My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ22AHM3_A/H
- Part No.:
- SMAJ22AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHM3_A/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,155
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ22AHM3_A/H 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 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), suitable for protecting MOSFETs and ICs in automotive and industrial power rails.
For engineers reviewing the SMAJ22AHM3_A/H datasheet, SMAJ22AHM3_A/H pinout, SMAJ22AHM3_A/H application, or SMAJ22AHM3_A/H equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per ordering suffix HM3.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling suppression of ESD and inductive switching spikes before downstream components are damaged.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), junction temperature range of –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its SMA package supports automated placement and provides 30 °C/W junction-to-lead thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working limit for protected line. |
| VBR min/max | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown window ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamping voltage under 10/1000 μs surge; must remain below protected IC's absolute max rating (e.g., <40 V for 3.3 V logic I/O). |
| PPPM | 400 W - Peak pulse power handling capability; determines survivability against standardized lightning/inductive transients per IEC 61000-4-5. |
| ID @ VWM | ≤1.0 μA - Low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures without derating. |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal footprint per terminal. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band on one end; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental regulations and enables use in green manufacturing programs. |
| 400 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V supply lines. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during clamping-critical for safeguarding 3.3 V or 5 V logic interfaces tied to same rail. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT assembly planning. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 24 V vehicle battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V rail and chassis ground to clamp positive-going surges. Use Value: Prevents latch-up or gate oxide damage in MCU power management ICs by limiting rail voltage to ≤35.5 V during 11.3 A surge events. |
Use Scenario: Protecting analog output pins of pressure sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected between sensor output and ground to shunt fast transients before reaching ADC input stage. Use Value: Maintains signal fidelity with <1.0 μA leakage at 22 V, while clamping 8 kV HBM ESD pulses within 1 ns to prevent ADC saturation or reset. |
| Telecom DC Power Input Stage | Consumer Appliance Motor Drive Feedback |
Use Scenario: Safeguarding PoE-powered switch ports against induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: TVS installed across secondary-side 48 V DC input to isolate Ethernet PHY from field-induced transients. Use Value: Withstands repetitive 400 W surges without degradation, ensuring long-term reliability in outdoor telecom cabinets. |
Use Scenario: Clamping back-EMF spikes generated by brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Mounted across motor terminals to divert inductive kickback away from microcontroller GPIO and driver FETs. Use Value: 40 A IFSM rating handles worst-case motor stall currents; 150 °C TJ max supports sealed enclosure thermal profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3_A/H | Same electrical specs but RoHS-compliant (non-halogen-free) commercial-grade variant; no AEC-Q101 qualification. | Limited to non-automotive industrial or consumer designs where halogen content is unrestricted. | Select when cost sensitivity outweighs automotive qualification or halogen-free requirements. |
| SMBJ22A-H | Higher 600 W PPPM rating in larger SMB (DO-214AA) package; VWM = 22 V, VC = 35.5 V, RθJA = 90 °C/W. | Better thermal performance and surge margin, but requires PCB layout change due to larger footprint. | Choose for higher-reliability industrial power supplies where board space permits larger package and enhanced surge headroom. |
Compared with SMAJ22AHM3_A/H, the HE3 variant lacks AEC-Q101 and halogen-free certification but offers identical clamping behavior at lower cost, while SMBJ22A-H delivers superior thermal dissipation and surge capacity in a physically incompatible package.
Availability
SMAJ22AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, telecom power inputs, and appliance motor controls requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ22AHM3_A/H 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, MOSFETs, and protection devices with emphasis on reliability and automotive-grade validation.
The SMAJ series targets high-volume transient suppression in harsh environments, with design focus on fast clamping, low leakage, and AEC-Q101 compliance for power and signal line protection.
FAQ
What is the clamping voltage of SMAJ22AHM3_A/H at its rated peak pulse current?
The SMAJ22AHM3_A/H has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value is critical for verifying that the protected circuit's voltage tolerance-such as an MCU's absolute maximum rating-is not exceeded during transient events. The SMAJ22AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ22AHM3_A/H qualified for automotive applications?
Yes, SMAJ22AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock, making SMAJ22AHM3_A/H suitable for under-hood and body-control module applications where reliability under thermal and vibration stress is mandatory.
What does the "HM3" suffix indicate in SMAJ22AHM3_A/H?
The "HM3" suffix in SMAJ22AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "HE3" (RoHS-compliant but not halogen-free) and standard "E3" (commercial grade). The "_A/H" further specifies packaging: 7-inch tape-and-reel, 1800-unit quantity, with H as the preferred package code per Vishay's ordering guide.
How does SMAJ22AHM3_A/H compare to SMAJ22A in terms of thermal performance?
SMAJ22AHM3_A/H shares identical thermal characteristics with other SMAJ22A variants: typical junction-to-ambient thermal resistance (RθJA) is 120 °C/W on standard 0.2" × 0.2" copper pads, and junction-to-lead resistance (RθJL) is 30 °C/W. These values are defined by the SMA (DO-214AC) package geometry and are unaffected by the HM3 suffix, which governs material composition-not thermal design.
Can SMAJ22AHM3_A/H be used in bidirectional configurations?
No, SMAJ22AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and presence of cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ22CA), which has symmetric breakdown in both polarities. Using SMAJ22AHM3_A/H in reverse-biased signal paths without proper polarity alignment will result in unintended conduction or failure to clamp negative transients.
SMAJ22AHM3_A/H 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:
- 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_A/H FAQ
1.How can I place an order for SMAJ22AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHM3_A/H 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_A/H reliable?
The price and inventory of SMAJ22AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ22AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHM3_A/H?
SMAJ22AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHM3_A/H 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_A/H?
For technical support, including SMAJ22AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ22AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ22AHM3_A/H?
All SMAJ22AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMAJ22AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22AHM3_A/H 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 …
