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Taiwan Semiconductor Corporation 1SMB5948H
- Part No.:
- 1SMB5948H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5948H.pdf
- Description:
- DIODE ZENER 91V 3W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,261
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Product details
Overview
1SMB5948H from Taiwan Semiconductor is a surface-mount silicon Zener diode rated for 3 W power dissipation, with a nominal Zener voltage of 91 V (min 86.45 V, max 95.55 V) at 4.1 mA test current, designed for precision voltage regulation and overvoltage protection in automotive and industrial circuits.
For engineers reviewing the 1SMB5948H datasheet, 1SMB5948H pinout, 1SMB5948H application, or 1SMB5948H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AA (SMB) package, 3000 Ω dynamic impedance at 200 μA, 69.2 V maximum DC Zener current rating, and -55°C to +150°C operating junction temperature range.
Technical Context
The 1SMB5948H operates as a single-die, glass-passivated Zener diode optimized for stable reference and clamping functions under transient and steady-state conditions. Its 3 W total power dissipation at TL = 75°C (derated at 40 mW/°C above 75°C) and 550 mW at TA = 25°C (derated at 4.4 mW/°C above 25°C) define thermal boundary conditions for PCB layout.
It exhibits a Zener impedance of 3000 Ω at 200 μA (ZZK), leakage current ≤0.25 μA at 69.2 V (VR), and a temperature coefficient curve typical for high-voltage Zeners - enabling predictable drift compensation in reference designs across its -55°C to +150°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 86.45–95.55 V at IZT = 4.1 mA - defines tight 5% tolerance band for stable reference generation |
| Power Dissipation (PTOT) | 3 W at lead temperature TL = 75°C - requires minimum 5 mm × 5 mm Cu pad for thermal compliance |
| Zener Impedance (ZZK) | 3000 Ω at IZK = 200 μA - indicates high-impedance knee behavior suitable for low-current biasing |
| Leakage Current (IR) | ≤0.25 μA at VR = 69.2 V - ensures minimal standby power loss in high-impedance sensing nodes |
| Junction Temperature (TJ) | -55°C to +150°C - supports operation in under-hood automotive and industrial control environments |
| Package | DO-214AA (SMB) - surface-mount outline with cathode band polarity marking and RoHS/halogen-free compliance |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band, weight ≈0.100 g, UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower-potential rail during Zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 91 V reference when reverse-biased; marked by visible band on body |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enables long-term stability and reduced parameter drift under thermal stress and humidity exposure |
| Low inductance construction | Supports fast transient response in surge protection circuits without resonant overshoot |
| Moisture sensitivity level 1 (J-STD-020) | Allows unlimited floor life before reflow - no baking required prior to assembly |
| Matte tin-plated leads | Ensures reliable solderability per J-STD-002 and eliminates whisker growth risk (JESD 201 Class 2) |
| AEC-Q101 qualification | Validates robustness for automotive applications including engine control units and ADAS power rails |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Providing stable 91 V reference for ADC biasing and sensor excitation in high-temperature ECU modules. IC Role / Device Role / Timing Role: Precision voltage reference and overvoltage clamp for microcontroller analog front-end. Use Value: Maintains ±5% regulation across -40°C to +125°C ambient with <0.25 μA leakage at 69.2 V, minimizing sensor offset error. | Use Scenario: Protecting 24 V/48 V industrial I/O channels against induced transients from relay switching and motor drives. IC Role / Device Role / Timing Role: Transient voltage suppressor (TVS) in parallel with input conditioning circuitry. Use Value: Clamps surges up to 3 kW (non-repetitive, 10/1000 μs) while maintaining <3000 Ω dynamic impedance below 200 μA. |
| Telecom Power Supply Overvoltage Clamp | Medical Imaging HV Bias Reference |
Use Scenario: Safeguarding isolated DC-DC converter outputs in telecom base station power supplies against line surges. IC Role / Device Role / Timing Role: Secondary-side Zener clamp limiting output voltage excursion during fault conditions. Use Value: Delivers 3 W steady-state dissipation capability with 25°C/W junction-to-lead thermal resistance for compact heatsinking. | Use Scenario: Generating calibrated high-voltage bias for photomultiplier tube (PMT) anode chains in diagnostic imaging systems. IC Role / Device Role / Timing Role: Precision Zener reference in ultra-low-drift, low-noise HV supply feedback loop. Use Value: Achieves <0.25 μA leakage at 69.2 V and 5% VZ tolerance - critical for sub-0.1% gain stability in analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF91A (ON Semiconductor) | Same DO-214AA package, 91 V nominal, but rated 1 W only; lower ZZK (2000 Ω) at 1 mA | Not suitable for 3 W continuous dissipation; limited to low-power reference or light-clamp roles | Select only if thermal budget restricts to ≤1 W and tighter ZZ at higher IZ is prioritized |
