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Vishay General Semiconductor - Diodes Division SMAJ48AHE3_A/H
- Part No.:
- SMAJ48AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AHE3_A/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ48AHE3_A/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 control systems.
For engineers reviewing the SMAJ48AHE3_A/H datasheet, SMAJ48AHE3_A/H pinout, SMAJ48AHE3_A/H application, or SMAJ48AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (<1 μA leakage at 48 V), then avalanches within picoseconds when transient voltage exceeds VBR to clamp the line at ≤77.4 V. Its glass-passivated junction ensures stable breakdown and repeatable surge performance across temperature.
The device is rated for 40 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and exhibits a +0.103 %/°C temperature coefficient of VBR - enabling predictable clamping behavior over –55 °C to +150 °C operating range. Thermal resistance is 120 °C/W (junction-to-ambient) on standard PCB pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse working voltage before significant leakage begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - guaranteed avalanche initiation window; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 77.4 V at 5.2 A - clamped voltage during 10/1000 μs surge; limits downstream stress to <77.4 V under worst-case 400 W transient. |
| PPPM | 400 W - peak pulse power handling per 10/1000 μs waveform; supports robust protection against inductive switching and ESD events. |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-temperature industrial environments. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms current path during transient clamping in unidirectional configuration. |
| Cathode | High-side protected node | Connected to protected line (e.g., 48 V supply or signal); avalanche conduction occurs from cathode to anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables suppression of high-energy transients from relay coil decay or load dump without degradation over rated duty cycle (0.01 %). |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive electronics including engine control units and body modules requiring zero-failure field reliability. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term surge endurance across thermal cycling and humidity exposure. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without popcorn effect or delamination risk. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during clamping - critical for protecting 50 V-rated MOSFET gates and logic inputs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients up to 120 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 48 V rail and chassis ground. Use Value: Clamps transients to ≤77.4 V within <1 ns, preventing damage to downstream DC-DC controllers and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA loop or 0–10 V analog output line. Use Value: Limits induced surges from nearby motor drives to <77.4 V while maintaining <1 μA leakage for measurement accuracy. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Reverse-polarity TVS mounted on negative rail with cathode tied to -48 V input. Use Value: Withstands repetitive 400 W pulses and maintains stable clamping across -40 °C to +85 °C ambient range. |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed between gate and source. Use Value: Fast response (<1 ns) and low VC prevent gate oxide rupture while adding negligible Miller capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ48AHE3_A/H when automotive qualification, extended temperature validation, or OEM compliance documentation is required. |
| SMCJ48AHE3_A/H | Same VWM/VBR/VC but in larger SMC (DO-214AB) package; 1500 W PPPM rating and lower Rsurge. | Higher power handling and thermal mass; requires larger PCB footprint and different pad layout. | Choose SMAJ48AHE3_A/H for space-constrained 48 V boards needing AEC-Q101; choose SMCJ48AHE3_A/H when higher surge immunity (>400 W) is needed. |
Compared with SMAJ48A-E3/61, SMAJ48AHE3_A/H adds AEC-Q101 qualification and automotive traceability; compared with SMCJ48AHE3_A/H, it trades peak power capability for compact SMA footprint and tighter board integration.
Availability
SMAJ48AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and motor drive gate protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ48AHE3_A/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 high-reliability transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance, AEC-Q101 validation, and robust SMT manufacturability in the SMA package.
FAQ
What is the clamping voltage of the SMAJ48AHE3_A/H under a 10/1000 μs surge?
The SMAJ48AHE3_A/H has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that protected circuitry will not experience more than 77.4 V during such a transient event - critical for safeguarding 50 V-rated components. The SMAJ48AHE3_A/H achieves this with low incremental surge resistance and fast avalanche response.
Is SMAJ48AHE3_A/H suitable for automotive applications?
Yes, SMAJ48AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix, indicating RoHS-compliant construction and full qualification to stress tests including temperature cycling, high-temperature reverse bias, and ESD. It is deployed in engine control units, body electronics, and ADAS power domains where reliability under harsh thermal and electrical conditions is mandatory. The SMAJ48AHE3_A/H meets all requirements for under-hood and chassis-mounted modules.
What is the difference between SMAJ48AHE3_A/H and SMAJ48A-E3/61?
The SMAJ48AHE3_A/H and SMAJ48A-E3/61 share identical electrical parameters (VWM = 48 V, VBR = 53.3–58.9 V, VC = 77.4 V) and SMA package, but differ in qualification: SMAJ48AHE3_A/H is AEC-Q101 qualified and intended for automotive applications, while SMAJ48A-E3/61 is commercial-grade only. Both are RoHS-compliant, but only SMAJ48AHE3_A/H provides automotive traceability, extended reliability testing, and qualification documentation required by Tier 1 suppliers.
Does SMAJ48AHE3_A/H have polarity marking, and how is it oriented in circuit?
Yes, SMAJ48AHE3_A/H is unidirectional and features a visible cathode band on the package body - the banded end is the cathode and must be connected to the protected line (e.g., 48 V rail), while the opposite end (anode) connects to ground or return. This orientation ensures proper avalanche conduction during positive transients. Bidirectional variants (e.g., SMAJ48CA) omit the band; SMAJ48AHE3_A/H's band is essential for correct installation and verified in Vishay's DO-214AC mechanical drawings.
What is the maximum operating temperature and thermal resistance of SMAJ48AHE3_A/H?
The SMAJ48AHE3_A/H has a maximum junction temperature (TJ max) of +150 °C and a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2" × 0.2" copper pad per terminal. This allows operation in high-temperature environments such as automotive engine compartments or industrial enclosures. Derating curves in the datasheet confirm usable power dissipation down to +125 °C ambient with appropriate layout - critical for sustained reliability of SMAJ48AHE3_A/H in thermally demanding applications.
SMAJ48AHE3_A/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:
- Active
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48AHE3_A/H FAQ
1.How can I place an order for SMAJ48AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AHE3_A/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 SMAJ48AHE3_A/H reliable?
The price and inventory of SMAJ48AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ48AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AHE3_A/H?
SMAJ48AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AHE3_A/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 SMAJ48AHE3_A/H?
For technical support, including SMAJ48AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ48AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ48AHE3_A/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 SMAJ48AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ48AHE3_A/H?
All SMAJ48AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AHE3_A/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 SMAJ48AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ48AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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