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Vishay General Semiconductor - Diodes Division SMAJ9.0A-E3/5A
- Part No.:
- SMAJ9.0A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0A-E3/5A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ9.0A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 9.0 V stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1.0 mA test current, and clamps to ≤15.4 V at 26.0 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ9.0A-E3/5A datasheet, SMAJ9.0A-E3/5A pinout, SMAJ9.0A-E3/5A application, or SMAJ9.0A-E3/5A equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), low 0.074 %/°C VBR temperature coefficient, 5.0 μA max reverse leakage at VWM, and AEC-Q101 qualification eligibility via HE3/HM3 variants - critical for robust overvoltage protection in space-constrained DC power inputs and I/O lines.
Technical Context
This unidirectional TVS operates as a fast-acting shunt clamp: when transient voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, enabling consistent clamping performance across repetitive transients.
Rated for 400 W peak pulse power (10/1000 μs), it delivers 26.0 A IPPM with ≤15.4 V clamping voltage and supports 40 A non-repetitive forward surge (8.3 ms half-sine). Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, limiting steady-state dissipation to 3.3 W at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for normal circuit operation. |
| VBR (min/max) | 10.0 V / 11.1 V at 1.0 mA - Confirmed avalanche onset range; defines minimum clamping threshold under transient stress. |
| VC @ IPPM | ≤15.4 V at 26.0 A - Measured clamping voltage during 10/1000 μs surge; determines maximum voltage seen by downstream components. |
| IPPM | 26.0 A - Peak surge current the device safely handles per pulse; directly tied to system-level surge immunity (e.g., ISO 7637-2 Pulse 1/2a). |
| PPPM | 400 W - Peak pulse power capability below 78 V; enables protection against high-energy transients without thermal runaway. |
| ID @ VWM | ≤5.0 μA - Reverse leakage at rated stand-off voltage; ensures negligible quiescent power loss in always-on protection circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction path during avalanche clamping. |
| Cathode (banded end) | High-side connection point | Connected to protected line (e.g., +12 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against high-energy load dump and inductive switching transients in 12 V automotive systems. |
| 15.4 V clamping voltage at 26 A | Limits voltage stress on 16 V-rated downstream ICs and MOSFETs, preserving reliability without overdesigning margin. |
| 0.074 %/°C VBR tempco | Ensures predictable breakdown shift across -55 °C to +150 °C, critical for stable clamping in wide-temperature applications. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants meet automotive-grade reliability standards for passenger compartment and engine bay use. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping transients within nanoseconds. Use Value: Limits input voltage to ≤15.4 V during 26 A surges, preventing damage to LDOs and microcontrollers without adding series impedance. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface, shunting fast transients before reaching ADC front-end. Use Value: 5.0 μA leakage preserves sensor accuracy; 15.4 V clamping protects 3.3 V/5 V rail-tied op-amps and reference buffers. |
| Consumer USB Power Port Clamp | Telecom DC Feeder Surge Suppression |
|
Use Scenario: Overvoltage protection on 5 V USB-C power delivery inputs susceptible to hot-plug transients and adapter faults. IC Role / Device Role / Timing Role: Standoff-matched TVS (VWM = 9.0 V) placed upstream of USB PD controller, conducting only during overvoltage. Use Value: 10.0–11.1 V VBR ensures no false triggering during 5 V ±5 % tolerance, while 400 W rating absorbs repeated plug-in spikes. |
Use Scenario: Secondary-side surge suppression on -48 V telecom DC feeder lines subject to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS oriented to clamp negative-going transients on return path, paired with positive-side counterpart. Use Value: 150 °C TJ max and 120 °C/W RθJA support sustained operation in sealed outdoor cabinets with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0AHE3_A/I | AEC-Q101 qualified, halogen-free RoHS-compliant, same electrical specs and SMA package. | Required for automotive OEM designs needing certified reliability; identical layout and footprint. | Select when automotive qualification and halogen-free compliance are mandatory; otherwise SMAJ9.0A-E3/5A suffices for commercial/industrial use. |
| SMBJ9.0A-E3/52 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 2.5 mm wider, 0.3 mm taller, 10% higher PPPM (600 W). | Better thermal dissipation and higher surge margin; requires larger PCB pad area and different land pattern. | Choose for higher surge endurance where board space allows; not drop-in - layout revision required. |
Compared with SMAJ9.0AHE3_A/I, the SMAJ9.0A-E3/5A offers identical protection performance without automotive qualification overhead; versus SMBJ9.0A-E3/52, it trades 200 W pulse power for 30% smaller footprint - optimizing space-constrained consumer and telecom modules.
