My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ20AHE3/61
- Part No.:
- SMAJ20AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20AHE3/61.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ20AHE3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 12.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ20AHE3/61 datasheet, SMAJ20AHE3/61 pinout, SMAJ20AHE3/61 application, or SMAJ20AHE3/61 equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive, industrial, and telecom systems where AEC-Q101 qualification, low clamping ratio, and fast response time are critical.
Technical Context
The SMAJ20AHE3/61 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance under repetitive transients.
Designed for surface-mount assembly on standard PCB copper pads (0.2" × 0.2"), it delivers thermal resistance of 120 °C/W (junction-to-ambient) and supports operating junction temperatures from –55 °C to +150 °C. The cathode band marking identifies polarity, and the device meets MSL level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse working voltage before significant leakage; defines safe DC operating margin. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 32.4 V at 12.3 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W - Sustains single 10/1000 μs transients without failure; derates to 300 W above 78 V (not applicable here). |
| IPPM (Peak Pulse Current) | 12.3 A - Peak surge current capability at rated clamping voltage; validates protection level for IEC 61000-4-5 Level 3. |
| IR (Reverse Leakage) | 1.0 μA max at 20 V - Ultra-low leakage preserves power rail integrity and minimizes standby loss in battery-powered systems. |
| TJmax | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors requiring reliability under thermal cycling and vibration. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to 1 kV/42 Ω without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage exposure to downstream ICs-critical for 24 V logic interfaces and CAN transceivers. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-induced damage or delamination. |
| Glass passivated junction | Ensures stable electrical parameters across temperature and lifetime, reducing parameter drift in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy to ground during voltage spikes exceeding 24 V nominal. Use Value: Limits rail voltage to ≤32.4 V during 12.3 A surges, preventing latch-up or burnout in PMICs and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory-floor pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing sub-100 ns ESD strikes before reaching precision DAC or op-amp inputs. Use Value: Maintains signal integrity with <1.0 μA leakage at 20 V, avoiding offset errors in high-impedance sensor interfaces. |
| Telecom DC Feeder Protection | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding -48 V DC power feeds in remote radio head (RRH) base stations against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between feed line and DC-DC converter input to clamp transients before regulation stage. Use Value: Withstands 400 W surges while maintaining 20 V standoff-compatible with telecom rectifier output tolerances and redundancy schemes. |
Use Scenario: Adding secondary surge protection on VBUS line of USB-C ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: Secondary clamp after primary polymer PTC, activated only during high-energy events exceeding primary protection threshold. Use Value: Provides 32.4 V clamping ceiling that stays below USB PD 3.0 20 V max, preserving port compliance and connector safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61 | Commercial-grade (non-AEC-Q101), identical electrical specs and package; RoHS-compliant but not automotive-qualified. | Limited to non-automotive industrial or consumer use where qualification is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle assurance. |
| SMAJ20CAHE3/61 | Bidirectional variant: same VWM (20 V), symmetric VBR (22.2–24.5 V), but clamps in both polarities; slightly higher VC (35.5 V). | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where polarity reversal occurs. | Choose only if bidirectional protection is explicitly needed; otherwise, unidirectional SMAJ20AHE3/61 offers tighter clamping. |
Compared with SMAJ20A-E3/61, the SMAJ20AHE3/61 adds AEC-Q101 qualification for automotive deployment, while SMAJ20CAHE3/61 trades clamping performance for polarity-agnostic protection-making SMAJ20AHE3/61 optimal for cost-constrained, high-reliability 24 V DC rail protection.
Availability
SMAJ20AHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer USB-C power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ20AHE3/61 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, power efficiency, and ruggedized packaging.
The SMAJ series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure-prioritizing low clamping voltage, AEC-Q101 qualification, and surface-mount manufacturability.
FAQ
What is the clamping voltage of the SMAJ20AHE3/61 at its rated peak pulse current?
The SMAJ20AHE3/61 has a maximum clamping voltage (VC) of 32.4 V at 12.3 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ20AHE3/61 maintains this clamping performance across its qualified temperature range (–55 °C to +150 °C), making it suitable for under-hood automotive applications.
Is the SMAJ20AHE3/61 AEC-Q101 qualified, and what does that mean for automotive use?
Yes, the SMAJ20AHE3/61 carries AEC-Q101 qualification, verified through stress tests including high-temperature operating life, temperature cycling, and ESD. This certification confirms its suitability for automotive electronic systems such as body control modules, infotainment power supplies, and ADAS sensor interfaces. The SMAJ20AHE3/61 meets the reliability and robustness requirements defined in the AEC-Q101 standard, distinguishing it from commercial-grade variants like SMAJ20A-E3/61.
How does the SMAJ20AHE3/61 differ from the bidirectional SMAJ20CAHE3/61?
The SMAJ20AHE3/61 is unidirectional, with cathode marking and clamping only during reverse-voltage transients, whereas SMAJ20CAHE3/61 is bidirectional and clamps symmetrically in both polarities. Electrically, SMAJ20AHE3/61 achieves a lower clamping voltage (32.4 V vs. 35.5 V) and is optimized for DC rail protection. The SMAJ20AHE3/61 is preferred for 24 V power lines; SMAJ20CAHE3/61 suits AC or floating differential signals like CAN or RS-485 where polarity reversal occurs.
What is the maximum reverse leakage current of the SMAJ20AHE3/61 at its stand-off voltage?
The SMAJ20AHE3/61 exhibits a maximum reverse leakage current (IR) of 1.0 μA at its 20 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss and avoids interference with high-impedance monitoring circuits or battery-backed systems. The SMAJ20AHE3/61 maintains leakage below 5 μA even at elevated temperatures up to +125 °C, supporting stable operation in thermally demanding environments.
Can the SMAJ20AHE3/61 be used in lead-free reflow processes?
Yes, the SMAJ20AHE3/61 is rated for MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, fully compatible with standard lead-free soldering profiles. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements, and the device passes whisker testing per JESD 201 Class 2. The SMAJ20AHE3/61 requires no pre-baking and can be placed directly into reflow ovens using standard 7" tape-and-reel (61 package code) format.
SMAJ20AHE3/61 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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)
SMAJ20AHE3/61 FAQ
1.How can I place an order for SMAJ20AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20AHE3/61 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 SMAJ20AHE3/61 reliable?
The price and inventory of SMAJ20AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20AHE3/61?
SMAJ20AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20AHE3/61 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 SMAJ20AHE3/61?
For technical support, including SMAJ20AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20AHE3/61 requirements.
6.How does Aetrix verify that SMAJ20AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20AHE3/61 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 SMAJ20AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20AHE3/61?
All SMAJ20AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20AHE3/61, 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 SMAJ20AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ20AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20AHE3/61 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 …
