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Vishay General Semiconductor - Diodes Division SMA5J8.5AHM3/I
- Part No.:
- SMA5J8.5AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J8.5AHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,604
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Product details
Overview
SMA5J8.5AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 34.7 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J8.5AHM3/I datasheet, SMA5J8.5AHM3/I pinout, SMA5J8.5AHM3/I application, or SMA5J8.5AHM3/I equivalent, key selection criteria include clamping performance under 34.7 A surge, thermal resistance (RθJA = 80 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with glass-passivated junction and low incremental surge resistance, enabling fast response to transients induced by inductive load switching or ESD events. Its 150 °C maximum junction temperature and MSL Level 1 rating support reflow soldering up to 260 °C peak.
The SMA5J8.5AHM3/I exhibits 1.0 μA max reverse leakage at 8.5 V, 14.4 V clamping voltage at rated IPPM, and thermal impedance optimized for surface-mount PCB layouts using minimum recommended pad dimensions per DO-214AC outline - critical for sustained surge handling in automotive ECUs and industrial motor drives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; sets threshold for protection of 9 V rail systems. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - verified breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 14.4 V at 34.7 A - clamping voltage limits downstream component stress during 10/1000 μs surge events. |
| PPPM | 500 W - peak pulse power rating defines energy absorption capability for transient suppression per IEC 61000-4-5. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance determines derating above 25 °C ambient for sustained reliability. |
| TJ max. | 150 °C - maximum junction temperature enables operation in under-hood automotive environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; polarity indicated by cathode band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected circuit ground or low-side return path; must be routed with minimal inductance. |
| Cathode | Reverse-biased clamping node | Connected to line being protected (e.g., 12 V supply rail); cathode band marks this terminal on package. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JESD22-A108. |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-20E for green manufacturing and end-of-life compliance. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Provides stable VBR over lifetime and improved resistance to humidity-induced parameter drift. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed control modules against load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and ground to shunt surge energy away from DC-DC converters and microcontrollers. Use Value: Clamps 34.7 A surges to ≤14.4 V, preserving integrity of 16 V-rated input stages while meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA loop or 0–10 V signal line, absorbing ESD and field-wiring transients. Use Value: 1.0 μA leakage at 8.5 V avoids signal offset errors; 14.4 V clamping prevents ADC saturation during 1 kV contact ESD events. |
| Consumer Power Adapter Input Stage | Telecom DC Power Distribution |
Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters with 9 V PPS output rails. IC Role / Device Role / Timing Role: Fast-response clamping diode across output capacitor to limit fault voltage during regulator failure or cable short. Use Value: 500 W PPPM handles worst-case fault energy; 80 °C/W RθJA allows thermal design margin on compact 2-layer PCBs. |
Use Scenario: Surge suppression on -48 V DC distribution boards in base station power shelves. IC Role / Device Role / Timing Role: Unidirectional TVS on feed line upstream of hot-swap controllers and DC-DC modules. Use Value: 150 °C TJ max supports operation in sealed enclosures; HM3 suffix ensures compliance with telecom environmental standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J8.5AHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification; AEC-Q101 qualified (HE3 suffix). | Preferred for non-automotive commercial designs where halogen content is unrestricted but automotive qualification is needed. | Select when AEC-Q101 is required but halogen-free material is not mandated by OEM or regulatory body. |
| SMA6J8.5A-M3 | 600 W PPPM rating (vs. 500 W), same VWM/VBR/VC, larger SMA package variant (DO-214AC same footprint but higher surge margin). | Better suited for higher-energy transients (e.g., ISO 16750-2 long-duration surges) where 20 % extra power headroom improves margin. | Choose when system-level testing shows marginal clamping margin with SMA5J8.5AHM3/I and layout space permits same-footprint upgrade. |
Compared with SMA5J8.5AHM3/I, SMA5J8.5AHE3/I offers identical surge performance with AEC-Q101 qualification but lacks halogen-free assurance, while SMA6J8.5A-M3 provides 20 % higher peak power handling in the same footprint - enabling design margin extension without PCB revision.
Availability
SMA5J8.5AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, and telecom DC power distribution requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMA5J8.5AHM3/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 reliability and application-specific performance.
The SMA5J series was developed for high-power-density transient suppression in space-constrained automotive and industrial applications, combining AEC-Q101 qualification, halogen-free compliance, and robust 10/1000 μs surge capability in DO-214AC packaging.
FAQ
What is the clamping voltage of the SMA5J8.5AHM3/I under maximum rated surge current?
The SMA5J8.5AHM3/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 34.7 A with a 10/1000 μs waveform. This value is measured per standard test conditions defined in ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping behavior ensures protected circuits remain below critical voltage thresholds during surge events.
Is the SMA5J8.5AHM3/I qualified for automotive applications?
Yes, the SMA5J8.5AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes stress testing including high-temperature reverse bias, temperature cycling, and surge endurance per JESD22 and AEC standards - making it suitable for engine control, body electronics, and ADAS power domains.
What does the "HM3" suffix mean in SMA5J8.5AHM3/I?
The "HM3" suffix in SMA5J8.5AHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from commercial-grade variants (E3/M3) and confirms compliance with JEDEC J-STD-20E for moisture sensitivity level 1 and JESD201 class 2 whisker resistance - critical for automotive and industrial reflow processes.
Can SMA5J8.5AHM3/I be used in bidirectional configurations?
No, SMA5J8.5AHM3/I is a unidirectional TVS diode, as confirmed by its "A" suffix and cathode band marking. Bidirectional versions use the "CA" suffix (e.g., SMA5J8.5CA). Using SMA5J8.5AHM3/I in reverse-biased AC applications would result in forward conduction and potential failure; always verify polarity during PCB layout and schematic capture.
What is the thermal resistance and how does it affect layout for SMA5J8.5AHM3/I?
The SMA5J8.5AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per DO-214AC mechanical drawing; reducing pad area increases RθJA and requires derating per Figure 2 in the datasheet to maintain 150 °C TJ max under repeated surge conditions.
SMA5J8.5AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 34.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J8.5AHM3/I FAQ
1.How can I place an order for SMA5J8.5AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J8.5AHM3/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 SMA5J8.5AHM3/I reliable?
The price and inventory of SMA5J8.5AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J8.5AHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J8.5AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J8.5AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J8.5AHM3/I?
SMA5J8.5AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J8.5AHM3/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 SMA5J8.5AHM3/I?
For technical support, including SMA5J8.5AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J8.5AHM3/I requirements.
6.How does Aetrix verify that SMA5J8.5AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J8.5AHM3/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 SMA5J8.5AHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J8.5AHM3/I?
All SMA5J8.5AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J8.5AHM3/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 SMA5J8.5AHM3/I part is unused and in its original packaging.
Return procedure for SMA5J8.5AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J8.5AHM3/I Tags
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