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Vishay General Semiconductor - Diodes Division SMAJ75A-E3/5A
- Part No.:
- SMAJ75A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75A-E3/5A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,666
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Product details
Overview
SMAJ75A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection on DC power rails and signal lines. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤121 V at 3.3 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive body control modules to protect 12 V supply inputs against load dump and ISO 7637-2 pulses.
For engineers reviewing the SMAJ75A-E3/5A datasheet, SMAJ75A-E3/5A pinout, SMAJ75A-E3/5A application, or SMAJ75A-E3/5A equivalent, key selection criteria include clamping voltage margin relative to IC absolute maximum ratings, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard SMA (DO-214AC) footprints.
Technical Context
This device operates as a voltage-clamping avalanche diode: under normal bias it presents high impedance (>1 μA leakage at 75 V), but triggers into low-impedance conduction when transient voltage exceeds its VBR threshold. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The SMAJ75A-E3/5A is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C - confirming suitability for lead-free assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse voltage before significant leakage; defines upper limit of protected circuit's normal operating range. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1 mA - Tight tolerance band ensures predictable turn-on across production lots; critical for margining against downstream IC overvoltage limits. |
| VC (Clamping Voltage) | ≤121 V at IPPM = 3.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines whether downstream components remain within safe operating area. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capability for standardized lightning/surge waveforms; derates to 300 W above 78 V per spec. |
| RθJA (Junction-to-Ambient) | 120 °C/W - Thermal resistance under standard 0.2" × 0.2" copper pad layout; used to calculate junction temperature rise under sustained power dissipation. |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Withstands single-event automotive load dump surges without degradation; unidirectional only. |
| Polarity & Marking | Unidirectional with cathode band - Band identifies cathode terminal; essential for correct orientation during PCB layout and automated placement. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); MSL Level 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., GND or return path); defines directionality of clamping action. |
| Cathode (banded end) | Reverse voltage input / Clamping node | Connected to protected line (e.g., 12 V rail); conducts avalanche current to anode when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in automotive and industrial environments without failure; validated per ISO 7637-2 Pulse 5a. |
| Low incremental surge resistance | Minimizes dynamic voltage overshoot during fast-rising transients (<1 ns response), improving clamping precision beyond static VC spec. |
| Glass passivated junction | Ensures stable VBR and leakage performance over temperature and lifetime; eliminates risk of moisture-induced parametric shift. |
| RoHS-compliant, halogen-free option available | E3 suffix denotes commercial-grade RoHS compliance; M3 suffix adds halogen-free certification - meets IPC-1752A material declaration requirements. |
| AEC-Q101 qualification path | HE3/HM3 variants exist; while SMAJ75A-E3/5A itself is commercial grade, its design platform is qualified for automotive under AEC-Q101 - simplifies qualification migration. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protects 12 V microcontroller supply rail in BCM against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, clamping surges before they reach LDO input. Use Value: Limits clamped voltage to ≤121 V, maintaining >10 V margin below typical 130 V automotive LDO absolute max rating. |
Use Scenario: Shields 24 V digital input channel of PLC I/O module from field-wiring induced surges (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: Primary front-end clamp on dry-contact input, placed upstream of series current-limiting resistor and optocoupler. Use Value: Absorbs 400 W surge energy without latch-up, preserving signal integrity and enabling <100 ns response to fast transients. |
| Telecom Power Supply EMI Filter Stage | Consumer Appliance Motor Driver Gate Protection |
|
Use Scenario: Mounted across DC bus of telecom rectifier output to suppress switching noise and lightning-induced spikes. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after bulk capacitor, complementing primary MOV-based protection. Use Value: Provides precise 75 V standoff and low-leakage (<1 μA) operation - avoids unnecessary loading of regulated 48 V output. |
Use Scenario: Protects gate-source terminals of N-channel MOSFETs in BLDC motor driver against Miller-induced voltage spikes during commutation. IC Role / Device Role / Timing Role: Unidirectional TVS tied between gate and source, with cathode to gate, clamping negative-going spikes. Use Value: Fast response and low VC (≤121 V) prevent gate oxide breakdown in 100 V-rated MOSFETs operating near voltage limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-M3/5A | Identical electrical specs; halogen-free, RoHS-compliant variant with same SMA package and matte tin terminations. | No functional difference; selected when halogen-free compliance (per IPC-1752A) is required for final product certification. | Direct drop-in replacement where halogen-free materials are mandated; no layout or test changes needed. |
| SMAJ75AHE3_A/I | Same electrical parameters plus AEC-Q101 qualification; identical SMA package, but with automotive-grade screening and traceability. | Required for automotive OEM designs needing component-level qualification; supports PPAP documentation and extended temperature validation. | Preferred for Tier 1 automotive programs; not recommended for cost-sensitive commercial applications due to premium pricing and longer lead times. |
Compared with SMAJ75A-E3/5A, the M3/5A offers identical protection performance with halogen-free assurance, while the HE3_A/I variant adds automotive qualification - making the E3/5A optimal for high-volume industrial and consumer designs where RoHS compliance suffices without halogen or AEC mandates.
