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Taiwan Semiconductor Corporation SMBJ85H
- Part No.:
- SMBJ85H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85H.pdf
- Description:
- 600W, 104.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:7,567
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Product details
Overview
SMBJ85H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 85 V working stand-off voltage (VWM), 94.4–115 V breakdown voltage (VBR), 151 V maximum clamping voltage (VC) at 4.1 A peak pulse current (IPP), and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive lighting control modules and powertrain sensor interfaces.
For engineers reviewing the SMBJ85H datasheet, SMBJ85H pinout, SMBJ85H application, or SMBJ85H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, unidirectional polarity marking, and thermal derating behavior above 25°C ambient.
Technical Context
The SMBJ85H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with low leakage (<1 µA at 85 V). Its clamping action begins at VBR min = 94.4 V (tested at 1 mA), limiting induced surges to ≤151 V at 4.1 A (10/1000 µs waveform).
Thermally, it supports junction temperatures from –55°C to +150°C, with RθJC = 10°C/W and RθJA = 55°C/W. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - enabling reflow-compatible automated placement without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before significant leakage; defines system bus voltage compatibility |
| VBR (min/max) | 94.4 V / 115 V @ 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots |
| VC @ IPP | 151 V @ 4.1 A (10/1000 µs) - peak clamped voltage seen by protected IC; determines downstream voltage stress margin |
| PPK | 600 W - non-repetitive surge energy handling capacity; validates compliance with ISO 7637-2 Pulse 3b (50 Ω source) |
| ID @ VWM | ≤1 µA - ultra-low blocking leakage at rated stand-off; preserves battery-powered circuit standby current budgets |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline; compatible with IPC-7351B footprint and pick-and-place tooling |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on the anode-side end. Matte tin-plated leads meet J-STD-002 solderability; polarity is unidirectional only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., CAN_H, LIN, or 12 V rail); conducts during overvoltage events |
| Anode (unmarked end) | Reference/ground return path | Connected to system ground or low-impedance return plane; completes clamping loop during transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports PPAP documentation and Tier-1 supply chain acceptance |
| Glass passivated junction | Enables stable VBR tolerance and low IR drift over temperature and lifetime - critical for long-term reliability in harsh environments |
| ISO 7637-2 compliance | Tested against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full vehicle-level EMC immunity |
| Moisture sensitivity level 1 | No floor life limitation or baking required prior to reflow - reduces manufacturing overhead and avoids moisture-induced popcorning |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - satisfies environmental compliance for global OEM programs |
Applications
| Automotive Lighting Control | Powertrain Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp modules from load-dump transients during battery disconnect/reconnect events. IC Role / Device Role: Primary clamping device placed between 12 V supply rail and ground, upstream of DC-DC converters and linear regulators. Use Value: Limits voltage excursion to ≤151 V during 10/1000 µs pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices. |
Use Scenario: Shielding crankshaft/camshaft position sensor signal lines from coupled noise during ignition coil switching. IC Role / Device Role: Bidirectional-capable protection (via SMBJ85AH variant) or unidirectional clamp on sensor VCC or output lines. Use Value: Sub-1 ps response ensures clamping activation before sensitive analog front-end amplifiers saturate or misread timing edges. |
| Body Control Module (BCM) Power Input | Infotainment USB/UART Lines |
Use Scenario: Guarding 5 V/3.3 V power rails in BCMs against jump-start surges and alternator ripple spikes. IC Role / Device Role: Standoff-rated TVS placed directly at power entry point, before bulk capacitance and LDO inputs. Use Value: 85 V VWM allows safe operation across full 12 V automotive range (9–16 V nominal), while 600 W PPK handles worst-case ISO 7637-2 Pulse 1. |
Use Scenario: ESD protection for USB 2.0 D+/D− and UART TX/RX traces exposed to user-accessible connectors in center-stack displays. IC Role / Device Role: Low-capacitance (CJ ≈ 100 pF at 0 V) unidirectional clamp referenced to local ground plane. Use Value: Clamps ±8 kV contact discharge (IEC 61000-4-2) without signal integrity degradation due to minimal parasitic loading. |
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 SMAJ85A | Same DO-214AC (SMA) package; 85 V VWM, 151 V VC @ 4.1 A; AEC-Q101 qualified; slightly higher RθJA (60°C/W) | Compatible in space-constrained layouts where SMA footprint is preferred; lower thermal efficiency in high-power density designs | Select when existing PCB uses SMA pads or when sourcing diversification is required without layout change |
| ON Semiconductor SMCJ85A | DO-214AB (SMC) package; 85 V VWM, 151 V VC @ 4.1 A; AEC-Q101 qualified; 1500 W PPK rating (larger die) | Higher surge margin but requires larger board area; better suited for engine bay applications with extreme thermal cycling | Choose for enhanced robustness in under-hood locations where 600 W may be marginal; verify pad layout compatibility |
Compared with SMBJ85H, SMAJ85A offers identical electrical specs in a smaller SMA package but reduced thermal dissipation, while SMCJ85A delivers higher surge capacity in a larger SMC outline - requiring trade-offs between board space, thermal management, and failure-mode margin.
