing budgets without external retiming |
| Real-time DMI monitoring | Provides calibrated readings of Tx power, Rx power, laser bias current, temperature, and supply voltage via SFF-8472 interface |
| Variable EQ/emphasis | Allows host-level optimization of electrical waveform integrity through programmable Tx equalization and Rx emphasis settings |
| Class 1 laser safety | Complies with IEC 60825-1 and FDA CDRH requirements-no external safety interlocks needed in end equipment |
| Wide-temp diagnostics | Internal temperature sensor accurate to ±3°C across full 0°C–70°C operating range, enabling thermal derating decisions |
| 25G/10G dual-rate support | Hardware-selectable operation at 25.78 Gb/s or 10.3125 Gb/s using RS(0)/RS(1) pins, simplifying multi-generation system design |
Applications
| Enterprise Data Center Switching | High-Density Server Interconnect |
|---|---|
Use Scenario: 25G uplinks between top-of-rack (ToR) and leaf switches in spine-leaf fabric. IC Role / Device Role / Timing Role: Optical transceiver providing 25GBASE-LR physical layer interface with embedded CDR and DMI telemetry. Use Value: Enables 10 km reach over legacy single-mode infrastructure while delivering real-time link health metrics for automated fault isolation. | Use Scenario: NIC-to-switch connections in AI/ML training clusters requiring deterministic latency and high throughput. IC Role / Device Role / Timing Role: SFP+ pluggable module converting SERDES electrical signals to 1310nm optical signals with precise jitter control. Use Value: Dual CDR architecture ensures sub-1 UI jitter accumulation, preserving signal integrity across multi-lane 25G links. |
| Carrier-Grade Aggregation | Industrial Ethernet Backbone |
Use Scenario: Inter-chassis links between modular Ethernet chassis in metro access nodes. IC Role / Device Role / Timing Role: Long-reach optical interface supporting 25GE with SFF-8472 diagnostics for remote performance validation. Use Value: Real-time monitoring of Tx bias current and temperature allows predictive maintenance before laser degradation impacts uptime. | Use Scenario: Factory floor backbone connecting PLCs, HMIs, and vision systems over extended distances. IC Role / Device Role / Timing Role: Industrial-temperature-rated (0°C–70°C) optical transceiver with RoHS-compliant construction. Use Value: Wide operating temperature range and Class 1 laser safety certification meet EN 61000-6-2/6-4 EMC and IEC 62443 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 25GBASE-LR optical transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AFCT-725SMZL | Same optical specs but rated for extended temperature (−40°C to +85°C); higher power consumption (1.7 W vs. 1.5 W) | Required for outdoor or uncontrolled industrial environments where ambient exceeds 70°C | Select AFCT-725SMZL only when extended temperature operation is mandatory; otherwise AFCT-725SMZ offers lower cost and power |
| FTLX2571D3BCV | Fiberstore variant with identical 25GBASE-LR spec, same SFP+ form factor, and SFF-8472 DMI-but uses different DFB vendor and lacks Avago's CDR implementation details | Valid for drop-in replacement in non-critical links where full Avago qualification is not required | Use FTLX2571D3BCV for cost-sensitive deployments with validated interoperability; retain AFCT-725SMZ for Avago-specific firmware integration or CDR performance assurance |
Compared with AFCT-725SMZL, the AFCT-725SMZ trades extended temperature tolerance for lower power and cost, while FTLX2571D3BCV provides functional equivalence with third-party sourcing flexibility but less detailed CDR characterization and no Avago-specific diagnostic calibration traceability.
Availability
AFCT-725SMZ is available at Aetrix Electronics and suitable for enterprise switching, AI cluster interconnect, and carrier aggregation requiring stable component supply, full SFF-8472 diagnostic support, and guaranteed 25GBASE-LR compliance.
Supply support for AFCT-725SMZ 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
Avago Technologies (now part of Broadcom) is a global leader in semiconductor solutions for wired and wireless communications, specializing in high-speed optical interconnects and RF components.
The AFCT-725SMZ belongs to Avago's SFP+ 25G LR transceiver product line, engineered specifically for standards-compliant, high-reliability 25GbE links in data center and telecom infrastructure.
FAQ
What is the maximum supported fiber distance for AFCT-725SMZ?
