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Vishay General Semiconductor - Diodes Division SMAJ26CAHM3/H
- Part No.:
- SMAJ26CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHM3/H.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,621
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Product details
Overview
SMAJ26CAHM3/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 with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ26CAHM3/H datasheet, SMAJ26CAHM3/H pinout, SMAJ26CAHM3/H application, or SMAJ26CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), MSL Level 1 moisture sensitivity, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding VWM, it avalanches symmetrically in both directions to clamp voltage at ≤42.1 V while diverting up to 9.5 A surge current. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at 26 V), and its unmarked SMA package confirms bidirectional polarity.
Thermally, it sustains 150 °C max junction temperature with 3.3 W steady-state power dissipation on infinite heatsink; derating begins above 25 °C ambient per Fig. 2. The device meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements for surface-mount reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed bidirectional avalanche threshold range for design margining |
| VC @ IPPM | 42.1 V at 9.5 A - Clamped voltage during 10/1000 μs surge, defining protected circuit's worst-case overvoltage |
| PPPM | 400 W - Peak pulse power handling capability, sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients |
| TJ max | +150 °C - Enables operation in under-hood automotive environments without thermal shutdown |
| RθJA | 120 °C/W - Requires ≥0.2" × 0.2" copper pads per terminal for rated power derating per datasheet Fig. 2 |
| MSL Level | Level 1 - No floor life limitation; supports standard SMT reflow without baking |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical cathode/anode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during negative transients and positive surges relative to cathode |
| Cathode | Transient return path (bidirectional) | Connects to protected line; conducts during positive transients and negative surges relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and enables compliance with EU ELV Directive and OEM material declarations |
| 400 W peak pulse power (10/1000 μs) | Withstands repetitive load-dump and inductive-switching transients common in 12 V/24 V vehicle systems |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers and microcontrollers |
| Fast response time (<1 ps) | Clamps before transient energy couples into protected circuitry, preserving signal integrity on high-speed lines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed control modules from load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between power rail and ground, clamping transients before they reach MCU power pins. Use Value: Limits rail voltage to ≤42.1 V during 100 V/100 ms load dump events, preventing brownout or latch-up in 3.3 V/5 V logic. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in factory-floor pressure sensors exposed to ESD and motor switching noise. IC Role / Device Role / Timing Role: Bidirectional clamping element across signal and return, suppressing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal fidelity by clamping transients within 1 ns, avoiding offset drift or ADC saturation in precision measurement circuits. |
| Telecom Interface Protection | Consumer USB Port ESD Suppression |
Use Scenario: Shielding RS-485 transceiver I/O pins in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF at 0 V) bidirectional TVS placed differential across A/B lines. Use Value: Provides 400 W surge immunity without distorting 10 Mbps differential signaling due to symmetric clamping and minimal parasitic capacitance. | Use Scenario: Adding secondary-level ESD protection to USB 2.0 D+/D− lines in smart home hubs after primary TVS array. IC Role / Device Role / Timing Role: Standby-mode shunt protector with <1.0 μA leakage at 26 V, minimizing standby current drain. Use Value: Survives repeated ±15 kV air discharge events while adding <0.5 pF per line to maintain USB eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CAHE3/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification required by Tier 1 automotive OEMs | Select when halogen-free content is not mandated and cost optimization is prioritized |
| SMBJ26CAHM3 | Higher 600 W PPPM; SMB package (DO-214AA), larger footprint and 10% higher RθJA | Better surge margin but requires PCB redesign; unsuitable for space-constrained layouts | Select when system-level surge testing exceeds 400 W and board area permits larger package |
Compared with SMAJ26CAHE3/H, the SMAJ26CAHM3/H adds halogen-free compliance for strict automotive material declarations; compared with SMBJ26CAHM3, it trades 200 W pulse power for 25% smaller footprint and lower thermal resistance - making it optimal for compact, AEC-Q101–required designs where 400 W suffices.
Availability
SMAJ26CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom data links, and consumer USB port protection requiring stable component supply and full traceability.
Supply support for SMAJ26CAHM3/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 automotive qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 validation, precise clamping, and long-term stability are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMAJ26CAHM3/H?
The 'HM3' suffix in SMAJ26CAHM3/H denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards. It also signals AEC-Q101 qualification - critical for automotive use. This distinguishes SMAJ26CAHM3/H from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants. All versions share identical electrical specs, but HM3 satisfies stricter OEM material content requirements.
Is SMAJ26CAHM3/H suitable for protecting CAN bus lines?
Yes, SMAJ26CAHM3/H is suitable for CAN bus protection when placed across CAN_H/CAN_L differential pair or from each line to ground. Its 42.1 V clamping voltage safely limits transients without disrupting the ±1 V common-mode range of ISO 11898-2 physical layer. With <1.0 μA leakage at 26 V and bidirectional symmetry, SMAJ26CAHM3/H preserves bus biasing and avoids false dominant states during normal operation.
How does the clamping voltage of SMAJ26CAHM3/H compare to its breakdown voltage?
SMAJ26CAHM3/H has a minimum breakdown voltage (VBR) of 28.9 V and a maximum clamping voltage (VC) of 42.1 V at 9.5 A. The clamping ratio (VC/VBR) is approximately 1.38 - indicating tight voltage control during surge events. This low ratio ensures protected ICs experience minimal overvoltage stress, especially important for 3.3 V or 5 V logic powered from 24 V systems where headroom is limited.
Does SMAJ26CAHM3/H require a heatsink for 400 W pulse handling?
No, SMAJ26CAHM3/H does not require an external heatsink for 400 W pulse handling because the 10/1000 μs surge is non-repetitive and thermally short. The device relies on PCB copper pads (0.2" × 0.2" per terminal) for transient heat dissipation. However, for continuous power dissipation, its 3.3 W rating at 50 °C ambient assumes infinite heatsink conditions - practical designs must derate per Fig. 2 and limit DC power to <0.5 W without additional thermal management.
Can SMAJ26CAHM3/H replace SMAJ26A in a bidirectional circuit?
No - SMAJ26A is unidirectional (cathode-banded), while SMAJ26CAHM3/H is bidirectional (no band). Substituting SMAJ26CAHM3/H for SMAJ26A in a unidirectional configuration risks forward conduction during normal operation if polarity is misaligned. Conversely, SMAJ26A cannot protect against negative transients. Always match device directionality to circuit topology: use SMAJ26CAHM3/H only where symmetrical clamping is required, such as AC lines or differential buses.
SMAJ26CAHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMAJ26CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHM3/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/H reliable?
The price and inventory of SMAJ26CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHM3/H?
SMAJ26CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHM3/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/H?
For technical support, including SMAJ26CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHM3/H requirements.
6.How does Aetrix verify that SMAJ26CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHM3/H?
All SMAJ26CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ26CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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