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Vishay General Semiconductor - Diodes Division SMAJ120AHE3/5A
- Part No.:
- SMAJ120AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120AHE3/5A.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,586
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Product details
Overview
SMAJ120AHE3/5A 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 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 V maximum clamping voltage (VC) at 1.6 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMAJ120AHE3/5A datasheet, SMAJ120AHE3/5A pinout, SMAJ120AHE3/5A application, or SMAJ120AHE3/5A equivalent, this device is evaluated for ESD and surge protection in AEC-Q101-compliant automotive subsystems, DC power input stages, and high-voltage analog signal conditioning circuits where low-leakage (<1.0 μA at VWM) and fast response (<1 ns) are critical.
Technical Context
This unidirectional TVS operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance, enabling consistent clamping performance across repetitive transients. The device is rated for 40 A non-repetitive forward surge current (IFSM) and supports operation from –55 °C to +150 °C junction temperature.
Thermal design relies on its RθJA of 120 °C/W (on minimum pad layout) and RθJL of 30 °C/W, making it suitable for PCB layouts with localized copper thermal relief. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification - required for under-hood automotive modules and engine control unit (ECU) power inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V–48 V systems. |
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - Tight 5 % tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 193 V at 1.6 A - Clamping voltage during 10/1000 μs surge; limits downstream IC stress to <200 V in 120 V nominal lines. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; derates to 300 W above 78 V per spec. |
| ID @ VWM | <1.0 μA - Ultra-low reverse leakage preserves battery life in always-on automotive modules. |
| TJ max. | +150 °C - Enables placement near heat sources (e.g., power MOSFETs) without derating concerns. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD footprint compatible with automated pick-and-place and reflow profiles up to 260 °C. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-band marked end. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest-potential rail; forms return path during clamping event. |
| Cathode | High-side transient input | Connected to protected line (e.g., 12 V supply); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock - required for ECU, body control, and ADAS power domains. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and IEC 61000-4-5 Combination Wave surges up to Level 4 without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during fast transients - critical for safeguarding 150 V-rated MOSFETs and gate drivers. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required prior to assembly. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal stress and humidity exposure - essential for 15-year automotive service life. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery feed to engine control unit (ECU) exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive-going transients above 133 V while blocking reverse leakage below 120 V. Use Value: Limits peak voltage to ≤193 V during 100 V/10 ms load dump events, preventing damage to 16 V-input LDOs and microcontrollers. |
Use Scenario: 24 V analog output line from pressure sensor in factory automation PLC module. IC Role / Device Role / Timing Role: Fast-acting clamping element placed directly at connector entry point to shunt induced lightning-induced surges. Use Value: Sub-1 ns response time and 1.0 μA leakage preserve signal integrity and minimize offset error in 16-bit ADC front-ends. |
| DC-DC Converter Input Stage | Telecom Power Supply Rail Protection |
Use Scenario: 48 V input to isolated buck converter powering base station RF amplifiers. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and switching FET. Use Value: 40 A IFSM rating withstands repeated hot-swap insertion surges; 150 °C TJ max enables placement near magnetics. |
Use Scenario: -48 V telecom power distribution board subjected to IEC 61000-4-5 surge testing. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMAJ120AHE3/5A used in unidirectional configuration on positive rail only. Use Value: 193 V clamping voltage ensures downstream DC-DC controllers remain within absolute maximum ratings during 2 kV combination wave tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Not approved for automotive safety-critical modules; acceptable for industrial or consumer power supplies. | Select when AEC-Q101 is not mandated and cost optimization is prioritized. |
| SMAJ120AHM3/5A | Halogen-free, RoHS-compliant, AEC-Q101 qualified; same VWM, VBR, VC, and PPPM. | Required for automotive programs with halogen-free material declarations (e.g., VW 80101). | Choose when halogen-free compliance is specified in OEM material requirements. |
Compared with SMAJ120AHE3/5A, the E3/5A variant lacks automotive qualification but offers identical surge performance at lower cost, while HM3/5A adds halogen-free construction without sacrificing clamping behavior - enabling precise alignment with tier-1 automotive material specifications and industrial green procurement policies.
Availability
SMAJ120AHE3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, and telecom power supply rails requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ120AHE3/5A 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, precision, and automotive-grade validation.
The SMAJ series was engineered for robust transient suppression in harsh environments - targeting automotive power systems, industrial controls, and telecom infrastructure where failure modes must be mitigated without compromising signal fidelity or thermal resilience.
FAQ
What is the clamping voltage of SMAJ120AHE3/5A at its rated peak pulse current?
The SMAJ120AHE3/5A has a maximum clamping voltage (VC) of 193 V at 1.6 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that downstream circuitry sees no more than 193 V during surge events - critical for protecting 200 V-rated components. The SMAJ120AHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ120AHE3/5A suitable for bidirectional transient protection?
No, SMAJ120AHE3/5A is a unidirectional TVS diode - it conducts only in reverse bias above its breakdown voltage and blocks forward current beyond ~3.5 V. For bidirectional protection, Vishay offers the SMAJ120CA variant. Using SMAJ120AHE3/5A in bidirectional applications would leave positive transients on the anode side unprotected. Always verify polarity marking (cathode band) during PCB layout for SMAJ120AHE3/5A.
Does SMAJ120AHE3/5A meet automotive qualification standards?
Yes, SMAJ120AHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3". This certification covers stress tests including high-temperature operating life, temperature cycling, and electrostatic discharge - validating its use in engine compartments, transmission control units, and other automotive zones with ambient temperatures up to +125 °C and junction temperatures to +150 °C. The SMAJ120AHE3/5A data sheet explicitly references AEC-Q101 in its mechanical data section.
What is the maximum reverse leakage current for SMAJ120AHE3/5A at its stand-off voltage?
The SMAJ120AHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 120 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss in always-on automotive modules and preserves accuracy in high-impedance sensor bias networks. Leakage remains below 5 μA up to +125 °C, per Vishay's derating curves.
Can SMAJ120AHE3/5A be used in place of SMAJ120A-E3/5A without design changes?
Yes, SMAJ120AHE3/5A is a direct drop-in replacement for SMAJ120A-E3/5A in terms of footprint, pinout, and electrical characteristics - the only difference is AEC-Q101 qualification and associated process controls. No PCB layout or schematic modifications are needed. However, SMAJ120AHE3/5A provides enhanced reliability assurance for automotive applications where ECU-level qualification is mandatory. Both share identical SMA (DO-214AC) packaging and thermal behavior.
SMAJ120AHE3/5A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ120AHE3/5A FAQ
1.How can I place an order for SMAJ120AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120AHE3/5A 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 SMAJ120AHE3/5A reliable?
The price and inventory of SMAJ120AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ120AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120AHE3/5A?
SMAJ120AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120AHE3/5A 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 SMAJ120AHE3/5A?
For technical support, including SMAJ120AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120AHE3/5A requirements.
6.How does Aetrix verify that SMAJ120AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ120AHE3/5A 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 SMAJ120AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ120AHE3/5A?
All SMAJ120AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120AHE3/5A, 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 SMAJ120AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ120AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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