The AFCT-725SMZ supports up to 10 km over standard single-mode fiber (G.652.D) when operating in 25GBASE-LR mode per IEEE 802.3by Clause 112. This distance assumes worst-case link budget conditions including connector loss, splice loss, and fiber attenuation of 0.4 dB/km. The transceiver's −7.0 dBm minimum launch power and −12.0 dBm OMA sensitivity establish this reach under FEC-enabled operation.
Does AFCT-725SMZ support 10GBASE-LR operation?
Yes, the AFCT-725SMZ supports 10.3125 Gb/s operation via hardware rate selection using the RS(0) and RS(1) pins. When RS(0) and RS(1) are both set low, the transceiver operates in 10GBASE-LR mode per IEEE 802.3 Clause 52. Both 10G and 25G modes share the same optical interface, diagnostics, and SFP+ mechanical form factor, enabling flexible multi-rate deployment.
How does the digital diagnostic monitoring (DMI) in AFCT-725SMZ work?
The AFCT-725SMZ implements SFF-8472 Rev 12.2 DMI over a 2-wire SCL/SDA interface (address A0h/A2h), providing real-time calibrated readings of internal temperature (±3°C), supply voltage (±0.1 V), laser bias current (±10%), transmitted optical power (±3 dB), and received optical power (±3 dB). Host systems access these values using standard I²C commands without requiring additional analog circuitry.
What are the power supply requirements for AFCT-725SMZ?
The AFCT-725SMZ requires two independent +3.3 V supplies: VccT (transmitter) and VccR (receiver), each regulated to 3.3 V ±5%. Total supply current is ≤300 mA, with peak in-rush current ≤30 mA above steady state after 500 ns. Recommended filtering per Figure 4 includes 4.7 µH inductors (≤1 Ω DCR), 22 µF bulk capacitors, and 0.1 µF ceramic caps placed near the SFP+ connector pins.
Is AFCT-725SMZ compliant with RoHS and laser safety standards?
Yes, the AFCT-725SMZ is RoHS-compliant (≤1000 ppm Cd, Pb, Hg, Cr⁶⁺, PBB, PBDE) and certified Class 1 eye-safe per IEC 60825-1:1994+A11+A2 and US FDA CDRH 21 CFR 1040.10/1040.11 (CDRH Certification #9521220-224). No external laser safety controls are required during normal operation.
AFCT-725SMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Broadcom Limited
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Data Rate:
- 25Gbps
- Wavelength:
- 1310nm
- Applications:
- General Purpose
- Voltage - Supply:
- 3.3V
- Connector Type:
- LC
- Mounting Type:
- Pluggable, SFP28
AFCT-725SMZ FAQ
1.How can I place an order for AFCT-725SMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AFCT-725SMZ 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 AFCT-725SMZ reliable?
The price and inventory of AFCT-725SMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AFCT-725SMZ is usually 5 days.
3.What payment methods are accepted for AFCT-725SMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AFCT-725SMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AFCT-725SMZ?
AFCT-725SMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AFCT-725SMZ 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 AFCT-725SMZ?
For technical support, including AFCT-725SMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AFCT-725SMZ requirements.
6.How does Aetrix verify that AFCT-725SMZ is sourced from the original manufacturer or authorized distributors?
All AFCT-725SMZ 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 AFCT-725SMZ meets industry standards.
7.What is the process for return or replacement of AFCT-725SMZ?
All AFCT-725SMZ units undergo pre-shipment inspection (PSI). If there is an issue with AFCT-725SMZ, 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 AFCT-725SMZ part is unused and in its original packaging.
Return procedure for AFCT-725SMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AFCT-725SMZ Tags
-
AFBR-5972EZ
Broadcom Limited
-
AFBR-5972BZ
Broadcom Limited
-
FTLF8519P3BNL
Coherent
-
AFBR-5803Z
Broadcom Limited
-
AFBR-5803TZ
Broadcom Limited
-
FTLF8519P3BTL
Coherent
-
AFBR-5803ATZ
Broadcom Limited
-
AFBR-5803ATQZ
Broadcom Limited
-
FTLX8574D3BCV
Coherent
-
FTLF8526P3BNL
Coherent
-
FTLF8519F2GCL
Coherent
-
FTLF1318P3BTL
Coherent
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
