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Vishay General Semiconductor - Diodes Division SMA5J12AHM3/H
- Part No.:
- SMA5J12AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12AHM3/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,851
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Product details
Overview
SMA5J12AHM3/H from Vishay General Semiconductor is a unidirectional 500 W Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, featuring 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), 19.9 V clamping voltage (VC) at 25.1 A peak pulse current, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMA5J12AHM3/H datasheet, SMA5J12AHM3/H pinout, SMA5J12AHM3/H application, or SMA5J12AHM3/H equivalent, this part delivers verified surge protection for 12 V power rails in automotive ECUs, industrial sensor interfaces, and DC-DC converter inputs where low clamping voltage, high surge robustness, and halogen-free RoHS compliance are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with a glass-passivated junction and fast response to transients ≤1 ns. Its thermal resistance (RθJA = 80 °C/W) and maximum junction temperature of 150 °C support reliable operation under repeated surge stress on standard PCB copper pads.
The SMA5J12AHM3/H exhibits 1.0 μA max reverse leakage at 12 V, 25.1 A peak pulse current (10/1000 μs waveform), and 500 W peak pulse power rating - all validated per ANSI/IEEE C62.35 and tested per JESD22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12 V rail protection. |
| VBR (min/max) | 13.3 V / 14.7 V - Verified breakdown range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 19.9 V - Clamping voltage at 25.1 A peak pulse; limits downstream IC stress during ISO 7637-2 Pulse 1/2a/5a events. |
| PPPM | 500 W - Peak pulse power handling (10/1000 μs); supports automotive load-dump immunity up to SAE J1113-11 Level IV. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood environments without derating below 125 °C ambient. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.0 mm × 5.0 mm copper pad footprint; compatible with automated reflow assembly. |
| Qualification | AEC-Q101 qualified (HM3 suffix) - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case with matte tin-plated leads; cathode indicated by band at one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Connected to GND or low-impedance return path; must be routed with minimal inductance to maintain clamping efficacy. |
| Cathode (banded end) | High-side connection to protected line (e.g., 12 V rail) | Reverse-biased during normal operation; conducts only during overvoltage events to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL level 1 (260 °C peak reflow), enabling green manufacturing compliance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 16750-2 ignition pulses), improving system-level EMI margin. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 μA) over 15-year automotive service life and extended temperature cycling. |
| AEC-Q101 qualification (HM3) | Validated for automotive applications including engine control modules, body electronics, and ADAS power supplies. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to downstream 24 V tolerant regulators and microcontrollers. |
Use Scenario: Safeguarding analog sensor signal lines (e.g., 4–20 mA loop, CAN PHY) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point to suppress ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity with <1.0 μA leakage at 12 V, avoiding offset errors in precision current-loop receivers. |
| DC-DC Converter Input Protection | Telecom Power Supply Clamp |
Use Scenario: Guarding buck converter inputs in PoE-powered devices against surges induced by cable hot-plug or lightning-induced coupling. IC Role / Device Role / Timing Role: Primary surge suppression element upstream of input filter capacitor and controller IC. Use Value: Absorbs 500 W peak energy without degradation, preserving converter startup behavior after repeated 10/1000 μs surges. |
Use Scenario: Clamping 48 V telecom power feeds (e.g., -48 V DC plant) against lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to -48 V rail and anode to chassis ground. Use Value: Delivers 25.1 A surge current handling at 19.9 V clamping, meeting Telcordia GR-1089-CORE Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J12AHE3/H | Same electrical specs, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses E3 suffix instead of HM3. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMA5J12AHE3/H when cost sensitivity outweighs automotive reliability requirements and halogen-free is not mandatory. |
| SMCJ12A-H | Higher power rating (1500 W), larger SMC (DO-214AB) package; VC = 19.9 V same, but IPPM = 75.5 A. | Requires larger PCB footprint and higher thermal mass; better suited for systems with >1 kV surge exposure. | Choose SMCJ12A-H only if 500 W is insufficient and board space allows SMC package; otherwise SMA5J12AHM3/H offers optimal power-density tradeoff. |
Compared with SMA5J12AHE3/H, the SMA5J12AHM3/H adds halogen-free composition and AEC-Q101 validation without sacrificing clamping performance; versus SMCJ12A-H, it trades absolute surge capacity for compact size and lower thermal resistance in constrained layouts.
Availability
SMA5J12AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and DC-DC converter inputs requiring stable component supply with halogen-free, AEC-Q101-qualified surge protection.
Supply support for SMA5J12AHM3/H 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 reliability, power density, and automotive-grade qualification.
The SMA5J series is designed specifically for high-energy transient suppression in space-constrained 12 V–48 V systems, combining low-profile packaging with industry-leading clamping ratio and AEC-Q101 validation.
FAQ
What is the clamping voltage of the SMA5J12AHM3/H at its rated peak pulse current?
The SMA5J12AHM3/H has a maximum clamping voltage (VC) of 19.9 V at 25.1 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured and guaranteed per the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream 24 V tolerant ICs in the SMA5J12AHM3/H-protected circuit.
Is the SMA5J12AHM3/H suitable for automotive applications?
Yes, the SMA5J12AHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability testing. It is explicitly intended for use in engine control modules, body electronics, and ADAS power supplies where sustained operation at +125 °C ambient and immunity to load dump transients are required - all validated for the SMA5J12AHM3/H.
What does the "HM3" suffix mean in SMA5J12AHM3/H?
The "HM3" suffix in SMA5J12AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3) and confirms compliance with JESD201 Class 2 whisker resistance, MSL level 1 reflow capability, and automotive reliability stress testing - all documented for the SMA5J12AHM3/H in Vishay's official datasheet.
How does the SMA5J12AHM3/H compare to bidirectional TVS diodes like SMA5J12CA?
The SMA5J12AHM3/H is unidirectional and intended for DC rail protection where polarity is fixed, offering lower leakage (<1.0 μA at 12 V) and no reverse conduction path. In contrast, SMA5J12CA is bidirectional with symmetrical clamping in both directions but higher leakage and no cathode marking - making SMA5J12AHM3/H preferable for 12 V supply line protection where reverse voltage is absent and leakage sensitivity matters.
What is the thermal resistance of the SMA5J12AHM3/H, and how does it affect layout?
The SMA5J12AHM3/H 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 requires adherence to Vishay's recommended pad layout to avoid thermal runaway during repetitive surge events; reducing pad area increases RθJA, directly degrading the SMA5J12AHM3/H's ability to dissipate 500 W peak power safely.
SMA5J12AHM3/H 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- 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)
SMA5J12AHM3/H FAQ
1.How can I place an order for SMA5J12AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12AHM3/H 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 SMA5J12AHM3/H reliable?
The price and inventory of SMA5J12AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J12AHM3/H is usually 5 days.
3.What payment methods are accepted for SMA5J12AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12AHM3/H?
SMA5J12AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12AHM3/H 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 SMA5J12AHM3/H?
For technical support, including SMA5J12AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12AHM3/H requirements.
6.How does Aetrix verify that SMA5J12AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J12AHM3/H 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 SMA5J12AHM3/H meets industry standards.
7.What is the process for return or replacement of SMA5J12AHM3/H?
All SMA5J12AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12AHM3/H, 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 SMA5J12AHM3/H part is unused and in its original packaging.
Return procedure for SMA5J12AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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