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Vishay General Semiconductor - Diodes Division SMAJ75CAHE3_A/I
- Part No.:
- SMAJ75CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAHE3_A/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,783
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Product details
Overview
SMAJ75CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply interfaces.
For engineers reviewing the SMAJ75CAHE3_A/I datasheet, SMAJ75CAHE3_A/I pinout, SMAJ75CAHE3_A/I application, or SMAJ75CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, 121 V clamping at 3.3 A, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This device operates as a voltage-clamped surge protector: under normal conditions it presents high impedance (>1 μA leakage at 75 V), but switches to low-impedance conduction within picoseconds when transients exceed VBR. Its bidirectional symmetry enables protection of AC-coupled or floating signal paths without polarity constraints.
The SMAJ75CAHE3_A/I uses a glass-passivated silicon junction and is rated for 150 °C max junction temperature, with thermal resistance RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W. It meets MSL Level 1 per J-STD-020 and supports peak forward surge current up to 40 A (8.3 ms half-sine) in unidirectional mode - though this spec does not apply to the bidirectional SMAJ75CA variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 83.3 V / 92.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 121 V at 3.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream components. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | 1.0 μA - Reverse leakage at 75 V; negligible loading on 24 V or 48 V DC bus or sensor reference rails. |
| TJ max | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint; compatible with standard reflow profiles and J-STD-002 solderability. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; voltage clamping occurs symmetrically across the device regardless of polarity - no orientation required during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Withstands repetitive transients per ISO 7637-2 without degradation; derates to 300 W above 78 V per datasheet note. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage overshoot during clamping - critical for protecting 75 V-rated gate drivers and CAN FD transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 24 V/48 V power inputs in junction boxes, battery management modules, and lighting control units against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of DC-DC converters and microcontrollers to limit transient voltage to ≤121 V. Use Value: Prevents latch-up or permanent damage to 100 V-rated MOSFETs and LDO regulators during ISO 16750-2 load dump events. |
Use Scenario: ESD and surge protection on analog sensor outputs (e.g., pressure, temperature, current sense) in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp shunting fast transients before they reach ADC front-ends or op-amp buffers. Use Value: Maintains signal integrity by limiting transient-induced offset error and preventing ADC saturation during IEC 61000-4-2 contact discharge. |
| Telecom DC Power Feeds | Consumer Device USB/Type-C Ports |
Use Scenario: Overvoltage protection on -48 V telecom power feeds exposed to lightning-induced surges on outdoor cabinet wiring. IC Role / Device Role / Timing Role: Primary surge suppression stage before secondary TVS arrays and fuse coordination networks. Use Value: Absorbs up to 400 W of energy per event while maintaining <1 μA leakage - avoids unnecessary standby current drain in always-on systems. |
Use Scenario: Secondary-level surge protection on VBUS lines of USB Type-C ports in laptops and docking stations. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp that activates before internal port controller ICs experience overvoltage stress. Use Value: Complements primary protection with sub-nanosecond response and 121 V clamping - prevents damage to USB PD controllers rated for ≤20 V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; unsuitable for under-hood or safety-critical ECUs. | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation. |
| SMBJ75CAHE3_A/I | Same VWM, VBR, and VC; higher 600 W PPPM rating; larger SMB (DO-214AA) package (5.28 mm × 4.57 mm). | Higher surge margin for severe environments; requires larger PCB pad area and different pick-and-place tooling. | Select when system-level surge tests exceed 400 W or when legacy SMB layout is fixed. |
Compared with SMAJ75CA-E3/61, the SMAJ75CAHE3_A/I adds AEC-Q101 qualification and identical RoHS compliance; compared with SMBJ75CAHE3_A/I, it trades 200 W pulse power headroom for smaller footprint and lower parasitic inductance - optimizing for space-constrained automotive modules.
Availability
SMAJ75CAHE3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC feed protection, and consumer USB power line safeguarding requiring stable component supply and full traceability.
Supply support for SMAJ75CAHE3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for surface-mount transient suppression in space-constrained, high-reliability applications - particularly targeting automotive, industrial, and telecom systems needing fast, bidirectional clamping with AEC-Q101 validation.
FAQ
What is the clamping voltage of SMAJ75CAHE3_A/I at its rated peak pulse current?
The SMAJ75CAHE3_A/I has a maximum clamping voltage (VC) of 121 V at 3.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping performance ensures downstream 100 V-rated components remain within safe operating limits during surge events. SMAJ75CAHE3_A/I maintains this specification across its full operating temperature range.
Is SMAJ75CAHE3_A/I suitable for automotive applications?
Yes, SMAJ75CAHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in the Vishay datasheet. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification. Its 150 °C maximum junction temperature, MSL Level 1 rating, and matte tin terminations meet automotive manufacturing and field reliability requirements. SMAJ75CAHE3_A/I is deployed in engine control units, body control modules, and ADAS power supplies where transient immunity is critical.
How does the bidirectional design of SMAJ75CAHE3_A/I affect PCB layout?
The SMAJ75CAHE3_A/I has symmetrical terminals with no cathode marking, eliminating polarity orientation constraints during placement. This simplifies PCB layout by allowing unrestricted rotation and enabling compact, balanced routing on differential or floating signal paths. Unlike unidirectional TVS diodes, SMAJ75CAHE3_A/I avoids risk of incorrect installation and supports AC-coupled interfaces such as RS-485, CAN, or Ethernet PHY protection without additional circuitry. Its DO-214AC footprint remains identical to unidirectional variants.
What is the maximum reverse leakage current for SMAJ75CAHE3_A/I at its standoff voltage?
At its 75 V standoff voltage (VWM), the SMAJ75CAHE3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C, per the Vishay datasheet. This ultra-low leakage ensures minimal power loss in always-on systems and avoids loading precision voltage references or high-impedance sensor nodes. Leakage remains below 5 μA even at 125 °C, supporting stable operation across automotive and industrial temperature ranges. SMAJ75CAHE3_A/I maintains this performance without derating in typical ambient conditions.
Does SMAJ75CAHE3_A/I require special handling or baking before reflow soldering?
No, SMAJ75CAHE3_A/I is rated MSL Level 1 per J-STD-020 and has a maximum peak reflow temperature of 260 °C, making it compatible with standard lead-free reflow profiles without pre-baking. Its moisture sensitivity is negligible due to the robust UL 94 V-0 molding compound and glass passivation. The device supports automated placement and is optimized for high-yield SMT assembly in volume production. SMAJ75CAHE3_A/I's matte tin terminations also comply with J-STD-002 and JESD 22-B102 for solderability assurance.
SMAJ75CAHE3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75CAHE3_A/I FAQ
1.How can I place an order for SMAJ75CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAHE3_A/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 SMAJ75CAHE3_A/I reliable?
The price and inventory of SMAJ75CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ75CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAHE3_A/I?
SMAJ75CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAHE3_A/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 SMAJ75CAHE3_A/I?
For technical support, including SMAJ75CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ75CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAHE3_A/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 SMAJ75CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ75CAHE3_A/I?
All SMAJ75CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAHE3_A/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 SMAJ75CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ75CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CAHE3_A/I Tags
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