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Vishay General Semiconductor - Diodes Division SMF48A-HM3-08
- Part No.:
- SMF48A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-HM3-08.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,756
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Product details
Overview
SMF48A-HM3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in high-speed data lines. It features a 48 V stand-off voltage (VRWM), 53.3 V minimum reverse breakdown voltage (VBR), 77.4 V maximum clamping voltage (VC) at 2.6 A peak pulse current (IPPM), and 200 W peak pulse power (10/1000 μs). It is used in USB 2.0, HDMI, and industrial I/O interfaces requiring ±30 kV IEC 61000-4-2 ESD immunity.
For engineers reviewing the SMF48A-HM3-08 datasheet, SMF48A-HM3-08 pinout, SMF48A-HM3-08 application, or SMF48A-HM3-08 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SOD-123W-compatible packaging, low-capacitance (161 pF) performance, and real-world ESD protection design context for high-reliability embedded systems.
Technical Context
This device operates as a unidirectional TVS diode with a single protection path, leveraging silicon avalanche clamping to divert ESD transients away from sensitive circuitry. Its low incremental surge resistance ensures rapid voltage clamping during 10/1000 μs surges, while its 161 pF capacitance at 0 V supports signal integrity in 480 Mbps USB 2.0 channels.
The SMF48A-HM3-08 is qualified per AEC-Q101 for automotive-grade reliability, with operating temperature range of −65 °C to +175 °C and thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs. Its DO-219AB footprint enables compatibility with SOD-123W, SOD-123F, and SOD-123FL reflow processes without layout redesign.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 48 V - Maximum continuous reverse voltage before clamping begins; sets safe operating margin for 48 V nominal bus lines. |
| Reverse Breakdown (VBR) | 53.3–59 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| Clamping Voltage (VC) | 77.4 V at 2.6 A (10/1000 μs) - Peak voltage seen by protected IC during surge; limits stress on downstream 75 V-rated receivers. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration transients common in industrial ESD events without degradation. |
| Capacitance (CD) | 161 pF at 0 V, 1 MHz - Low enough to avoid signal distortion in USB 2.0 full-speed (480 Mbps) data lanes. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD robustness requirements. |
| AEC-Q101 Qualified | Yes - Validated for automotive under-hood and infotainment applications per stress test conditions including HBM > 8 kV. |
Pinout & Package
SMF48A-HM3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), 3.9 mm × 1.9 mm footprint, cathode-marked anode-cathode configuration. Compatible with SOD-123W land pattern and standard reflow profiles (peak ≤ 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input/Line side | Connected to signal line or power rail needing protection; carries surge current into diode during clamping. |
| Cathode (Pin 2) | Ground reference | Connected to system ground or low-impedance return path; completes clamping loop during ESD event. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Supports repeated ESD strikes in harsh industrial environments without parameter drift or failure. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for external ESD test margining in medical and factory automation designs. |
| 161 pF capacitance at 0 V | Preserves signal rise/fall times in USB 2.0 and CAN FD interfaces up to 5 Mbps without jitter penalty. |
| AEC-Q101 qualification | Enables drop-in use in automotive body control modules and ADAS sensor interfaces without requalification. |
| SOD-123W/SOD-123F footprint compatibility | Allows reuse of existing stencil and placement tooling across multiple Vishay TVS families. |
Applications
| USB 2.0 Data Lines | HDMI DDC/CEC Channels |
|---|---|
|
Use Scenario: Protecting differential USB 2.0 D+/D− lines against connector hot-plug ESD in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline between connector and USB transceiver IC. Use Value: Clamps transients to ≤77.4 V within nanoseconds, preserving 480 Mbps data integrity and preventing PHY latch-up. |
Use Scenario: Safeguarding HDMI DDC (I²C) and CEC control lines in smart TVs against user-handling ESD. IC Role / Device Role / Timing Role: Standoff-voltage-matched TVS on bidirectional 5 V control buses with minimal capacitive loading. Use Value: 161 pF capacitance avoids I²C timing violations while delivering ±30 kV contact discharge immunity. |
| Industrial RS-485 Transceivers | Automotive LIN Bus Nodes |
|
Use Scenario: Shielding RS-485 half-duplex transceivers in factory PLC I/O modules from cable-discharge events. IC Role / Device Role / Timing Role: Primary transient suppressor on A/B differential pair, referenced to local ground plane. Use Value: 48 V VRWM aligns with RS-485 common-mode range; 77.4 V VC prevents transceiver overvoltage damage. |
Use Scenario: ESD hardening of LIN slave nodes (e.g., door modules) exposed to assembly-line handling and service port access. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional TVS on LIN bus line, grounded at node end. Use Value: −65 °C to +175 °C operation supports under-hood deployment; ±30 kV air discharge meets OEM ESD specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/57T | Higher clamping voltage (80.5 V), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 200 W rating same. | Less suitable for space-constrained USB/HDMI layouts; better for high-power industrial power rails. | Select SMAJ48A-E3/57T only when board area allows larger footprint and higher VC is acceptable. |
| TPD4E001DPYR | Quad-channel, 12 pF/channel, 5.5 V VRWM - not voltage-compatible; requires series resistor for 48 V bias. | Designed for low-voltage high-speed data (USB 3.0, PCIe); unsuitable as direct replacement for 48 V bus protection. | TPD4E001DPYR is not a functional alternative for SMF48A-HM3-08; use only in <5 V signal paths with redesign. |
Compared with SMAJ48A-E3/57T and TPD4E001DPYR, SMF48A-HM3-08 uniquely balances 48 V standoff, 77.4 V clamping, 161 pF, and DO-219AB size-making it optimal for compact, high-voltage data line protection where layout density and precise voltage matching are critical.
