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Taiwan Semiconductor Corporation SMBJ51CH
- Part No.:
- SMBJ51CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CH.pdf
- Description:
- 600W, 63V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:5,452
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Product details
Overview
SMBJ51CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 51 V working stand-off voltage (VWM), 91.1 V maximum clamping voltage (VC@IPP) at 6.9 A peak impulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ51CH datasheet, SMBJ51CH pinout, SMBJ51CH application, or SMBJ51CH equivalent, this device is selected for robust ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, and low leakage (<1 µA above 10 V) in 12 V/24 V vehicle subsystems and industrial I/O interfaces.
Technical Context
The SMBJ51CH is a unidirectional/bidirectional TVS diode configured as a single die in a glass-passivated junction structure. Its clamping behavior follows IEEE C62.35 standards, with thermal resistance RθJC = 10 °C/W and RθJA = 55 °C/W enabling reliable operation up to TJ = 150 °C.
It supports both unidirectional and bidirectional configurations via CH (bidirectional) or H (unidirectional) suffixes. The SMBJ51CH specifically uses the CH suffix, confirming symmetrical breakdown (VBR min/max = 56.7/69.3 V) and identical electrical characteristics in both directions per datasheet Section "Devices for Bipolar Applications".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 48 V systems. |
| VBR @ IT = 1 mA | 56.7–69.3 V - Verified breakdown threshold ensures predictable turn-on during transients without premature conduction. |
| VC @ IPP = 6.9 A | 91.1 V - Clamped voltage under 10/1000 µs surge limits downstream IC stress to <92 V in 48 V bus protection. |
| PPK | 600 W - Peak pulse power handling enables suppression of ISO 7637-2 Pulse 5a (load dump) surges without failure. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on automotive modules. |
| TJ max | +150 °C - Junction temperature rating supports under-hood deployment without derating in engine control units. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means no functional anode/cathode distinction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Identical clamping in both directions; connects across protected line and ground (or between differential lines) without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, critical for under-hood longevity. |
| Sub-1 ps response time | Clamps ESD events faster than most microcontrollers can respond, preventing latch-up or gate oxide damage in connected ICs. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing and end-of-life processing. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 48 V battery management system (BMS) communication lines from load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN FD or LIN bus lines and chassis ground to clamp transients before they reach transceiver inputs. Use Value: Limits clamped voltage to 91.1 V, staying well below 100 V absolute maximum ratings of ISO 11898-2/3 transceivers while surviving 600 W pulses. |
Use Scenario: Shielding 24 V digital input channels on programmable logic controllers from inductive kickback of solenoid valves. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt energy from relay coil flyback into ground plane before reaching optocoupler or MCU GPIO. Use Value: Sub-1 ps response ensures clamping occurs before 100 ns edge rates of fast-switching loads cause latch-up in isolation circuitry. |
| LED Lighting Driver Surge Suppression | Medical Equipment ESD Interface Protection |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems exposed to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Placed across primary-side bulk capacitor terminals to absorb 10/1000 µs line-to-ground transients before rectifier bridge or controller IC. Use Value: 600 W peak power rating handles IEC 61000-4-5 Level 4 (4 kV) surges without thermal runaway, validated per UL 94V-0 flammability. |
Use Scenario: Protecting USB and RS-232 ports on diagnostic imaging equipment from operator ESD events in clinical environments. IC Role / Device Role / Timing Role: Bidirectional TVS installed on each signal line to ground to divert ±8 kV contact discharge per IEC 61000-4-2 without affecting signal integrity. Use Value: <1 µA leakage at 51 V prevents DC offset errors in precision analog front-ends, while symmetrical VBR ensures equal protection for positive/negative ESD strikes. |
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 SMAJ51CA | Same DO-214AC (SMA) package; 51 V VWM, 93.6 V VC@IPP (7.0 A), 400 W PPK - lower power rating and larger package footprint. | Not AEC-Q101 qualified; lacks ISO 7637-2 Pulse 5a validation; suitable only for non-automotive industrial use. | Select when cost sensitivity outweighs automotive qualification and 600 W surge headroom is unnecessary. |
| ON Semiconductor SMCJ51CA | DO-214AB (SMC) package; 51 V VWM, 87.1 V VC@IPP (7.6 A), 1500 W PPK - higher power but 3× larger footprint and 2× higher thermal resistance (RθJA = 120 °C/W). | Supports higher energy surges but requires PCB area reallocation; not optimized for space-constrained automotive ECUs. | Select when protecting against extreme load dump (e.g., heavy-duty truck 28 V systems) where 1500 W headroom justifies larger layout impact. |
Compared with SMBJ51CH, SMAJ51CA offers lower cost but sacrifices automotive qualification and surge margin, while SMCJ51CA delivers greater power handling at the expense of board space and thermal performance-making SMBJ51CH the optimal balance for compact, AEC-Q101-compliant 48 V systems.
