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Vishay General Semiconductor - Diodes Division SM5S48CAHM3/I
- Part No.:
- SM5S48CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S48CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,994
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Product details
Overview
SM5S48CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, with 53.3 V minimum breakdown voltage (VBR), 48.0 V stand-off voltage (VWM), and 77.4 V maximum clamping voltage (VC) at 46.5 A peak pulse current (IPPM). It delivers 3600 W peak pulse power (10/1000 µs), operates from −55 °C to +175 °C, and is AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM5S48CAHM3/I datasheet, SM5S48CAHM3/I pinout, SM5S48CAHM3/I application, or SM5S48CAHM3/I equivalent, this device is selected for high-reliability 48 V automotive power rail surge suppression where low leakage (<10 µA at VWM), MSL Level 1 moisture sensitivity, and ISO 7637-2 compliance are required.
Technical Context
This TVS diode uses an avalanche-based silicon junction structure optimized for fast response (<1 ns) to transient overvoltages. Its bidirectional configuration enables symmetric clamping across both polarities without polarity marking, and its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.45 °C/W).
The device is characterized for operation under high junction temperature stress (TJ = 175 °C), with derated peak pulse power above 25 °C ambient per JEDEC 51-2A test conditions. It meets ISO 16750-2 for supply voltage transients and supports 245 °C lead-free reflow per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 53.3 V - Ensures reliable triggering above normal 48 V system operating voltage |
| VWM | 48.0 V - Maximum continuous reverse voltage before significant leakage begins |
| VC @ IPPM | 77.4 V - Clamped voltage during 46.5 A 10/1000 µs surge, limiting downstream IC stress |
| PPPM (10/1000 µs) | 3600 W - Sustains high-energy transients common in 48 V automotive load dump events |
| IPPM | 46.5 A - Peak surge current capability at rated clamping voltage |
| TJ max | +175 °C - Enables placement near hot engine control units without derating |
| Leakage @ VWM | <10 µA - Minimizes standby power loss in always-on vehicle modules |
Pinout & Package
SM5S48CAHM3/I is housed in a DO-218AC surface-mount package with two terminals: Terminal 1 (anode-side lead) and Terminal 2 (metal heatsink/cathode-side base). The package features matte tin-plated leads, halogen-free molding compound (UL 94 V-0), and no cathode band due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode-side metallized lead | Solderable termination for PCB connection; defines anode side in unidirectional interpretation but functionally symmetric in bidirectional operation |
| Terminal 2 | Integrated metal heatsink / cathode-side base | Primary thermal path to PCB copper; carries full surge current and provides RθJM = 0.45 °C/W for high-power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| ISO 7637-2 compliance | Withstands load dump pulses up to 60 V for 400 ms and other defined transient waveforms |
| MSL Level 1 rating | Zero floor life limitation; supports standard SMT assembly without dry pack or baking |
| Junction temperature capability | Full electrical performance guaranteed up to +175 °C junction temperature |
| Halogen-free & RoHS | M3 suffix confirms compliant materials, matte tin plating, and JESD201 Class 2 whisker resistance |
Applications
| Automotive Load Dump Protection | 48 V Mild Hybrid Power Rail |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) during alternator load dump events in 12 V/48 V dual-battery systems. IC Role / Device Role: Primary clamping device placed directly across battery input rails to limit transient voltage to safe levels. Use Value: Clamps to 77.4 V at 46.5 A, preventing damage to 80 V-rated DC-DC converters and microcontrollers. | Use Scenario: Surge suppression on 48 V bus powering electric turbochargers, active suspension, and 48 V starter-generators. IC Role / Device Role: Bidirectional TVS mounted at point-of-load to absorb switching transients and regenerative energy spikes. Use Value: 3600 W peak power handling ensures survivability of repeated 48 V bus transients exceeding 100 V. |
| Industrial Motor Drive Inputs | Commercial Vehicle Telematics |
Use Scenario: Input protection for 48 V industrial PLC I/O modules exposed to inductive kickback from solenoids and contactors. IC Role / Device Role: Standoff-clamp TVS placed upstream of input EMI filters and DC-DC front-ends. Use Value: 48.0 V VWM allows stable operation during nominal 48 V supply while responding within nanoseconds to >100 V spikes. | Use Scenario: Voltage transient protection for LTE/V2X telematics gateways powered from commercial truck 24 V–48 V auxiliary systems. IC Role / Device Role: Secondary-level TVS on power entry and CAN FD interface lines to meet OEM EMC requirements. Use Value: Meets ISO 16750-2 Pulse 4 (load dump) and Pulse 5b (reverse battery) test profiles with minimal footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/5A | Unidirectional; SMA package; lower PPPM (400 W); VC = 77.4 V at 5.5 A | Not suitable for bidirectional or high-surge automotive load dump; limited to low-energy signal line protection | Select only for cost-sensitive non-automotive 48 V DC applications with sub-10 A surge requirements |
| TPSMD48CA | DO-218AB package; same VWM/VC; PPPM = 3600 W; AEC-Q101 qualified; slightly higher VBR (54.4–57.1 V) | Compatible mechanical fit but different thermal pad layout; identical functional role in 48 V automotive systems | Drop-in alternative if DO-218AB footprint is already standardized; verify pad thermal relief compatibility |
Compared with SMAJ48A-E3/5A and TPSMD48CA, SM5S48CAHM3/I offers superior surge current capacity (46.5 A vs. 5.5 A), true bidirectional symmetry, and optimized DO-218AC thermal performance-making it the preferred choice for high-reliability 48 V automotive power rail protection where sustained energy absorption is critical.