Availability
SMAJ9.0A-E3/5A is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface clamping, and consumer USB power port surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ9.0A-E3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets cost-effective, high-volume transient suppression in automotive, industrial, and communications systems - delivering standardized TVS performance in compact surface-mount packages for automated manufacturing.
FAQ
What is the clamping voltage of the SMAJ9.0A-E3/5A under a 10/1000 μs surge?
The SMAJ9.0A-E3/5A clamps to a maximum of 15.4 V when subjected to its rated 26.0 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024), ensuring predictable overvoltage limiting for downstream 16 V-rated components. The SMAJ9.0A-E3/5A achieves this with low dynamic impedance and fast response time inherent to its glass-passivated junction design.
Is the SMAJ9.0A-E3/5A suitable for automotive applications?
The SMAJ9.0A-E3/5A itself is commercial-grade and RoHS-compliant (E3 suffix), but not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ9.0AHE3_A/I variant - same electrical specs and SMA package - which carries full AEC-Q101 qualification for automotive use. For non-automotive applications like industrial controls or consumer electronics, the SMAJ9.0A-E3/5A provides equivalent protection performance with lower cost and broader availability.
What is the maximum reverse leakage current for SMAJ9.0A-E3/5A at its 9.0 V stand-off voltage?
At the rated stand-off voltage (VWM) of 9.0 V and TA = 25 °C, the SMAJ9.0A-E3/5A exhibits a maximum reverse leakage current (ID) of 5.0 μA. This low leakage ensures minimal power loss and no measurable impact on system efficiency in always-connected protection configurations - such as DC power inputs or sensor bias lines - where quiescent current budget is constrained.
Does SMAJ9.0A-E3/5A have a defined polarity marking, and how is it oriented in circuit?
Yes - the SMAJ9.0A-E3/5A is unidirectional and features a cathode band printed on the SMA (DO-214AC) package body. During normal operation, the banded end (cathode) connects to the protected line (e.g., +12 V), and the anode connects to ground. This orientation ensures reverse-bias operation; the device avalanches only when transient voltage exceeds VBR, shunting surge current safely to ground without affecting forward conduction paths.
What is the thermal resistance and power derating behavior of SMAJ9.0A-E3/5A?
The SMAJ9.0A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on standard 0.2" × 0.2" copper pads. Its steady-state power dissipation is rated at 3.3 W at TA = 50 °C, derating linearly above that temperature. For example, at 100 °C ambient, usable power drops to ~1.65 W. This derating curve is documented in Figure 2 of the Vishay datasheet (88390), and must be applied when estimating long-term reliability under continuous surge exposure.
SMAJ9.0A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ9.0A-E3/5A FAQ
1.How can I place an order for SMAJ9.0A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0A-E3/5A 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 SMAJ9.0A-E3/5A reliable?
The price and inventory of SMAJ9.0A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0A-E3/5A?
SMAJ9.0A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0A-E3/5A 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 SMAJ9.0A-E3/5A?
For technical support, including SMAJ9.0A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0A-E3/5A requirements.
6.How does Aetrix verify that SMAJ9.0A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0A-E3/5A 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 SMAJ9.0A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0A-E3/5A?
All SMAJ9.0A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0A-E3/5A, 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 SMAJ9.0A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ9.0A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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