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STMicroelectronics LDP01-56AY
- Part No.:
- LDP01-56AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LDP01-56AY.pdf
- Description:
- TVS DIODE 48VWM 76VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:834
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Product details
Overview
LDP01-56AY from STMicroelectronics is an automotive-grade transient voltage suppression (TVS) diode designed for load-dump protection in 12 V and 24 V vehicle electrical systems. It features a 56 V nominal breakdown voltage (VBR = 53.3–58.9 V at IR = 1 mA), clamps to ≤90 V at 48 A (8/20 µs), delivers 770 W peak pulse power at Tj = 25 °C, and operates up to 175 °C junction temperature - enabling robust protection of power supply rails in engine control units and body control modules.
For engineers reviewing the LDP01-56AY datasheet, LDP01-56AY pinout, LDP01-56AY application, or LDP01-56AY equivalent, key selection criteria include its ISO 7637-2 Pulse 5a/5b and ISO 16750-2 Test A/B compliance, low 1 µA leakage at 25 °C, D²PAK package thermal resistance (Rth(j-c) = 0.24 °C/W), and verified clamping performance under high-energy load-dump transients.
Technical Context
The LDP01-56AY is a unidirectional planar silicon avalanche diode optimized for high-energy automotive load-dump suppression. Its design targets ISO 7637-2 Pulse 5a (VS = –150 V) and Pulse 5b (VS = +112 V), as well as ISO 16750-2 Tests A (Us up to 90 V) and B (Us* up to 87 V), with clamping voltage tightly controlled via dynamic impedance (RD = 40 mΩ at 8/20 µs).
It leverages ST's Transil™ technology to achieve stable breakdown characteristics across –55 °C to +175 °C, with temperature coefficient αT = +10.3 × 10–4/°C ensuring predictable VBR and VCL drift over temperature - critical for long-term reliability in under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 53.3–58.9 V at IR = 1 mA - defines minimum surge threshold before conduction begins |
| Clamping Voltage (VCL) | ≤90 V at IPP = 48 A (8/20 µs) - limits downstream circuit stress during worst-case load dump |
| Peak Pulse Power (PPP) | 770 W at Tj = 25 °C - supports sustained energy absorption without thermal runaway |
| Leakage Current (IR) | ≤1 µA at VRM = 48 V and 25 °C - ensures minimal standby power loss in always-on systems |
| Junction Temperature Range | –55 °C to +175 °C - enables direct mounting on high-temperature PCBs near power stages |
| Dynamic Impedance (RD) | 40 mΩ (8/20 µs) - determines linearity of clamping response and voltage overshoot margin |
| Temperature Coefficient (αT) | +10.3 × 10–4/°C - quantifies VBR increase per degree above 25 °C for thermal derating |
Pinout & Package
LDP01-56AY is housed in a D²PAK (TO-263AB) surface-mount package with exposed copper thermal pad for enhanced heat dissipation. The package meets JEDEC MO-211 standard, UL 94 V0 flammability rating, and AEC-Q101 qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Surge current entry point | Connected to protected line (e.g., battery rail); must be routed with low-inductance path to ground |
| Cathode (Pin 2) | Surge current return path | Connected to chassis or system ground; forms low-impedance discharge loop with Anode |
| Thermal Pad (Bottom) | Thermal interface | Electrically tied to Cathode; requires solder paste coverage ≥80% for Rth(j-c) = 0.24 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use with 1000-cycle temperature cycling and 1000-hr HTOL at 175 °C |
| ISO 7637-2 Pulse 5a/5b compliant | Withstands –150 V (P5a) and +112 V (P5b) surges with <100 ns response time and no degradation |
| Low dynamic impedance | 40 mΩ enables tighter clamping margin vs. competing TVS devices at 48 A peak current |
| High junction temperature capability | 175 °C max Tj allows placement near DC-DC converters without thermal derating penalties |
| Halogen-free & RoHS-compliant | Meets EU ELV Directive and automotive OEM material declarations (IMDS, MDX) |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
|
Use Scenario: Protects 5 V/3.3 V regulator inputs from alternator load-dump transients during ignition-off events in gasoline/diesel powertrains. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and input capacitor, clamping within 100 ns to prevent regulator latch-up or burnout. Use Value: Enables single-device protection without external series resistor, reducing BOM count while maintaining <90 V clamp at 48 A. |
Use Scenario: Shields LIN bus transceivers and microcontroller I/O from battery-line surges during door lock actuation or lighting load switching. IC Role / Device Role / Timing Role: Front-end protection device on 12 V supply rail upstream of DC-DC converter, operating continuously at 85 °C ambient. Use Value: 1 µA leakage at 48 V ensures <10 µW standby loss - critical for low-power BCM sleep modes. |
| Advanced Driver Assistance Systems (ADAS) Camera ECU | Electric Power Steering (EPS) Motor Driver |
|