Availability
SMAJ75A-E3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power supplies, and consumer appliance motor controls requiring stable component supply and full traceability.
Supply support for SMAJ75A-E3/5A 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, power efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where repeatable clamping performance and SMT manufacturability are critical.
FAQ
What is the clamping voltage of SMAJ75A-E3/5A at its rated peak pulse current?
The SMAJ75A-E3/5A has a maximum clamping voltage (VC) of 121 V when subjected to its peak pulse current (IPPM) of 3.3 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that protected circuitry will not experience voltages exceeding 121 V during such transient events. The SMAJ75A-E3/5A maintains this clamping performance across its specified operating temperature range.
Is SMAJ75A-E3/5A suitable for automotive applications?
SMAJ75A-E3/5A is a commercial-grade part and is not AEC-Q101 qualified. However, it shares the same die and package design as the AEC-Q101-qualified SMAJ75AHE3_A/I variant. For non-safety-critical automotive subsystems (e.g., infotainment power rails), the SMAJ75A-E3/5A may be used subject to internal qualification - but OEM programs requiring formal automotive certification must specify the HE3 or HM3 suffix versions. The SMAJ75A-E3/5A remains fully compatible with automotive PCB layouts and reflow profiles.
What does the "E3/5A" suffix mean in SMAJ75A-E3/5A?
The "E3" suffix indicates RoHS-compliant, commercial-grade construction with matte tin-plated leads. The "/5A" denotes packaging in 13-inch diameter plastic tape and reel, with a base quantity of 7500 units per reel - optimized for high-speed SMT placement equipment. This differs from "/61", which uses 7-inch reels with 1800 units. The SMAJ75A-E3/5A thus balances environmental compliance, manufacturing efficiency, and logistics scalability.
How does SMAJ75A-E3/5A compare to bidirectional TVS diodes like SMAJ75CA?
The SMAJ75A-E3/5A is unidirectional and features a cathode band for polarity-sensitive placement; it blocks reverse current until breakdown occurs in the forward direction. In contrast, SMAJ75CA is bidirectional and symmetrical - suitable for AC lines or differential signals where polarity reversal is possible. The SMAJ75A-E3/5A offers lower leakage (<1 μA at 75 V) than SMAJ75CA (≤5 μA), making it preferable for DC rail protection where standby power loss matters. Both share identical VBR, VC, and PPPM ratings.
What is the thermal resistance and maximum junction temperature for SMAJ75A-E3/5A?
The SMAJ75A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per Vishay's recommended layout. Its maximum operating junction temperature is +150 °C, with storage temperature spanning –55 °C to +150 °C. These values enable reliable operation in enclosed industrial enclosures or under-hood automotive locations, provided board-level thermal design accounts for power dissipation during surge events.
SMAJ75A-E3/5A 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75A-E3/5A FAQ
1.How can I place an order for SMAJ75A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75A-E3/5A 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 SMAJ75A-E3/5A reliable?
The price and inventory of SMAJ75A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ75A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75A-E3/5A?
SMAJ75A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75A-E3/5A 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 SMAJ75A-E3/5A?
For technical support, including SMAJ75A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75A-E3/5A requirements.
6.How does Aetrix verify that SMAJ75A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ75A-E3/5A 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 SMAJ75A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ75A-E3/5A?
All SMAJ75A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75A-E3/5A, 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 SMAJ75A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ75A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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