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Vishay General Semiconductor - Diodes Division SM5S70CAHM3/I
- Part No.:
- SM5S70CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S70CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S70CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR), 113 V maximum clamping voltage (VC) at 31.9 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). Rated for TJ = 175 °C and AEC-Q101 qualified, it is used in 12 V/24 V automotive power rails to protect ECUs and body control modules.
For engineers reviewing the SM5S70CAHM3/I datasheet, SM5S70CAHM3/I pinout, SM5S70CAHM3/I application, or SM5S70CAHM3/I equivalent, this page delivers verified electrical parameters, DO-218AC package details, ISO 7637-2 compliance evidence, thermal resistance values (RθJA = 65 °C/W), and direct alternatives with documented clamping and surge capability differences.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>100 MΩ at VWM), but triggers into low-impedance conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤113 V during 10/1000 µs surges up to 3600 W. Its bidirectional symmetry enables use without polarity concern in DC systems subject to reverse transients.
Thermal design relies on its low junction-to-mount thermal resistance (RθJM = 0.45 °C/W) and DO-218AC metal-heatsink lead frame, enabling effective heat transfer to PCB copper pour or chassis. The device sustains 5 W steady-state dissipation at TA = 25 °C and derates linearly above that ambient per JEDEC 51-2A mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA; defines safe DC rail margin for 24 V automotive systems. |
| VBR (min/typ/max) | 77.8 / 81.9 / 86.0 V - Measured at 5 mA; ensures reliable triggering above nominal system overvoltage while avoiding false trips. |
| VC @ IPPM | 113 V at 31.9 A - Clamping voltage during 10/1000 µs surge; determines maximum stress imposed on protected ICs like CAN transceivers or microcontrollers. |
| PPPM (10/1000 µs) | 3600 W - Peak surge power handling capacity; supports ISO 7637-2 Pulse 5a (load dump) testing up to 120 V, 100 ms duration. |
| TJ max. | +175 °C - Enables operation in engine bay environments; validated per AEC-Q101 stress test conditions including temperature cycling and HTRB. |
| RθJA | 65 °C/W - Thermal resistance from junction to ambient on standard FR4 PCB; informs minimum copper area required for 5 W continuous dissipation. |
| Polarity | Bidirectional - No cathode marking; symmetric clamping for positive/negative transients; simplifies layout in unipolar DC systems. |
Pinout & Package
Package: DO-218AC - Surface-mount, molded plastic case with exposed metal heatsink pad (Lead 2), UL 94 V-0 rated, halogen-free, RoHS-compliant, and AEC-Q101 qualified. Dimensions: 6.28 × 5.00 × 3.00 mm (L × W × H); leads matte tin-plated, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode (bidirectional terminal) | Connected to protected line (e.g., battery rail); forms one side of symmetrical avalanche junction. |
| Lead 2 / Metal Heatsink | Cathode / Thermal Pad | Primary thermal path to PCB copper; must be soldered to ≥1 cm² thermal pad for RθJA compliance; electrically connected to cathode side of junction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use: 1000h HTOL at 175 °C, 1000-cycle temperature cycling (-55 °C to +175 °C), and unbiased HAST. |
| ISO 7637-2 compliance | Meets Pulse 5a (load dump) requirements up to 120 V, 100 ms; clamping performance verified across full temperature range (-55 °C to +175 °C). |
| Low leakage at VWM | ≤10 µA at 70 V and 25 °C; reduces quiescent current drain in always-on vehicle networks (e.g., LIN, CAN standby). |
| MSL Level 1 rating | Rated for reflow up to 245 °C peak; no floor life limitation; compatible with standard SMT assembly without dry pack or baking. |
| Junction-to-mount thermal path | RθJM = 0.45 °C/W - Enables >80% of surge energy to dissipate through metal heatsink pad into PCB ground plane, minimizing junction temperature rise. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protects BCM microcontroller and CAN transceiver inputs from alternator load dump transients during battery disconnect events. IC Role / Device Role: Shunt clamping TVS placed between battery rail and local DC/DC input, triggered only during >77.8 V excursions. Use Value: Limits voltage to ≤113 V during 3600 W surges, preventing latch-up or gate oxide damage in 5 V/3.3 V logic supplies downstream. |
Use Scenario: Shields ECU main 12 V input against ISO 16750-2 Pulse 5b (alternator switching) and coupled lightning-induced spikes. IC Role / Device Role: Primary overvoltage clamp upstream of input filter and LDO regulators; bidirectional operation handles negative transients from relay coil flyback. Use Value: Withstands 175 °C junction temperature and maintains <10 µA leakage at 70 V, ensuring reliability in high-ambient under-hood environments. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Guards image sensor and serializer ICs in rear-view cameras from battery line transients during jump-start or cold-cranking. IC Role / Device Role: Secondary protection stage after fuse and common-mode choke; clamps fast-rising spikes (<100 ns) before they reach sensitive analog front-ends. Use Value: 113 V clamping voltage ensures headroom below absolute maximum ratings of 120 V-rated imaging SoCs, preserving signal integrity and MTBF. |
Use Scenario: Protects H-bridge gate drivers and current sense amplifiers in EPS motor control units from inductive kickback during MOSFET switching. IC Role / Device Role: Bidirectional clamp across motor supply rail (VDD_MOTOR); absorbs both positive load dump and negative flyback energy. Use Value: 31.9 A peak pulse current rating and 2400 W (10/10,000 µs) capability handle sustained motor stall surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70A | Unidirectional; VWM = 70 V, VC = 115 V @ 31.2 A; same DO-214AC package but no metal heatsink pad. | Requires polarity-aware layout; lower thermal performance (RθJA ≈ 90 °C/W) limits sustained surge duty cycle. | Select when cost sensitivity outweighs thermal margin needs and polarity can be guaranteed in production. |
| ON Semiconductor SMA6J70A | Unidirectional; VWM = 70 V, VC = 113 V @ 31.5 A; DO-214AC package; AEC-Q101 qualified but no ISO 7637-2 test documentation cited. | Lacks published ISO 7637-2 Pulse 5a validation; suitable for non-automotive industrial 24 V systems with lower surge severity. | Choose for industrial control panels where automotive-grade surge certification is not mandated. |
Compared with SM5S70CAHM3/I, SMAJ70A offers lower cost but sacrifices thermal robustness and bidirectionality, while SMA6J70A matches clamping performance but lacks documented automotive surge compliance-making SM5S70CAHM3/I the only option with verified DO-218AC heatsink integration, bidirectional operation, and ISO 7637-2 Pulse 5a validation.
