My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ28AHM3_A/H
- Part No.:
- SMBJ28AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,042
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ28AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 13.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMBJ28AHM3_A/H datasheet, SMBJ28AHM3_A/H pinout, SMBJ28AHM3_A/H application, or SMBJ28AHM3_A/H equivalent, key selection considerations include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low thermal resistance (RθJL = 20 °C/W), and unidirectional polarity with cathode band marking - critical for ESD and load-dump transient suppression in safety-critical embedded systems.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 28 V and rapidly transitions to low-impedance conduction above its 31.1–34.4 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), enabling effective suppression of EFT bursts and inductive switching transients.
The SMBJ28AHM3_A/H is rated for 150 °C maximum junction temperature, supports 100 A non-repetitive forward surge current (IFSM), and exhibits a positive temperature coefficient of VBR (+0.098 %/°C), ensuring predictable voltage margin shift across operating temperature ranges in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating DC rail voltage limit. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Ensures reliable triggering above system nominal voltage with margin against tolerance drift. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamped voltage during 10/1000 µs surge; determines protected IC's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capability; validates suitability for ISO 7637-2 Pulse 1 & 2a load-dump events. |
| IFSM | 100 A - Single half-sine surge rating (8.3 ms); supports high-energy inductive turn-off transients in motor drivers. |
| TJ max. | +150 °C - Enables operation in under-hood automotive zones and industrial enclosures without derating. |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance allows efficient heat transfer to PCB copper pads without heatsink. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during overvoltage events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier-1 automotive suppliers and industrial OEMs with strict material restrictions. |
| 600 W peak pulse power (10/1000 µs) | Withstands repetitive ISO 16750-2 load-dump surges up to 35 V for ≥100 ms without degradation. |
| Fast response time & low clamping ratio | Clamps within <1 ns with VC/VBR ≈ 1.42 - minimizes overvoltage exposure to downstream MOSFETs and microcontrollers. |
| Glass passivated junction | Ensures stable leakage (<1 µA at 28 V) and long-term reliability under thermal cycling and humidity bias conditions. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 24 V battery-fed ECUs exposed to ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a/b (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input rail and ground, activated within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤45.4 V, protecting downstream DC-DC converters and CAN transceivers from permanent damage. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to ESD and cable-induced surges. IC Role / Device Role / Timing Role: Standoff-clamp protector on analog input side, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity by limiting excursion to <50 V while adding <1 pF capacitance - no bandwidth degradation. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
|
Use Scenario: -48 V telecom rectifier outputs feeding base station controllers vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus, coordinated with upstream MOVs. Use Value: Provides precise 45.4 V clamping with 600 W rating - enables compact design vs. higher-capacitance alternatives. |
Use Scenario: High-side gate drive circuits in BLDC inverters subjected to Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Localized clamp across gate-source terminals of N-channel MOSFETs to suppress dv/dt overshoot. Use Value: Fast turn-on prevents gate oxide rupture; 20 °C/W RθJL enables direct pad mounting without thermal vias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28AHE3_A/H | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Restricted to commercial-grade industrial or consumer applications where automotive qualification is unnecessary. | Select when cost sensitivity outweighs halogen-free or automotive compliance requirements. |
| SMCJ28A-HM3 | Same VWM/VC, but SMC (DO-214AB) package - larger footprint, higher 1500 W PPPM, RθJL = 15 °C/W. | Better suited for high-energy surges (e.g., railway traction systems) where PCB space permits larger package. | Choose only if system-level surge testing exceeds 600 W and layout allows SMC footprint. |
Compared with SMBJ28AHE3_A/H, the SMBJ28AHM3_A/H adds halogen-free compliance and AEC-Q101 qualification at identical clamping performance; versus SMCJ28A-HM3, it trades 900 W lower surge capacity for 30 % smaller board area and optimized thermal coupling in constrained automotive modules.
Availability
SMBJ28AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feed applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ28AHM3_A/H 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 and automotive-grade validation.
The SMBJ series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, balancing compact SMB packaging with AEC-Q101 qualification and robust 600 W surge handling.
FAQ
What is the clamping voltage of SMBJ28AHM3_A/H at its rated peak pulse current?
The SMBJ28AHM3_A/H has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28AHM3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), making it suitable for under-hood automotive deployment.
Is SMBJ28AHM3_A/H qualified for automotive applications?
Yes, SMBJ28AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88392. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD robustness - validating its use in engine control modules, body control units, and ADAS power supplies. The SMBJ28AHM3_A/H meets all requirements for Grade 1 (−40 °C to +125 °C ambient) and Grade 0 (−40 °C to +150 °C junction) automotive applications.
What does the "HM3" suffix indicate in SMBJ28AHM3_A/H?
The "HM3" suffix in SMBJ28AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from "E3" (RoHS-compliant, commercial grade) and "HE3" (RoHS-compliant + AEC-Q101) variants. HM3 parts meet IEC 61249-2-21 for halogen content (<900 ppm Br, <900 ppm Cl, total halogens <1500 ppm) and are certified for automotive use. This makes SMBJ28AHM3_A/H appropriate for Tier-1 suppliers enforcing strict material declarations.
Can SMBJ28AHM3_A/H be used in bidirectional configurations?
No, SMBJ28AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SMBJ28CA). Using SMBJ28AHM3_A/H in reverse-biased AC applications would result in forward conduction and failure. For bidirectional protection, select SMBJ28CA-HM3 or confirm polarity alignment in DC systems where only positive transients occur - a key design constraint for SMBJ28AHM3_A/H implementation.
What is the thermal resistance from junction to lead (RθJL) for SMBJ28AHM3_A/H?
The SMBJ28AHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, per Vishay datasheet 88392. This low value enables efficient heat transfer from the silicon die directly into the PCB copper pads via the leads, reducing reliance on large thermal vias or external heatsinks. When mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per recommended layout, SMBJ28AHM3_A/H sustains its 5.0 W steady-state power dissipation rating at 50 °C ambient.
SMBJ28AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- 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)
SMBJ28AHM3_A/H FAQ
1.How can I place an order for SMBJ28AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHM3_A/H 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 SMBJ28AHM3_A/H reliable?
The price and inventory of SMBJ28AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ28AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHM3_A/H?
SMBJ28AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHM3_A/H 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 SMBJ28AHM3_A/H?
For technical support, including SMBJ28AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ28AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHM3_A/H 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 SMBJ28AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ28AHM3_A/H?
All SMBJ28AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHM3_A/H, 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 SMBJ28AHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ28AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHM3_A/H 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 …