| BZX84-C91 (Diodes Inc.) | SOT-23 package, 91 V nominal, 300 mW rating; ZZ = 1200 Ω at 5 mA | Cannot handle automotive-level surge energy or industrial thermal loads; unsuitable for AEC-Q101 environments | Use only in space-constrained consumer electronics where 300 mW derating suffices and qualification is not required |
Compared with SMF91A and BZX84-C91, the 1SMB5948H uniquely delivers 3 W power handling in an AEC-Q101-qualified SMB package - making it the only option among the three capable of sustained 91 V regulation in under-hood automotive and high-reliability industrial power rails.
Availability
1SMB5948H is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1SMB5948H 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, analog ICs, and automotive-qualified components.
The 1SMB59xxH series is part of TSC's AEC-Q101-qualified Zener diode portfolio, engineered specifically for high-reliability voltage regulation and transient suppression in harsh-environment automotive and industrial systems.
FAQ
What is the Zener voltage tolerance of the 1SMB5948H?
The 1SMB5948H has a ±5% Zener voltage tolerance, with a nominal value of 91 V and specified range of 86.45 V (min) to 95.55 V (max) at 4.1 mA test current. This tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version A2102), and applies across the full operating temperature range.
Is the 1SMB5948H suitable for automotive applications?
Yes, the 1SMB5948H is AEC-Q101 qualified - explicitly stated in the FEATURES section of the datasheet. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per JESD22 standards, making it approved for use in engine control units, body electronics, and ADAS power domains.
What is the maximum DC Zener current rating for the 1SMB5948H?
The maximum DC Zener current (IZM) for the 1SMB5948H is 16 mA, corresponding to the 69.2 V voltage point (VR) in the Electrical Specifications table. This value reflects the highest continuous current the device can sustain while remaining within its 3 W power limit and thermal boundaries.
Does the 1SMB5948H have halogen-free and RoHS compliance?
Yes, the 1SMB5948H is both RoHS compliant and halogen-free per IEC 61249-2-21, as documented in the FEATURES section. The molding compound and plating materials meet these environmental standards without compromising thermal or electrical performance.
What is the thermal resistance from junction to ambient for the 1SMB5948H?
The junction-to-ambient thermal resistance (RθJA) for the 1SMB5948H is 226°C/W under standard JEDEC test conditions (single device on FR-4 board, no copper pour). This value assumes zero airflow and defines the worst-case thermal rise for layout planning - actual performance improves significantly with 5 mm × 5 mm Cu pads (RθJL = 25°C/W).
1SMB5948H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 69.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1SMB5948H FAQ
1.How can I place an order for 1SMB5948H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5948H 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 1SMB5948H reliable?
The price and inventory of 1SMB5948H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5948H is usually 5 days.
3.What payment methods are accepted for 1SMB5948H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5948H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5948H?
1SMB5948H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5948H 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 1SMB5948H?
For technical support, including 1SMB5948H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5948H requirements.
6.How does Aetrix verify that 1SMB5948H is sourced from the original manufacturer or authorized distributors?
All 1SMB5948H 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 1SMB5948H meets industry standards.
7.What is the process for return or replacement of 1SMB5948H?
All 1SMB5948H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5948H, 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 1SMB5948H part is unused and in its original packaging.
Return procedure for 1SMB5948H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5948H Tags
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MM5Z5V1ST1G
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