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Vishay General Semiconductor - Diodes Division SMAJ75CAHE3/5A
- Part No.:
- SMAJ75CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAHE3/5A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,171
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Product details
Overview
SMAJ75CAHE3/5A 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 SMAJ75CAHE3/5A datasheet, SMAJ75CAHE3/5A pinout, SMAJ75CAHE3/5A application, or SMAJ75CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, 121 V clamping at 3.3 A, AEC-Q101 qualification, RoHS-compliant matte tin terminals, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 75 V), while the low incremental surge resistance enables effective energy diversion without thermal runaway.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above 78 V per Fig. 2 of the datasheet. With a junction-to-ambient thermal resistance of 120 °C/W and operating temperature range of −55 °C to +150 °C, it supports reliable operation in under-hood automotive environments and industrial control cabinets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12–48 V DC systems. |
| VBR (min/max) | 83.3 V / 92.1 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during fast transients. |
| VC @ IPPM | 121 V at 3.3 A - Clamping voltage under 10/1000 μs surge; limits downstream voltage stress to <121 V during ESD or load dump. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling per standard waveform; determines survivability against ISO 7637-2 Pulse 1/2/5a events. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports unidirectional surge tolerance where applicable. |
| TJ max | +150 °C - Maximum junction temperature; enables use in high-ambient environments such as engine control units. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint; compatible with J-STD-020 MSL Level 1 reflow profile (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical junction; accepts reverse surge current during negative transients. |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical junction; accepts reverse surge current during positive transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions-enables single-device protection of AC-coupled or floating signal lines. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-supports use in ADAS and body control modules. |
| Glass passivated junction | Stable VBR tolerance and low leakage (<1 μA at VWM) across temperature-ensures consistent clamping without drift in harsh environments. |
| Low-profile SMT package | SMA (DO-214AC) with 1.98 mm max height-fits space-constrained PCB layouts and supports high-density automated assembly. |
| 400 W peak pulse power | Rated per 10/1000 μs waveform on 0.2" × 0.2" copper pads-meets IEC 61000-4-5 Level 4 surge immunity requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power rails in engine control units against load dump and jump-start surges per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between rail and ground to divert >100 V transients away from downstream regulators and microcontrollers. Use Value: Limits rail voltage to ≤121 V during 3.3 A surge events, preventing latch-up or permanent damage to 3.3 V/5 V logic circuitry. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) in factory automation sensors. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across differential signal pairs or supply-to-ground to absorb ESD and switching noise. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while adding <0.5 pF parasitic capacitance at 0 V bias. |
| Consumer Device USB Port Protection | Telecom Power Supply Input Stage |
|
Use Scenario: Secondary-level protection on USB VBUS lines in portable chargers and docking stations exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated clamp (75 V) placed after primary fuse and upstream of USB PD controller to handle sustained overvoltage. Use Value: Blocks >75 V faults while passing normal 5 V operation; clamps 1 kV ESD (IEC 61000-4-2) to <121 V without degrading data line timing. |
Use Scenario: Front-end surge suppression on −48 V telecom rectifier outputs feeding distributed power architecture boards. IC Role / Device Role / Timing Role: Bidirectional TVS connected between −48 V rail and return to suppress polarity-reversed transients and lightning-induced surges. Use Value: Handles repetitive 300 W surges above 78 V with 150 °C max junction rating-ensures uptime in outdoor cabinet deployments. |
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-E3/5A | No AEC-Q101 qualification; commercial-grade only; same electrical specs and SMA package. | Not suitable for automotive OEM or Tier-1 production; acceptable for industrial or consumer prototyping. | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs. |
| SMBJ75CAHE3/5A | Higher 600 W peak pulse power (10/1000 μs); SMB (DO-214AA) package with larger 5.28 mm × 4.50 mm × 2.29 mm footprint. | Better surge margin for severe environments (e.g., railway traction power); requires PCB layout change due to larger pad area. | Choose when system-level surge testing exceeds 400 W or when higher IPPM (4.3 A) is needed for extended clamping duration. |
Compared with SMAJ75CAHE3/5A, SMAJ75CA-E3/5A offers identical protection performance without automotive qualification, while SMBJ75CAHE3/5A delivers 50 % higher pulse power in a physically larger package-enabling trade-offs between board space, qualification, and surge headroom.
