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Vishay General Semiconductor - Diodes Division SMAJ22CAHM3_A/H
- Part No.:
- SMAJ22CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHM3_A/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ22CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power 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 (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ22CAHM3_A/H datasheet, SMAJ22CAHM3_A/H pinout, SMAJ22CAHM3_A/H application, or SMAJ22CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), low clamping ratio (VC/VWM ≈ 1.61), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding VWM (22 V), it avalanches symmetrically in both directions to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the low incremental surge resistance minimizes voltage overshoot under high di/dt conditions.
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance RθJA = 120 °C/W enabling operation up to +150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
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 avalanche onset range; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream 3.3 V/5 V logic or 24 V interface ICs. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | 1.0 μA - Reverse leakage at 22 V; negligible loading on high-impedance sensor or communication lines. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| MSL Level | Level 1 (per J-STD-020) - No floor life limitation; compatible with standard reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band absent - terminals are symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient shunt path | Either terminal serves as input/output; clamps positive or negative transients equally - no orientation required during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements - supports deployment in ADAS sensors, body control modules, and infotainment power rails. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 400 W peak pulse power (10/1000 μs) | Withstands repeated lightning-induced surges per IEC 61000-4-5; requires only 0.2" × 0.2" copper pads per terminal for full rating. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 24 V CAN transceivers and RS-485 drivers. |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime; reduces parameter drift in harsh thermal cycling environments (−55 °C to +150 °C). |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control units (ECUs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional shunt clamp that diverts surge energy away from DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤35.5 V during 100 A/10 ms load dump events - preventing latch-up or permanent damage to 36 V-rated regulators. |
Use Scenario: Safeguarding analog outputs and digital I/O of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response voltage limiter on 4–20 mA current loop and RS-485 bus lines exposed to ESD and EFT. Use Value: Sub-1 ns response and <1.0 μA leakage preserve signal integrity while meeting IEC 61000-4-2 Level 4 (±15 kV air) and IEC 61000-4-4 Level 3 (±2 kV) immunity. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Protection |
Use Scenario: Shielding USB VBUS and D+/D− lines in smart home hubs from ESD and hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed upstream of USB transceivers and ESD diodes. Use Value: 35.5 V clamping prevents overvoltage on 5 V tolerant PHYs; MSL Level 1 enables single-pass reflow without baking. |
Use Scenario: Guarding −48 V DC telecom power inputs against lightning-induced surges in base station remote radio units (RRUs). IC Role / Device Role / Timing Role: Primary shunt suppressor on input filter stage, coordinated with MOVs and gas discharge tubes. Use Value: 400 W rating handles partial energy from Class III surge events; halogen-free construction meets Telcordia GR-1089-CORE requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CAHE3_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial use where automotive qualification is not mandated. | Select when cost sensitivity outweighs halogen-free or automotive compliance requirements. |
| SMBJ22CAHM3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W). | Better thermal dissipation and higher surge margin; requires larger PCB footprint. | Choose for higher-reliability 24 V systems needing >400 W surge headroom or extended thermal lifetime. |
Compared with SMAJ22CAHM3_A/H, SMAJ22CAHE3_A/H offers identical protection performance without halogen-free or AEC-Q101 assurance, while SMBJ22CAHM3_A/H delivers greater surge robustness in a physically larger package - enabling trade-offs between board space, automotive compliance, and surge margin.
Availability
SMAJ22CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB hubs, and telecom DC power inputs requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ22CAHM3_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, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in space-constrained, high-reliability applications - particularly targeting automotive, industrial, and telecom systems where consistent clamping, AEC-Q101 validation, and SMT manufacturability are essential.
FAQ
What does the "HM3" suffix indicate in SMAJ22CAHM3_A/H?
The HM3 suffix in SMAJ22CAHM3_A/H denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. This means the device meets automotive reliability standards including temperature cycling, humidity testing, and mechanical shock - verified per JESD22-A108 and AEC-Q101 Rev H. SMAJ22CAHM3_A/H is certified for under-hood and chassis-mounted applications where long-term stability under thermal stress is critical.
Is SMAJ22CAHM3_A/H unidirectional or bidirectional?
SMAJ22CAHM3_A/H is a bidirectional TVS diode, indicated by the "CA" in its part number. It provides symmetrical clamping for both positive and negative transients without polarity sensitivity - no cathode band marking is present. This makes SMAJ22CAHM3_A/H ideal for AC-coupled lines, differential buses like RS-485, and any application where voltage polarity reversal must be protected without layout constraints.
What is the maximum clamping voltage of SMAJ22CAHM3_A/H and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ22CAHM3_A/H is 35.5 V, measured at a peak pulse current (IPPM) of 11.3 A using the standardized 10/1000 μs double-exponential waveform. This VC value is guaranteed across temperature and lifetime per Vishay's characterization - ensuring that protected circuits see no more than 35.5 V during surge events, which is vital for safeguarding 24 V-rated components such as CAN transceivers and power management ICs.
Can SMAJ22CAHM3_A/H replace SMAJ22A in a design?
No - SMAJ22CAHM3_A/H is bidirectional, whereas SMAJ22A is unidirectional and features a cathode band for polarity-sensitive placement. Replacing SMAJ22A with SMAJ22CAHM3_A/H may cause unintended conduction in DC-biased circuits due to symmetrical breakdown. SMAJ22CAHM3_A/H is only a functional replacement where bidirectional protection is explicitly required and system topology supports non-polarized clamping.
What PCB pad layout is required to achieve the full 400 W rating for SMAJ22CAHM3_A/H?
To achieve the full 400 W peak pulse power rating, SMAJ22CAHM3_A/H must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, as defined in Vishay's datasheet Figure 1. Smaller pads reduce thermal dissipation and derate PPPM - e.g., inadequate copper may limit sustained surge capability to ~250 W. The SMAJ22CAHM3_A/H datasheet specifies this layout for compliance with IEC 61000-4-5 testing conditions.
SMAJ22CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ22CAHM3_A/H FAQ
1.How can I place an order for SMAJ22CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHM3_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 SMAJ22CAHM3_A/H reliable?
The price and inventory of SMAJ22CAHM3_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 SMAJ22CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHM3_A/H?
SMAJ22CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHM3_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 SMAJ22CAHM3_A/H?
For technical support, including SMAJ22CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ22CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHM3_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 SMAJ22CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHM3_A/H?
All SMAJ22CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHM3_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 SMAJ22CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ22CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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