My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ22AHM3/I
- Part No.:
- SMAJ22AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHM3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,744
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ22AHM3/I 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 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 SMAJ22AHM3/I datasheet, SMAJ22AHM3/I pinout, SMAJ22AHM3/I application, or SMAJ22AHM3/I equivalent, this device is selected for robust overvoltage protection where low-profile mounting, AEC-Q101 qualification, and stable clamping under repetitive surge conditions are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), enabling suppression of ESD and inductive switching spikes before sensitive downstream circuitry is damaged.
The SMAJ22AHM3/I is rated for 40 A non-repetitive forward surge current (IFSM) and operates across –55 °C to +150 °C junction temperature range. Its thermal resistance (RθJA = 120 °C/W) and halogen-free, RoHS-compliant HM3 suffix indicate suitability for high-reliability commercial and automotive applications requiring LF peak soldering at 260 °C per J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamping voltage limits transient energy delivered to protected ICs during 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power handling capacity with 10/1000 μs waveform supports IEC 61000-4-5 Level 3/4 surge immunity. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms) enables resilience against motor-switching or relay-coil turn-off transients. |
| TJ max. | +150 °C - High junction temperature rating allows operation in under-hood automotive environments and enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design support per datasheet fig. 2. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side (e.g., ground or return path); defines directionality of clamping action. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 24 V rail); conducts surge current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for modern automotive and industrial OEM BOMs without compromising thermal performance. |
| 400 W peak pulse power (10/1000 μs) | Supports sustained transient suppression in 24 V power rails subject to ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| Low incremental surge resistance | Enables tighter VC–VBR differential (11.1 V headroom), reducing stress on downstream MOSFET gate oxides and logic inputs. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning, simplifying SMT assembly in high-volume production. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 24 V supply inputs to body control modules (BCM) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and input filter capacitor. Use Value: Limits transients to ≤35.5 V during 100 V/400 ms load dump events, preventing damage to LDO regulators and CAN transceivers. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loop) from ESD and field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor transmitter PCB, mounted adjacent to connector. Use Value: Sub-1 ns response clamps 8 kV contact ESD per IEC 61000-4-2 without affecting 12-bit DAC linearity or loop accuracy. |
| DC-DC Converter Input Stage | Motor Drive Gate Driver Supply |
|
Use Scenario: Input protection for buck converters powering infotainment systems from vehicle battery. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input EMI filter and bulk capacitor. Use Value: Absorbs 400 W surge energy while maintaining VC below 36 V, ensuring converter ICs remain within absolute maximum ratings. |
Use Scenario: Guarding isolated 15 V gate drive supply rails in 3-phase inverter modules against Miller-induced spikes. IC Role / Device Role / Timing Role: Local TVS on gate driver IC's VDD pin, placed within 5 mm of IC power pin. Use Value: Prevents latch-up in high-side drivers during shoot-through events by clamping transients before they exceed 35.5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free requirement is not enforced (e.g., non-automotive industrial). | Select SMAJ22AHE3/I if halogen content is unrestricted and cost optimization is prioritized. |
| SMAJ22A-M3/5A | Same halogen-free HM3 material, but supplied in 13" tape-and-reel (7500 pcs); identical VWM, VBR, VC, and PPPM. | Preferred for high-volume SMT lines using large reels to minimize changeover frequency. | Choose SMAJ22A-M3/5A when procurement volume exceeds 50k units/year and reel logistics favor 13" format. |
Compared with SMAJ22AHM3/I, SMAJ22AHE3/I offers identical surge performance without halogen-free certification, while SMAJ22A-M3/5A delivers identical specifications in higher-reel packaging - both serve as functionally aligned alternatives without layout or schematic changes.
Availability
SMAJ22AHM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, DC-DC converter input stages, and motor drive gate driver supply circuits requiring stable component supply and full traceability.
Supply support for SMAJ22AHM3/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, efficiency, and application-specific validation.
The SMAJ series was developed to deliver standardized, high-power TVS protection in compact surface-mount packages for automotive, industrial, and telecom infrastructure - balancing clamping precision, surge robustness, and manufacturability.
FAQ
What is the clamping voltage of the SMAJ22AHM3/I under a 10/1000 μs surge?
The SMAJ22AHM3/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 per JEDEC standards and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping performance ensures protected circuits remain within safe voltage margins during standardized surge events. SMAJ22AHM3/I maintains this specification across its full operating temperature range.
Is the SMAJ22AHM3/I qualified for automotive applications?
Yes, the SMAJ22AHM3/I carries AEC-Q101 qualification, verified through temperature cycling, high-temperature reverse bias (HTRB), and surge endurance testing. Its HM3 suffix denotes halogen-free, RoHS-compliant construction meeting automotive environmental requirements. SMAJ22AHM3/I is explicitly designated for use in automotive power and signal protection - including BCM, ADAS sensors, and infotainment power supplies.
What does the "HM3" suffix mean in SMAJ22AHM3/I?
The "HM3" suffix in SMAJ22AHM3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads, qualified to JESD 201 Class 2 whisker resistance and MSL Level 1 (260 °C peak). It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) versions. SMAJ22AHM3/I meets strict automotive and industrial environmental mandates without sacrificing electrical or thermal performance.
Can SMAJ22AHM3/I replace SMAJ22A-E3/61 in an existing design?
SMAJ22AHM3/I is electrically and mechanically identical to SMAJ22A-E3/61 in VWM, VBR, VC, PPPM, and SMA package dimensions, but adds halogen-free compliance and AEC-Q101 qualification. No PCB layout or schematic changes are needed. SMAJ22AHM3/I supports the same thermal pad layout and reflow profile, making it a drop-in upgrade for enhanced reliability and regulatory alignment.
What is the maximum junction temperature rating for SMAJ22AHM3/I?
The SMAJ22AHM3/I has a maximum junction temperature (TJ) rating of +150 °C, validated per Vishay's thermal characterization. This enables reliable operation in under-hood automotive environments and sealed industrial enclosures. Derating curves in the datasheet confirm usable power dissipation down to ambient temperatures of +125 °C when mounted on recommended 5.0 mm × 5.0 mm copper pads. SMAJ22AHM3/I sustains full surge capability up to this limit.
SMAJ22AHM3/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:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22AHM3/I FAQ
1.How can I place an order for SMAJ22AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHM3/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 SMAJ22AHM3/I reliable?
The price and inventory of SMAJ22AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ22AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHM3/I?
SMAJ22AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHM3/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 SMAJ22AHM3/I?
For technical support, including SMAJ22AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHM3/I requirements.
6.How does Aetrix verify that SMAJ22AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHM3/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 SMAJ22AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ22AHM3/I?
All SMAJ22AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHM3/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 SMAJ22AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ22AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22AHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
