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Diodes Incorporated ZLNB100N8TC
- Part No.:
- ZLNB100N8TC
- Manufacturer:
- Diodes Incorporated
- Category:
- RF Misc ICs and Modules
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ZLNB100N8TC.pdf
- Description:
- IC CTRLR DUAL POLAR SWITCH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,703
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Product details
Overview
ZLNB100N8TC from Zetex Semiconductors (now Diodes Incorporated) is a dual-channel LNB polarity switch controller for satellite twin-LNB systems. It provides independent vertical/horizontal switching per channel via voltage-sensitive inputs (14.5V threshold), delivers 15mA source / 10mA sink outputs, operates from 5–12V supply, and supports -40°C to +85°C ambient. Used in IF switch boxes to decode dual-feed satellite signals.
For engineers reviewing the ZLNB100N8TC datasheet, ZLNB100N8TC pinout, ZLNB100N8TC application, or ZLNB100N8TC equivalent, key selection criteria include input threshold stability over temperature, simultaneous standard/inverted output capability, transient resilience with single-resistor protection, and compatibility with TTL/CMOS, pin diodes, and IF-amp supply switching.
Technical Context
The ZLNB100N8TC implements two fully isolated voltage-detection channels, each with temperature-compensated 14.0–15.0V input thresholds (typ. 14.5V) and <100µs switching speed. Inputs are designed for direct connection to LNB DC feed lines via 10kΩ resistors.
Each channel drives complementary Vert/Hor outputs: below threshold → Vert high / Hor low; above threshold → Vert low / Hor high. All outputs meet TTL/CMOS logic levels and support 10–15mA drive into pin diode or IF-amp loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V to 12V - enables direct use with standard LNB bias supplies without regulation |
| Input Threshold | 14.0–15.0V (typ. 14.5V), temp-compensated - ensures reliable H/V decoding across -40°C to +85°C |
| Input Current | 10–40µA at 25V - allows transient protection with single series resistor per channel |
| Output Drive | Sources 15mA / sinks 10mA - directly switches PIN diodes and powers IF amplifiers |
| Quiescent Current | Typ. 4mA - minimizes standby power draw in always-on satellite receivers |
| Switching Speed | ≤100µs - meets fast polarization switching requirements for multi-satellite tracking |
Pinout & Package
Package: SO8 (Small Outline 8-pin, 3.99mm × 4.98mm body, 0.65mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VPOL1 | Voltage-sensitive input for Channel 1 polarity detection (H/V decision at ~14.5V) |
| 2 | VPOL2 | Voltage-sensitive input for Channel 2 polarity detection (independent of Channel 1) |
| 3 | Vert1 | Channel 1 vertical-switch output - high when VPOL1 ≤14V, low when ≥15V |
| 4 | Hor1 | Channel 1 horizontal-switch output - complement of Vert1 |
| 5 | Gnd | Analog/digital ground reference for all internal circuitry and outputs |
| 6 | Vcc | Positive supply rail (5–12V); powers both channels and output drivers |
| 7 | Vert2 | Channel 2 vertical-switch output - functionally identical to Vert1, electrically isolated |
| 8 | Hor2 | Channel 2 horizontal-switch output - complement of Vert2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent polarity detection channels | Enables simultaneous control of two physically separate LNB feeds without crosstalk or shared timing constraints |
| Temperature-compensated input threshold | Maintains ±0.5V threshold window across -40°C to +85°C, eliminating calibration drift in outdoor installations |
| Simultaneous standard + inverted outputs per channel | Eliminates need for external inverters when driving complementary PIN diode pairs or differential IF-amp enable paths |
| Low 4mA quiescent current | Reduces thermal load and power supply burden in compact, sealed LNB housings with limited heat dissipation |
| Transient-resistant input architecture | Supports robust operation with only one 10kΩ series resistor per input - no TVS or clamping diodes required |
Applications
| Direct Satellite TV Twin LNB | IF Switch Box for Multi-Receiver Systems |
|---|---|
Use Scenario: Dual-feed satellite dish serving two independent set-top boxes, requiring independent H/V polarization selection per receiver. IC Role / Device Role / Timing Role: Dual-channel polarity decoder - converts incoming 13/18V LNB supply voltage into synchronized Vert/Hor control signals for two separate LNB front-ends. Use Value: Replaces eight discrete transistors and resistors per channel, reducing PCB area by >65% and improving long-term reliability in thermally cycling outdoor environments. | Use Scenario: Centralized IF distribution unit routing signals from four LNBs to eight tuners across multiple rooms. IC Role / Device Role / Timing Role: Dual-polarity multiplexer controller - manages H/V state for two independent IF signal paths while maintaining isolation between receiver chains. Use Value: Enables true independent tuning (e.g., BBC on Tuner 1, Sky Sports on Tuner 2) without signal contention or cross-talk due to shared control logic. |
| LNB Switch Box for Motorized Dish Systems | Commercial Satellite Headend Distribution |
