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Vishay General Semiconductor - Diodes Division SM8S48CAHM3/I
- Part No.:
- SM8S48CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S48CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
SM8S48CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 48 V stand-off voltage (VWM), 56.1 V nominal breakdown voltage (VBR), 77.4 V maximum clamping voltage (VC) at 85.3 A peak pulse current (IPPM), and 6600 W peak pulse power (10/1000 μs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified for under-hood automotive electronics.
For engineers reviewing the SM8S48CAHM3/I datasheet, SM8S48CAHM3/I pinout, SM8S48CAHM3/I application, or SM8S48CAHM3/I equivalent, key selection criteria include its DO-218AC package thermal performance (RθJM = 0.35 °C/W), ISO 7637-2 compliance for load dump transients, bidirectional polarity with no cathode band, and 10 μA max reverse leakage at VWM - critical for low-power automotive sensor and ECU protection designs.
Technical Context
This TVS diode uses silicon avalanche junction technology optimized for high-energy transient suppression in 12 V and 24 V automotive systems. Its DO-218AC case integrates a metal heatsink terminal (Lead 2) for low thermal resistance (RθJM = 0.35 °C/W), enabling robust surge handling without external heatsinking. The device is characterized for 10/1000 μs and 10/10,000 μs waveforms per IEC 61000-4-5 and ISO 7637-2.
It delivers stable clamping performance across −55 °C to +175 °C junction temperature, with <10 μA leakage at 48 V and <50 μA at TJ = 175 °C, supporting reliable operation in engine control units and body control modules where ambient temperatures exceed 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold |
| VBR (nom) | 56.1 V - nominal breakdown voltage at 5 mA test current; defines onset of avalanche conduction |
| VC @ IPPM | 77.4 V at 85.3 A - clamping voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure |
| PPPM (10/1000 μs) | 6600 W - peak pulse power rating; supports single-event load dump surges up to 120 V, 350 ms per ISO 7637-2 |
| TJ max | +175 °C - maximum junction temperature; enables placement near high-heat sources like powertrain ECUs |
| Leakage @ VWM | ≤10 μA at 25 °C - ultra-low standby current; preserves battery life in always-on automotive modules |
| Package | DO-218AC - surface-mount package with integrated metal heatsink terminal (Lead 2); provides 0.35 °C/W junction-to-mount thermal resistance |
Pinout & Package
DO-218AC package: two-terminal surface-mount device with Lead 1 (anode/cathode-indifferent) and Lead 2 (metal heatsink tab). Polarity is bidirectional; no cathode band marking. Mounting pad layout complies with IPC-7351 standard; thermal pad (Lead 2) must be soldered to PCB copper pour for optimal RθJM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Cathode (bidirectional) | Electrically symmetric terminal; connects to protected line (e.g., battery rail or LIN bus) |
| Lead 2 | Heatsink / Cathode-Anode Common | Exposed metal tab for thermal conduction to PCB; must be soldered to ≥100 mm² copper area for rated RθJM = 0.35 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD47; required for engine bay deployment |
| ISO 7637-2 compliance | Withstands Pulse 5a (load dump) up to 120 V, 350 ms without degradation; eliminates need for external series resistors in basic protection schemes |
| MSL Level 1 rating | Reflow-compatible up to 245 °C peak; supports standard lead-free SMT assembly without moisture sensitivity concerns |
| Halogen-free & RoHS | M3 suffix confirms halogen-free molding compound and matte tin terminations compliant with J-STD-002/JESD22-B102 |
| Junction temp capability | Rated for continuous operation at TJ = 175 °C; enables direct mounting on high-temp PCB zones near power MOSFETs or DC/DC converters |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) LIN Bus Protection |
|---|---|
Use Scenario: Protects 12 V supply input of gasoline/diesel engine ECUs against ISO 7637-2 Pulse 5a load dump transients (up to 120 V, 350 ms). IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point; conducts surge energy to chassis ground via heatsink pad. Use Value: Limits voltage seen by downstream DC/DC regulators and microcontrollers to ≤77.4 V, preventing latch-up or permanent damage during alternator field decay events. | Use Scenario: Shields LIN transceivers and microcontroller GPIOs from coupled transients on shared vehicle harnesses. IC Role / Device Role / Timing Role: Bidirectional shunt protector on LIN signal line (Vbat-referenced); clamps both positive and negative spikes without polarity concern. Use Value: Maintains signal integrity with <10 μA leakage at 12 V, avoiding false wake-up or communication errors in sleep-mode BCM operation. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Rail | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Secures 12 V input to rear-view or surround-view camera modules exposed to harsh under-vehicle environments. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of LDOs and image sensors; handles repetitive switching noise from nearby solenoids and pumps. Use Value: Delivers 6600 W surge capacity and 175 °C operation, ensuring uninterrupted video feed during hot-cranking and stop-start cycles. | Use Scenario: Protects high-side/low-side gate drivers and current sense amplifiers in EPS motor control circuits from inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor phase terminals or supply rails; diverts fast-rising dV/dt spikes (<10 ns rise time) away from sensitive analog front-ends. Use Value: Clamps transients to 77.4 V within nanoseconds, preserving PWM timing accuracy and preventing erroneous overcurrent shutdowns during aggressive steering maneuvers. |
