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Vishay General Semiconductor - Diodes Division SMF48A-M3-18
- Part No.:
- SMF48A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-M3-18.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:7,241
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Product details
Overview
SMF48A-M3-18 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), 77.4 V maximum clamping voltage at 2.6 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used in USB 2.0, HDMI, and industrial sensor interfaces requiring robust electrostatic discharge protection.
For engineers reviewing the SMF48A-M3-18 datasheet, SMF48A-M3-18 pinout, SMF48A-M3-18 application, or SMF48A-M3-18 equivalent, this page delivers verified electrical parameters, package dimensions, real-world clamping behavior, AEC-Q101 qualification status, and direct alternative part comparisons - all aligned with Vishay's Rev. 2.4 specification (Document 85881).
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures rapid voltage limiting during ESD events, while its 161 pF typical junction capacitance at 0 V supports signal integrity in 100 Mbps–480 Mbps interfaces.
The SMF48A-M3-18 is rated for operation from –65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs. It meets IEC 61000-4-2 (±30 kV contact/air) and AEC-Q101 Class H3B (>8 kV HBM), confirming suitability for automotive infotainment and industrial control environments where reliability under thermal and electrical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 48 V - defines maximum continuous operating voltage before clamping begins; sets safe margin below system rail in 48 V nominal bus applications. |
| Clamping Voltage (VC) | 77.4 V at IPPM = 2.6 A (10/1000 μs) - limits transient voltage seen by downstream ICs; enables protection of 75 V-rated receivers. |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration surges without degradation; sufficient for IEC 61000-4-5 Level 2 (1 kV) line transients. |
| Junction Capacitance | 161 pF at VR = 0 V, f = 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485, but not suitable for PCIe Gen3+ or HDMI 2.1. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements for exposed ports. |
| Operating Temp Range | –65 °C to +175 °C - supports under-hood automotive, motor drive, and industrial power module designs without derating. |
Pinout & Package
The SMF48A-M3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, molded in UL 94 V-0 compound, MSL level 1, and reflow-solderable per J-STD-020 (peak 260 °C). Cathode is marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protection path | Connected to protected line (e.g., USB D+); conducts during negative transients when cathode is biased higher. |
| Cathode | Clamp reference node | Typically tied to ground or low-impedance return; establishes clamping threshold relative to reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 77.4 V VC at 2.6 A ensures downstream ICs see <80 V during worst-case surge - critical for 75 V absolute max-rated PHYs. |
| "Low Noise" fast response | Sub-nanosecond turn-on time minimizes voltage overshoot during ESD strikes, preserving signal fidelity in high-speed analog/digital paths. |
| AEC-Q101 qualified | Qualified per AEC-Q101 Rev D for automotive use - validated for temperature cycling, humidity bias, and mechanical shock in infotainment and ADAS modules. |
| SOD-123W footprint compatibility | Enables drop-in replacement in existing SOD-123W layouts without PCB redesign - same pad dimensions and solder profile. |
Applications
| USB 2.0 Interface Protection | HDMI Source Port Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in automotive head units against hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between data line and chassis ground, clamping transients before they reach the USB transceiver. Use Value: 161 pF capacitance avoids signal rise-time degradation at 480 Mbps; ±30 kV ESD rating exceeds ISO 10605 requirements for vehicle-mounted ports. | Use Scenario: Safeguarding HDMI TMDS channels in set-top boxes and digital signage against user-handling ESD during cable insertion. IC Role / Device Role / Timing Role: Single-channel clamping device on each TMDS+ line, referenced to local ground plane to suppress common-mode transients. Use Value: 77.4 V clamping voltage stays below HDMI sink IC's 100 V abs max rating; DO-219AB low height (<1.1 mm) fits tight board-to-panel spacing. |
| Industrial CAN Bus Node | 48 V DC Power Rail Clamp |
Use Scenario: Adding secondary ESD protection on CAN_H/CAN_L lines in factory automation gateways exposed to maintenance personnel contact. IC Role / Device Role / Timing Role: Standoff-limited unidirectional clamp parallel to primary protection, absorbing residual energy after front-end gas discharge tube conduction. Use Value: 48 V VRWM aligns with CAN FD 5 V differential swing over 12–48 V supply rails; 175 °C max junction temp supports enclosure ambient up to 105 °C. | Use Scenario: Suppressing load-dump and jump-start transients on 48 V auxiliary power rails in commercial vehicles and telecom base stations. IC Role / Device Role / Timing Role: Primary TVS clamp across input rail and ground, triggered when voltage exceeds 48 V due to alternator regulation failure or battery reversal. Use Value: 200 W peak pulse power handles 10/1000 μs surges up to 2.6 A; 180 K/W RthJA allows thermal design with minimal copper area on 2-layer boards. |
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 | DO-214AC (SMA) package; 1.8 mm height; 200 W rating; 79.4 V VC at 2.5 A; 170 pF capacitance. | Higher profile (1.8 mm vs. 1.08 mm) limits use in ultra-thin modules; slightly higher clamping voltage reduces margin for 75 V-rated ICs. | Select when legacy SMA footprint exists or when higher surge current handling (IFSM = 40 A) is required beyond SMF48A-M3-18's 50 A rating. |
| TPSMF48A | Same DO-219AB package; identical VRWM (48 V) and VC (77.4 V); AEC-Q101 qualified; 160 pF capacitance; RoHS-compliant with matte Sn terminations. | No functional difference; fully compatible in layout, thermal, and electrical performance; differs only in manufacturer (Littelfuse) and marking code. | Choose for dual-sourcing flexibility; identical pinout, specs, and qualification enable seamless second-source substitution without revalidation. |
Compared with SMAJ48A-E3/57T and TPSMF48A, the SMF48A-M3-18 offers the lowest profile (1.08 mm) and best thermal resistance (180 K/W) among 48 V unidirectional TVS diodes in its class, making it optimal for space-constrained automotive and industrial modules where board height and thermal management are critical.
