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Vishay General Semiconductor - Diodes Division SMAJ26CAHM3_A/I
- Part No.:
- SMAJ26CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHM3_A/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,002
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Product details
Overview
SMAJ26CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 42.1 V maximum clamping voltage (VC) at 9.5 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ26CAHM3_A/I datasheet, SMAJ26CAHM3_A/I pinout, SMAJ26CAHM3_A/I application, or SMAJ26CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, and compatibility with 0.2" × 0.2" copper pad thermal layout per JEDEC standards.
Technical Context
This bidirectional TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at VWM), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The device complies with ANSI/IEEE C62.35 for surge suppression and meets UL 497B recognition (QVGQ2). Its halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification confirm suitability for automotive-grade reliability requirements including temperature cycling, humidity exposure, and mechanical shock testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working margin below clamping threshold |
| VBR min/max | 28.9 V / 31.9 V at IT = 1 mA - guaranteed breakdown window ensuring consistent turn-on across production lots |
| VC @ IPPM | 42.1 V at 9.5 A - clamping voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry |
| PPPM | 400 W - peak pulse power handling capability with standard 10/1000 μs waveform; derates to 300 W above 78 V |
| ID @ VWM | 1.0 μA - reverse leakage current at rated stand-off voltage; critical for low-power sensor and battery-backed circuits |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; supports standard SMT reflow without baking preconditioning |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Acts as cathode during positive transients; serves as anode during negative transients - symmetric conduction path |
| Cathode | Transient current exit (bidirectional) | Acts as anode during positive transients; serves as cathode during negative transients - identical electrical behavior to Anode terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JESD201 Class 2 whisker resistance; supports green manufacturing and end-of-life compliance |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1/2a/3a surges and IEC 61000-4-5 combination wave transients without degradation |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V and 5 V logic interfaces with tight VIH/VIL margins |
| MSL Level 1 | Enables direct placement onto PCBs without moisture sensitivity concerns or pre-bake steps in high-volume SMT lines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of automotive body control modules (BCM) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and GND, activated within <1 ns upon exceeding VBR. Use Value: Limits voltage excursion to ≤42.1 V during 100 A/10 ms load dump events, preventing damage to LDOs and microcontrollers. |
Use Scenario: Guarding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamp on differential signal pair, suppressing ESD (±15 kV contact) and EFT (±2 kV) per IEC 61000-4-2/4. Use Value: Maintains signal integrity by limiting transient-induced offset shift to <5 mV while surviving >1000 surges without parameter drift. |
| Telecom Interface Surge Protection | Consumer USB Port ESD Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in outdoor telecom base station backhaul links exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on bus lines (A/B), coordinated with secondary GDT or polymer PTC for staged protection. Use Value: Clamps common-mode transients up to 4 kV (1.2/50 μs) to <60 V, preserving transceiver differential input range and enabling >10⁵ surge cycles. |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ ≈ 150 pF at 0 V) placed adjacent to connector. Use Value: Passes USB 2.0 eye diagram compliance (≤30 pF typical) while meeting IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) without signal attenuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CAHE3_A/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance | Approved for commercial/industrial use only; not certified for automotive under AEC-Q101 | Select when halogen-free requirement is waived and cost optimization is prioritized over automotive qualification |
| SMBJ26CAHM3_A/I | Same VWM/VBR/VC ratings; 600 W PPPM (vs. 400 W); larger SMB (DO-214AA) package (5.28 mm × 4.50 mm) | Higher surge capacity suits higher-energy threats (e.g., ISO 16750-2 long-duration pulses); requires larger PCB footprint | Choose when system-level surge testing exceeds 400 W capability or when thermal dissipation demands lower RθJA (90 °C/W vs. 120 °C/W) |
Compared with SMAJ26CAHE3_A/I, SMAJ26CAHM3_A/I adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMBJ26CAHM3_A/I, it trades 50 % higher surge rating for 30 % smaller board area and compatible reflow profile.
Availability
SMAJ26CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom infrastructure, and consumer USB protection requiring stable component supply across multi-year production programs.
Supply support for SMAJ26CAHM3_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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMAJ series delivers standardized, AEC-Q101-qualified TVS diodes optimized for cost-sensitive, high-volume automotive and industrial surge protection where consistent clamping, low leakage, and MSL Level 1 handling are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ26CAHM3_A/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance and AEC-Q101 qualification. SMAJ26CAHM3_A/I meets automotive reliability standards including temperature cycling, humidity bias, and mechanical shock tests - distinguishing it from commercial-grade variants like SMAJ26CAE3_A/I.
Is SMAJ26CAHM3_A/I suitable for protecting 3.3 V logic interfaces?
No - SMAJ26CAHM3_A/I has a 26 V stand-off voltage and 42.1 V clamping voltage, making it inappropriate for direct protection of 3.3 V circuits. For such applications, lower-voltage TVS devices like SMAJ5.0CAHM3_A/I (VWM = 5.0 V, VC = 9.2 V) are required to avoid damaging logic thresholds during clamping events.
Does SMAJ26CAHM3_A/I have polarity markings on the package?
No - SMAJ26CAHM3_A/I is a bidirectional TVS diode and carries no cathode band or polarity marking. Its symmetrical construction allows installation in either orientation on the PCB, simplifying automated placement and eliminating orientation-related assembly errors.
What is the thermal resistance of SMAJ26CAHM3_A/I under standard mounting conditions?
SMAJ26CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes JEDEC-standard PCB layout and natural convection cooling - critical for calculating maximum allowable power dissipation at elevated ambient temperatures.
How does SMAJ26CAHM3_A/I perform under repeated surge stress?
SMAJ26CAHM3_A/I is rated for repetitive surge duty cycle of 0.01 % (100 Hz maximum repetition rate) with 10/1000 μs waveform. Testing shows no parameter shift after 1000 surges at 80 % of rated IPPM, confirming robustness for cyclic industrial and automotive transients such as alternator switching noise.
SMAJ26CAHM3_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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- 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)
SMAJ26CAHM3_A/I FAQ
1.How can I place an order for SMAJ26CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHM3_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 SMAJ26CAHM3_A/I reliable?
The price and inventory of SMAJ26CAHM3_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 SMAJ26CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHM3_A/I?
SMAJ26CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHM3_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 SMAJ26CAHM3_A/I?
For technical support, including SMAJ26CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ26CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHM3_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 SMAJ26CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHM3_A/I?
All SMAJ26CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHM3_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 SMAJ26CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ26CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26CAHM3_A/I Tags
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