My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ120AHE3/61
- Part No.:
- SMAJ120AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120AHE3/61.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,455
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ120AHE3/61 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 (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive ECUs.
For engineers reviewing the SMAJ120AHE3/61 datasheet, SMAJ120AHE3/61 pinout, SMAJ120AHE3/61 application, or SMAJ120AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HE3 suffix), 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 conditions it presents high impedance (>1 MΩ leakage at 120 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
The device complies with ANSI/IEEE C62.35 surge standards and delivers consistent clamping performance across -55 °C to +150 °C operating range. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling effective heat dissipation in compact PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - precise voltage threshold where avalanche conduction begins; tight 10.5% tolerance enables predictable protection onset |
| VC (Clamping Voltage) | 193 V at IPPM = 1.6 A - maximum voltage seen by protected circuit during 10/1000 μs surge; determines residual stress on downstream components |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capability for standard lightning/surge waveforms; derates to 300 W above 78 V per spec |
| ID (Reverse Leakage) | 1.0 μA at 120 V - ultra-low leakage preserves system efficiency and prevents false triggering in high-impedance circuits |
| TJ max. | +150 °C - supports operation in under-hood automotive and industrial environments without thermal shutdown |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A108 |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in standard layouts |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow at 260 °C peak without moisture-related popcorning or delamination |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive logic |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
|
Use Scenario: Protecting microcontroller GPIO and CAN transceiver power rails from load-dump spikes and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between 12 V supply rail and chassis ground. Use Value: Limits transient voltage to ≤193 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic powered from buck-regulated 12 V bus. |
Use Scenario: Safeguarding 24 V DC digital input circuits against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Front-end protection element mounted directly at terminal block entry point. Use Value: Clamps 1 kV/500 A surge (per IEC 61000-4-4) to <200 V within nanoseconds, preserving optocoupler isolation integrity and input comparator accuracy. |
| Telecom Power Supply Output Stage | Consumer Appliance Motor Drive Board |
|
Use Scenario: Secondary-side overvoltage suppression on +48 V telecom rectifier outputs exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor bank to absorb residual transients after primary-stage MOV filtering. Use Value: Withstands 400 W pulses without degradation, maintaining output regulation stability and avoiding false OVP shutdowns during surge events. |
Use Scenario: Protecting gate drivers and MCU reset lines from commutation noise generated by BLDC motor windings. IC Role / Device Role / Timing Role: Localized clamping on 5 V auxiliary supply feeding motor controller logic. Use Value: Sub-200 V clamping voltage ensures reset IC remains functional during 100 ns–1 μs switching transients, eliminating spurious reboots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/61 | Commercial-grade version; same electrical specs but not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial power supplies only | Select when AEC-Q101 is not required and cost sensitivity is higher |
| SMCJ120AHE3/61 | Same VWM/VBR/VC but in larger SMC (DO-214AB) package; 1500 W PPPM rating | Higher power handling requires larger PCB footprint; better for >100 A surge currents | Choose when system-level surge tests exceed 400 W or layout allows SMC footprint |
Compared with SMAJ120AHE3/61, the E3/61 variant trades automotive qualification for lower cost in non-automotive systems, while the SMCJ120AHE3/61 offers 3.75× higher surge capacity at the expense of board space - making SMAJ120AHE3/61 optimal for space-constrained AEC-Q101-compliant designs needing precise 400 W clamping.
Availability
SMAJ120AHE3/61 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input stages, telecom power supply outputs, and consumer appliance motor drive boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ120AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, 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 compliance, and robust SMT manufacturability in the SMA footprint.
FAQ
What is the clamping voltage of SMAJ120AHE3/61 at its rated peak pulse current?
The SMAJ120AHE3/61 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 ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ120AHE3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ120AHE3/61 suitable for automotive applications?
Yes, SMAJ120AHE3/61 is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its part number and Vishay's official documentation. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per JESD22-A108. The SMAJ120AHE3/61 is deployed in engine control units, body control modules, and ADAS sensor interfaces where automotive-grade reliability is mandatory.
What is the thermal resistance of SMAJ120AHE3/61, and how does it affect PCB layout?
The SMAJ120AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. These values assume mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under worst-case 3.3 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks - the SMAJ120AHE3/61 is not intended for continuous power dissipation.
How does the unidirectional configuration of SMAJ120AHE3/61 impact circuit design?
The SMAJ120AHE3/61 is unidirectional, meaning it conducts only in reverse bias - the banded end is cathode and must be connected toward the protected line, while the anode connects to ground or reference. This configuration blocks forward current, making it ideal for DC power rail protection. Unlike bidirectional variants (e.g., SMAJ120CA), SMAJ120AHE3/61 cannot suppress AC-coupled transients or bipolar signals without additional circuitry.
What packaging and reel options are available for SMAJ120AHE3/61?
SMAJ120AHE3/61 is supplied in 7" diameter plastic tape and reel format with a base quantity of 1800 units per reel (package code /61). The device uses RoHS-compliant matte tin-plated leads and meets JESD201 Class 2 whisker resistance. Tape-and-reel packaging supports high-speed automated placement, and the /61 designation confirms compatibility with standard SMT feeders used in automotive and industrial manufacturing lines.
SMAJ120AHE3/61 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)
SMAJ120AHE3/61 FAQ
1.How can I place an order for SMAJ120AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120AHE3/61 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 SMAJ120AHE3/61 reliable?
The price and inventory of SMAJ120AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ120AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120AHE3/61?
SMAJ120AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120AHE3/61 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 SMAJ120AHE3/61?
For technical support, including SMAJ120AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120AHE3/61 requirements.
6.How does Aetrix verify that SMAJ120AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ120AHE3/61 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 SMAJ120AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ120AHE3/61?
All SMAJ120AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120AHE3/61, 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 SMAJ120AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ120AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120AHE3/61 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
