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Vishay General Semiconductor - Diodes Division SMAJ9.0A-M3/5A
- Part No.:
- SMAJ9.0A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0A-M3/5A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
SMAJ9.0A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 9.0 V stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA, 15.4 V maximum clamping voltage (VC) at 26.0 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed on power rails and signal lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ9.0A-M3/5A datasheet, SMAJ9.0A-M3/5A pinout, SMAJ9.0A-M3/5A application, or SMAJ9.0A-M3/5A equivalent, key selection criteria include clamping performance under 26 A surge, thermal resistance (RθJA = 120 °C/W), halogen-free RoHS compliance (M3 suffix), unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (10.0–11.1 V), it avalanches rapidly (<1 ns response) to divert surge current away from downstream ICs or MOSFETs. Its low incremental surge resistance ensures minimal voltage overshoot during transient events.
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V; above that threshold, derated to 300 W. It supports continuous power dissipation of 3.3 W at 50 °C ambient and withstands 40 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for both AC-coupled and DC power-line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum steady-state reverse voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 10.0 V / 11.1 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 15.4 V at 26.0 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy handling capacity; defines survivability under standardized lightning/surge tests. |
| ID @ VWM | 5.0 μA - Reverse leakage at stand-off voltage; low value minimizes quiescent power loss and avoids false triggering. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes shunt path for transient energy diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems without derating. |
| 15.4 V clamping voltage at 26 A | Limits voltage seen by downstream 12 V logic or microcontrollers to within safe absolute maximum ratings. |
| Low profile SMA package | 0.208" × 0.157" footprint with 0.090" height - fits dense PCB layouts and supports high-speed automated placement. |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance mandates for automotive and industrial OEMs without compromising surge performance. |
| Fast <1 ns response time | Clamps transients before they propagate through trace inductance, protecting high-speed interfaces like CAN or LIN. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) and body control modules (BCMs) from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and local regulator input to clamp surges above 15.4 V. Use Value: Prevents regulator latch-up or destruction during ISO 16750-2 load dump events (up to 35 V, 100 ms), ensuring functional safety compliance. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) of pressure or temperature sensors in factory automation equipment. IC Role / Device Role / Timing Role: TVS mounted across signal and ground near connector to absorb ESD and cable discharge events. Use Value: Maintains signal integrity by limiting transient-induced offset errors and preventing ADC saturation or op-amp damage. |
| Consumer USB Power Port Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Safeguarding 5 V USB VBUS lines in smart home hubs and set-top boxes against hot-plug ESD and nearby lightning coupling. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBUS and GND, upstream of USB controller's internal protection. Use Value: Absorbs ±15 kV contact ESD (IEC 61000-4-2) without degradation, preserving USB enumeration reliability over product lifetime. |
Use Scenario: Front-end protection of ADSL/VDSL line interface circuits exposed to induced surges on outdoor telephone wiring. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (one per line) referenced to common-mode ground to suppress differential-mode surges. Use Value: Withstands 10/1000 μs surges up to 400 W while maintaining <15.4 V clamping, preventing PHY IC damage and service interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive commercial designs). | Select E3 for cost-sensitive, non-automotive applications; M3 required for automotive AEC-Q101-aligned supply chains. |
| SMBJ9.0A-M3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package (0.236" × 0.157"); same VWM/VBR/VC. | Better suited for higher-energy surges (e.g., 12 V industrial motor drives); requires larger PCB area. | Choose SMBJ9.0A-M3 when surge threat level exceeds 400 W or when design allows larger footprint for enhanced margin. |
Compared with SMAJ9.0A-E3/5A, the SMAJ9.0A-M3/5A adds halogen-free compliance critical for automotive Tier 1 sourcing; versus SMBJ9.0A-M3, it trades 200 W pulse power for 25 % smaller board area-ideal for space-constrained 12 V ECU modules.
Availability
SMAJ9.0A-M3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer USB power ports, and telecom DSL line protection requiring stable component supply and full halogen-free compliance.
Supply support for SMAJ9.0A-M3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where compact size, fast response, and AEC-Q101 qualification matter.
FAQ
What is the clamping voltage of the SMAJ9.0A-M3/5A under a 26 A transient?
The SMAJ9.0A-M3/5A exhibits a maximum clamping voltage (VC) of 15.4 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 26.0 A. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream 12 V components. The SMAJ9.0A-M3/5A maintains this clamping performance across its qualified operating temperature range of –55 °C to +150 °C.
Is the SMAJ9.0A-M3/5A halogen-free and RoHS-compliant?
Yes, the SMAJ9.0A-M3/5A carries the "M3" suffix, indicating it is both halogen-free and RoHS-compliant per EU Directive 2011/65/EU and Vishay's material categorization standard. Its molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability requirements. The SMAJ9.0A-M3/5A is certified to JESD 201 Class 2 whisker resistance.
How does the SMAJ9.0A-M3/5A differ from bidirectional variants like SMAJ9.0CA?
The SMAJ9.0A-M3/5A is unidirectional, featuring a cathode band for polarity identification and conducting only in reverse avalanche mode; SMAJ9.0CA is bidirectional with symmetrical clamping in both directions and no polarity marking. The SMAJ9.0A-M3/5A has lower leakage (5.0 μA at 9.0 V) than SMAJ9.0CA (10 μA at 9.0 V), making it preferable for DC-biased rails. Both share identical VBR, VC, and PPPM ratings.
What is the thermal resistance and maximum power dissipation of the SMAJ9.0A-M3/5A?
The SMAJ9.0A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal, and a junction-to-lead resistance (RθJL) of 30 °C/W. Its steady-state power dissipation (PD) is rated at 3.3 W at TA = 50 °C. These values define safe continuous operation limits and inform thermal pad design for long-term reliability in enclosed enclosures or high-ambient environments.
Can the SMAJ9.0A-M3/5A be used in automotive applications requiring AEC-Q101 qualification?
No-the SMAJ9.0A-M3/5A is commercial-grade and not AEC-Q101 qualified. For automotive use, select the AEC-Q101 qualified variant SMAJ9.0AHM3_A/I (halogen-free, RoHS-compliant, and AEC-Q101 tested), which shares identical electrical characteristics but undergoes extended stress testing per JESD22-A108. The SMAJ9.0A-M3/5A remains suitable for non-safety-critical industrial or consumer applications where qualification is not mandated.
SMAJ9.0A-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ9.0A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0A-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ9.0A-M3/5A 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-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0A-M3/5A?
SMAJ9.0A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0A-M3/5A 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-M3/5A?
For technical support, including SMAJ9.0A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0A-M3/5A requirements.
6.How does Aetrix verify that SMAJ9.0A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0A-M3/5A?
All SMAJ9.0A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ9.0A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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