Availability
SMBJ51CH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, LED lighting drivers, and medical diagnostic interface modules requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ51CH 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, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed to deliver AEC-Q101-qualified, ISO 7637-2-compliant TVS protection in compact DO-214AA packages for next-generation 48 V mild-hybrid vehicle architectures and ruggedized industrial controls.
FAQ
What does the 'CH' suffix indicate in SMBJ51CH?
The 'CH' suffix in SMBJ51CH denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both forward and reverse directions. Per the datasheet's "Devices for Bipolar Applications" section, SMBJ51CH exhibits identical breakdown voltage (56.7–69.3 V) and clamping behavior regardless of polarity-critical for protecting differential buses like CAN or RS-485 where voltage reversals occur.
Is SMBJ51CH suitable for 48 V automotive power networks?
Yes, SMBJ51CH is explicitly designed for 48 V systems: its 51 V working stand-off voltage (VWM) provides adequate margin above nominal 48 V rails while remaining below typical 60 V overvoltage thresholds. Its AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and 600 W peak pulse rating make it suitable for protecting ECUs, ADAS sensors, and infotainment power supplies in modern mild-hybrid vehicles.
How does SMBJ51CH compare to unidirectional SMBJ51H in clamping performance?
SMBJ51CH and SMBJ51H share identical clamping voltage (91.1 V @ 6.9 A) and peak power (600 W), but differ in polarity behavior: SMBJ51CH clamps symmetrically in both directions, while SMBJ51H conducts only in reverse (cathode-to-anode). For applications like CAN bus or AC-coupled signals where bidirectional transients occur, SMBJ51CH eliminates the need for dual unidirectional devices or polarity-aware layout.
What is the maximum allowable ambient temperature for SMBJ51CH in continuous operation?
SMBJ51CH has a maximum junction temperature (TJ) of +150 °C and a junction-to-ambient thermal resistance (RθJA) of 55 °C/W. At 3 W steady-state power dissipation (PD), the maximum ambient temperature is calculated as TA = TJ − (PD × RθJA) = 150 − (3 × 55) = −15 °C-confirming it is intended for pulsed, not continuous, power dissipation. Continuous operation relies on low leakage (<1 µA), keeping self-heating negligible up to +125 °C ambient.
Does SMBJ51CH require special PCB layout considerations for optimal ESD protection?
Yes: to preserve its sub-1 ps response, SMBJ51CH must be placed within 2 mm of the protected connector or IC pin with minimal trace inductance. Use wide, short traces (≥15 mil width) directly to ground plane vias-avoid daisy-chaining or shared return paths. The DO-214AA (SMB) package's low inductance and symmetrical terminals simplify layout versus discrete dual-diode solutions, but ground path impedance remains the dominant factor in clamping effectiveness.
SMBJ51CH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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)
SMBJ51CH FAQ
1.How can I place an order for SMBJ51CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CH 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 SMBJ51CH reliable?
The price and inventory of SMBJ51CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CH is usually 5 days.
3.What payment methods are accepted for SMBJ51CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CH?
SMBJ51CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CH 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 SMBJ51CH?
For technical support, including SMBJ51CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CH requirements.
6.How does Aetrix verify that SMBJ51CH is sourced from the original manufacturer or authorized distributors?
All SMBJ51CH 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 SMBJ51CH meets industry standards.
7.What is the process for return or replacement of SMBJ51CH?
All SMBJ51CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CH, 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 SMBJ51CH part is unused and in its original packaging.
Return procedure for SMBJ51CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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