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 | DO-214AC package; lower PPPM (400 W); higher RθJA (95 °C/W); unqualified for AEC-Q101 | Not suitable for under-hood automotive use; limited to consumer or industrial board-level protection | Select only for cost-sensitive non-automotive applications where 175 °C operation and ISO 7637-2 compliance are not required |
| TPSMD48CA | DO-218AC package; same VWM/VC specs; AEC-Q101 qualified; but lower IPPM (75 A vs. 85.3 A) and PPPM (6000 W vs. 6600 W) | Marginally lower surge headroom; may require derating in high-reliability 24 V commercial vehicle systems | Acceptable for passenger car BCMs with moderate surge exposure; verify clamping margin against worst-case load dump profiles |
Compared with SMAJ48A-E3/5A and TPSMD48CA, the SM8S48CAHM3/I offers superior thermal performance (RθJM = 0.35 °C/W), higher surge rating (6600 W), and full AEC-Q101 validation - making it the preferred choice for engine bay and safety-critical automotive power rail protection where sustained high-temperature reliability is mandatory.
Availability
SM8S48CAHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering electronics requiring stable component supply across extended temperature ranges and high-surge environments.
Supply support for SM8S48CAHM3/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, TVS devices, and optoelectronics with emphasis on automotive, industrial, and computing applications.
The SM8SxxCA family is engineered specifically for high-energy automotive transient suppression, delivering AEC-Q101 reliability, ISO 7637-2 compliance, and DO-218AC thermal efficiency to meet stringent under-hood environmental demands.
FAQ
What is the maximum clamping voltage of the SM8S48CAHM3/I during a 10/1000 μs surge event?
The SM8S48CAHM3/I has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current of 85.3 A under a 10/1000 μs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc. #98229) and represents the upper voltage limit imposed on protected circuitry during standardized surge testing. Designers must ensure downstream components tolerate this clamped level.
Is the SM8S48CAHM3/I suitable for 24 V automotive systems?
Yes, the SM8S48CAHM3/I is explicitly designed for 24 V nominal systems. Its 48 V stand-off voltage (VWM) provides appropriate margin above 24 V rail variations, while its 77.4 V clamping voltage remains compatible with 36 V-rated downstream ICs common in commercial vehicle ECUs. The device meets ISO 16750-2 and ISO 7637-2 requirements applicable to 24 V architectures.
Does the SM8S48CAHM3/I require a heatsink on the PCB?
The SM8S48CAHM3/I does not require an external heatsink, but its DO-218AC package mandates soldering Lead 2 (metal heatsink tab) to a minimum 100 mm² copper pour on the PCB to achieve the specified RθJM = 0.35 °C/W. Without this thermal connection, junction temperature rise during surge events will exceed safe limits, risking parametric shift or failure. No additional heatsink hardware is needed if PCB layout follows Vishay's recommended footprint.
How does the HM3 suffix affect the SM8S48CAHM3/I specification?
The HM3 suffix on SM8S48CAHM3/I indicates halogen-free, RoHS-compliant construction (M3), AEC-Q101 qualification (H), and compliance with JESD201 Class 2 whisker resistance. It confirms the device meets automotive reliability standards, including high-temperature storage life, temperature cycling, and mechanical robustness - distinguishing it from industry-grade variants lacking the 'H' prefix.
Can the SM8S48CAHM3/I replace the SM8S43CA in an existing design?
Yes, the SM8S48CAHM3/I can replace the SM8S43CA in most cases, as both share identical DO-218AC packaging, AEC-Q101 qualification, and thermal characteristics. However, the SM8S48CAHM3/I has higher VWM (48 V vs. 43 V) and VC (77.4 V vs. 69.4 V), so designers must verify that downstream components tolerate the elevated clamping voltage and that system overvoltage thresholds align with the new 48 V standoff rating.
SM8S48CAHM3/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):
- 85.3A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S48CAHM3/I FAQ
1.How can I place an order for SM8S48CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S48CAHM3/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 SM8S48CAHM3/I reliable?
The price and inventory of SM8S48CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S48CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S48CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S48CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S48CAHM3/I?
SM8S48CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S48CAHM3/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 SM8S48CAHM3/I?
For technical support, including SM8S48CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S48CAHM3/I requirements.
6.How does Aetrix verify that SM8S48CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S48CAHM3/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 SM8S48CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S48CAHM3/I?
All SM8S48CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S48CAHM3/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 SM8S48CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S48CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S48CAHM3/I Tags
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