Name: /Tools-Info/Kf887b0
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Kejian KF887B0 CATV Optical Receiver (40–860 MHz)

is a Kejian hybrid optical receiver module designed for cable TV (CATV) HFC networks. It accepts a single-mode fiber input (typically 1100–1650 nm wavelength) and converts it to a 75 Ω RF signal across the 40–860 MHz band. With approximately 16 dB forward gain, excellent linearity and flatness (±0.75 dB), and very low noise/distortion, it is used in line-extenders and optical node devices to deliver TV and data signals downstream. The device is supplied at 6 VDC with about 150–160 mA current and meets RoHS compliance. Its SC/APC optical connector and SOT115U plastic package enable easy integration in compact RF-over-fiber receivers.

How EstiSource Helps

Verified Supplier Network: EstiSource maintains a global database of vetted CATV component suppliers. We identify authorized distributors and manufacturers (including Kejian and alternatives) that stock the KF887BO-6, ensuring reliable sourcing. Competitive Pricing: Our platform aggregates quotes from multiple vendors, showing you the best available pricing for single units and bulk quantities. We benchmark the Kejian receiver’s market rates (₹200–300 per piece) so you can negotiate effectively. Technical Insights: EstiSource provides detailed datasheets and quality checks. Engineers can review the KF887BO-6 specifications (frequency, gain, noise figures) in one place. We flag compliance (RoHS, telecom standards) and note important limits (optical input range, bend radius). Streamlined Quoting: Through EstiSource, procurement teams can issue RFQs for the part across our network. Suppliers respond quickly with quotes, lead times, and MOQ requirements. This speeds up sample orders and production sourcing. Design & Sourcing Support: We assist in identifying equivalent parts if needed (for example, recommending similar CATV optical receivers). EstiSource experts can also advise on MPN clarifications (KF887BO-6 vs. KF887BO-24) and connector requirements.

Why Choose EstiSource for Sourcing

EstiSource specializes in sourcing complex electronic components and modules like the KF887B0 optical receiver. Our strengths include: - Domain Expertise: We understand CATV/HFC systems and their parts. Our team guides you through technical requirements (e.g. gain, RoHS status, packaging) and matches them to supply solutions. - Global Reach: With contacts in Asia (e.g. Chinese and Indian telecom suppliers), the US, and Europe, EstiSource can locate hard-to-find items and manage import logistics if needed. We ensure factory-authorized channels to avoid gray-market risks. - Quality & Compliance: We vet all sources for genuine Kejian parts. EstiSource reviews manufacturing quality (PCB assembly, part marking) and documentation so you receive authentic, compliant components. - Cost Confidence: By aggregating quotes and analyzing cost drivers (material, assembly), EstiSource helps you optimize your BOM budget. We show you typical pricing trends and bulk discount thresholds. - One-Stop Service: From initial quote to delivery, EstiSource assists each step. We track orders, coordinate samples, and even evaluate supplier reliability, letting your procurement team focus on design while we handle sourcing logistics.

1. Material Composition

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2. Manufacturing Process

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3. Challenges and Limitations

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Bandwidth limitation

Covers only 40–860 MHz. Modern DOCSIS 3.1 and digital cable systems may require up to ~1 GHz, so this IC is limited to legacy CATV bands.

Input power range

Optical input is rated roughly –8 dBm to +2 dBm. Exceeding +2 dBm risks saturation or damage. Below –8 dBm the output may fall off. The built-in optical-AGC helps, but input must be controlled.

Temperature range

Specified –20°C to +85°C. Extreme outdoor or poorly-cooled installations could degrade performance.

Connector/fiber handling

SC/APC fixed connector only; fiber must not bend below ~35 mm radius to avoid loss. The fiber coupling imposes a 5 N max pull and tight-bend limit.

Single-channel forward path

This IC only provides the downstream (forward) path. No return-channel or multiport functionality. Applications needing bi-directional signals require separate return nodes.

Vendor availability

Kejian is a regional (China) manufacturer. Sourcing may require import or niche distributors. Alternatives may involve re-qualification.

Performance trade-offs

Very high output (87 dBµV) implies some distortion floors (CTB –66 dB, CSO –64 dB). Extremely low noise but not a full fiber-optic digital solution – best suited for analog/NTSC/PAL channels.

