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Vishay General Semiconductor - Diodes Division SMAJ9.0AHE3/5A
- Part No.:
- SMAJ9.0AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0AHE3/5A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,652
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Product details
Overview
SMAJ9.0AHE3/5A 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 voltage transients induced by inductive load switching and lightning surges. It features a 9.0 V stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA test current, 15.4 V maximum clamping voltage (VC) at 26.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ9.0AHE3/5A datasheet, SMAJ9.0AHE3/5A pinout, SMAJ9.0AHE3/5A application, or SMAJ9.0AHE3/5A equivalent, this device is selected for robust overvoltage protection on DC power rails and low-voltage signal lines in automotive ECUs, industrial I/O modules, and sensor interface circuits where AEC-Q101 qualification, low clamping ratio, and fast response time are critical.
Technical Context
The SMAJ9.0AHE3/5A operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to clamp transient energy into the PCB ground plane. Its glass-passivated junction ensures stable VBR tolerance (±10%) and low incremental surge resistance, enabling consistent clamping performance across repetitive transients.
With a thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), it supports reliable operation up to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101, confirming suitability for automotive under-hood and chassis-mounted applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 12 V systems. |
| VBR (min/max) | 10.0 V / 11.1 V at 1 mA - Confirmed breakdown range ensures predictable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 15.4 V at 26.0 A - Clamping voltage limits downstream IC stress to safe levels during 400 W transient events. |
| PPPM | 400 W (10/1000 μs) - Peak pulse power handling capacity validated for standard lightning and EFT surge waveforms. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current rating supports protection against high-energy inductive kickback in relay/motor drive circuits. |
| TJ max | +150 °C - Enables deployment in high-temperature environments such as engine control units and power converters. |
| Package | SMA (DO-214AC) - Standardized surface-mount footprint compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path terminal | Connected to system ground or lower-potential node; completes conduction path during reverse transient clamping. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or signal trace); initiates avalanche breakdown when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| 400 W peak pulse power | Clamps 10/1000 μs transients without degradation-meets ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 Level 3 requirements. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in downstream MOSFETs and ICs. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free soldering without moisture-induced popcorn failure or delamination. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current under thermal and humidity stress. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to shunt transients exceeding 9.0 V while remaining non-conductive during nominal operation. Use Value: Limits clamped voltage to 15.4 V, ensuring MCU supply stays within absolute maximum ratings even during 400 W surge events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge in factory floor sensors. IC Role / Device Role / Timing Role: TVS connected in parallel with signal line and return, clamping fast-rising transients before they reach precision DAC or op-amp inputs. Use Value: Sub-1 ns response time and 15.4 V clamping prevent input-stage saturation or damage in instrumentation amplifiers. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Adding secondary overvoltage protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch to absorb hot-plug spikes and nearby ESD events. Use Value: 9.0 V VWM allows full 5 V USB operation while clamping 15 kV contact ESD to <16 V, preserving port functionality. |
Use Scenario: Front-end protection for Ethernet PHY interfaces in DSLAM line cards exposed to lightning-induced surges on copper pairs. IC Role / Device Role / Timing Role: Unidirectional TVS used in conjunction with gas discharge tubes to handle multi-staged surge energy diversion. Use Value: 400 W pulse rating and 15.4 V clamping enable coordination with upstream GDTs to meet GR-1089-CORE Level 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Not approved for automotive production; suitable for consumer or industrial prototypes where qualification is not mandated. | Select when cost sensitivity outweighs automotive compliance requirements and lifecycle assurance is not required. |
| SMBJ9.0AHE3/5A | Same VWM, VBR, VC, but SMB (DO-214AA) package: 2.54 mm lead pitch vs. SMA's 2.29 mm; 600 W PPPM rating. | Higher power handling enables use in higher-energy surge environments; larger footprint may require PCB redesign. | Choose when system-level surge tests exceed 400 W or when thermal margin must be increased via lower RθJA (85 °C/W). |
Compared with SMAJ9.0AHE3/5A, the SMAJ9.0A-E3/5A offers identical protection performance without automotive qualification, while SMBJ9.0AHE3/5A trades smaller footprint for higher surge capacity and different thermal behavior-requiring layout review but enabling more robust front-end defense.
