My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ45AH
- Part No.:
- SMBJ45AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,477
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ45AH from Taiwan Semiconductor is a unidirectional 45 V stand-off transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600 W peak pulse power, 72.7 V maximum clamping voltage at 8.6 A peak current, and <1 μA leakage above 45 V - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SMBJ45AH datasheet, SMBJ45AH pinout, SMBJ45AH application, or SMBJ45AH equivalent, key selection criteria include its AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 10/1000 µs waveform clamping performance, and unidirectional polarity with cathode band marking.
Technical Context
The SMBJ45AH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 50.0–55.3 V breakdown range at 1 mA test current. Its glass-passivated junction ensures stable VBR and low leakage (<1 µA at 45 V), while thermal resistance of 55 °C/W (junction-to-ambient) supports sustained operation up to 150 °C junction temperature.
It delivers 72.7 V clamping voltage under 8.6 A 10/1000 µs surge current, with sub-1 ps response time and meets JESD201 Class 2 whisker resistance. The device is not bidirectional - no CH/CAH suffix - and requires correct cathode orientation in PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before conduction begins; defines safe working rail margin. |
| VBR min/max | 50.0 / 55.3 V @ 1 mA - verified avalanche onset range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPP | 72.7 V @ 8.6 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient overvoltage exposure. |
| PPK | 600 W - non-repetitive peak pulse power handling; enables robust protection against ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA - ultra-low reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering. |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive deployment without derating below 125 °C ambient. |
| RθJA | 55 °C/W - thermal resistance from junction to ambient; informs heatsinking requirements for repeated surge events. |
Pinout & Package
DO-214AA (SMB) surface-mount package: molded plastic case with matte tin-plated leads, cathode band marking on one end, polarity-critical for unidirectional operation. Weight: 0.090 g. Moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; must be routed with minimal inductance for effective clamping. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 45 V rail); cathode band identifies this terminal on PCB and component body. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test conditions including temperature cycling, HTRB, and ESD - enables use in engine control, body modules, and ADAS power rails. |
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift over 15+ year service life, critical for safety-critical vehicle systems. |
| ISO 7637-2 compliant | Passes Pulse 1 (inductive spike), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) - covers full automotive electrical disturbance profile. |
| Sub-1 ps response time | Clamps within picoseconds of overvoltage onset - protects fast CMOS inputs and microcontroller I/O pins before damage occurs. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental requirements for global automotive OEM sourcing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 45 V battery-fed control module subjected to load dump transients up to 120 V in 12 V/48 V hybrid architectures. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and DC-DC converter input to clamp surges before regulator stage. Use Value: Limits transient voltage to ≤72.7 V, preventing overvoltage failure of downstream 80 V-rated buck controller and enabling single-stage protection without additional Zener stages. |
Use Scenario: 24 V industrial PLC analog input channel exposed to field wiring ESD and inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on signal line, paired with series resistor and filter capacitor. Use Value: Clamps 4 kV contact ESD (IEC 61000-4-2) to <73 V in <1 ps, preserving ADC accuracy and avoiding latch-up in precision op-amps. |
| LED Driver Overvoltage Clamp | Automotive CAN Transceiver Protection |
Use Scenario: Constant-current LED driver for exterior lighting experiencing alternator-induced spikes during engine cranking. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb energy from inductive flyback and battery reversal transients. Use Value: Withstands 600 W peak pulses and maintains <1 µA leakage at 45 V, eliminating standby current penalty while ensuring lamp circuit reliability. |
Use Scenario: CAN FD physical layer transceiver in gateway ECU exposed to coupled noise from high-power motor drives. IC Role / Device Role / Timing Role: Secondary-level protection on CAN_H/CAN_L lines, downstream of common-mode choke and upstream of transceiver ESD diodes. Use Value: Provides differential-mode surge suppression with 72.7 V clamping, maintaining CAN bus integrity during ISO 7637-2 Pulse 2b events without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ45A | Same DO-214AC (SMA) package, 45 V VWM, but lower PPK = 400 W and higher VC = 73.0 V @ 5.5 A; RθJA = 65 °C/W. | Lower surge rating limits suitability for ISO 7637-2 Pulse 5a; acceptable for non-load-dump consumer or industrial use. | Select SMAJ45A only if board space allows SMA footprint and system surge energy is ≤400 W. |
| ON Semiconductor SMCJ45A | DO-214AB (SMC) package, same 45 V VWM, PPK = 1500 W, VC = 72.7 V @ 20.7 A; larger footprint and higher thermal mass. | Higher surge capacity supports repeated load dump events; requires 2.5× PCB area vs. SMBJ45AH. | Choose SMCJ45A where multi-pulse robustness is required and board real estate permits larger SMC outline. |
Compared with SMAJ45A, SMBJ45AH offers 50% higher peak power (600 W vs. 400 W) in a smaller SMB package, while matching clamping voltage; versus SMCJ45A, it trades surge headroom (1500 W) for compactness and cost - making SMBJ45AH optimal for space-constrained AEC-Q101 automotive modules needing precise 45 V rail protection.
