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Vishay General Semiconductor - Diodes Division SMAJ48AHM3/I
- Part No.:
- SMAJ48AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AHM3/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
SMAJ48AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 48 V standoff voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤77.4 V at 5.2 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ48AHM3/I datasheet, SMAJ48AHM3/I pinout, SMAJ48AHM3/I application, or SMAJ48AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (≤78 V), low 0.103 %/°C VBR temperature coefficient, and halogen-free RoHS-compliant construction - critical for high-reliability automotive and industrial designs requiring long-term supply stability and thermal robustness.
Technical Context
This unidirectional TVS diode operates as a clamping device across DC power inputs or signal paths, activating when reverse voltage exceeds VBR to divert surge energy away from downstream ICs. Its glass-passivated junction ensures stable leakage (<1.0 μA at 48 V) and fast response time (<1 ns), while the SMA package supports automated SMT placement with MSL Level 1 moisture sensitivity rating.
The device delivers 400 W peak pulse power per 10/1000 μs waveform at TA = 25 °C, derating linearly above 25 °C with RθJA = 120 °C/W. It sustains 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and operates across –55 °C to +150 °C junction temperature range - enabling use in under-hood automotive environments and industrial control cabinets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail protection threshold. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - precise breakdown window ensures reliable activation without premature conduction. |
| VC @ IPPM | ≤77.4 V at 5.2 A - clamping voltage limits stress on protected MOSFETs or microcontrollers during ESD/EFT events. |
| PPPM | 400 W (10/1000 μs) - surge handling capacity sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 transients. |
| IFSM | 40 A - withstands high-energy inductive switch-off surges common in solenoid and relay driver circuits. |
| TJ Range | –55 °C to +150 °C - qualified for under-hood automotive and industrial ambient conditions without derating loss. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design support. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected circuit (e.g., ground or return path). |
| Cathode | Reverse-biased clamping node | Connected to higher-potential line (e.g., 48 V supply); conducts during overvoltage to shunt surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - meets stress test requirements for reliability. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead finish - satisfies EU ELV and customer green procurement mandates. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs transients up to 0.01% duty cycle without degradation - suitable for CAN/LIN bus protection and power supply inputs. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes voltage overshoot during clamping - preserves margin for 5 V or 3.3 V logic interfaces downstream of 48 V systems. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking - reduces manufacturing complexity and cost. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator switching transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 48 V input and chassis ground, activated within <1 ns of overvoltage onset. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤77.4 V, preventing latch-up or gate oxide damage. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface, absorbing ±8 kV contact ESD (IEC 61000-4-2) without signal distortion. Use Value: Maintains signal integrity with <1.0 μA leakage at 48 V, avoiding offset errors in precision current-loop transmitters. |
| Telecom Power Supply Input | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding primary-side rectifier outputs in telecom 48 V distributed power architectures exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor input, clamping transients before they reach PWM controllers. Use Value: Withstands 400 W surges and 40 A IFSM, enabling compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without external fusing. |
Use Scenario: Protecting high-side N-channel MOSFET gate drivers in BLDC motor inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Fast-response TVS connected between gate and source, clamping dv/dt-induced overshoot below MOSFET VGS rating. Use Value: 0.103 %/°C VBR tempco ensures stable clamping threshold across –40 °C to +125 °C operating range - prevents false triggering or under-clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48AHE3/I | Same electrical specs, but RoHS-compliant (non-halogen-free) construction; no halogen-free certification. | Approved for commercial/industrial use where halogen-free requirement is not mandated (e.g., non-automotive consumer equipment). | Select SMAJ48AHE3/I when halogen content is unrestricted and cost optimization is prioritized over automotive green compliance. |
| SMAJ48A-M3/5A | Identical electrical and thermal specs; differs only in packaging format (13" reel, 7500 pcs) and base P/N suffix convention. | No functional difference - same HM3 material specification and AEC-Q101 qualification status as SMAJ48AHM3/I. | Choose SMAJ48A-M3/5A for high-volume production runs requiring larger reels and compatible tape-and-reel logistics. |
Compared with SMAJ48AHM3/I, SMAJ48AHE3/I lacks halogen-free validation but offers identical clamping performance, while SMAJ48A-M3/5A provides identical functionality in a different reel configuration - making the HM3/I variant optimal for AEC-Q101-critical automotive programs requiring full green compliance documentation.
Availability
SMAJ48AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom 48 V power supply surge suppression requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ48AHM3/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, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping, thermal resilience, and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMAJ48AHM3/I at its rated peak pulse current?
The SMAJ48AHM3/I clamps to a maximum of 77.4 V at its specified peak pulse current of 5.2 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream components such as 80 V-rated MOSFETs or 5 V logic interfaces referenced to a 48 V rail. The clamping voltage is confirmed in Vishay's official datasheet revision 09-Jan-2024, Document Number 88390.
Is SMAJ48AHM3/I qualified for automotive applications?
Yes, SMAJ48AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It has passed stress tests including high-temperature operating life, temperature cycling, and ESD immunity required for under-hood and body electronics. This qualification is documented in Vishay's ordering information table and thermal characteristics section of the SMAJ5.0A–SMAJ188CA datasheet.
What does the "HM3" suffix mean in SMAJ48AHM3/I?
The "HM3" suffix in SMAJ48AHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from commercial-grade "E3" or non-automotive "M3" variants. It confirms compliance with JESD201 Class 2 whisker resistance, UL 94 V-0 flammability, and 260 °C lead-free reflow compatibility. This suffix is defined in the Mechanical Data section of Vishay's Document Number 88390.
Can SMAJ48AHM3/I be used in bidirectional protection circuits?
No, SMAJ48AHM3/I is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and explicit designation in the device marking code table. Bidirectional operation requires the "CA" suffix (e.g., SMAJ48CA). Using SMAJ48AHM3/I in bidirectional configurations would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
What is the maximum operating junction temperature for SMAJ48AHM3/I?
The maximum operating junction temperature for SMAJ48AHM3/I is +150 °C, as stated in the Maximum Ratings table of Vishay's datasheet. This rating enables deployment in high-ambient environments such as engine compartments or enclosed industrial drives. Thermal derating begins above 25 °C ambient, with RθJA = 120 °C/W defining the junction-to-ambient thermal resistance under standard PCB mounting conditions.
SMAJ48AHM3/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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ48AHM3/I FAQ
1.How can I place an order for SMAJ48AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AHM3/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 SMAJ48AHM3/I reliable?
The price and inventory of SMAJ48AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ48AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AHM3/I?
SMAJ48AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AHM3/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 SMAJ48AHM3/I?
For technical support, including SMAJ48AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AHM3/I requirements.
6.How does Aetrix verify that SMAJ48AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ48AHM3/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 SMAJ48AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ48AHM3/I?
All SMAJ48AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AHM3/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 SMAJ48AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ48AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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