My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ20AHM3_B/I
- Part No.:
- SMBJ20AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHM3_B/I.pdf
- Description:
- 600W,20V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,641
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ20AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 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 18.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ20AHM3_B/I datasheet, SMBJ20AHM3_B/I pinout, SMBJ20AHM3_B/I application, or SMBJ20AHM3_B/I equivalent, this page delivers verified electrical specs, thermal behavior under surge conditions, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world protection use cases - all confirmed from Vishay's official SMBJ5.0A–SMBJ188A datasheet (Rev. 09-Jan-2024, Doc. #88392).
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for low leakage (<1.0 µA at VWM) and fast response time (<1.0 ns). Its 100 °C/W junction-to-ambient thermal resistance (RθJA) and 20 °C/W junction-to-lead (RθJL) define thermal limits under repetitive surge duty cycles.
The SMBJ20AHM3_B/I is rated for -55 °C to +150 °C operating junction temperature, supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed minimum/maximum reverse breakdown range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for downstream component survivability. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - Sustained transient energy absorption capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - Ultra-low standby leakage preserves system efficiency and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and industrial ambient environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance reference; completes clamping loop during transient events. |
| Cathode | Protected line connection / Clamping node | Connected to the line being protected (e.g., 24 V rail or sensor input); conducts when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics; supports extended temperature and lifetime requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates without compromising surge robustness or thermal performance. |
| 600 W peak pulse power (10/1000 µs) | Handles high-energy transients common in industrial motor drives and power supply inputs without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic within safe operating area during surge. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorning or delamination risks. |
Applications
| Industrial Motor Drive Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Suppresses inductive kickback from 24 V solenoid drivers and relay coils in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping transients before they reach gate drivers or microcontrollers. Use Value: Limits voltage excursion to ≤32.4 V during 18.5 A surges, preventing latch-up or oxide damage in downstream SiC MOSFET gate drivers. |
Use Scenario: Protects LIN bus transceivers and LED driver ICs from load dump and jump-start surges in door module PCBs. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V power input rail, activated only during >22.2 V overvoltage events with sub-nanosecond response. Use Value: Maintains <1.0 µA leakage at nominal 12 V, avoiding battery drain while delivering AEC-Q101–validated reliability across -40 °C to +125 °C. |
| Industrial Sensor Signal Line Protection | Telecom Power Supply Input Stage |
|
Use Scenario: Shields analog outputs of pressure and temperature sensors from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <200 pF at 0 V) placed inline on 4–20 mA or 0–10 V output traces. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <32.4 V without distorting DC accuracy or adding measurable signal path impedance. |
Use Scenario: Front-end surge suppression on AC/DC adapter primary-side DC bus feeding telecom base station power management ICs. IC Role / Device Role / Timing Role: Primary-level unidirectional TVS absorbing 600 W surges from lightning-induced coupling on long input cables. Use Value: Withstands 100 A IFSM (8.3 ms) and derates predictably above 25 °C per Fig. 2, enabling stable operation up to +105 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHE3_B/I | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (E3 vs HM3); lacks AEC-Q101 qualification. | Approved for commercial/industrial use only; not certified for automotive under-hood deployment. | Select when halogen-free content or automotive qualification is not required; lower cost alternative with identical clamping behavior. |
| SMAJ20A-M3 | Lower peak pulse power (400 W vs 600 W); same VWM/VBR/VC; SMA (DO-214AC) package with smaller footprint (4.57 mm × 2.79 mm). | Insufficient for IEC 61000-4-5 Level 4; suitable only for lower-energy ESD or board-level surges. | Choose for space-constrained consumer designs where 400 W surge margin suffices and PCB area is critical. |
Compared with SMBJ20AHM3_B/I, the SMBJ20AHE3_B/I offers identical protection performance without halogen-free or automotive qualification, while the SMAJ20A-M3 trades 33 % lower surge capacity and reduced thermal mass for smaller board area - making the SMBJ20AHM3_B/I optimal for high-reliability automotive and industrial applications demanding full 600 W rating and AEC-Q101 validation.
Availability
SMBJ20AHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, sensor interface protection, and telecom power supply inputs requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ20AHM3_B/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where clamping precision, surge endurance, and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMBJ20AHM3_B/I at its rated peak pulse current?
The SMBJ20AHM3_B/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 18.5 A under the standard 10/1000 µs waveform. This value is measured per Vishay's datasheet (Doc. #88392, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20AHM3_B/I maintains this clamping performance across its qualified temperature range.
Is SMBJ20AHM3_B/I qualified for automotive applications?
Yes, SMBJ20AHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and explicit notation in Vishay's ordering information table (page 3, Doc. #88392). This qualification validates its suitability for automotive applications including body electronics, infotainment power rails, and sensor interfaces where extended temperature cycling, humidity resistance, and long-term reliability are required. The SMBJ20AHM3_B/I meets all stress test criteria defined in AEC-Q101 Rev. D.
What does the "HM3" suffix indicate in SMBJ20AHM3_B/I?
The "HM3" suffix in SMBJ20AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free) variants. Per Vishay's mechanical data section, HM3 parts use molding compounds and plating that eliminate brominated flame retardants and chlorine-based materials, satisfying strict environmental mandates without sacrificing surge performance or thermal robustness. The SMBJ20AHM3_B/I fully complies with JEDEC JESD201 Class 2 whisker testing.
How does SMBJ20AHM3_B/I compare to SMBJ20AHE3_B/I in terms of reliability?
SMBJ20AHM3_B/I and SMBJ20AHE3_B/I share identical electrical parameters and SMB package dimensions, but differ in material compliance and qualification: SMBJ20AHM3_B/I is halogen-free and AEC-Q101 qualified, whereas SMBJ20AHE3_B/I is RoHS-compliant only (E3) and lacks automotive qualification. For mission-critical automotive or industrial deployments where long-term material stability and validated stress performance are essential, SMBJ20AHM3_B/I provides higher assurance. Both parts use the same glass-passivated die and meet MSL Level 1.
What is the maximum reverse leakage current for SMBJ20AHM3_B/I at its stand-off voltage?
The maximum reverse leakage current (ID) for SMBJ20AHM3_B/I is 1.0 µA at its 20 V stand-off voltage (VWM), tested at TA = 25 °C per Vishay's electrical characteristics table (page 2, Doc. #88392). This ultra-low leakage ensures minimal power loss in always-on circuits and prevents false triggering in high-impedance sensor bias networks. The SMBJ20AHM3_B/I maintains leakage below 10 µA even at TJ = 125 °C, supporting stable operation in thermally demanding environments.
SMBJ20AHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 18.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ20AHM3_B/I FAQ
1.How can I place an order for SMBJ20AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHM3_B/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 SMBJ20AHM3_B/I reliable?
The price and inventory of SMBJ20AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ20AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHM3_B/I?
SMBJ20AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHM3_B/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 SMBJ20AHM3_B/I?
For technical support, including SMBJ20AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ20AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHM3_B/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 SMBJ20AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ20AHM3_B/I?
All SMBJ20AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHM3_B/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 SMBJ20AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ20AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHM3_B/I 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 …
