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Vishay General Semiconductor - Diodes Division SMA5J12AHE3/5A
- Part No.:
- SMA5J12AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12AHE3/5A.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,456
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Product details
Overview
SMA5J12AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on DC power rails and signal lines. It features 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 25.1 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect automotive ECUs, industrial I/O modules, and sensor interfaces against inductive switching transients.
For engineers reviewing the SMA5J12AHE3/5A datasheet, SMA5J12AHE3/5A pinout, SMA5J12AHE3/5A application, or SMA5J12AHE3/5A equivalent, key selection criteria include clamping performance under 25.1 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), RoHS-compliant matte tin plating, 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 cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown and low incremental surge resistance. Its response time is sub-nanosecond, enabling effective suppression of fast-rising ESD and lightning-induced transients.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and supports 40 A non-repetitive forward surge current (IFSM) - critical for surviving repeated load-dump events in 12 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V nominal supply rails. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown range ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 19.9 V at 25.1 A - clamping voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 500 W - peak pulse power handling capability; enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm pads; informs derating above 25 °C ambient. |
| IFSM | 40 A - single half-sine surge rating (8.3 ms); validates survivability in automotive load-dump scenarios. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration. |
| Cathode | Current exit terminal during reverse clamping | Marked with band; connected to protected line (e.g., 12 V rail) to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, body electronics, and ADAS modules. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved moisture resistance vs. epoxy-passivated alternatives - critical for long-term field reliability. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning - eliminates moisture sensitivity handling overhead. |
| Low incremental surge resistance | Minimizes voltage overshoot during high di/dt events - improves clamping precision for sensitive microcontrollers and CAN transceivers. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material - satisfies flammability requirements for enclosed automotive and industrial enclosures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and chassis ground. Use Value: Clamps surges to ≤19.9 V while absorbing 500 W, preventing damage to LDOs, MCUs, and CAN controllers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Point-of-entry TVS on twisted-pair signal lines upstream of instrumentation amplifier inputs. Use Value: Sub-nanosecond response limits voltage excursion to <20 V, preserving ADC accuracy and avoiding latch-up in signal conditioning ICs. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding 12 V/24 V PoE-powered network switches and base stations against lightning-induced surges on DC input lines. IC Role / Device Role / Timing Role: Primary surge suppression stage before bulk capacitance and DC-DC converters. Use Value: Withstands 25.1 A peak current and 500 W pulse energy, reducing need for secondary protection stages. |
Use Scenario: Adding transient immunity to USB VBUS lines in portable speakers, docking stations, and smart home hubs. IC Role / Device Role / Timing Role: Unidirectional clamp between VBUS and GND, sized for 12 V tolerance margin above 5 V nominal. Use Value: 19.9 V clamping prevents overvoltage damage to USB PD controllers and port power switches during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J12A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Not suitable for automotive OEM or Tier 1 applications requiring automotive qualification. | Select SMA5J12AHE3/5A when AEC-Q101 compliance is mandatory; otherwise SMA5J12A-E3/5A offers cost advantage for industrial/commercial use. |
| 1.5SMC12A | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; RθJA = 50 °C/W vs. 80 °C/W; higher IFSM (100 A). | Better thermal performance and surge endurance, but requires larger PCB footprint and may not fit space-constrained layouts. | Choose 1.5SMC12A where board space allows and higher surge margin is needed; SMA5J12AHE3/5A preferred for compact automotive modules. |
Compared with SMA5J12A-E3/5A, the SMA5J12AHE3/5A adds AEC-Q101 validation without electrical trade-offs; versus 1.5SMC12A, it trades thermal margin and surge headroom for 30 % smaller footprint - making it optimal for space-limited, automotive-qualified designs.
Availability
SMA5J12AHE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and telecom DC power input circuits requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant sourcing.
Supply support for SMA5J12AHE3/5A 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 qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained, high-reliability applications - particularly targeting 12 V and 24 V automotive, industrial, and telecom systems exposed to severe electrical transients.
FAQ
What is the clamping voltage of the SMA5J12AHE3/5A under a 25.1 A surge?
The SMA5J12AHE3/5A clamps to a maximum of 19.9 V when subjected to its rated 25.1 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J12AHE3/5A maintains this clamping performance across its full operating temperature range.
Is the SMA5J12AHE3/5A qualified for automotive applications?
Yes, the SMA5J12AHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101-qualified variants. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making the SMA5J12AHE3/5A suitable for under-hood and cabin automotive systems such as body control modules and ADAS sensors.
What is the thermal resistance of the SMA5J12AHE3/5A, and how does it affect layout?
The SMA5J12AHE3/5A 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 standard PCB copper area and influences derating: at 85 °C ambient, the device must be operated below ~390 W peak power to stay within its 150 °C junction limit. Layout must replicate the specified pad dimensions to achieve published thermal performance.
How does the SMA5J12AHE3/5A differ from bidirectional versions like SMA5J12CA?
The SMA5J12AHE3/5A is unidirectional and features polarity marking (cathode band), allowing it to conduct forward current and clamp reverse surges - ideal for DC power rail protection. In contrast, SMA5J12CA is bidirectional, symmetric in both directions, and lacks polarity marking; it is used for AC signal lines or floating buses. Their VWM, VBR, and VC values differ accordingly, and they are not interchangeable without circuit redesign.
What packaging options are available for the SMA5J12AHE3/5A?
The SMA5J12AHE3/5A is supplied in 13" diameter plastic tape and reel format with a base quantity of 7500 pieces, denoted by the "/5A" suffix in the part number. This packaging supports high-speed automated pick-and-place assembly. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance requirements.
SMA5J12AHE3/5A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J12AHE3/5A FAQ
1.How can I place an order for SMA5J12AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12AHE3/5A 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 SMA5J12AHE3/5A reliable?
The price and inventory of SMA5J12AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J12AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J12AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12AHE3/5A?
SMA5J12AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12AHE3/5A 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 SMA5J12AHE3/5A?
For technical support, including SMA5J12AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12AHE3/5A requirements.
6.How does Aetrix verify that SMA5J12AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J12AHE3/5A 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 SMA5J12AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J12AHE3/5A?
All SMA5J12AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12AHE3/5A, 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 SMA5J12AHE3/5A part is unused and in its original packaging.
Return procedure for SMA5J12AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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