Availability
SMAJ9.0AHE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom line card designs requiring stable component supply with AEC-Q101 validation and RoHS compliance.
Supply support for SMAJ9.0AHE3/5A 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 optimization.
The SMAJ series was engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure-balancing compact size, AEC-Q101 compliance, and repeatable clamping performance under real-world surge conditions.
FAQ
What is the clamping voltage of SMAJ9.0AHE3/5A at its rated peak pulse current?
The SMAJ9.0AHE3/5A has a maximum clamping voltage (VC) of 15.4 V at its rated peak pulse current (IPPM) of 26.0 A, measured using the standardized 10/1000 μs double-exponential waveform. This value ensures that protected circuitry sees no more than 15.4 V during a 400 W transient event, making SMAJ9.0AHE3/5A appropriate for safeguarding 12 V systems with tight voltage margins. The clamping performance is guaranteed across the full operating temperature range.
Is SMAJ9.0AHE3/5A suitable for automotive applications?
Yes, SMAJ9.0AHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix, indicating RoHS-compliant and AEC-Q101-qualified construction. It undergoes rigorous stress testing-including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing-to ensure reliability in under-hood and chassis-mounted environments. Engineers specify SMAJ9.0AHE3/5A for ECU, ADAS camera module, and infotainment power rail protection where qualification is mandatory.
How does the SMAJ9.0AHE3/5A differ from bidirectional variants like SMAJ9.0CA?
The SMAJ9.0AHE3/5A is unidirectional, meaning it conducts only in reverse bias and requires correct polarity placement (cathode toward the protected line). In contrast, SMAJ9.0CA is bidirectional and symmetrical, providing clamping in both directions-ideal for AC-coupled or differential signal lines. SMAJ9.0AHE3/5A offers tighter VBR tolerance and lower leakage at VWM, while SMAJ9.0CA doubles the maximum reverse leakage (ID) limit per specification note (3). Polarity marking is present on SMAJ9.0AHE3/5A but absent on SMAJ9.0CA.
What is the thermal resistance of SMAJ9.0AHE3/5A, and how does it affect PCB layout?
SMAJ9.0AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures under repeated surge duty, designers should maximize copper area connected to both anode and cathode pads and avoid narrow traces. The SMA package's low profile supports dense layouts, but thermal relief must be balanced against surge current path inductance-especially in high-di/dt applications.
Can SMAJ9.0AHE3/5A be used in place of SMAJ8.5A or SMAJ10A in existing designs?
SMAJ9.0AHE3/5A is not a direct drop-in replacement for SMAJ8.5A or SMAJ10A due to differences in VWM (9.0 V vs. 8.5 V or 10 V) and corresponding VBR ranges, which affect clamping onset timing and system margin. While all share the same SMA package and pinout, substituting requires verification that the 9.0 V standoff aligns with the protected circuit's operating voltage and transient immunity thresholds. For example, replacing SMAJ10A (VWM = 10 V) with SMAJ9.0AHE3/5A may cause nuisance clamping in 12 V systems with high ripple.
SMAJ9.0AHE3/5A 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ9.0AHE3/5A FAQ
1.How can I place an order for SMAJ9.0AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0AHE3/5A 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 SMAJ9.0AHE3/5A reliable?
The price and inventory of SMAJ9.0AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0AHE3/5A?
SMAJ9.0AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0AHE3/5A 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 SMAJ9.0AHE3/5A?
For technical support, including SMAJ9.0AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0AHE3/5A requirements.
6.How does Aetrix verify that SMAJ9.0AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0AHE3/5A 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 SMAJ9.0AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0AHE3/5A?
All SMAJ9.0AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0AHE3/5A, 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 SMAJ9.0AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ9.0AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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