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Vishay General Semiconductor - Diodes Division SMAJ22AHE3_A/I
- Part No.:
- SMAJ22AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHE3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,177
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Product details
Overview
SMAJ22AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on power and signal lines. It features a 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ22AHE3_A/I datasheet, SMAJ22AHE3_A/I pinout, SMAJ22AHE3_A/I application, or SMAJ22AHE3_A/I equivalent, this AEC-Q101 qualified TVS offers verified surge immunity for 12 V/24 V DC systems, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive ECU and ADAS sensor protection designs.
Technical Context
This unidirectional TVS operates by avalanche breakdown above its VBR threshold, delivering sub-nanosecond response to ESD and lightning-induced surges. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance across -55 °C to +150 °C operating range.
The device is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits 0.096 %/°C temperature coefficient of VBR, enabling predictable overvoltage protection in thermally varying environments such as engine control modules and battery management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping begins; sets system-level DC rail compatibility for 12 V/24 V automotive electronics. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on behavior across production lots and temperature. |
| VC @ IPPM | 35.5 V at 11.3 A - clamped voltage during 10/1000 μs surge; limits downstream component stress below 40 V absolute maximum ratings. |
| PPPM | 400 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity testing. |
| IFSM | 40 A - 8.3 ms half-sine surge current rating; protects against load dump events in vehicle electrical systems. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood environments without derating. |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VWM exceeded - must be routed with low-inductance path to chassis or power ground. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; defines clamping reference point and determines unidirectional polarity orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - required for ECUs, body controllers, and ADAS sensors. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 surge test profiles up to Level 3 without degradation - eliminates need for external series impedance in many 12 V supply protection schemes. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during transients - preserves margin for 3.3 V/5 V logic inputs and gate drivers connected to protected lines. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without pre-baking - reduces manufacturing complexity and cost. |
| Glass-passivated junction | Ensures stable leakage current (<1.0 μA at VWM) and long-term parameter stability under humidity and thermal stress. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between VBAT and local regulator input, conducting surge energy to chassis ground within <1 ns. Use Value: Limits voltage seen by downstream LDOs and MCUs to ≤35.5 V during 100 V/500 ms load dump events - preventing latch-up and permanent damage. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Reverse-biased TVS across signal and return lines, absorbing inductive kickback from solenoid actuation and EFT bursts. Use Value: Maintains signal integrity by clamping transients to <35.5 V while adding <1.0 μA leakage - no impact on 24 V loop compliance or measurement accuracy. |
| DC-DC Converter Input Protection | Automotive Camera Module ESD Protection |
|
Use Scenario: Safeguarding buck converter input stages in ADAS domain controllers exposed to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of input filter capacitor, shunting surge current before it reaches switching FETs and controller ICs. Use Value: Withstands 400 W pulses without parameter shift - extends converter lifetime and avoids field failures due to repeated surge exposure. |
Use Scenario: Protecting MIPI CSI-2 data lines and power rails of rear-view camera modules subjected to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF typical) placed at connector interface to clamp ±15 kV contact discharge before signal integrity is compromised. Use Value: Provides ESD immunity without degrading 1.5 Gbps video signal rise/fall times - validated per AEC-Q101 HBM ≥8 kV and CDM ≥1 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated by OEM or regional environmental regulations. | Choose SMAJ22AHM3_A/I when halogen-free bill-of-materials is required; otherwise SMAJ22AHE3_A/I is preferred for general automotive use. |
| SMCJ22AHE3_A/I | Same VWM/VBR/VC but in larger SMC (DO-214AB) package; 1500 W PPPM, higher IPPM (32.4 A), RθJA = 35 °C/W. | Used where higher surge energy absorption is needed (e.g., alternator output lines), but requires larger PCB footprint and different thermal layout. | Select SMAJ22AHE3_A/I for space-constrained 12 V rail protection; choose SMCJ22AHE3_A/I only if >400 W surge rating is explicitly required. |
Compared with SMAJ22AHM3_A/I, the SMAJ22AHE3_A/I offers identical protection performance with standard RoHS compliance; versus SMCJ22AHE3_A/I, it trades surge capacity for compact size and lower thermal resistance in ambient-limited layouts - making SMAJ22AHE3_A/I optimal for dense automotive PCBs where 400 W suffices.
Availability
SMAJ22AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and DC-DC converter input protection requiring stable component supply, AEC-Q101 qualification, and surface-mount manufacturability.
Supply support for SMAJ22AHE3_A/I 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 and automotive-grade validation.
The SMAJ series was developed specifically for high-speed transient suppression in automotive and industrial power systems, balancing compact size, AEC-Q101 compliance, and repeatable clamping performance under harsh thermal and electrical conditions.
FAQ
What is the clamping voltage of SMAJ22AHE3_A/I at its rated peak pulse current?
The SMAJ22AHE3_A/I has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and guarantees that downstream components will not experience voltages exceeding 35.5 V during surge events - a critical parameter for ensuring compatibility with 36 V-rated ICs and MOSFETs in automotive applications.
Is SMAJ22AHE3_A/I qualified for automotive use?
Yes, SMAJ22AHE3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, highly accelerated life testing (HALT), and ESD robustness validation per automotive standards. This qualification confirms its suitability for under-hood and cabin-mounted electronic control units, body electronics, and ADAS modules where reliability under thermal and electrical stress is mandatory.
What is the standoff voltage (VWM) and why does it matter for SMAJ22AHE3_A/I?
The standoff voltage (VWM) of SMAJ22AHE3_A/I is 22 V - the maximum continuous reverse voltage the device can block without entering avalanche conduction. This parameter ensures the TVS remains non-conductive during normal 12 V or 24 V system operation, minimizing leakage and avoiding false triggering. It directly determines compatibility with nominal supply rails and must be selected ≥10–15% below the protected circuit's absolute maximum voltage rating.
How does the thermal resistance of SMAJ22AHE3_A/I affect PCB layout?
SMAJ22AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, PCB layout must provide adequate copper area and minimize thermal isolation. Reducing pad size or removing thermal vias increases RθJA, risking thermal runaway during repetitive surges - so adherence to Vishay's recommended pad layout is essential for reliability.
Can SMAJ22AHE3_A/I be used in bidirectional configurations?
No, SMAJ22AHE3_A/I is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires a CA-suffixed part (e.g., SMAJ22CA). Using SMAJ22AHE3_A/I in reverse-biased AC or floating signal paths would result in forward conduction and potential failure. For bidirectional protection, select the correct CA variant or pair two unidirectional devices in series opposition - never substitute SMAJ22AHE3_A/I for a bidirectional function.
SMAJ22AHE3_A/I 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMAJ22AHE3_A/I FAQ
1.How can I place an order for SMAJ22AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHE3_A/I 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 SMAJ22AHE3_A/I reliable?
The price and inventory of SMAJ22AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ22AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHE3_A/I?
SMAJ22AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHE3_A/I 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 SMAJ22AHE3_A/I?
For technical support, including SMAJ22AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ22AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHE3_A/I 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 SMAJ22AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ22AHE3_A/I?
All SMAJ22AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHE3_A/I, 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 SMAJ22AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ22AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22AHE3_A/I Tags
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