Use Scenario: Motorized C-band/Ku-band dish with dual-output LNBs tracking multiple orbital positions. IC Role / Device Role / Timing Role: Fast-switching polarity arbiter - toggles H/V states within ≤100µs during dish slew to maintain lock during position transitions. Use Value: Prevents signal dropout during polarization switching by ensuring sub-200µs total path delay from input voltage change to PIN diode actuation. | Use Scenario: Broadcast headend feeding 50+ IPTV set-top boxes via multiswitch architecture. IC Role / Device Role / Timing Role: High-reliability dual-channel LNB interface IC - provides stable, low-drift polarity control across 24/7 operation with minimal maintenance. Use Value: Delivers <1ppm/year threshold drift, enabling 5+ year field deployment without recalibration or replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-polarization LNB switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4390ESE+ | Single-channel, requires dual ICs; higher supply current (8mA typ); no integrated temp compensation | Limited to single-LNB designs unless duplicated; less suitable for wide-temperature outdoor enclosures | Preferable only where board space permits duplication and thermal range is constrained to 0–70°C |
| STV0902B | Integrated LNB controller + tuner demodulator; 3.3V-only supply; no discrete Vert/Hor outputs | Targets full-tuner SoC integration, not discrete switch replacement; incompatible pinout and logic interface | Only viable when redesigning entire receiver architecture - not a drop-in or functional substitute |
Compared with MAX4390ESE+ and STV0902B, the ZLNB100N8TC uniquely delivers true dual-channel independence, temperature-stable 14.5V threshold, and native TTL/CMOS-compatible outputs - making it the only solution that replaces discrete polarity switches in legacy twin-LNB hardware without board rework or firmware changes.
Availability
ZLNB100N8TC is available at Aetrix Electronics and suitable for satellite TV twin-LNB modules, IF switch boxes, and motorized dish control units requiring stable component supply, long-lifecycle availability, and guaranteed parametric consistency across production batches.
Supply support for ZLNB100N8TC 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
Zetex Semiconductors (acquired by Diodes Incorporated in 2008) specialized in high-performance analog and interface ICs for RF, power management, and signal conditioning applications.
The ZLNB100 series was developed specifically for satellite LNB support functions - integrating dual-polarity detection, output drive, and thermal stability into a single SO8/MSOP8 package to replace legacy discrete solutions in cost-sensitive consumer and prosumer satellite equipment.
FAQ
What is the maximum input voltage the ZLNB100N8TC can tolerate on VPOL1/VPOL2 pins?
The absolute maximum rating for VPOL1 and VPOL2 is 25V continuous. This rating is validated under conditions where inputs are biased through 10kΩ resistors, as specified in the datasheet. Exceeding 25V risks permanent damage to the internal ESD protection structures, even with external limiting.
Can ZLNB100N8TC drive PIN diodes directly without external transistors?
Yes - each Vert/Hor output sources up to 15mA and sinks 10mA, matching typical PIN diode forward current requirements (5–12mA). The output voltage swing (VCC−1.2V high, 0.25V low) ensures reliable diode turn-on/turn-off without level-shifting or buffer stages.
Is the 14.5V input threshold adjustable or fixed?
The threshold is fixed and factory-trimmed - no external components or configuration pins adjust it. It is temperature-compensated internally to stay within 14.0–15.0V across the full −40°C to +85°C operating range, as verified in production test.
Does ZLNB100N8TC require decoupling capacitors on Vcc?
Yes - a minimum 100nF ceramic capacitor placed within 2mm of the Vcc (Pin 6) and Gnd (Pin 5) pins is mandatory. This suppresses supply noise generated during fast output transitions and prevents false triggering caused by coupling between channels.
ZLNB100N8TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Polarity Multiplexer
- Frequency:
- -
- RF Type:
- LNB, DiSEqC™ , STBs
- Secondary Attributes:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
ZLNB100N8TC FAQ
1.How can I place an order for ZLNB100N8TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLNB100N8TC 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 ZLNB100N8TC reliable?
The price and inventory of ZLNB100N8TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLNB100N8TC is usually 5 days.
3.What payment methods are accepted for ZLNB100N8TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLNB100N8TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLNB100N8TC?
ZLNB100N8TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLNB100N8TC 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 ZLNB100N8TC?
For technical support, including ZLNB100N8TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLNB100N8TC requirements.
6.How does Aetrix verify that ZLNB100N8TC is sourced from the original manufacturer or authorized distributors?
All ZLNB100N8TC 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 ZLNB100N8TC meets industry standards.
7.What is the process for return or replacement of ZLNB100N8TC?
All ZLNB100N8TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLNB100N8TC, 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 ZLNB100N8TC part is unused and in its original packaging.
Return procedure for ZLNB100N8TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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