Power requirements

Requires a stable 6 V supply at ~150 mA. Noise or surges on the supply line can affect RF output quality.

4. Costing

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5. Properties and Characteristics

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Frequency Range

40–860 MHz RF output. Bandwidth is flat (±0.75 dB) across this range, suitable for CATV channel plans up to midband.

Optical Input

Single-mode fiber (SC/APC or FC/APC) for 1100–1650 nm. The photodiode responsivity is ~0.85 A/W at 1310 nm and 0.9 A/W at 1550 nm. Typical input sensitivity supports –8 dBm to +2 dBm optical power.

RF Output

75 Ω F-female connector. Maximum RF output ~87 dBµV per channel at 0 dBm optical input. Forward gain is ~16 dB (e.g. +2 dBm in yields ≈84 dBµV out at 550 MHz). Output return loss ≈–12 dB (40–860 MHz).

Linearity/Noise

Excellent linearity: composite triple-beat (CTB) ~–66 dB, composite second-order (CSO) ~–64 dB (@ –8 dBm optical). Carrier-to-noise ratio ≥52 dB (at 0 dBm optical). Low distortion ensures high-quality analog TV performance.

Gain Control

The IC includes an optical AGC loop (optical-AGC feature) that helps maintain consistent output across input power variations, improving dynamic range.

Power Requirements

+6 V DC supply (VB = 6V nominal). Typical current ~155 mA (max ~175 mA). Power consumption ~1 W.

Package

7-pin flange-mount plastic package (SOT115 format). External housing is usually plastic (body) with an aluminum heat-spreader flange. Marked green (Kejian brand) in many examples.

Environmental

Operating –20°C to +85°C. RF and optical connectors extend beyond the package and should be strain-relieved.

6. Frequently Asked Questions

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Q: What frequency and band does KF887B0 cover?

A: It operates from 40 MHz up to 860 MHz, covering the full standard CATV channel spectrum (UHF/VHF analog TV and basic digital cable bands).

Q: What wavelengths and input power levels are supported?

A: The receiver accepts single-mode optical signals from ~1100 nm up to 1650 nm. It is designed for optical input around –8 dBm to +2 dBm (per the datasheet), with AGC to handle varying levels.

Q: What supply voltage and current does it need?

A: The KF887BO-6 variant runs on +6 V DC. It typically draws ~150–160 mA, peaking around 175 mA. A clean regulated 6 V supply is recommended.

Q: What is the typical RF output level or gain?

A: The device provides about 16 dB gain. At 0 dBm optical input, it can produce ~87 dBμV output per channel. For example, –1 dBm input yields ~83 dBμV, –10 dBm yields ~68 dBμV, etc.

Q: What connector types are used?

A: Optical input uses an SC/APC (angled) female connector (single-mode fiber). The RF output is a 75 Ω F-type (female) connector. Internal connections use gold-plated leads in the SOT115 package.

Q: Is the KF887B0 compliant with RoHS and telecom standards?

A: Yes, it is RoHS-compliant, as noted by suppliers. It meets industry norms for CATV nodes. However, verifying the certificate from the manufacturer or distributor is advised.

Q: Where can I source KF887B0 parts?

A: EstiSource can connect you to authorized electronic component distributors and global suppliers for this part. Regional vendors (e.g. Indian or Chinese suppliers) list it by model name (KF887BO-6). EstiSource’s platform provides real-time pricing and multiple quotes for bulk orders of such modules.

Q: Are there variants or drop-in replacements?

A: Kejian also offers variants (e.g. KF887BO-24 for 24 V environments) and similar modules (KB834H, etc.). Direct drop-in replacements may not be available outside Kejian’s line; alternate designs would require re-testing. Check EstiSource for cross-referenced parts or equivalents.

Q: Can this module be used in outdoor nodes or under harsh conditions?

A: The IC itself is rated to +85°C, but it must be installed in a suitable enclosure for weather protection. Mini-node modules often use similar hardware in weatherproof cases (with separate power supplies). For outdoor use, ensure proper sealed housing and temperature control.

Sources: Kejian product listings and datasheets provide specifications (frequency range, gain, input/output levels, compliance). Supplier catalogs and import records confirm pricing and availability. The content above also references standard optical/CATV module practices, and uses EstiSource’s sourcing expertise guidelines.