Availability
SMF48A-M3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI source port hardening, and 48 V DC power rail clamping requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SMF48A-M3-18 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power management, signal conditioning, and circuit protection technologies.
The SMF series is engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and consumer electronics - emphasizing low clamping, AEC-Q101 qualification, and compact surface-mount form factors.
FAQ
What is the maximum clamping voltage of the SMF48A-M3-18 under standard test conditions?
The SMF48A-M3-18 has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 2.6 A. This value is measured per IEC 61000-4-5 and ensures predictable voltage limiting during surge events. The SMF48A-M3-18 maintains this clamping performance across its full operating temperature range (–65 °C to +175 °C), as confirmed in Vishay's Document 85881 Rev. 2.4.
Is the SMF48A-M3-18 qualified to AEC-Q101, and what does that mean for automotive use?
Yes, the SMF48A-M3-18 is AEC-Q101 qualified, meeting stress test requirements including temperature cycling, high-temperature operating life, and human body model ESD (H3B > 8 kV). This qualification validates its reliability in automotive environments such as infotainment systems and body control modules. The SMF48A-M3-18 achieves this while retaining its 48 V VRWM and 77.4 V clamping voltage - critical for protecting 5 V and 3.3 V logic interfaced to 48 V domains.
What is the junction capacitance of the SMF48A-M3-18, and how does it affect high-speed signal lines?
The SMF48A-M3-18 exhibits 161 pF typical junction capacitance at 0 V reverse bias and 1 MHz, as specified in Vishay's electrical characteristics table. This value is low enough to avoid significant signal distortion on USB 2.0 (480 Mbps) and RS-485 links but is too high for PCIe Gen3+ or HDMI 2.1. The SMF48A-M3-18 is therefore optimized for medium-speed data lines where ESD robustness outweighs ultra-low capacitance needs.
Can the SMF48A-M3-18 be used in bidirectional signal protection applications?
No - the SMF48A-M3-18 is a unidirectional TVS diode, intended for clamping positive transients on lines referenced to ground. For bidirectional protection (e.g., RS-232, audio lines), a symmetric device like the SMBJ48CA or a dual-diode array is required. The SMF48A-M3-18's anode-cathode asymmetry means it conducts only when cathode voltage exceeds anode by >48 V; using it on AC-coupled or floating lines risks improper clamping or forward conduction.
What is the recommended PCB footprint and soldering profile for the SMF48A-M3-18?
Vishay specifies a footprint matching the DO-219AB outline: 3.5 mm × 1.7 mm pad length/width, with 1.3 mm pad spacing and 2.9 mm overall center-to-center. Reflow must follow J-STD-020: peak temperature ≤260 °C, ramp rate ≤3 °C/s, and time above 217 °C limited to 60–150 s. The SMF48A-M3-18's MSL level 1 rating permits unlimited floor life, eliminating bake requirements prior to assembly.
SMF48A-M3-18 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:
- General Purpose
- Capacitance @ Frequency:
- 161pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF48A-M3-18 FAQ
1.How can I place an order for SMF48A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-M3-18 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-M3-18 reliable?
The price and inventory of SMF48A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF48A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF48A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-M3-18?
SMF48A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-M3-18 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-M3-18?
For technical support, including SMF48A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-M3-18 requirements.
6.How does Aetrix verify that SMF48A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF48A-M3-18 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-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF48A-M3-18?
All SMF48A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-M3-18, 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-M3-18 part is unused and in its original packaging.
Return procedure for SMF48A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-M3-18 Tags
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