Availability
SM5S70CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and ADAS camera modules requiring stable component supply with AEC-Q101 qualification and high-temperature reliability.
Supply support for SM5S70CAHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM5SxxCA family was engineered specifically for automotive load dump protection, combining DO-218AC thermal efficiency, AEC-Q101 stress validation, and PAR® technology for consistent clamping across temperature and surge repetition.
FAQ
What is the maximum clamping voltage of SM5S70CAHM3/I under a 10/1000 µs surge?
The SM5S70CAHM3/I exhibits a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 31.9 A using the standardized 10/1000 µs waveform. This value is measured per Figure 4 in the official Vishay datasheet (Doc. #98458) and defines the upper voltage limit imposed on protected circuitry during worst-case transients such as ISO 7637-2 Pulse 5a load dump events. The SM5S70CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SM5S70CAHM3/I suitable for 24 V automotive systems?
Yes, the SM5S70CAHM3/I is explicitly designed for 24 V automotive applications. Its 70 V stand-off voltage (VWM) provides adequate margin above nominal 24 V rail (typically 27–28 V during charging), while its 77.8–86.0 V breakdown range ensures reliable activation during load dump events exceeding 120 V. AEC-Q101 qualification, ISO 7637-2 compliance, and 175 °C junction rating confirm suitability for under-hood deployment in commercial and heavy-duty vehicles using 24 V architectures.
Does SM5S70CAHM3/I have a cathode marking?
No, the SM5S70CAHM3/I is a bidirectional TVS diode and carries no cathode band or polarity marking. Its DO-218AC package features symmetric terminals (Lead 1 and Lead 2/Metal Heatsink), and the device clamps equally for positive and negative voltage excursions beyond its breakdown threshold. This eliminates orientation concerns during placement and simplifies PCB layout for DC systems where reverse transients may occur, such as those induced by relay coil flyback or alternator field collapse.
What is the thermal resistance from junction to ambient (RθJA) for SM5S70CAHM3/I?
The SM5S70CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 65 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A guidelines using the recommended minimum pad layout. This value assumes 2 oz. copper and the specified footprint; actual RθJA will improve with larger thermal pads or internal copper planes. For high-power surge scenarios, the lower junction-to-mount resistance (RθJM = 0.45 °C/W) should be leveraged by soldering the metal heatsink pad (Lead 2) directly to a substantial copper pour.
How does SM5S70CAHM3/I differ from the SM5S70A variant?
The SM5S70CAHM3/I is bidirectional (indicated by "CA"), whereas SM5S70A is unidirectional ("A"). The "HM3" suffix denotes halogen-free, RoHS-compliant, AEC-Q101-qualified construction with JESD 201 Class 2 whisker resistance, while the "/I" indicates tape-and-reel packaging (750 units per 13″ reel, anode toward sprocket hole). Electrically, SM5S70CAHM3/I has identical VWM, VBR, and VC specs to SM5S70A but supports symmetrical transient suppression without polarity constraints-critical for automotive applications with mixed-polarity noise sources.
SM5S70CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 31.9A
- Power - Peak Pulse:
- 2400W (2.4kW)
- 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
SM5S70CAHM3/I FAQ
1.How can I place an order for SM5S70CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S70CAHM3/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 SM5S70CAHM3/I reliable?
The price and inventory of SM5S70CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S70CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S70CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S70CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S70CAHM3/I?
SM5S70CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S70CAHM3/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 SM5S70CAHM3/I?
For technical support, including SM5S70CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S70CAHM3/I requirements.
6.How does Aetrix verify that SM5S70CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S70CAHM3/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 SM5S70CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S70CAHM3/I?
All SM5S70CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S70CAHM3/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 SM5S70CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S70CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S70CAHM3/I Tags
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