Use Scenario: Safeguards image sensor power domain against load-dump spikes induced by HVAC compressor engagement in ADAS camera modules. IC Role / Device Role / Timing Role: Primary surge suppressor on 12 V input, thermally coupled to heatsink via D²PAK thermal pad to sustain 175 °C junction temperature. Use Value: 0.24 °C/W Rth(j-c) allows >300 W sustained power handling at Tj = 150 °C - eliminating need for parallel TVS devices. |
Use Scenario: Protects gate drivers and current-sense amplifiers in EPS motor control boards from reverse-polarity and load-dump events during steering column actuation. IC Role / Device Role / Timing Role: Bidirectional-capable layout (anode grounded) used in negative-going surge suppression per ISO 16750-2 Test B (Us* = +30 V). Use Value: +10.3 × 10–4/°C αT ensures VCL remains ≤95 V even at 175 °C - preserving MOSFET SOA margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive load-dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58A (onsemi) | DO-214AC package, Rth(j-c) = 50 °C/W, PPP = 400 W, VCL = 93.6 V @ 43.2 A | Limited to ambient ≤105 °C due to higher thermal resistance; unsuitable for under-hood placement near power stages | Select when cost sensitivity outweighs thermal performance and board space permits larger footprint |
| SMCJ58A (Littelfuse) | DO-214AB package, Rth(j-c) = 15 °C/W, PPP = 1500 W, VCL = 93.6 V @ 160 A | Higher peak power but 3× larger footprint than D²PAK; lacks AEC-Q101 certification for production automotive use | Prefer for non-automotive industrial 24 V systems requiring higher surge margin without qualification constraints |
Compared with SMAJ58A and SMCJ58A, LDP01-56AY uniquely combines AEC-Q101 qualification, D²PAK thermal efficiency (0.24 °C/W), and precise 56 V standoff - making it the only option qualified for direct integration into production ECU power stages where space, temperature, and compliance are simultaneously constrained.
Availability
LDP01-56AY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for LDP01-56AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and automotive ICs for industrial, automotive, and consumer markets.
LDP01-56AY belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 load-dump compliance in harsh under-hood environments - prioritizing thermal robustness, low leakage, and AEC-Q101 reliability.
FAQ
What is the maximum clamping voltage of LDP01-56AY under ISO 7637-2 Pulse 5a conditions?
The LDP01-56AY clamps to ≤90 V at 48 A (8/20 µs waveform), which corresponds to the worst-case ISO 7637-2 Pulse 5a surge (–150 V, Ri = 0.5 Ω, td = 400 ms). This value is measured per Table 4 and confirmed in Figure 13, ensuring downstream 5 V regulators remain within absolute maximum ratings.
Can LDP01-56AY be used in bidirectional configurations?
No - LDP01-56AY is a unidirectional TVS diode. Its cathode must be connected to system ground and anode to the protected line. For bidirectional protection (e.g., ISO 16750-2 Test B negative surges), a second device or a dedicated bidirectional TVS like SM712 is required.
How does junction temperature affect the breakdown voltage of LDP01-56AY?
VBR increases linearly with junction temperature at +10.3 × 10–4/°C. At 175 °C, VBR rises by 1.55 V above its 25 °C value (56 V → ~57.55 V), directly impacting clamping margin - designers must apply this coefficient when calculating worst-case VCL at elevated Tj.
Is the D²PAK thermal pad electrically isolated?
No - the D²PAK thermal pad is internally connected to the cathode terminal. PCB layout must tie the pad to the same ground net as Pin 2 (cathode) using ≥80% solder coverage to achieve the specified Rth(j-c) = 0.24 °C/W and avoid thermal derating.
LDP01-56AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- LDP01Y, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 76V
- Current - Peak Pulse (10/1000µs):
- 48A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
LDP01-56AY FAQ
1.How can I place an order for LDP01-56AY through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP01-56AY 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 LDP01-56AY reliable?
The price and inventory of LDP01-56AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-56AY is usually 5 days.
3.What payment methods are accepted for LDP01-56AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-56AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP01-56AY?
LDP01-56AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP01-56AY 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 LDP01-56AY?
For technical support, including LDP01-56AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-56AY requirements.
6.How does Aetrix verify that LDP01-56AY is sourced from the original manufacturer or authorized distributors?
All LDP01-56AY 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 LDP01-56AY meets industry standards.
7.What is the process for return or replacement of LDP01-56AY?
All LDP01-56AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-56AY, 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 LDP01-56AY part is unused and in its original packaging.
Return procedure for LDP01-56AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LDP01-56AY Tags
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