Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Manufacturer | Littelfuse |
| Exact MPN | SM712-02HTG |
| Product Category | TVS Diodes |
| Package | SOT-23 |
| Packing | 3,000 pcs/reel |
| Polarity | Bidirectional |
| Reverse Standoff Voltage (VRWM) | 7V; 12V |
| Clamping Voltage | 31V; 19V |
| Peak Pulse Current (IPP) | 19A@8/20us |
Product Overview
Two-channel, asymmetrical TVS diode array for ESD, EFT, and lightning protection; intended for RS-485 and interfaces with -7 V to +12 V working voltages.
The two distinct standoff voltages support asymmetric RS-485 protection rather than ordinary symmetrical signal-line clamping. ; The 19 A, 8/20 µs rating and 600 W pulse rating support surge protection, but the 19/31 V clamp values must be compared with the protected transceiver’s absolute maximum voltage. ; 75 pF typical capacitance may materially load high-speed or tightly impedance-controlled lines; validate signal integrity.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Littelfuse |
| Exact MPN | SM712-02HTG |
| Functional Category | TVS Diodes |
| Package | SOT-23 |
| Packing | 3,000 pcs/reel |
| Source Catalog ID | C172881 |
| Polarity | Bidirectional |
| Reverse Standoff Voltage (VRWM) | 7V; 12V |
| Clamping Voltage | 31V; 19V |
| Peak Pulse Current (IPP) | 19A@8/20us |
Selection Notes
Asymmetrical dual-voltage protection; RS-485/common-mode topology; clamp voltage versus surge current; 75 pF loading; SOT23-3 footprint and AEC-Q101 qualification.
Coordinate VRWM with the normal signal/rail voltage and verify clamping voltage plus pulse-current/power capability for the surge waveform.
Design Considerations
-
- Verify each RS-485 line’s normal negative/positive voltage remains within the specified -7 V to +12 V working range. 2. Verify the system surge waveform and source impedance do not exceed 19 A at 8/20 µs or the relevant clamp condition. 3. Compare the 19 V/31 V clamping conditions against transceiver absolute maximum ratings. 4. Include 75 pF typical line-to-ground capacitance in bus loading and SI simulation. 5. Confirm the PCB footprint is SOT23-3/TO-236 and procurement uses the exact SM712-02HTG reel variant.
Application Fit
RS-485, Fieldbus, Modbus, Profibus, DMX512, DALI lighting control, security systems, ATMs, and communications equipment.
Exact Variant and Procurement Notes
Exact orderable SM712-02HTG; SOT23-3, 3-pin, marking “712”; T = tape-and-reel, G = Green; 3,000 pieces/reel. The manufacturer datasheet states AEC-Q101 qualification, RoHS/lead-free status, and MSL-1.
Manufacturer Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. Physical product, label, packaging, and Date Code photos may be provided where appropriate.
Request a Quote
For SM712-02HTG quotation, provide the exact MPN, required quantity, destination, target Date Code if applicable, and any inspection or testing requirements.