Availability
SMBJ45AH is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, LED driver circuits, and CAN bus protection requiring stable component supply with AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMBJ45AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs - headquartered in Hsinchu Science Park, Taiwan.
The SMBJH series was developed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 immunity, and tight parametric distribution across temperature for under-hood power rail protection.
FAQ
What is the breakdown voltage range of SMBJ45AH?
The SMBJ45AH has a minimum breakdown voltage (VBR) of 50.0 V and a maximum of 55.3 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures reliable, repeatable avalanche conduction onset across manufacturing lots and temperature extremes, directly supporting its role in protecting 45 V nominal systems against overvoltage events.
Is SMBJ45AH bidirectional or unidirectional?
SMBJ45AH is a unidirectional TVS diode, indicated by the absence of "CH" or "CAH" suffix and confirmed by its single cathode band marking. It conducts only during reverse-biased overvoltage events and blocks forward current like a standard rectifier - making it unsuitable for AC line or bipolar signal protection without external circuitry.
Does SMBJ45AH meet automotive qualification standards?
Yes, SMBJ45AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its glass-passivated junction, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1 rating confirm suitability for automotive powertrain, chassis, and body electronics applications per OEM specifications.
What is the maximum clamping voltage for SMBJ45AH under surge conditions?
The SMBJ45AH clamps to a maximum of 72.7 V when subjected to an 8.6 A peak current with a 10/1000 µs waveform. This value is guaranteed across temperature and process variation, defining the upper voltage limit seen by downstream components during transient events - critical for selecting compatible ICs with appropriate absolute maximum ratings.
Can SMBJ45AH replace SMBJ45H in existing designs?
Yes, SMBJ45AH can replace SMBJ45H in most cases: both share identical DO-214AA (SMB) package, 45 V VWM, and 600 W PPK rating. However, SMBJ45AH has tighter VBR (50.0–55.3 V vs. 50.0–61.1 V) and lower VC (72.7 V vs. 80.3 V), offering improved clamping consistency and lower let-through voltage - beneficial for sensitive 45 V rail protection.
SMBJ45AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ45AH FAQ
1.How can I place an order for SMBJ45AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AH 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 SMBJ45AH reliable?
The price and inventory of SMBJ45AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45AH is usually 5 days.
3.What payment methods are accepted for SMBJ45AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AH?
SMBJ45AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AH 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 SMBJ45AH?
For technical support, including SMBJ45AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AH requirements.
6.How does Aetrix verify that SMBJ45AH is sourced from the original manufacturer or authorized distributors?
All SMBJ45AH 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 SMBJ45AH meets industry standards.
7.What is the process for return or replacement of SMBJ45AH?
All SMBJ45AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AH, 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 SMBJ45AH part is unused and in its original packaging.
Return procedure for SMBJ45AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AH 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