Availability
SMBJ85H is available at Aetrix Electronics and suitable for automotive lighting control, powertrain sensor interface, and body control module applications requiring stable component supply, AEC-Q101 traceability, and ISO 7637-2 compliance.
Supply support for SMBJ85H 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive systems - emphasizing low leakage, tight VBR tolerance, and robust surge endurance under thermal stress.
FAQ
What is the polarity configuration of SMBJ85H?
The SMBJ85H is a unidirectional TVS diode, with cathode indicated by a band on the package. It conducts only during reverse-biased overvoltage events - meaning it must be installed with the banded end toward the protected line and anode toward ground. This configuration ensures proper clamping of positive transients on supply rails or signal lines referenced to ground. SMBJ85H does not provide bidirectional protection; for symmetric surge suppression, the SMBJ85AH variant is specified.
Does SMBJ85H meet automotive EMC standards beyond AEC-Q101?
Yes, SMBJ85H is validated per ISO 7637-2 for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for full vehicle-level EMC compliance testing. Its 600 W peak pulse power rating and 151 V clamping voltage at 4.1 A directly satisfy the energy thresholds defined in those pulses. The device's glass-passivated junction and low leakage also support long-term stability under repeated transient stress - a requirement not covered by AEC-Q101 alone.
What is the maximum allowable junction temperature for SMBJ85H during surge events?
The SMBJ85H has a maximum junction temperature (TJ) rating of +150°C, and its thermal resistance values - RθJC = 10°C/W and RθJA = 55°C/W - allow accurate estimation of junction heating during transient events. Under worst-case 600 W surge conditions, even brief 10/1000 µs pulses result in negligible average power, but repetitive surges require thermal derating per Figure 2 in the datasheet. Operation above 150°C risks irreversible parametric shift or bond-wire failure.
How does SMBJ85H compare to SMBJ85AH in terms of clamping performance?
SMBJ85H and SMBJ85AH share identical VWM (85 V) and VC (151 V @ 4.1 A), but differ in breakdown voltage range: SMBJ85H specifies VBR = 94.4–115 V, while SMBJ85AH tightens this to 94.4–104 V. This narrower VBR window improves consistency in turn-on timing across units, beneficial in precision clamping applications. SMBJ85AH is also rated for bidirectional use (with CH/CAH suffix convention), whereas SMBJ85H is strictly unidirectional - a critical distinction for differential line protection.
Is SMBJ85H compatible with lead-free reflow soldering processes?
Yes, SMBJ85H is fully compatible with standard lead-free reflow profiles (per J-STD-020). Its matte tin-plated leads meet J-STD-002 solderability requirements, and its MSL Level 1 rating means no floor life limitation or pre-baking is required. The device withstands peak reflow temperatures up to 260°C for up to 60 seconds, supporting common Pb-free SAC305 and SN100C alloy processes without delamination or parameter shift - verified across multiple production lots by Taiwan Semiconductor.
SMBJ85H 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 151V
- Current - Peak Pulse (10/1000µs):
- 4.1A
- 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)
SMBJ85H FAQ
1.How can I place an order for SMBJ85H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85H 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 SMBJ85H reliable?
The price and inventory of SMBJ85H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85H is usually 5 days.
3.What payment methods are accepted for SMBJ85H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85H?
SMBJ85H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85H 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 SMBJ85H?
For technical support, including SMBJ85H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85H requirements.
6.How does Aetrix verify that SMBJ85H is sourced from the original manufacturer or authorized distributors?
All SMBJ85H 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 SMBJ85H meets industry standards.
7.What is the process for return or replacement of SMBJ85H?
All SMBJ85H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85H, 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 SMBJ85H part is unused and in its original packaging.
Return procedure for SMBJ85H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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