Availability
SMF48A-HM3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial RS-485 networks, and automotive LIN bus nodes requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant sourcing.
Supply support for SMF48A-HM3-08 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed data line ESD protection with optimized capacitance, clamping, and AEC-Q101 qualification-designed specifically for USB, HDMI, CAN, and LIN interfaces in demanding environments.
FAQ
What is the clamping voltage of SMF48A-HM3-08 at its rated peak pulse current?
The SMF48A-HM3-08 has a maximum clamping voltage (VC) of 77.4 V when subjected to a 2.6 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMF48A-HM3-08 maintains this clamping performance across its full operating temperature range.
Is SMF48A-HM3-08 qualified for automotive applications?
Yes, SMF48A-HM3-08 is AEC-Q101 qualified, having passed all required stress tests including human body model (HBM) > 8 kV, temperature cycling, and high-temperature operating life. It is rated for operation from −65 °C to +175 °C, making it suitable for under-hood and infotainment applications. The SMF48A-HM3-08 part number includes the "H" grade code indicating AEC-Q101 compliance per Vishay's ordering nomenclature.
What package type does SMF48A-HM3-08 use, and is it compatible with automated assembly?
SMF48A-HM3-08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, with cathode marking and SOD-123W-compatible footprint. It is fully wave- and reflow-solderable, qualified for peak temperatures up to 260 °C per J-STD-020 MSL level 1. The SMF48A-HM3-08 is supplied on 8 mm tape-and-reel (3K per 7″ reel), supporting high-speed pick-and-place assembly.
How does the capacitance of SMF48A-HM3-08 affect high-speed signal integrity?
SMF48A-HM3-08 exhibits 161 pF typical capacitance at 0 V and 1 MHz, which is low enough to avoid measurable rise-time degradation or jitter in USB 2.0 (480 Mbps) and RS-485 (10 Mbps) signals when placed with proper layout practices. Its capacitance rolls off rapidly above 1 V reverse bias, further minimizing dynamic loading. For SMF48A-HM3-08, this enables robust ESD protection without signal integrity trade-offs in medium-speed digital interfaces.
Can SMF48A-HM3-08 replace older SMAJ or P6KE series TVS diodes?
SMF48A-HM3-08 is not a direct replacement for SMAJ or P6KE series due to differences in package size, thermal resistance, and clamping behavior. While all provide 48 V standoff, SMF48A-HM3-08 offers lower profile, tighter VBR tolerance, and lower capacitance-but requires PCB layout adaptation for DO-219AB. Substituting SMF48A-HM3-08 for SMAJ48A demands verification of trace inductance and ground path impedance to maintain clamping efficacy.
SMF48A-HM3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 2.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 161pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF48A-HM3-08 FAQ
1.How can I place an order for SMF48A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-HM3-08 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 SMF48A-HM3-08 reliable?
The price and inventory of SMF48A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF48A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF48A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-HM3-08?
SMF48A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-HM3-08 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 SMF48A-HM3-08?
For technical support, including SMF48A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-HM3-08 requirements.
6.How does Aetrix verify that SMF48A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF48A-HM3-08 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 SMF48A-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF48A-HM3-08?
All SMF48A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-HM3-08, 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 SMF48A-HM3-08 part is unused and in its original packaging.
Return procedure for SMF48A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-HM3-08 Tags
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