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Vishay General Semiconductor - Diodes Division SMAJ26CAHM3_A/H
- Part No.:
- SMAJ26CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHM3_A/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ26CAHM3_A/H 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 standoff voltage (VWM), 28.9–31.9 V breakdown range (VBR at 1 mA), 42.1 V maximum clamping voltage (VC) at 9.5 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply interfaces.
For engineers reviewing the SMAJ26CAHM3_A/H datasheet, SMAJ26CAHM3_A/H pinout, SMAJ26CAHM3_A/H application, or SMAJ26CAHM3_A/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical bidirectional conduction-no polarity marking required. Its glass-passivated junction enables fast response (<1 ps) to transients induced by inductive load switching or ESD events, while maintaining low incremental surge resistance and stable clamping performance across -55 °C to +150 °C operating temperature range.
The SMAJ26CAHM3_A/H delivers 400 W peak pulse power up to 78 V, derating to 300 W above that threshold. It meets UL 497B recognition (QVGQ2) and JESD201 Class 2 whisker resistance, with matte tin-plated leads solderable per J-STD-002 and JESD22-B102 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown threshold ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 42.1 V at 9.5 A - Clamping voltage limits downstream component stress during 10/1000 μs surge; critical for protecting 3.3 V/5 V logic interfaces. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling capacity determines survivability against repetitive lightning or load-dump surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating supports unidirectional surge tolerance in hybrid protection schemes. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| RθJA | 120 °C/W - Thermal resistance dictates required copper pad area (0.2" × 0.2") for sustained 3.3 W power dissipation at 50 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band omitted for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | Accepts surge current from either direction; no polarity dependency due to symmetric bidirectional structure. |
| Cathode | Transient current exit (either polarity) | Completes clamping path to ground or rail; functions identically to anode under reverse bias-no marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per AEC specification. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-609A Class 1 definition; eliminates brominated flame retardants and antimony trioxide for safer end-of-life processing. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 9.5 A without degradation-sufficient for ISO 7637-2 Pulse 5a (load dump) simulation. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| MSL Level 1 rating | Enables standard SMT reflow without baking; compatible with high-throughput automated assembly lines using J-STD-020 profile. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 24 V supply rails in body control modules against load dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤42.1 V, preventing overvoltage shutdown or destruction of upstream regulator ICs rated for 45 V max input. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation equipment. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground to absorb ESD and switching noise. Use Value: Maintains signal integrity with <10 pF junction capacitance at VWM, avoiding bandwidth reduction or measurement drift in sub-100 kHz sensing applications. |
| Telecom Interface Protection | Consumer Device USB Port |
|
Use Scenario: Guarding RS-485 transceiver inputs on base station backhaul cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across A/B lines and common-mode to ground. Use Value: Provides 400 W surge immunity per line pair while preserving signal edge fidelity due to sub-nanosecond response time. |
Use Scenario: Safeguarding VBUS and D+/D− lines of USB-C ports in portable monitors against user-handling ESD (IEC 61000-4-2 ±15 kV contact). IC Role / Device Role / Timing Role: Discrete TVS array configured with one SMAJ26CAHM3_A/H per line for cost-effective multi-line protection. Use Value: Achieves system-level ESD pass without requiring integrated protection ICs-reducing BOM count and layout complexity. |
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/H | Same electrical specs and package, but RoHS-compliant without halogen-free certification; uses standard SnPb-free matte tin plating. | Approved for commercial/industrial use; not certified for halogen-free requirements in automotive OEM specifications. | Select when halogen-free compliance is not mandated and cost optimization is prioritized. |
| SMAJ26AHE3_A/H | Unidirectional variant with cathode band marking; identical VWM, VBR, and VC, but only conducts in reverse direction. | Requires correct polarity placement; unsuitable for AC-coupled or floating signal lines where bidirectional clamping is essential. | Choose only for DC-biased rails where polarity is fixed and lower leakage at VWM is beneficial. |
Compared with SMAJ26CAHE3_A/H, the SMAJ26CAHM3_A/H adds halogen-free assurance for stricter environmental compliance; versus SMAJ26AHE3_A/H, it provides polarity-agnostic protection essential for differential or AC signal paths-making it the preferred choice for automotive sensor interfaces and telecom data lines.
Availability
SMAJ26CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor signal conditioning, telecom interface protection, and consumer USB port hardening requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ26CAHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are mandatory.
FAQ
What is the clamping voltage of SMAJ26CAHM3_A/H at its rated peak pulse current?
The SMAJ26CAHM3_A/H has a maximum clamping voltage (VC) of 42.1 V at 9.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable voltage limiting during surge events. The clamping performance remains stable across its full operating temperature range (-55 °C to +150 °C), making SMAJ26CAHM3_A/H suitable for under-hood automotive deployments where thermal margin is critical.
Is SMAJ26CAHM3_A/H qualified for automotive applications?
Yes, SMAJ26CAHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock-ensuring reliability in automotive powertrain, chassis, and body electronics. The SMAJ26CAHM3_A/H also carries UL 497B recognition (QVGQ2), further validating its suitability for automotive transient protection circuits.
How does the bidirectional design of SMAJ26CAHM3_A/H affect PCB layout?
The bidirectional design of SMAJ26CAHM3_A/H eliminates polarity marking-no cathode band is present-so orientation on the PCB is irrelevant. This simplifies automated placement and reduces assembly errors in differential or AC-coupled signal paths. Unlike unidirectional variants, SMAJ26CAHM3_A/H can be placed across any two nodes without regard to voltage polarity, enabling flexible integration in RS-485, CAN FD, or sensor bridge configurations where voltage reversal may occur.
What is the thermal resistance and recommended pad layout for SMAJ26CAHM3_A/H?
SMAJ26CAHM3_A/H 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, as specified in Vishay's datasheet. To maintain safe junction temperatures under continuous 3.3 W power dissipation, designers must adhere to this minimum pad area and ensure adequate copper pour connectivity. Deviation increases thermal impedance and risks exceeding the +150 °C TJ limit during repeated surge events.
Does SMAJ26CAHM3_A/H meet halogen-free and RoHS requirements?
Yes, SMAJ26CAHM3_A/H is both halogen-free and RoHS-compliant, meeting JEDEC J-STD-609A Class 1 definitions and EU Directive 2011/65/EU. The "HM3" suffix explicitly denotes halogen-free construction-free of brominated flame retardants, antimony trioxide, and other restricted substances. This makes SMAJ26CAHM3_A/H acceptable for automotive OEMs and industrial customers enforcing strict material declarations and end-of-life processing standards.
SMAJ26CAHM3_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):
- 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/H FAQ
1.How can I place an order for SMAJ26CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHM3_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 SMAJ26CAHM3_A/H reliable?
The price and inventory of SMAJ26CAHM3_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 SMAJ26CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHM3_A/H?
SMAJ26CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHM3_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 SMAJ26CAHM3_A/H?
For technical support, including SMAJ26CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ26CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHM3_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 SMAJ26CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHM3_A/H?
All SMAJ26CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHM3_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 SMAJ26CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ26CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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