Availability
SM5S48CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, 48 V mild hybrid systems, and industrial motor drive inputs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for SM5S48CAHM3/I 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 General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on automotive, industrial, and computing applications.
The SM5SxxCA family is designed specifically for high-energy transient suppression in demanding automotive environments, targeting load dump, jump start, and ISO 7637-2 compliance in 12 V and 48 V architectures.
FAQ
What is the clamping voltage of SM5S48CAHM3/I at its rated peak pulse current?
The SM5S48CAHM3/I has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated 46.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number: 98458), ensuring predictable voltage limiting during automotive load dump events. The SM5S48CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SM5S48CAHM3/I suitable for bidirectional 48 V power rail protection?
Yes, SM5S48CAHM3/I is explicitly designed as a bidirectional TVS diode with symmetrical clamping characteristics and no cathode band marking. Its VBR range (53.3–58.9 V) and VWM (48.0 V) apply equally to both polarities, making it ideal for protecting 48 V DC power rails against positive and negative transients-including reverse battery and load dump scenarios. The SM5S48CAHM3/I meets ISO 7637-2 Pulse 5a and 5b requirements.
What does the "HM3/I" suffix indicate in SM5S48CAHM3/I?
The "HM3/I" suffix in SM5S48CAHM3/I denotes three key attributes: "H" indicates AEC-Q101 qualification; "M3" specifies halogen-free, RoHS-compliant, Pb-free construction with JESD201 Class 2 whisker resistance; and "I" identifies the packaging format-750-piece 13-inch plastic tape and reel with anode oriented toward sprocket holes. This full suffix confirms the SM5S48CAHM3/I meets automotive-grade material, reliability, and assembly requirements.
How does SM5S48CAHM3/I perform at elevated temperatures?
SM5S48CAHM3/I is rated for continuous operation from −55 °C to +175 °C junction temperature, with all electrical parameters-including VBR, VC, and leakage-guaranteed across this range. Its thermal resistance junction-to-mount (RθJM) is 0.45 °C/W, enabling effective heat transfer to PCB copper. Derating curves in the datasheet confirm usable peak pulse power down to ~70 % of rated 3600 W at TJ = 150 °C, supporting placement near high-temperature ECUs. The SM5S48CAHM3/I maintains stability under thermal stress typical of under-hood automotive locations.
Does SM5S48CAHM3/I require a heatsink on the PCB?
No external heatsink is required for SM5S48CAHM3/I, as its DO-218AC package integrates a metal heatsink terminal (Terminal 2) that serves as the primary thermal path to the PCB. When mounted on a standard FR-4 board with recommended pad layout (per IPC-7351), the device achieves RθJA = 65 °C/W and RθJM = 0.45 °C/W. Adequate copper area (≥100 mm²) connected to Terminal 2 is sufficient for thermal management during surge events. The SM5S48CAHM3/I leverages PCB copper as its heatsink by design.
SM5S48CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S48CAHM3/I FAQ
1.How can I place an order for SM5S48CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S48CAHM3/I 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 SM5S48CAHM3/I reliable?
The price and inventory of SM5S48CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S48CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S48CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S48CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S48CAHM3/I?
SM5S48CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S48CAHM3/I 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 SM5S48CAHM3/I?
For technical support, including SM5S48CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S48CAHM3/I requirements.
6.How does Aetrix verify that SM5S48CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S48CAHM3/I 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 SM5S48CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S48CAHM3/I?
All SM5S48CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S48CAHM3/I, 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 SM5S48CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S48CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S48CAHM3/I Tags
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