My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ26CAHM3/I
- Part No.:
- SMAJ26CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CAHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,509
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ26CAHM3/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 standoff voltage (VWM), 28.9–31.9 V breakdown range (VBR at 1 mA), and clamps transients to ≤42.1 V at 9.5 A peak pulse current (IPPM) under 10/1000 μs waveform. It delivers 400 W peak pulse power and is AEC-Q101 qualified for automotive applications including power line and signal line protection.
For engineers reviewing the SMAJ26CAHM3/I datasheet, SMAJ26CAHM3/I pinout, SMAJ26CAHM3/I application, or SMAJ26CAHM3/I equivalent, this device serves as a halogen-free, RoHS-compliant, bidirectional TVS with MSL Level 1 rating, optimized for ESD and lightning surge suppression in automotive ECUs, sensor interfaces, and industrial I/O circuits where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection without polarity sensitivity on AC lines or differential signal paths. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 26 V), while the low incremental surge resistance supports consistent clamping performance under repetitive transients.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 10/1000 μs waveform rating applies up to 400 W below 78 V - confirmed at 9.5 A IPPM and 42.1 V VC - with derating above 25 °C per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - Maximum continuous reverse voltage before conduction begins; defines operating margin for protected circuit. |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1 mA - Confirmed bidirectional breakdown range; ensures reliable triggering during overvoltage events. |
| VC (Clamping Voltage) | ≤42.1 V at 9.5 A IPPM - Peak voltage seen by downstream circuit during 10/1000 μs surge; limits stress on ICs/MOSFETs. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standardized surge waveform; validated at TA = 25 °C. |
| IPPM (Peak Pulse Current) | 9.5 A - Maximum non-repetitive surge current supported; derived directly from VC and PPPM (P = V × I). |
| TJmax | 150 °C - Maximum allowable junction temperature; enables operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package with matte tin-plated leads; compatible with automated placement and J-STD-002 soldering. |
Pinout & Package
Package: SMA (DO-214AC), 2-terminal surface-mount case with no polarity marking for bidirectional operation. Terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction; either terminal accepts positive or negative transients - enables AC-line and differential-signal protection without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance mandates without compromising surge robustness or thermal performance. |
| 400 W peak pulse power (10/1000 μs) | Provides high-energy transient suppression for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3/4 surges. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V/5 V logic and automotive CAN/LIN transceivers. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-related delamination or popcorn failure. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between VCC and GND to shunt transients exceeding 26 V. Use Value: Limits rail voltage to ≤42.1 V during 9.5 A surges, preventing latch-up or permanent damage to 3.3 V/5 V MCUs and PMICs. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: TVS placed across sensor output and ground to absorb ESD (IEC 61000-4-2 ±8 kV contact) and inductive kickback. Use Value: Clamps transients within <1 ns, preserving signal integrity and preventing ADC saturation or op-amp input stage damage. |
| Telecom Data Line Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: Protecting RS-485 transceiver I/O pins in outdoor telecom base station equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS installed differentially across A/B bus lines to suppress common-mode and differential-mode transients. Use Value: Withstands 400 W surges per line while maintaining <1.5 pF junction capacitance - avoids signal distortion at up to 10 Mbps. |
Use Scenario: Shielding USB 2.0 D+/D− lines in smart home hubs against human-body-model ESD events during plug/unplug cycles. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed across differential pair to divert ±15 kV ESD pulses to ground. Use Value: Delivers sub-45 V clamping at 5 A ESD current, ensuring USB PHY remains operational without data corruption or disconnect events. |
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/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free designation (E3 vs HM3). | Acceptable for commercial/industrial use where halogen-free material is not mandated by OEM spec. | Select when halogen-free requirement is absent and cost optimization is prioritized. |
| SMBJ26CAHM3/I | Same VWM, VBR, and VC, but SMB (DO-214AA) package - 27% larger footprint and higher thermal resistance (RθJA = 110 °C/W vs 120 °C/W). | Better suited for high-reliability layouts requiring greater creepage/clearance or manual rework accessibility. | Choose when board space allows larger package and enhanced surge margin (600 W PPPM) is needed. |
Compared with SMAJ26CAHM3/I, SMAJ26CAHE3/I offers identical protection performance without halogen-free compliance, while SMBJ26CAHM3/I trades compact size for higher surge capacity and easier handling - making each suitable for distinct mechanical and regulatory constraints.
Availability
SMAJ26CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom surge protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ26CAHM3/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, efficiency, and application-specific validation.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and communications systems where precise clamping, AEC-Q101 compliance, and surface-mount manufacturability are essential.
FAQ
What is the clamping voltage of SMAJ26CAHM3/I at its rated peak pulse current?
The SMAJ26CAHM3/I clamps to a maximum of 42.1 V at its rated peak pulse current of 9.5 A under the 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88390 and reflects worst-case voltage seen by protected circuitry during standardized surge events - critical for verifying compatibility with downstream 3.3 V or 5 V ICs.
Is SMAJ26CAHM3/I suitable for automotive applications?
Yes, SMAJ26CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting requirements for under-hood and chassis-mounted automotive electronics. Its 150 °C TJmax, MSL Level 1 rating, and validated surge performance make it appropriate for engine control, body control modules, and ADAS sensor protection.
How does the bidirectional configuration of SMAJ26CAHM3/I affect its PCB layout?
The SMAJ26CAHM3/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies layout for AC-coupled lines, differential buses (e.g., CAN, RS-485), or any path where voltage polarity may reverse - reducing assembly errors and enabling symmetric routing without cathode/anode alignment checks.
What is the standoff voltage (VWM) of SMAJ26CAHM3/I, and why is it important?
The SMAJ26CAHM3/I has a standoff voltage (VWM) of 26 V, meaning it remains non-conductive below this DC or RMS voltage level. This parameter ensures normal circuit operation without leakage or power loss, while providing sufficient margin above typical 24 V nominal systems - preventing false triggering during benign voltage fluctuations or ripple.
Does SMAJ26CAHM3/I require a heatsink for standard operation?
No, SMAJ26CAHM3/I is designed for surface-mount operation on standard PCB copper pads (0.2" × 0.2" per terminal) and does not require an external heatsink for its rated 400 W pulse power. Its RθJA of 120 °C/W assumes that pad layout per Vishay's recommended footprint - adding heatsinking provides marginal benefit unless operating near thermal limits under repetitive surges.
SMAJ26CAHM3/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:
- 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/I FAQ
1.How can I place an order for SMAJ26CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CAHM3/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/I reliable?
The price and inventory of SMAJ26CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ26CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CAHM3/I?
SMAJ26CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CAHM3/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/I?
For technical support, including SMAJ26CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CAHM3/I requirements.
6.How does Aetrix verify that SMAJ26CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ26CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ26CAHM3/I?
All SMAJ26CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ26CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26CAHM3/I 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 …