Availability
SMAJ75CAHE3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer USB power delivery systems requiring stable component supply and AEC-Q101 compliance.
Supply support for SMAJ75CAHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in automotive, industrial, and communications infrastructure-designed to meet stringent surge immunity standards while supporting automated manufacturing.
FAQ
What is the clamping voltage of SMAJ75CAHE3/5A at its rated peak pulse current?
The SMAJ75CAHE3/5A has a maximum clamping voltage (VC) of 121 V at 3.3 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured with the device mounted on 0.2" × 0.2" copper pads per the Vishay datasheet Figure 1 test condition. The 121 V clamping level ensures downstream ICs and MOSFETs remain within safe operating voltage margins during surge events. SMAJ75CAHE3/5A maintains this performance bidirectionally.
Is SMAJ75CAHE3/5A suitable for automotive applications?
Yes, SMAJ75CAHE3/5A is AEC-Q101 qualified, making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor modules. Its construction includes glass-passivated junctions, matte tin-plated leads compliant with J-STD-002, and MSL Level 1 moisture sensitivity. The device operates across −55 °C to +150 °C and meets ISO 7637-2 surge requirements when applied per recommended PCB layout. SMAJ75CAHE3/5A is explicitly designated for automotive use via the "HE3" suffix.
How does the bidirectional design of SMAJ75CAHE3/5A affect its circuit implementation?
The bidirectional design of SMAJ75CAHE3/5A means it functions identically for both positive and negative voltage transients-no polarity marking is present on the SMA package, and it can be placed across any two nodes requiring symmetrical overvoltage protection. This eliminates orientation concerns during placement and simplifies layout for AC-coupled lines, differential buses (e.g., RS-485), or floating power domains. SMAJ75CAHE3/5A achieves this via a back-to-back diode structure, delivering matched VBR and VC in both directions.
What is the thermal resistance and power derating behavior of SMAJ75CAHE3/5A?
SMAJ75CAHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. Its peak pulse power derates linearly above 25 °C ambient: at 75 °C, rated PPPM drops to ~300 W for devices above 78 V VWM, per Figure 2 in the Vishay datasheet. Continuous power dissipation (PD) remains 3.3 W at 50 °C on infinite heatsink. SMAJ75CAHE3/5A must be mounted on minimum recommended copper pads to achieve published ratings.
Does SMAJ75CAHE3/5A have a specified junction capacitance?
No, the Vishay datasheet for SMAJ75CAHE3/5A does not specify junction capacitance (CJ) for this particular variant. While Figure 4 provides typical CJ curves for the SMAJ family (e.g., ~100 pF at 0 V for SMAJ70A), no discrete value is tabulated for SMAJ75CAHE3/5A. For high-speed signal line protection where capacitance matters (e.g., USB 2.0), designers should verify layout parasitics and consider lower-capacitance alternatives if CJ < 50 pF is required. SMAJ75CAHE3/5A is optimized for power rail and low-frequency analog protection.
SMAJ75CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ75CAHE3/5A FAQ
1.How can I place an order for SMAJ75CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAHE3/5A 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 SMAJ75CAHE3/5A reliable?
The price and inventory of SMAJ75CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ75CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAHE3/5A?
SMAJ75CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAHE3/5A 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 SMAJ75CAHE3/5A?
For technical support, including SMAJ75CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ75CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAHE3/5A 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 SMAJ75CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ75CAHE3/5A?
All SMAJ75CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAHE3/5A, 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 SMAJ75CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ75CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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