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Vishay General Semiconductor - Diodes Division SMAJ48AHM3/H
- Part No.:
- SMAJ48AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AHM3/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,110
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Product details
Overview
SMAJ48AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 5.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ48AHM3/H datasheet, SMAJ48AHM3/H pinout, SMAJ48AHM3/H application, or SMAJ48AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low incremental surge resistance, and verified clamping performance under repetitive 0.01% duty-cycle surges - critical for ESD and load-switching transient protection in safety-critical embedded systems.
Technical Context
This device operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR), thereby shunting transient energy to ground while maintaining low clamping voltage (VC) across protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1 ns), enabling effective suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The SMAJ48AHM3/H is rated for 40 A peak forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and exhibits a temperature coefficient of VBR at +0.103 %/°C - confirming predictable voltage drift over thermal range without requiring external compensation in automotive under-hood designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin for 48 V nominal rails. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 77.4 V at 5.2 A - clamped voltage during 10/1000 μs surge; limits stress on downstream 60 V-rated MOSFETs or LDOs. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2/5a transient immunity in 12 V/24 V automotive systems. |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage at stand-off voltage; avoids parasitic loading on high-impedance sensor bias networks. |
| TJ max. | +150 °C - enables placement near heat sources (e.g., power converters) without derating in engine control units. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design; MSL Level 1 compatible. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; completes clamping loop during transient events. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48 V supply rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and body electronics; supports PPAP documentation and long-term reliability requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental regulations for end-of-life disposal and manufacturing safety; no brominated flame retardants in molding compound. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive switching (e.g., solenoid drivers) without degradation over 100,000+ surge cycles. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during clamping; preserves margin for 60 V-rated components downstream of protection point. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without pre-baking; reduces manufacturing complexity and cost. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load-dump and jump-start transients on 48 V mild-hybrid vehicle battery rails. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps 120 V/100 ms load-dump spikes to ≤77.4 V, preventing damage to 60 V-input buck controllers and gate drivers. |
Use Scenario: Shields analog front-end inputs of current/voltage sensors in motor drives from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage TVS mounted directly at connector entry point, upstream of precision op-amp conditioning circuitry. Use Value: Sub-1 μA leakage at 48 V avoids gain error in 24-bit delta-sigma ADC reference paths; <1 ns response prevents latch-up in CMOS input stages. |
| Telecom DC Power Input Protection | OBD-II Diagnostic Port Protection |
|
Use Scenario: Guards 48 V PoE-powered equipment against surges induced by nearby AC mains switching or lightning coupling. IC Role / Device Role / Timing Role: Primary transient suppressor on DC input before hot-swap controller and primary filter capacitor. Use Value: 400 W rating sustains multiple IEC 61000-4-5 Level 4 (4 kV) surges without parameter shift; DO-214AC footprint allows compact board layout. |
Use Scenario: Protects vehicle diagnostic port (SAE J1962) pins from accidental 12 V/24 V battery connection and ESD during technician probing. IC Role / Device Role / Timing Role: Discrete TVS on each signal line (CAN_H/CAN_L, K-Line) with grounded anode configuration. Use Value: AEC-Q101 qualification ensures operation across –40 °C to +125 °C ambient; HM3 suffix satisfies OEM chemical content reporting requirements. |
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/H | Same electrical specs, but RoHS-compliant with brominated flame retardant (non-halogen-free); not AEC-Q101 qualified. | Limited to commercial-grade automotive modules where halogen-free is not mandated (e.g., infotainment power supplies). | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 validation is unnecessary. |
| SMBJ48A-H | Higher 600 W PPPM rating, SMB (DO-214AA) package; 10% larger footprint and 20% higher RθJA (145 °C/W vs. 120 °C/W). | Better suited for higher-energy transients in industrial PLC backplanes where PCB space permits larger package. | Choose only if surge energy exceeds 400 W capability and thermal budget allows higher junction rise. |
Compared with SMAJ48AHE3/H, the SMAJ48AHM3/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance or footprint; versus SMBJ48A-H, it trades peak power headroom for smaller size and lower thermal resistance - making it optimal for space-constrained, thermally demanding automotive modules.
Availability
SMAJ48AHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC input safeguarding, and OBD-II diagnostic port surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SMAJ48AHM3/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 application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of the SMAJ48AHM3/H under a 10/1000 μs surge?
The SMAJ48AHM3/H has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and guarantees that protected circuitry sees no more than 77.4 V during standardized surge events - critical for ensuring compatibility with 60 V-rated downstream components in 48 V systems.
Is the SMAJ48AHM3/H qualified for automotive use?
Yes, the SMAJ48AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - validating its suitability for under-hood and chassis-mounted applications in passenger vehicles and commercial trucks where reliability under thermal and vibration stress is mandatory.
How does the HM3 suffix differ from the HE3 or E3 suffix in the SMAJ48A family?
The HM3 suffix on SMAJ48AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. In contrast, HE3 is RoHS-compliant and AEC-Q101 qualified but contains brominated flame retardants, while E3 is RoHS-compliant commercial grade without AEC-Q101 validation. The HM3 variant meets stricter chemical content mandates for Tier 1 automotive suppliers and export-controlled markets.
What is the thermal resistance of the SMAJ48AHM3/H, and how does it affect layout design?
The SMAJ48AHM3/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. This value requires minimum recommended pad area to avoid exceeding +150 °C junction temperature during sustained surge duty cycles; designers must allocate adequate copper pour and avoid narrow traces to maintain thermal performance in high-reliability applications.
Can the SMAJ48AHM3/H be used in bidirectional configurations?
No, the SMAJ48AHM3/H is strictly unidirectional, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the CA variant (e.g., SMAJ48CA), which lacks polarity marking and conducts symmetrically in both directions. Using SMAJ48AHM3/H in reverse-biased signal lines without proper DC biasing will result in unintended conduction and system malfunction.
SMAJ48AHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ48AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AHM3/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 SMAJ48AHM3/H reliable?
The price and inventory of SMAJ48AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ48AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AHM3/H?
SMAJ48AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AHM3/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 SMAJ48AHM3/H?
For technical support, including SMAJ48AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AHM3/H requirements.
6.How does Aetrix verify that SMAJ48AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ48AHM3/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 SMAJ48AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ48AHM3/H?
All SMAJ48AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AHM3/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 SMAJ48AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ48AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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