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Vishay General Semiconductor - Diodes Division SMA5J26AHM3/I
- Part No.:
- SMA5J26AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J26AHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
SMA5J26AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 26 V standoff voltage (VWM), 28.9–31.9 V breakdown range (VBR), 42.1 V clamping voltage at 11.9 A peak pulse current (IPPM), and 500 W peak pulse power (10/1000 µs waveform). It is halogen-free, RoHS-compliant, and AEC-Q101 qualified - used to protect automotive sensor interfaces and industrial power rails against inductive switching transients.
For engineers reviewing the SMA5J26AHM3/I datasheet, SMA5J26AHM3/I pinout, SMA5J26AHM3/I application, or SMA5J26AHM3/I equivalent, key selection criteria include its 26 V working voltage, 42.1 V clamping performance under 11.9 A surge, AEC-Q101 qualification status, SMA package thermal resistance (RθJA = 80 °C/W), and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the SMA package supports automated placement and meets MSL level 1 (260 °C reflow peak).
It is rated for non-repetitive 10/1000 µs surges up to 500 W, with derating above 25 °C per Fig. 2. Junction temperature range is –55 °C to +150 °C, and it sustains 40 A single half-sine forward surge (8.3 ms), making it suitable for 12 V/24 V automotive power rail protection where fast response and low incremental surge resistance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 24 V nominal systems. |
| VBR (min/max) | 28.9 V / 31.9 V - Breakdown occurs within this range at 1 mA test current; defines turn-on consistency across production lots. |
| VC @ IPPM | 42.1 V - Clamping voltage at 11.9 A peak pulse current; determines maximum voltage seen by protected IC during surge. |
| PPPM | 500 W - Peak pulse power handling (10/1000 µs waveform); enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients. |
| IPPM | 11.9 A - Peak pulse current corresponding to VC; used with PCB trace impedance to calculate actual clamping margin. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments with minimal derating. |
| RθJA | 80 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs thermal design for sustained surge duty cycles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by a band on the body; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (non-banded end) | Connected to lower-potential side (e.g., ground or return path); completes conduction path during forward surge or ESD events. |
| Cathode | Reverse-biased clamping terminal (banded end) | Connected to protected line (e.g., 24 V rail); avalanche conduction occurs here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor modules per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets automotive and industrial environmental compliance mandates without compromising surge performance or thermal reliability. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump), improving protection margin for sensitive MOSFETs and microcontrollers. |
| MSL Level 1 (260 °C) | Enables standard SMT reflow without pre-baking; compatible with high-volume automated assembly lines. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime and temperature, critical for long-term reliability in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control modules against ISO 7637-2 load dump pulses (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Shunt clamping device placed between rail and ground, responding in <1 ns to limit voltage excursion to ≤42.1 V. Use Value: Prevents latch-up or permanent damage to MCU power inputs and CAN transceivers during alternator field decay events. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode tied to signal line) clamps negative transients induced by inductive switching. Use Value: Maintains signal integrity below ADC input damage threshold (typically ±30 V) while adding <0.5 pF capacitance at 0 V bias. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Securing 48 V PoE-powered equipment front-end against lightning-induced surges on Ethernet cable pairs. IC Role / Device Role / Timing Role: Primary shunt protector upstream of DC-DC converter, absorbing energy before it reaches isolation transformers. Use Value: Withstands 500 W peak pulse without degradation, enabling compliance with IEC 61000-4-5 Level 4 (4 kV line-earth). |
Use Scenario: Shielding microcontroller GPIOs and gate drivers in smart washing machine motor control boards from brush-commutator noise. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC, clamping spikes generated during PWM commutation. Use Value: Limits voltage to 42.1 V at 11.9 A, preventing false triggering of overvoltage lockout and extending MOSFET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J26AHE3/I | Same electrical specs and package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); no halogen-free assurance. | Approved for industrial/commercial use only; not certified for automotive under-hood deployment. | Select when AEC-Q101 is not required and cost sensitivity outweighs halogen-free mandate. |
| SMCJ26A | Higher power rating (1500 W), larger SMC (DO-214AB) package, same VWM/VC values; RθJA = 35 °C/W vs. 80 °C/W. | Better thermal performance and surge capacity; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 500 W or ambient temperatures exceed 105 °C. |
Compared with SMA5J26AHM3/I, SMA5J26AHE3/I offers identical clamping and standoff but lacks automotive qualification and halogen-free status, while SMCJ26A provides higher surge margin at the cost of board space and thermal design complexity - making SMA5J26AHM3/I optimal for space-constrained, AEC-Q101–mandated 24 V automotive nodes.
Availability
SMA5J26AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supplies requiring stable component supply with guaranteed halogen-free and AEC-Q101–compliant sourcing.
Supply support for SMA5J26AHM3/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, and protection devices with emphasis on reliability, power density, and automotive-grade validation.
The SMA5J series was engineered specifically for high-power-density transient suppression in space-constrained automotive and industrial applications, balancing clamping performance, thermal efficiency, and manufacturability in standard SMT packages.
FAQ
What is the clamping voltage of the SMA5J26AHM3/I and how is it measured?
The SMA5J26AHM3/I has a maximum clamping voltage (VC) of 42.1 V, measured at its specified peak pulse current (IPPM) of 11.9 A using a 10/1000 µs waveform. This value represents the highest voltage that appears across the SMA5J26AHM3/I terminals during a standardized surge event, directly determining the protection level delivered to downstream components.
Is the SMA5J26AHM3/I suitable for automotive applications?
Yes, the SMA5J26AHM3/I is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HM3" indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is validated for under-hood environments with operating junction temperatures up to +150 °C and meets requirements for engine control, body electronics, and ADAS sensor protection.
How does the SMA5J26AHM3/I differ from the SMA5J26A-E3/61?
The SMA5J26AHM3/I shares identical electrical specifications (VWM = 26 V, VC = 42.1 V) with SMA5J26A-E3/61 but adds halogen-free material content and AEC-Q101 qualification. The "HM3" suffix confirms compliance with automotive environmental and reliability standards, whereas "E3" denotes commercial-grade RoHS-only compliance without automotive validation.
What is the thermal resistance of the SMA5J26AHM3/I and why does it matter?
The SMA5J26AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" copper pads. This value determines how much the junction temperature rises per watt of dissipated surge energy - critical for predicting safe operating margins during repetitive transients or elevated ambient conditions in automotive and industrial deployments.
Does the SMA5J26AHM3/I have polarity markings, and how is it installed?
Yes, the SMA5J26AHM3/I is unidirectional and marked with a cathode band on the body. During installation, the banded end must be connected to the line being protected (e.g., 24 V rail), and the unmarked (anode) end to ground. Reversing polarity prevents proper clamping and may lead to device failure under overvoltage conditions.
SMA5J26AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 11.9A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J26AHM3/I FAQ
1.How can I place an order for SMA5J26AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J26AHM3/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 SMA5J26AHM3/I reliable?
The price and inventory of SMA5J26AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J26AHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J26AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J26AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J26AHM3/I?
SMA5J26AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J26AHM3/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 SMA5J26AHM3/I?
For technical support, including SMA5J26AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J26AHM3/I requirements.
6.How does Aetrix verify that SMA5J26AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J26AHM3/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 SMA5J26AHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J26AHM3/I?
All SMA5J26AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J26AHM3/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 SMA5J26AHM3/I part is unused and in its original packaging.
Return procedure for SMA5J26AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J26AHM3/I Tags
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